content: /*
   * Copyright (C) 2006 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package android.view;
  
  import static android.content.res.Resources.ID_NULL;
  import static android.util.StatsLog.TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__DEEP_PRESS;
  import static android.util.StatsLog.TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__LONG_PRESS;
  import static android.util.StatsLog.TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__SINGLE_TAP;
  import static android.util.StatsLog.TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__UNKNOWN_CLASSIFICATION;
  import static android.view.ViewRootImpl.NEW_INSETS_MODE_FULL;
  import static android.view.accessibility.AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED;
  
  import static java.lang.Math.max;
  
  import android.animation.AnimatorInflater;
  import android.animation.StateListAnimator;
  import android.annotation.AttrRes;
  import android.annotation.CallSuper;
  import android.annotation.ColorInt;
  import android.annotation.DrawableRes;
  import android.annotation.FloatRange;
  import android.annotation.IdRes;
  import android.annotation.IntDef;
  import android.annotation.IntRange;
  import android.annotation.LayoutRes;
  import android.annotation.NonNull;
  import android.annotation.Nullable;
  import android.annotation.Size;
  import android.annotation.StyleRes;
  import android.annotation.TestApi;
  import android.annotation.UiThread;
  import android.annotation.UnsupportedAppUsage;
  import android.content.AutofillOptions;
  import android.content.ClipData;
  import android.content.Context;
  import android.content.ContextWrapper;
  import android.content.Intent;
  import android.content.res.ColorStateList;
  import android.content.res.Configuration;
  import android.content.res.Resources;
  import android.content.res.TypedArray;
  import android.graphics.Bitmap;
  import android.graphics.BlendMode;
  import android.graphics.Canvas;
  import android.graphics.Color;
  import android.graphics.Insets;
  import android.graphics.Interpolator;
  import android.graphics.LinearGradient;
  import android.graphics.Matrix;
  import android.graphics.Outline;
  import android.graphics.Paint;
  import android.graphics.PixelFormat;
  import android.graphics.Point;
  import android.graphics.PorterDuff;
  import android.graphics.PorterDuffXfermode;
  import android.graphics.RecordingCanvas;
  import android.graphics.Rect;
  import android.graphics.RectF;
  import android.graphics.Region;
  import android.graphics.RenderNode;
  import android.graphics.Shader;
  import android.graphics.drawable.ColorDrawable;
  import android.graphics.drawable.Drawable;
  import android.hardware.display.DisplayManagerGlobal;
  import android.net.Uri;
  import android.os.Build;
  import android.os.Bundle;
  import android.os.Handler;
  import android.os.IBinder;
  import android.os.Message;
  import android.os.Parcel;
  import android.os.Parcelable;
  import android.os.RemoteException;
  import android.os.SystemClock;
  import android.os.Trace;
  import android.sysprop.DisplayProperties;
  import android.text.InputType;
  import android.text.TextUtils;
  import android.util.AttributeSet;
  import android.util.FloatProperty;
  import android.util.LayoutDirection;
  import android.util.Log;
  import android.util.LongSparseLongArray;
  import android.util.Pools.SynchronizedPool;
  import android.util.Property;
  import android.util.SparseArray;
  import android.util.SparseIntArray;
  import android.util.StateSet;
  import android.util.StatsLog;
  import android.util.SuperNotCalledException;
  import android.util.TypedValue;
  import android.view.AccessibilityIterators.CharacterTextSegmentIterator;
  import android.view.AccessibilityIterators.ParagraphTextSegmentIterator;
  import android.view.AccessibilityIterators.TextSegmentIterator;
  import android.view.AccessibilityIterators.WordTextSegmentIterator;
  import android.view.ContextMenu.ContextMenuInfo;
  import android.view.WindowInsetsAnimationListener.InsetsAnimation;
  import android.view.accessibility.AccessibilityEvent;
  import android.view.accessibility.AccessibilityEventSource;
  import android.view.accessibility.AccessibilityManager;
  import android.view.accessibility.AccessibilityNodeIdManager;
  import android.view.accessibility.AccessibilityNodeInfo;
  import android.view.accessibility.AccessibilityNodeInfo.AccessibilityAction;
  import android.view.accessibility.AccessibilityNodeProvider;
  import android.view.accessibility.AccessibilityWindowInfo;
  import android.view.animation.Animation;
  import android.view.animation.AnimationUtils;
  import android.view.animation.Transformation;
  import android.view.autofill.AutofillId;
  import android.view.autofill.AutofillManager;
  import android.view.autofill.AutofillValue;
  import android.view.contentcapture.ContentCaptureContext;
  import android.view.contentcapture.ContentCaptureManager;
  import android.view.contentcapture.ContentCaptureSession;
  import android.view.inputmethod.EditorInfo;
  import android.view.inputmethod.InputConnection;
  import android.view.inputmethod.InputMethodManager;
  import android.view.inspector.InspectableProperty;
  import android.view.inspector.InspectableProperty.EnumEntry;
  import android.view.inspector.InspectableProperty.FlagEntry;
  import android.widget.Checkable;
  import android.widget.FrameLayout;
  import android.widget.ScrollBarDrawable;
  
  import com.android.internal.R;
  import com.android.internal.view.TooltipPopup;
  import com.android.internal.view.menu.MenuBuilder;
  import com.android.internal.widget.ScrollBarUtils;
  
  import com.google.android.collect.Lists;
  import com.google.android.collect.Maps;
  
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  import java.lang.ref.WeakReference;
  import java.lang.reflect.Field;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.lang.reflect.Modifier;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Calendar;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  import java.util.concurrent.CopyOnWriteArrayList;
  import java.util.concurrent.atomic.AtomicInteger;
  import java.util.function.Predicate;
  
  /**
   * <p>
   * This class represents the basic building block for user interface components. A View
   * occupies a rectangular area on the screen and is responsible for drawing and
   * event handling. View is the base class for <em>widgets</em>, which are
   * used to create interactive UI components (buttons, text fields, etc.). The
   * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which
   * are invisible containers that hold other Views (or other ViewGroups) and define
   * their layout properties.
   * </p>
   *
   * <div class="special reference">
   * <h3>Developer Guides</h3>
   * <p>For information about using this class to develop your application's user interface,
   * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide.
   * </div>
   *
   * <a name="Using"></a>
   * <h3>Using Views</h3>
   * <p>
   * All of the views in a window are arranged in a single tree. You can add views
   * either from code or by specifying a tree of views in one or more XML layout
   * files. There are many specialized subclasses of views that act as controls or
   * are capable of displaying text, images, or other content.
   * </p>
   * <p>
   * Once you have created a tree of views, there are typically a few types of
   * common operations you may wish to perform:
   * <ul>
   * <li><strong>Set properties:</strong> for example setting the text of a
   * {@link android.widget.TextView}. The available properties and the methods
   * that set them will vary among the different subclasses of views. Note that
   * properties that are known at build time can be set in the XML layout
   * files.</li>
   * <li><strong>Set focus:</strong> The framework will handle moving focus in
   * response to user input. To force focus to a specific view, call
   * {@link #requestFocus}.</li>
   * <li><strong>Set up listeners:</strong> Views allow clients to set listeners
   * that will be notified when something interesting happens to the view. For
   * example, all views will let you set a listener to be notified when the view
   * gains or loses focus. You can register such a listener using
   * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}.
   * Other view subclasses offer more specialized listeners. For example, a Button
   * exposes a listener to notify clients when the button is clicked.</li>
   * <li><strong>Set visibility:</strong> You can hide or show views using
   * {@link #setVisibility(int)}.</li>
   * </ul>
   * </p>
   * <p><em>
   * Note: The Android framework is responsible for measuring, laying out and
   * drawing views. You should not call methods that perform these actions on
   * views yourself unless you are actually implementing a
   * {@link android.view.ViewGroup}.
   * </em></p>
   *
   * <a name="Lifecycle"></a>
   * <h3>Implementing a Custom View</h3>
   *
   * <p>
   * To implement a custom view, you will usually begin by providing overrides for
   * some of the standard methods that the framework calls on all views. You do
   * not need to override all of these methods. In fact, you can start by just
   * overriding {@link #onDraw(android.graphics.Canvas)}.
   * <table border="2" width="85%" align="center" cellpadding="5">
   *     <thead>
   *         <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr>
   *     </thead>
   *
   *     <tbody>
   *     <tr>
   *         <td rowspan="2">Creation</td>
   *         <td>Constructors</td>
   *         <td>There is a form of the constructor that are called when the view
   *         is created from code and a form that is called when the view is
   *         inflated from a layout file. The second form should parse and apply
   *         any attributes defined in the layout file.
   *         </td>
   *     </tr>
   *     <tr>
   *         <td><code>{@link #onFinishInflate()}</code></td>
   *         <td>Called after a view and all of its children has been inflated
   *         from XML.</td>
   *     </tr>
   *
   *     <tr>
   *         <td rowspan="3">Layout</td>
   *         <td><code>{@link #onMeasure(int, int)}</code></td>
   *         <td>Called to determine the size requirements for this view and all
   *         of its children.
   *         </td>
   *     </tr>
   *     <tr>
   *         <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td>
   *         <td>Called when this view should assign a size and position to all
   *         of its children.
   *         </td>
   *     </tr>
   *     <tr>
   *         <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td>
   *         <td>Called when the size of this view has changed.
   *         </td>
   *     </tr>
   *
   *     <tr>
   *         <td>Drawing</td>
   *         <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td>
   *         <td>Called when the view should render its content.
   *         </td>
   *     </tr>
   *
   *     <tr>
   *         <td rowspan="4">Event processing</td>
   *         <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td>
   *         <td>Called when a new hardware key event occurs.
   *         </td>
   *     </tr>
   *     <tr>
   *         <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td>
   *         <td>Called when a hardware key up event occurs.
   *         </td>
   *     </tr>
   *     <tr>
   *         <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td>
   *         <td>Called when a trackball motion event occurs.
   *         </td>
   *     </tr>
   *     <tr>
   *         <td><code>{@link #onTouchEvent(MotionEvent)}</code></td>
   *         <td>Called when a touch screen motion event occurs.
   *         </td>
   *     </tr>
   *
   *     <tr>
   *         <td rowspan="2">Focus</td>
   *         <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td>
   *         <td>Called when the view gains or loses focus.
   *         </td>
   *     </tr>
   *
   *     <tr>
   *         <td><code>{@link #onWindowFocusChanged(boolean)}</code></td>
   *         <td>Called when the window containing the view gains or loses focus.
   *         </td>
   *     </tr>
   *
   *     <tr>
   *         <td rowspan="3">Attaching</td>
   *         <td><code>{@link #onAttachedToWindow()}</code></td>
   *         <td>Called when the view is attached to a window.
   *         </td>
   *     </tr>
   *
   *     <tr>
   *         <td><code>{@link #onDetachedFromWindow}</code></td>
   *         <td>Called when the view is detached from its window.
   *         </td>
   *     </tr>
   *
   *     <tr>
   *         <td><code>{@link #onWindowVisibilityChanged(int)}</code></td>
   *         <td>Called when the visibility of the window containing the view
   *         has changed.
   *         </td>
   *     </tr>
   *     </tbody>
   *
   * </table>
   * </p>
   *
   * <a name="IDs"></a>
   * <h3>IDs</h3>
   * Views may have an integer id associated with them. These ids are typically
   * assigned in the layout XML files, and are used to find specific views within
   * the view tree. A common pattern is to:
   * <ul>
   * <li>Define a Button in the layout file and assign it a unique ID.
   * <pre>
   * &lt;Button
   *     android:id="@+id/my_button"
   *     android:layout_width="wrap_content"
   *     android:layout_height="wrap_content"
   *     android:text="@string/my_button_text"/&gt;
   * </pre></li>
   * <li>From the onCreate method of an Activity, find the Button
   * <pre class="prettyprint">
   *      Button myButton = findViewById(R.id.my_button);
   * </pre></li>
   * </ul>
   * <p>
   * View IDs need not be unique throughout the tree, but it is good practice to
   * ensure that they are at least unique within the part of the tree you are
   * searching.
   * </p>
   *
   * <a name="Position"></a>
   * <h3>Position</h3>
   * <p>
   * The geometry of a view is that of a rectangle. A view has a location,
   * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and
   * two dimensions, expressed as a width and a height. The unit for location
   * and dimensions is the pixel.
   * </p>
   *
   * <p>
   * It is possible to retrieve the location of a view by invoking the methods
   * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X,
   * coordinate of the rectangle representing the view. The latter returns the
   * top, or Y, coordinate of the rectangle representing the view. These methods
   * both return the location of the view relative to its parent. For instance,
   * when getLeft() returns 20, that means the view is located 20 pixels to the
   * right of the left edge of its direct parent.
   * </p>
   *
   * <p>
   * In addition, several convenience methods are offered to avoid unnecessary
   * computations, namely {@link #getRight()} and {@link #getBottom()}.
   * These methods return the coordinates of the right and bottom edges of the
   * rectangle representing the view. For instance, calling {@link #getRight()}
   * is similar to the following computation: <code>getLeft() + getWidth()</code>
   * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.)
   * </p>
   *
   * <a name="SizePaddingMargins"></a>
   * <h3>Size, padding and margins</h3>
   * <p>
   * The size of a view is expressed with a width and a height. A view actually
   * possess two pairs of width and height values.
   * </p>
   *
   * <p>
   * The first pair is known as <em>measured width</em> and
   * <em>measured height</em>. These dimensions define how big a view wants to be
   * within its parent (see <a href="#Layout">Layout</a> for more details.) The
   * measured dimensions can be obtained by calling {@link #getMeasuredWidth()}
   * and {@link #getMeasuredHeight()}.
   * </p>
   *
   * <p>
   * The second pair is simply known as <em>width</em> and <em>height</em>, or
   * sometimes <em>drawing width</em> and <em>drawing height</em>. These
   * dimensions define the actual size of the view on screen, at drawing time and
   * after layout. These values may, but do not have to, be different from the
   * measured width and height. The width and height can be obtained by calling
   * {@link #getWidth()} and {@link #getHeight()}.
   * </p>
   *
   * <p>
   * To measure its dimensions, a view takes into account its padding. The padding
   * is expressed in pixels for the left, top, right and bottom parts of the view.
   * Padding can be used to offset the content of the view by a specific amount of
   * pixels. For instance, a left padding of 2 will push the view's content by
   * 2 pixels to the right of the left edge. Padding can be set using the
   * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)}
   * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()},
   * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()},
   * {@link #getPaddingEnd()}.
   * </p>
   *
   * <p>
   * Even though a view can define a padding, it does not provide any support for
   * margins. However, view groups provide such a support. Refer to
   * {@link android.view.ViewGroup} and
   * {@link android.view.ViewGroup.MarginLayoutParams} for further information.
   * </p>
   *
   * <a name="Layout"></a>
   * <h3>Layout</h3>
   * <p>
   * Layout is a two pass process: a measure pass and a layout pass. The measuring
   * pass is implemented in {@link #measure(int, int)} and is a top-down traversal
   * of the view tree. Each view pushes dimension specifications down the tree
   * during the recursion. At the end of the measure pass, every view has stored
   * its measurements. The second pass happens in
   * {@link #layout(int,int,int,int)} and is also top-down. During
   * this pass each parent is responsible for positioning all of its children
   * using the sizes computed in the measure pass.
   * </p>
   *
   * <p>
   * When a view's measure() method returns, its {@link #getMeasuredWidth()} and
   * {@link #getMeasuredHeight()} values must be set, along with those for all of
   * that view's descendants. A view's measured width and measured height values
   * must respect the constraints imposed by the view's parents. This guarantees
   * that at the end of the measure pass, all parents accept all of their
   * children's measurements. A parent view may call measure() more than once on
   * its children. For example, the parent may measure each child once with
   * unspecified dimensions to find out how big they want to be, then call
   * measure() on them again with actual numbers if the sum of all the children's
   * unconstrained sizes is too big or too small.
   * </p>
   *
   * <p>
   * The measure pass uses two classes to communicate dimensions. The
   * {@link MeasureSpec} class is used by views to tell their parents how they
   * want to be measured and positioned. The base LayoutParams class just
   * describes how big the view wants to be for both width and height. For each
   * dimension, it can specify one of:
   * <ul>
   * <li> an exact number
   * <li>MATCH_PARENT, which means the view wants to be as big as its parent
   * (minus padding)
   * <li> WRAP_CONTENT, which means that the view wants to be just big enough to
   * enclose its content (plus padding).
   * </ul>
   * There are subclasses of LayoutParams for different subclasses of ViewGroup.
   * For example, AbsoluteLayout has its own subclass of LayoutParams which adds
   * an X and Y value.
   * </p>
   *
   * <p>
   * MeasureSpecs are used to push requirements down the tree from parent to
   * child. A MeasureSpec can be in one of three modes:
   * <ul>
   * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension
   * of a child view. For example, a LinearLayout may call measure() on its child
   * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how
   * tall the child view wants to be given a width of 240 pixels.
   * <li>EXACTLY: This is used by the parent to impose an exact size on the
   * child. The child must use this size, and guarantee that all of its
   * descendants will fit within this size.
   * <li>AT_MOST: This is used by the parent to impose a maximum size on the
   * child. The child must guarantee that it and all of its descendants will fit
   * within this size.
   * </ul>
   * </p>
   *
   * <p>
   * To initiate a layout, call {@link #requestLayout}. This method is typically
   * called by a view on itself when it believes that it can no longer fit within
   * its current bounds.
   * </p>
   *
   * <a name="Drawing"></a>
   * <h3>Drawing</h3>
   * <p>
   * Drawing is handled by walking the tree and recording the drawing commands of
   * any View that needs to update. After this, the drawing commands of the
   * entire tree are issued to screen, clipped to the newly damaged area.
   * </p>
   *
   * <p>
   * The tree is largely recorded and drawn in order, with parents drawn before
   * (i.e., behind) their children, with siblings drawn in the order they appear
   * in the tree. If you set a background drawable for a View, then the View will
   * draw it before calling back to its <code>onDraw()</code> method. The child
   * drawing order can be overridden with
   * {@link ViewGroup#setChildrenDrawingOrderEnabled(boolean) custom child drawing order}
   * in a ViewGroup, and with {@link #setZ(float)} custom Z values} set on Views.
   * </p>
   *
   * <p>
   * To force a view to draw, call {@link #invalidate()}.
   * </p>
   *
   * <a name="EventHandlingThreading"></a>
   * <h3>Event Handling and Threading</h3>
   * <p>
   * The basic cycle of a view is as follows:
   * <ol>
   * <li>An event comes in and is dispatched to the appropriate view. The view
   * handles the event and notifies any listeners.</li>
   * <li>If in the course of processing the event, the view's bounds may need
   * to be changed, the view will call {@link #requestLayout()}.</li>
   * <li>Similarly, if in the course of processing the event the view's appearance
   * may need to be changed, the view will call {@link #invalidate()}.</li>
   * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called,
   * the framework will take care of measuring, laying out, and drawing the tree
   * as appropriate.</li>
   * </ol>
   * </p>
   *
   * <p><em>Note: The entire view tree is single threaded. You must always be on
   * the UI thread when calling any method on any view.</em>
   * If you are doing work on other threads and want to update the state of a view
   * from that thread, you should use a {@link Handler}.
   * </p>
   *
   * <a name="FocusHandling"></a>
   * <h3>Focus Handling</h3>
   * <p>
   * The framework will handle routine focus movement in response to user input.
   * This includes changing the focus as views are removed or hidden, or as new
   * views become available. Views indicate their willingness to take focus
   * through the {@link #isFocusable} method. To change whether a view can take
   * focus, call {@link #setFocusable(boolean)}.  When in touch mode (see notes below)
   * views indicate whether they still would like focus via {@link #isFocusableInTouchMode}
   * and can change this via {@link #setFocusableInTouchMode(boolean)}.
   * </p>
   * <p>
   * Focus movement is based on an algorithm which finds the nearest neighbor in a
   * given direction. In rare cases, the default algorithm may not match the
   * intended behavior of the developer. In these situations, you can provide
   * explicit overrides by using these XML attributes in the layout file:
   * <pre>
   * nextFocusDown
   * nextFocusLeft
   * nextFocusRight
   * nextFocusUp
   * </pre>
   * </p>
   *
   *
   * <p>
   * To get a particular view to take focus, call {@link #requestFocus()}.
   * </p>
   *
   * <a name="TouchMode"></a>
   * <h3>Touch Mode</h3>
   * <p>
   * When a user is navigating a user interface via directional keys such as a D-pad, it is
   * necessary to give focus to actionable items such as buttons so the user can see
   * what will take input.  If the device has touch capabilities, however, and the user
   * begins interacting with the interface by touching it, it is no longer necessary to
   * always highlight, or give focus to, a particular view.  This motivates a mode
   * for interaction named 'touch mode'.
   * </p>
   * <p>
   * For a touch capable device, once the user touches the screen, the device
   * will enter touch mode.  From this point onward, only views for which
   * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets.
   * Other views that are touchable, like buttons, will not take focus when touched; they will
   * only fire the on click listeners.
   * </p>
   * <p>
   * Any time a user hits a directional key, such as a D-pad direction, the view device will
   * exit touch mode, and find a view to take focus, so that the user may resume interacting
   * with the user interface without touching the screen again.
   * </p>
   * <p>
   * The touch mode state is maintained across {@link android.app.Activity}s.  Call
   * {@link #isInTouchMode} to see whether the device is currently in touch mode.
   * </p>
   *
   * <a name="Scrolling"></a>
   * <h3>Scrolling</h3>
   * <p>
   * The framework provides basic support for views that wish to internally
   * scroll their content. This includes keeping track of the X and Y scroll
   * offset as well as mechanisms for drawing scrollbars. See
   * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and
   * {@link #awakenScrollBars()} for more details.
   * </p>
   *
   * <a name="Tags"></a>
   * <h3>Tags</h3>
   * <p>
   * Unlike IDs, tags are not used to identify views. Tags are essentially an
   * extra piece of information that can be associated with a view. They are most
   * often used as a convenience to store data related to views in the views
   * themselves rather than by putting them in a separate structure.
   * </p>
   * <p>
   * Tags may be specified with character sequence values in layout XML as either
   * a single tag using the {@link android.R.styleable#View_tag android:tag}
   * attribute or multiple tags using the {@code <tag>} child element:
   * <pre>
   *     &lt;View ...
   *           android:tag="@string/mytag_value" /&gt;
   *     &lt;View ...&gt;
   *         &lt;tag android:id="@+id/mytag"
   *              android:value="@string/mytag_value" /&gt;
   *     &lt;/View>
   * </pre>
   * </p>
   * <p>
   * Tags may also be specified with arbitrary objects from code using
   * {@link #setTag(Object)} or {@link #setTag(int, Object)}.
   * </p>
   *
   * <a name="Themes"></a>
   * <h3>Themes</h3>
   * <p>
   * By default, Views are created using the theme of the Context object supplied
   * to their constructor; however, a different theme may be specified by using
   * the {@link android.R.styleable#View_theme android:theme} attribute in layout
   * XML or by passing a {@link ContextThemeWrapper} to the constructor from
   * code.
   * </p>
   * <p>
   * When the {@link android.R.styleable#View_theme android:theme} attribute is
   * used in XML, the specified theme is applied on top of the inflation
   * context's theme (see {@link LayoutInflater}) and used for the view itself as
   * well as any child elements.
   * </p>
   * <p>
   * In the following example, both views will be created using the Material dark
   * color scheme; however, because an overlay theme is used which only defines a
   * subset of attributes, the value of
   * {@link android.R.styleable#Theme_colorAccent android:colorAccent} defined on
   * the inflation context's theme (e.g. the Activity theme) will be preserved.
   * <pre>
   *     &lt;LinearLayout
   *             ...
   *             android:theme="@android:theme/ThemeOverlay.Material.Dark"&gt;
   *         &lt;View ...&gt;
   *     &lt;/LinearLayout&gt;
   * </pre>
   * </p>
   *
   * <a name="Properties"></a>
   * <h3>Properties</h3>
   * <p>
   * The View class exposes an {@link #ALPHA} property, as well as several transform-related
   * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are
   * available both in the {@link Property} form as well as in similarly-named setter/getter
   * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can
   * be used to set persistent state associated with these rendering-related properties on the view.
   * The properties and methods can also be used in conjunction with
   * {@link android.animation.Animator Animator}-based animations, described more in the
   * <a href="#Animation">Animation</a> section.
   * </p>
   *
   * <a name="Animation"></a>
   * <h3>Animation</h3>
   * <p>
   * Starting with Android 3.0, the preferred way of animating views is to use the
   * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based
   * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and
   * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0
   * {@link android.view.animation.Animation Animation}-based classes, which instead animate only
   * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class
   * makes animating these View properties particularly easy and efficient.
   * </p>
   * <p>
   * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered.
   * You can attach an {@link Animation} object to a view using
   * {@link #setAnimation(Animation)} or
   * {@link #startAnimation(Animation)}. The animation can alter the scale,
   * rotation, translation and alpha of a view over time. If the animation is
   * attached to a view that has children, the animation will affect the entire
   * subtree rooted by that node. When an animation is started, the framework will
   * take care of redrawing the appropriate views until the animation completes.
   * </p>
   *
   * <a name="Security"></a>
   * <h3>Security</h3>
   * <p>
   * Sometimes it is essential that an application be able to verify that an action
   * is being performed with the full knowledge and consent of the user, such as
   * granting a permission request, making a purchase or clicking on an advertisement.
   * Unfortunately, a malicious application could try to spoof the user into
   * performing these actions, unaware, by concealing the intended purpose of the view.
   * As a remedy, the framework offers a touch filtering mechanism that can be used to
   * improve the security of views that provide access to sensitive functionality.
   * </p><p>
   * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the
   * android:filterTouchesWhenObscured layout attribute to true.  When enabled, the framework
   * will discard touches that are received whenever the view's window is obscured by
   * another visible window.  As a result, the view will not receive touches whenever a
   * toast, dialog or other window appears above the view's window.
   * </p><p>
   * For more fine-grained control over security, consider overriding the
   * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own
   * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}.
   * </p>
   *
   * @attr ref android.R.styleable#View_accessibilityHeading
   * @attr ref android.R.styleable#View_alpha
   * @attr ref android.R.styleable#View_background
   * @attr ref android.R.styleable#View_clickable
   * @attr ref android.R.styleable#View_contentDescription
   * @attr ref android.R.styleable#View_drawingCacheQuality
   * @attr ref android.R.styleable#View_duplicateParentState
   * @attr ref android.R.styleable#View_id
   * @attr ref android.R.styleable#View_requiresFadingEdge
   * @attr ref android.R.styleable#View_fadeScrollbars
   * @attr ref android.R.styleable#View_fadingEdgeLength
   * @attr ref android.R.styleable#View_filterTouchesWhenObscured
   * @attr ref android.R.styleable#View_fitsSystemWindows
   * @attr ref android.R.styleable#View_isScrollContainer
   * @attr ref android.R.styleable#View_focusable
   * @attr ref android.R.styleable#View_focusableInTouchMode
   * @attr ref android.R.styleable#View_focusedByDefault
   * @attr ref android.R.styleable#View_hapticFeedbackEnabled
   * @attr ref android.R.styleable#View_keepScreenOn
   * @attr ref android.R.styleable#View_keyboardNavigationCluster
   * @attr ref android.R.styleable#View_layerType
   * @attr ref android.R.styleable#View_layoutDirection
   * @attr ref android.R.styleable#View_longClickable
   * @attr ref android.R.styleable#View_minHeight
   * @attr ref android.R.styleable#View_minWidth
   * @attr ref android.R.styleable#View_nextClusterForward
   * @attr ref android.R.styleable#View_nextFocusDown
   * @attr ref android.R.styleable#View_nextFocusLeft
   * @attr ref android.R.styleable#View_nextFocusRight
   * @attr ref android.R.styleable#View_nextFocusUp
   * @attr ref android.R.styleable#View_onClick
   * @attr ref android.R.styleable#View_outlineSpotShadowColor
   * @attr ref android.R.styleable#View_outlineAmbientShadowColor
   * @attr ref android.R.styleable#View_padding
   * @attr ref android.R.styleable#View_paddingHorizontal
   * @attr ref android.R.styleable#View_paddingVertical
   * @attr ref android.R.styleable#View_paddingBottom
   * @attr ref android.R.styleable#View_paddingLeft
   * @attr ref android.R.styleable#View_paddingRight
   * @attr ref android.R.styleable#View_paddingTop
   * @attr ref android.R.styleable#View_paddingStart
   * @attr ref android.R.styleable#View_paddingEnd
   * @attr ref android.R.styleable#View_saveEnabled
   * @attr ref android.R.styleable#View_rotation
   * @attr ref android.R.styleable#View_rotationX
   * @attr ref android.R.styleable#View_rotationY
   * @attr ref android.R.styleable#View_scaleX
   * @attr ref android.R.styleable#View_scaleY
   * @attr ref android.R.styleable#View_scrollX
   * @attr ref android.R.styleable#View_scrollY
   * @attr ref android.R.styleable#View_scrollbarSize
   * @attr ref android.R.styleable#View_scrollbarStyle
   * @attr ref android.R.styleable#View_scrollbars
   * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade
   * @attr ref android.R.styleable#View_scrollbarFadeDuration
   * @attr ref android.R.styleable#View_scrollbarTrackHorizontal
   * @attr ref android.R.styleable#View_scrollbarThumbHorizontal
   * @attr ref android.R.styleable#View_scrollbarThumbVertical
   * @attr ref android.R.styleable#View_scrollbarTrackVertical
   * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack
   * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack
   * @attr ref android.R.styleable#View_stateListAnimator
   * @attr ref android.R.styleable#View_transitionName
   * @attr ref android.R.styleable#View_soundEffectsEnabled
   * @attr ref android.R.styleable#View_tag
   * @attr ref android.R.styleable#View_textAlignment
   * @attr ref android.R.styleable#View_textDirection
   * @attr ref android.R.styleable#View_transformPivotX
   * @attr ref android.R.styleable#View_transformPivotY
   * @attr ref android.R.styleable#View_translationX
   * @attr ref android.R.styleable#View_translationY
   * @attr ref android.R.styleable#View_translationZ
   * @attr ref android.R.styleable#View_visibility
   * @attr ref android.R.styleable#View_theme
   *
   * @see android.view.ViewGroup
   */
  @UiThread
  public class View implements Drawable.Callback, KeyEvent.Callback,
          AccessibilityEventSource {
      @UnsupportedAppUsage
      private static final boolean DBG = false;
  
      /** @hide */
      public static boolean DEBUG_DRAW = false;
  
      /**
       * The logging tag used by this class with android.util.Log.
       */
      protected static final String VIEW_LOG_TAG = "View";
  
      /**
       * The logging tag used by this class when logging verbose, autofill-related messages.
       */
      // NOTE: We cannot use android.view.autofill.Helper.sVerbose because that variable is not
      // set if a session is not started.
      private static final String AUTOFILL_LOG_TAG = "View.Autofill";
  
      /**
       * The logging tag used by this class when logging content capture-related messages.
       */
      private static final String CONTENT_CAPTURE_LOG_TAG = "View.ContentCapture";
  
      private static final boolean DEBUG_CONTENT_CAPTURE = false;
  
      /**
       * When set to true, this view will save its attribute data.
       *
       * @hide
       */
      public static boolean sDebugViewAttributes = false;
  
      /**
       * When set to this application package view will save its attribute data.
       *
       * @hide
       */
      public static String sDebugViewAttributesApplicationPackage;
  
      /**
       * Used to mark a View that has no ID.
       */
      public static final int NO_ID = -1;
  
      /**
       * Last ID that is given to Views that are no part of activities.
       *
       * {@hide}
       */
      public static final int LAST_APP_AUTOFILL_ID = Integer.MAX_VALUE / 2;
  
      /**
       * Attribute to find the autofilled highlight
       *
       * @see #getAutofilledDrawable()
       */
      private static final int[] AUTOFILL_HIGHLIGHT_ATTR =
              new int[]{android.R.attr.autofilledHighlight};
  
      /**
       * Signals that compatibility booleans have been initialized according to
       * target SDK versions.
       */
      private static boolean sCompatibilityDone = false;
  
      /**
       * Use the old (broken) way of building MeasureSpecs.
       */
      private static boolean sUseBrokenMakeMeasureSpec = false;
  
      /**
       * Always return a size of 0 for MeasureSpec values with a mode of UNSPECIFIED
       */
      static boolean sUseZeroUnspecifiedMeasureSpec = false;
  
      /**
       * Ignore any optimizations using the measure cache.
       */
      private static boolean sIgnoreMeasureCache = false;
  
      /**
       * Ignore an optimization that skips unnecessary EXACTLY layout passes.
       */
      private static boolean sAlwaysRemeasureExactly = false;
  
      /**
       * Allow setForeground/setBackground to be called (and ignored) on a textureview,
       * without throwing
       */
      static boolean sTextureViewIgnoresDrawableSetters = false;
  
      /**
       * Prior to N, some ViewGroups would not convert LayoutParams properly even though both extend
       * MarginLayoutParams. For instance, converting LinearLayout.LayoutParams to
       * RelativeLayout.LayoutParams would lose margin information. This is fixed on N but target API
       * check is implemented for backwards compatibility.
       *
       * {@hide}
       */
      protected static boolean sPreserveMarginParamsInLayoutParamConversion;
  
      /**
       * Prior to N, when drag enters into child of a view that has already received an
       * ACTION_DRAG_ENTERED event, the parent doesn't get a ACTION_DRAG_EXITED event.
       * ACTION_DRAG_LOCATION and ACTION_DROP were delivered to the parent of a view that returned
       * false from its event handler for these events.
       * Starting from N, the parent will get ACTION_DRAG_EXITED event before the child gets its
       * ACTION_DRAG_ENTERED. ACTION_DRAG_LOCATION and ACTION_DROP are never propagated to the parent.
       * sCascadedDragDrop is true for pre-N apps for backwards compatibility implementation.
       */
      static boolean sCascadedDragDrop;
  
      /**
       * Prior to O, auto-focusable didn't exist and widgets such as ListView use hasFocusable
       * to determine things like whether or not to permit item click events. We can't break
       * apps that do this just because more things (clickable things) are now auto-focusable
       * and they would get different results, so give old behavior to old apps.
       */
      static boolean sHasFocusableExcludeAutoFocusable;
  
      /**
       * Prior to O, auto-focusable didn't exist and views marked as clickable weren't implicitly
       * made focusable by default. As a result, apps could (incorrectly) change the clickable
       * setting of views off the UI thread. Now that clickable can effect the focusable state,
       * changing the clickable attribute off the UI thread will cause an exception (since changing
       * the focusable state checks). In order to prevent apps from crashing, we will handle this
       * specific case and just not notify parents on new focusables resulting from marking views
       * clickable from outside the UI thread.
       */
      private static boolean sAutoFocusableOffUIThreadWontNotifyParents;
  
      /**
       * Prior to P things like setScaleX() allowed passing float values that were bogus such as
       * Float.NaN. If the app is targetting P or later then passing these values will result in an
       * exception being thrown. If the app is targetting an earlier SDK version, then we will
       * silently clamp these values to avoid crashes elsewhere when the rendering code hits
       * these bogus values.
       */
      private static boolean sThrowOnInvalidFloatProperties;
  
      /**
       * Prior to P, {@code #startDragAndDrop} accepts a builder which produces an empty drag shadow.
       * Currently zero size SurfaceControl cannot be created thus we create a dummy 1x1 surface
       * instead.
       */
      private static boolean sAcceptZeroSizeDragShadow;
  
      /**
       * Prior to Q, {@link #dispatchApplyWindowInsets} had some issues:
       * <ul>
       *     <li>The modified insets changed by {@link #onApplyWindowInsets} were passed to the
       *     entire view hierarchy in prefix order, including siblings as well as siblings of parents
       *     further down the hierarchy. This violates the basic concepts of the view hierarchy, and
       *     thus, the hierarchical dispatching mechanism was hard to use for apps.</li>
       *
       *     <li>Dispatch was stopped after the insets were fully consumed. This is somewhat confusing
       *     for developers, but more importantly, by adding more granular information to
       *     {@link WindowInsets} it becomes really cumbersome to define what consumed actually means
       *     </li>
       * </ul>
       *
       * In order to make window inset dispatching work properly, we dispatch window insets
       * in the view hierarchy in a proper hierarchical manner and don't stop dispatching if the
       * insets are consumed if this flag is set to {@code false}.
       */
      static boolean sBrokenInsetsDispatch;
  
      /**
       * Prior to Q, calling
       * {@link com.android.internal.policy.DecorView#setBackgroundDrawable(Drawable)}
       * did not call update the window format so the opacity of the background was not correctly
       * applied to the window. Some applications rely on this misbehavior to work properly.
       * <p>
       * From Q, {@link com.android.internal.policy.DecorView#setBackgroundDrawable(Drawable)} is
       * the same as {@link com.android.internal.policy.DecorView#setWindowBackground(Drawable)}
       * which updates the window format.
       * @hide
       */
      protected static boolean sBrokenWindowBackground;
  
      /** @hide */
      @IntDef({NOT_FOCUSABLE, FOCUSABLE, FOCUSABLE_AUTO})
      @Retention(RetentionPolicy.SOURCE)
      public @interface Focusable {}
  
      /**
       * This view does not want keystrokes.
       * <p>
       * Use with {@link #setFocusable(int)} and <a href="#attr_android:focusable">{@code
       * android:focusable}.
       */
      public static final int NOT_FOCUSABLE = 0x00000000;
  
      /**
       * This view wants keystrokes.
       * <p>
       * Use with {@link #setFocusable(int)} and <a href="#attr_android:focusable">{@code
       * android:focusable}.
       */
      public static final int FOCUSABLE = 0x00000001;
  
      /**
       * This view determines focusability automatically. This is the default.
       * <p>
       * Use with {@link #setFocusable(int)} and <a href="#attr_android:focusable">{@code
       * android:focusable}.
       */
      public static final int FOCUSABLE_AUTO = 0x00000010;
  
      /**
       * Mask for use with setFlags indicating bits used for focus.
       */
      private static final int FOCUSABLE_MASK = 0x00000011;
  
      /**
       * This view will adjust its padding to fit sytem windows (e.g. status bar)
       */
      private static final int FITS_SYSTEM_WINDOWS = 0x00000002;
  
      /** @hide */
      @IntDef({VISIBLE, INVISIBLE, GONE})
      @Retention(RetentionPolicy.SOURCE)
      public @interface Visibility {}
  
      /**
       * This view is visible.
       * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code
       * android:visibility}.
       */
      public static final int VISIBLE = 0x00000000;
  
      /**
       * This view is invisible, but it still takes up space for layout purposes.
       * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code
       * android:visibility}.
       */
      public static final int INVISIBLE = 0x00000004;
  
      /**
       * This view is invisible, and it doesn't take any space for layout
       * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code
       * android:visibility}.
       */
      public static final int GONE = 0x00000008;
  
      /**
       * Mask for use with setFlags indicating bits used for visibility.
       * {@hide}
       */
      static final int VISIBILITY_MASK = 0x0000000C;
  
      private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE};
  
      /**
       * Hint indicating that this view can be autofilled with an email address.
       *
       * <p>Can be used with either {@link #setAutofillHints(String[])} or
       * <a href="#attr_android:autofillHint"> {@code android:autofillHint}</a> (in which case the
       * value should be <code>{@value #AUTOFILL_HINT_EMAIL_ADDRESS}</code>).
       *
       * <p>See {@link #setAutofillHints(String...)} for more info about autofill hints.
       */
      public static final String AUTOFILL_HINT_EMAIL_ADDRESS = "emailAddress";
  
      /**
       * Hint indicating that this view can be autofilled with a user's real name.
       *
       * <p>Can be used with either {@link #setAutofillHints(String[])} or
       * <a href="#attr_android:autofillHint"> {@code android:autofillHint}</a> (in which case the
       * value should be <code>{@value #AUTOFILL_HINT_NAME}</code>).
       *
       * <p>See {@link #setAutofillHints(String...)} for more info about autofill hints.
       */
      public static final String AUTOFILL_HINT_NAME = "name";
  
      /**
       * Hint indicating that this view can be autofilled with a username.
       *
       * <p>Can be used with either {@link #setAutofillHints(String[])} or
       * <a href="#attr_android:autofillHint"> {@code android:autofillHint}</a> (in which case the
       * value should be <code>{@value #AUTOFILL_HINT_USERNAME}</code>).
       *
       * <p>See {@link #setAutofillHints(String...)} for more info about autofill hints.
       */
      public static final String AUTOFILL_HINT_USERNAME = "username";
  
      /**
       * Hint indicating that this view can be autofilled with a password.
       *
       * <p>Can be used with either {@link #setAutofillHints(String[])} or
       * <a href="#attr_android:autofillHint"> {@code android:autofillHint}</a> (in which case the
       * value should be <code>{@value #AUTOFILL_HINT_PASSWORD}</code>).
       *
       * <p>See {@link #setAutofillHints(String...)} for more info about autofill hints.
       */
      public static final String AUTOFILL_HINT_PASSWORD = "password";
  
      /**
       * Hint indicating that this view can be autofilled with a phone number.
       *
       * <p>Can be used with either {@link #setAutofillHints(String[])} or
       * <a href="#attr_android:autofillHint"> {@code android:autofillHint}</a> (in which case the
       * value should be <code>{@value #AUTOFILL_HINT_PHONE}</code>).
       *
       * <p>See {@link #setAutofillHints(String...)} for more info about autofill hints.
       */
      public static final String AUTOFILL_HINT_PHONE = "phone";
  
      /**
       * Hint indicating that this view can be autofilled with a postal address.
       *
       * <p>Can be used with either {@link #setAutofillHints(String[])} or
       * <a href="#attr_android:autofillHint"> {@code android:autofillHint}</a> (in which case the
       * value should be <code>{@value #AUTOFILL_HINT_POSTAL_ADDRESS}</code>).
       *
       * <p>See {@link #setAutofillHints(String...)} for more info about autofill hints.
       */
      public static final String AUTOFILL_HINT_POSTAL_ADDRESS = "postalAddress";
  
      /**
       * Hint indicating that this view can be autofilled with a postal code.
       *
       * <p>Can be used with either {@link #setAutofillHints(String[])} or
       * <a href="#attr_android:autofillHint"> {@code android:autofillHint}</a> (in which case the
       * value should be <code>{@value #AUTOFILL_HINT_POSTAL_CODE}</code>).
       *
       * <p>See {@link #setAutofillHints(String...)} for more info about autofill hints.
       */
      public static final String AUTOFILL_HINT_POSTAL_CODE = "postalCode";
  
      /**
       * Hint indicating that this view can be autofilled with a credit card number.
       *
       * <p>Can be used with either {@link #setAutofillHints(String[])} or
       * <a href="#attr_android:autofillHint"> {@code android:autofillHint}</a> (in which case the
       * value should be <code>{@value #AUTOFILL_HINT_CREDIT_CARD_NUMBER}</code>).
       *
       * <p>See {@link #setAutofillHints(String...)} for more info about autofill hints.
       */
      public static final String AUTOFILL_HINT_CREDIT_CARD_NUMBER = "creditCardNumber";
  
      /**
       * Hint indicating that this view can be autofilled with a credit card security code.
       *
       * <p>Can be used with either {@link #setAutofillHints(String[])} or
       * <a href="#attr_android:autofillHint"> {@code android:autofillHint}</a> (in which case the
       * value should be <code>{@value #AUTOFILL_HINT_CREDIT_CARD_SECURITY_CODE}</code>).
       *
       * <p>See {@link #setAutofillHints(String...)} for more info about autofill hints.
       */
      public static final String AUTOFILL_HINT_CREDIT_CARD_SECURITY_CODE = "creditCardSecurityCode";
  
      /**
       * Hint indicating that this view can be autofilled with a credit card expiration date.
       *
       * <p>It should be used when the credit card expiration date is represented by just one view;
       * if it is represented by more than one (for example, one view for the month and another view
       * for the year), then each of these views should use the hint specific for the unit
       * ({@link #AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DAY},
       * {@link #AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_MONTH},
       * or {@link #AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_YEAR}).
       *
       * <p>Can be used with either {@link #setAutofillHints(String[])} or
       * <a href="#attr_android:autofillHint"> {@code android:autofillHint}</a> (in which case the
       * value should be <code>{@value #AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DATE}</code>).
       *
       * <p>When annotating a view with this hint, it's recommended to use a date autofill value to
       * avoid ambiguity when the autofill service provides a value for it. To understand why a
       * value can be ambiguous, consider "April of 2020", which could be represented as either of
       * the following options:
       *
       * <ul>
       *   <li>{@code "04/2020"}
       *   <li>{@code "4/2020"}
       *   <li>{@code "2020/04"}
       *   <li>{@code "2020/4"}
       *   <li>{@code "April/2020"}
       *   <li>{@code "Apr/2020"}
       * </ul>
       *
       * <p>You define a date autofill value for the view by overriding the following methods:
       *
       * <ol>
       *   <li>{@link #getAutofillType()} to return {@link #AUTOFILL_TYPE_DATE}.
       *   <li>{@link #getAutofillValue()} to return a
       *       {@link AutofillValue#forDate(long) date autofillvalue}.
       *   <li>{@link #autofill(AutofillValue)} to expect a data autofillvalue.
       * </ol>
       *
       * <p>See {@link #setAutofillHints(String...)} for more info about autofill hints.
       */
      public static final String AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DATE =
              "creditCardExpirationDate";
  
      /**
       * Hint indicating that this view can be autofilled with a credit card expiration month.
       *
       * <p>Can be used with either {@link #setAutofillHints(String[])} or
       * <a href="#attr_android:autofillHint"> {@code android:autofillHint}</a> (in which case the
       * value should be <code>{@value #AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_MONTH}</code>).
       *
       * <p>When annotating a view with this hint, it's recommended to use a text autofill value
       * whose value is the numerical representation of the month, starting on {@code 1} to avoid
       * ambiguity when the autofill service provides a value for it. To understand why a
       * value can be ambiguous, consider "January", which could be represented as either of
       *
       * <ul>
       *   <li>{@code "1"}: recommended way.
       *   <li>{@code "0"}: if following the {@link Calendar#MONTH} convention.
       *   <li>{@code "January"}: full name, in English.
       *   <li>{@code "jan"}: abbreviated name, in English.
       *   <li>{@code "Janeiro"}: full name, in another language.
       * </ul>
       *
       * <p>Another recommended approach is to use a date autofill value - see
       * {@link #AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DATE} for more details.
       *
       * <p>See {@link #setAutofillHints(String...)} for more info about autofill hints.
       */
      public static final String AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_MONTH =
              "creditCardExpirationMonth";
  
      /**
       * Hint indicating that this view can be autofilled with a credit card expiration year.
       *
       * <p>Can be used with either {@link #setAutofillHints(String[])} or
       * <a href="#attr_android:autofillHint"> {@code android:autofillHint}</a> (in which case the
       * value should be <code>{@value #AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_YEAR}</code>).
       *
       * <p>See {@link #setAutofillHints(String...)} for more info about autofill hints.
       */
      public static final String AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_YEAR =
              "creditCardExpirationYear";
  
      /**
       * Hint indicating that this view can be autofilled with a credit card expiration day.
       *
       * <p>Can be used with either {@link #setAutofillHints(String[])} or
       * <a href="#attr_android:autofillHint"> {@code android:autofillHint}</a> (in which case the
       * value should be <code>{@value #AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DAY}</code>).
       *
       * <p>See {@link #setAutofillHints(String...)} for more info about autofill hints.
       */
      public static final String AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DAY = "creditCardExpirationDay";
  
      /**
       * Hints for the autofill services that describes the content of the view.
       */
      private @Nullable String[] mAutofillHints;
  
      /**
       * Autofill id, lazily created on calls to {@link #getAutofillId()}.
       */
      private AutofillId mAutofillId;
  
      /** @hide */
      @IntDef(prefix = { "AUTOFILL_TYPE_" }, value = {
              AUTOFILL_TYPE_NONE,
              AUTOFILL_TYPE_TEXT,
              AUTOFILL_TYPE_TOGGLE,
              AUTOFILL_TYPE_LIST,
              AUTOFILL_TYPE_DATE
      })
      @Retention(RetentionPolicy.SOURCE)
      public @interface AutofillType {}
  
      /**
       * Autofill type for views that cannot be autofilled.
       *
       * <p>Typically used when the view is read-only; for example, a text label.
       *
       * @see #getAutofillType()
       */
      public static final int AUTOFILL_TYPE_NONE = 0;
  
      /**
       * Autofill type for a text field, which is filled by a {@link CharSequence}.
       *
       * <p>{@link AutofillValue} instances for autofilling a {@link View} can be obtained through
       * {@link AutofillValue#forText(CharSequence)}, and the value passed to autofill a
       * {@link View} can be fetched through {@link AutofillValue#getTextValue()}.
       *
       * @see #getAutofillType()
       */
      public static final int AUTOFILL_TYPE_TEXT = 1;
  
      /**
       * Autofill type for a togglable field, which is filled by a {@code boolean}.
       *
       * <p>{@link AutofillValue} instances for autofilling a {@link View} can be obtained through
       * {@link AutofillValue#forToggle(boolean)}, and the value passed to autofill a
       * {@link View} can be fetched through {@link AutofillValue#getToggleValue()}.
       *
       * @see #getAutofillType()
       */
      public static final int AUTOFILL_TYPE_TOGGLE = 2;
  
      /**
       * Autofill type for a selection list field, which is filled by an {@code int}
       * representing the element index inside the list (starting at {@code 0}).
       *
       * <p>{@link AutofillValue} instances for autofilling a {@link View} can be obtained through
       * {@link AutofillValue#forList(int)}, and the value passed to autofill a
       * {@link View} can be fetched through {@link AutofillValue#getListValue()}.
       *
       * <p>The available options in the selection list are typically provided by
       * {@link android.app.assist.AssistStructure.ViewNode#getAutofillOptions()}.
       *
       * @see #getAutofillType()
       */
      public static final int AUTOFILL_TYPE_LIST = 3;
  
  
      /**
       * Autofill type for a field that contains a date, which is represented by a long representing
       * the number of milliseconds since the standard base time known as "the epoch", namely
       * January 1, 1970, 00:00:00 GMT (see {@link java.util.Date#getTime()}.
       *
       * <p>{@link AutofillValue} instances for autofilling a {@link View} can be obtained through
       * {@link AutofillValue#forDate(long)}, and the values passed to
       * autofill a {@link View} can be fetched through {@link AutofillValue#getDateValue()}.
       *
       * @see #getAutofillType()
       */
      public static final int AUTOFILL_TYPE_DATE = 4;
  
      /** @hide */
      @IntDef(prefix = { "IMPORTANT_FOR_AUTOFILL_" }, value = {
              IMPORTANT_FOR_AUTOFILL_AUTO,
              IMPORTANT_FOR_AUTOFILL_YES,
              IMPORTANT_FOR_AUTOFILL_NO,
              IMPORTANT_FOR_AUTOFILL_YES_EXCLUDE_DESCENDANTS,
              IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS
      })
      @Retention(RetentionPolicy.SOURCE)
      public @interface AutofillImportance {}
  
      /**
       * Automatically determine whether a view is important for autofill.
       *
       * @see #isImportantForAutofill()
       * @see #setImportantForAutofill(int)
       */
      public static final int IMPORTANT_FOR_AUTOFILL_AUTO = 0x0;
  
      /**
       * The view is important for autofill, and its children (if any) will be traversed.
       *
       * @see #isImportantForAutofill()
       * @see #setImportantForAutofill(int)
       */
      public static final int IMPORTANT_FOR_AUTOFILL_YES = 0x1;
  
      /**
       * The view is not important for autofill, but its children (if any) will be traversed.
       *
       * @see #isImportantForAutofill()
       * @see #setImportantForAutofill(int)
       */
      public static final int IMPORTANT_FOR_AUTOFILL_NO = 0x2;
  
      /**
       * The view is important for autofill, but its children (if any) will not be traversed.
       *
       * @see #isImportantForAutofill()
       * @see #setImportantForAutofill(int)
       */
      public static final int IMPORTANT_FOR_AUTOFILL_YES_EXCLUDE_DESCENDANTS = 0x4;
  
      /**
       * The view is not important for autofill, and its children (if any) will not be traversed.
       *
       * @see #isImportantForAutofill()
       * @see #setImportantForAutofill(int)
       */
      public static final int IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS = 0x8;
  
      /** @hide */
      @IntDef(flag = true, prefix = { "AUTOFILL_FLAG_" }, value = {
              AUTOFILL_FLAG_INCLUDE_NOT_IMPORTANT_VIEWS
      })
      @Retention(RetentionPolicy.SOURCE)
      public @interface AutofillFlags {}
  
      /**
       * Flag requesting you to add views that are marked as not important for autofill
       * (see {@link #setImportantForAutofill(int)}) to a {@link ViewStructure}.
       */
      public static final int AUTOFILL_FLAG_INCLUDE_NOT_IMPORTANT_VIEWS = 0x1;
  
      /** @hide */
      @IntDef(prefix = { "IMPORTANT_FOR_CONTENT_CAPTURE_" }, value = {
              IMPORTANT_FOR_CONTENT_CAPTURE_AUTO,
              IMPORTANT_FOR_CONTENT_CAPTURE_YES,
              IMPORTANT_FOR_CONTENT_CAPTURE_NO,
              IMPORTANT_FOR_CONTENT_CAPTURE_YES_EXCLUDE_DESCENDANTS,
              IMPORTANT_FOR_CONTENT_CAPTURE_NO_EXCLUDE_DESCENDANTS
      })
      @Retention(RetentionPolicy.SOURCE)
      public @interface ContentCaptureImportance {}
  
      /**
       * Automatically determine whether a view is important for content capture.
       *
       * @see #isImportantForContentCapture()
       * @see #setImportantForContentCapture(int)
       *
       * @hide
       */
      @TestApi
      public static final int IMPORTANT_FOR_CONTENT_CAPTURE_AUTO = 0x0;
  
      /**
       * The view is important for content capture, and its children (if any) will be traversed.
       *
       * @see #isImportantForContentCapture()
       * @see #setImportantForContentCapture(int)
       *
       * @hide
       */
      @TestApi
      public static final int IMPORTANT_FOR_CONTENT_CAPTURE_YES = 0x1;
  
      /**
       * The view is not important for content capture, but its children (if any) will be traversed.
       *
       * @see #isImportantForContentCapture()
       * @see #setImportantForContentCapture(int)
       *
       * @hide
       */
      @TestApi
      public static final int IMPORTANT_FOR_CONTENT_CAPTURE_NO = 0x2;
  
      /**
       * The view is important for content capture, but its children (if any) will not be traversed.
       *
       * @see #isImportantForContentCapture()
       * @see #setImportantForContentCapture(int)
       *
       * @hide
       */
      @TestApi
      public static final int IMPORTANT_FOR_CONTENT_CAPTURE_YES_EXCLUDE_DESCENDANTS = 0x4;
  
      /**
       * The view is not important for content capture, and its children (if any) will not be
       * traversed.
       *
       * @see #isImportantForContentCapture()
       * @see #setImportantForContentCapture(int)
       *
       * @hide
       */
      @TestApi
      public static final int IMPORTANT_FOR_CONTENT_CAPTURE_NO_EXCLUDE_DESCENDANTS = 0x8;
  
  
      /**
       * This view is enabled. Interpretation varies by subclass.
       * Use with ENABLED_MASK when calling setFlags.
       * {@hide}
       */
      static final int ENABLED = 0x00000000;
  
      /**
       * This view is disabled. Interpretation varies by subclass.
       * Use with ENABLED_MASK when calling setFlags.
       * {@hide}
       */
      static final int DISABLED = 0x00000020;
  
     /**
      * Mask for use with setFlags indicating bits used for indicating whether
      * this view is enabled
      * {@hide}
      */
      static final int ENABLED_MASK = 0x00000020;
  
      /**
       * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be
       * called and further optimizations will be performed. It is okay to have
       * this flag set and a background. Use with DRAW_MASK when calling setFlags.
       * {@hide}
       */
      static final int WILL_NOT_DRAW = 0x00000080;
  
      /**
       * Mask for use with setFlags indicating bits used for indicating whether
       * this view is will draw
       * {@hide}
       */
      static final int DRAW_MASK = 0x00000080;
  
      /**
       * <p>This view doesn't show scrollbars.</p>
       * {@hide}
       */
      static final int SCROLLBARS_NONE = 0x00000000;
  
      /**
       * <p>This view shows horizontal scrollbars.</p>
       * {@hide}
       */
      static final int SCROLLBARS_HORIZONTAL = 0x00000100;
  
      /**
       * <p>This view shows vertical scrollbars.</p>
       * {@hide}
       */
      static final int SCROLLBARS_VERTICAL = 0x00000200;
  
      /**
       * <p>Mask for use with setFlags indicating bits used for indicating which
       * scrollbars are enabled.</p>
       * {@hide}
       */
      static final int SCROLLBARS_MASK = 0x00000300;
  
      /**
       * Indicates that the view should filter touches when its window is obscured.
       * Refer to the class comments for more information about this security feature.
       * {@hide}
       */
      static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400;
  
      /**
       * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate
       * that they are optional and should be skipped if the window has
       * requested system UI flags that ignore those insets for layout.
       */
      static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800;
  
      /**
       * <p>This view doesn't show fading edges.</p>
       * {@hide}
       */
      static final int FADING_EDGE_NONE = 0x00000000;
  
      /**
       * <p>This view shows horizontal fading edges.</p>
       * {@hide}
       */
      static final int FADING_EDGE_HORIZONTAL = 0x00001000;
  
      /**
       * <p>This view shows vertical fading edges.</p>
       * {@hide}
       */
      static final int FADING_EDGE_VERTICAL = 0x00002000;
  
      /**
       * <p>Mask for use with setFlags indicating bits used for indicating which
       * fading edges are enabled.</p>
       * {@hide}
       */
      static final int FADING_EDGE_MASK = 0x00003000;
  
      /**
       * <p>Indicates this view can be clicked. When clickable, a View reacts
       * to clicks by notifying the OnClickListener.<p>
       * {@hide}
       */
      static final int CLICKABLE = 0x00004000;
  
      /**
       * <p>Indicates this view is caching its drawing into a bitmap.</p>
       * {@hide}
       */
      static final int DRAWING_CACHE_ENABLED = 0x00008000;
  
      /**
       * <p>Indicates that no icicle should be saved for this view.<p>
       * {@hide}
       */
      static final int SAVE_DISABLED = 0x000010000;
  
      /**
       * <p>Mask for use with setFlags indicating bits used for the saveEnabled
       * property.</p>
       * {@hide}
       */
      static final int SAVE_DISABLED_MASK = 0x000010000;
  
      /**
       * <p>Indicates that no drawing cache should ever be created for this view.<p>
       * {@hide}
       */
      static final int WILL_NOT_CACHE_DRAWING = 0x000020000;
  
      /**
       * <p>Indicates this view can take / keep focus when int touch mode.</p>
       * {@hide}
       */
      static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000;
  
      /** @hide */
      @Retention(RetentionPolicy.SOURCE)
      @IntDef(prefix = { "DRAWING_CACHE_QUALITY_" }, value = {
              DRAWING_CACHE_QUALITY_LOW,
              DRAWING_CACHE_QUALITY_HIGH,
              DRAWING_CACHE_QUALITY_AUTO
      })
      public @interface DrawingCacheQuality {}
  
      /**
       * <p>Enables low quality mode for the drawing cache.</p>
       *
       * @deprecated The view drawing cache was largely made obsolete with the introduction of
       * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache
       * layers are largely unnecessary and can easily result in a net loss in performance due to the
       * cost of creating and updating the layer. In the rare cases where caching layers are useful,
       * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware
       * rendering. For software-rendered snapshots of a small part of the View hierarchy or
       * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or
       * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these
       * software-rendered usages are discouraged and have compatibility issues with hardware-only
       * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE}
       * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback
       * reports or unit testing the {@link PixelCopy} API is recommended.
       */
      @Deprecated
      public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000;
  
      /**
       * <p>Enables high quality mode for the drawing cache.</p>
       *
       * @deprecated The view drawing cache was largely made obsolete with the introduction of
       * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache
       * layers are largely unnecessary and can easily result in a net loss in performance due to the
       * cost of creating and updating the layer. In the rare cases where caching layers are useful,
       * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware
       * rendering. For software-rendered snapshots of a small part of the View hierarchy or
       * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or
       * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these
       * software-rendered usages are discouraged and have compatibility issues with hardware-only
       * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE}
       * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback
       * reports or unit testing the {@link PixelCopy} API is recommended.
       */
      @Deprecated
      public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000;
  
      /**
       * <p>Enables automatic quality mode for the drawing cache.</p>
       *
       * @deprecated The view drawing cache was largely made obsolete with the introduction of
       * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache
       * layers are largely unnecessary and can easily result in a net loss in performance due to the
       * cost of creating and updating the layer. In the rare cases where caching layers are useful,
       * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware
       * rendering. For software-rendered snapshots of a small part of the View hierarchy or
       * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or
       * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these
       * software-rendered usages are discouraged and have compatibility issues with hardware-only
       * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE}
       * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback
       * reports or unit testing the {@link PixelCopy} API is recommended.
       */
      @Deprecated
      public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000;
  
      private static final int[] DRAWING_CACHE_QUALITY_FLAGS = {
              DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH
      };
  
      /**
       * <p>Mask for use with setFlags indicating bits used for the cache
       * quality property.</p>
       * {@hide}
       */
      static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000;
  
      /**
       * <p>
       * Indicates this view can be long clicked. When long clickable, a View
       * reacts to long clicks by notifying the OnLongClickListener or showing a
       * context menu.
       * </p>
       * {@hide}
       */
      static final int LONG_CLICKABLE = 0x00200000;
  
      /**
       * <p>Indicates that this view gets its drawable states from its direct parent
       * and ignores its original internal states.</p>
       *
       * @hide
       */
      static final int DUPLICATE_PARENT_STATE = 0x00400000;
  
      /**
       * <p>
       * Indicates this view can be context clicked. When context clickable, a View reacts to a
       * context click (e.g. a primary stylus button press or right mouse click) by notifying the
       * OnContextClickListener.
       * </p>
       * {@hide}
       */
      static final int CONTEXT_CLICKABLE = 0x00800000;
  
      /** @hide */
      @IntDef(prefix = { "SCROLLBARS_" }, value = {
              SCROLLBARS_INSIDE_OVERLAY,
              SCROLLBARS_INSIDE_INSET,
              SCROLLBARS_OUTSIDE_OVERLAY,
              SCROLLBARS_OUTSIDE_INSET
      })
      @Retention(RetentionPolicy.SOURCE)
      public @interface ScrollBarStyle {}
  
      /**
       * The scrollbar style to display the scrollbars inside the content area,
       * without increasing the padding. The scrollbars will be overlaid with
       * translucency on the view's content.
       */
      public static final int SCROLLBARS_INSIDE_OVERLAY = 0;
  
      /**
       * The scrollbar style to display the scrollbars inside the padded area,
       * increasing the padding of the view. The scrollbars will not overlap the
       * content area of the view.
       */
      public static final int SCROLLBARS_INSIDE_INSET = 0x01000000;
  
      /**
       * The scrollbar style to display the scrollbars at the edge of the view,
       * without increasing the padding. The scrollbars will be overlaid with
       * translucency.
       */
      public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000;
  
      /**
       * The scrollbar style to display the scrollbars at the edge of the view,
       * increasing the padding of the view. The scrollbars will only overlap the
       * background, if any.
       */
      public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000;
  
      /**
       * Mask to check if the scrollbar style is overlay or inset.
       * {@hide}
       */
      static final int SCROLLBARS_INSET_MASK = 0x01000000;
  
      /**
       * Mask to check if the scrollbar style is inside or outside.
       * {@hide}
       */
      static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000;
  
      /**
       * Mask for scrollbar style.
       * {@hide}
       */
      static final int SCROLLBARS_STYLE_MASK = 0x03000000;
  
      /**
       * View flag indicating that the screen should remain on while the
       * window containing this view is visible to the user.  This effectively
       * takes care of automatically setting the WindowManager's
       * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}.
       */
      public static final int KEEP_SCREEN_ON = 0x04000000;
  
      /**
       * View flag indicating whether this view should have sound effects enabled
       * for events such as clicking and touching.
       */
      public static final int SOUND_EFFECTS_ENABLED = 0x08000000;
  
      /**
       * View flag indicating whether this view should have haptic feedback
       * enabled for events such as long presses.
       */
      public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000;
  
      /**
       * <p>Indicates that the view hierarchy should stop saving state when
       * it reaches this view.  If state saving is initiated immediately at
       * the view, it will be allowed.
       * {@hide}
       */
      static final int PARENT_SAVE_DISABLED = 0x20000000;
  
      /**
       * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p>
       * {@hide}
       */
      static final int PARENT_SAVE_DISABLED_MASK = 0x20000000;
  
      private static Paint sDebugPaint;
  
      /**
       * <p>Indicates this view can display a tooltip on hover or long press.</p>
       * {@hide}
       */
      static final int TOOLTIP = 0x40000000;
  
      /** @hide */
      @IntDef(flag = true, prefix = { "FOCUSABLES_" }, value = {
              FOCUSABLES_ALL,
              FOCUSABLES_TOUCH_MODE
      })
      @Retention(RetentionPolicy.SOURCE)
      public @interface FocusableMode {}
  
      /**
       * View flag indicating whether {@link #addFocusables(ArrayList, int, int)}
       * should add all focusable Views regardless if they are focusable in touch mode.
       */
      public static final int FOCUSABLES_ALL = 0x00000000;
  
      /**
       * View flag indicating whether {@link #addFocusables(ArrayList, int, int)}
       * should add only Views focusable in touch mode.
       */
      public static final int FOCUSABLES_TOUCH_MODE = 0x00000001;
  
      /** @hide */
      @IntDef(prefix = { "FOCUS_" }, value = {
              FOCUS_BACKWARD,
              FOCUS_FORWARD,
              FOCUS_LEFT,
              FOCUS_UP,
              FOCUS_RIGHT,
              FOCUS_DOWN
      })
      @Retention(RetentionPolicy.SOURCE)
      public @interface FocusDirection {}
  
      /** @hide */
      @IntDef(prefix = { "FOCUS_" }, value = {
              FOCUS_LEFT,
              FOCUS_UP,
              FOCUS_RIGHT,
              FOCUS_DOWN
      })
      @Retention(RetentionPolicy.SOURCE)
      public @interface FocusRealDirection {} // Like @FocusDirection, but without forward/backward
  
      /**
       * Use with {@link #focusSearch(int)}. Move focus to the previous selectable
       * item.
       */
      public static final int FOCUS_BACKWARD = 0x00000001;
  
      /**
       * Use with {@link #focusSearch(int)}. Move focus to the next selectable
       * item.
       */
      public static final int FOCUS_FORWARD = 0x00000002;
  
      /**
       * Use with {@link #focusSearch(int)}. Move focus to the left.
       */
      public static final int FOCUS_LEFT = 0x00000011;
  
      /**
       * Use with {@link #focusSearch(int)}. Move focus up.
       */
      public static final int FOCUS_UP = 0x00000021;
  
      /**
       * Use with {@link #focusSearch(int)}. Move focus to the right.
       */
      public static final int FOCUS_RIGHT = 0x00000042;
  
      /**
       * Use with {@link #focusSearch(int)}. Move focus down.
       */
      public static final int FOCUS_DOWN = 0x00000082;
  
      /**
       * Bits of {@link #getMeasuredWidthAndState()} and
       * {@link #getMeasuredWidthAndState()} that provide the actual measured size.
       */
      public static final int MEASURED_SIZE_MASK = 0x00ffffff;
  
      /**
       * Bits of {@link #getMeasuredWidthAndState()} and
       * {@link #getMeasuredWidthAndState()} that provide the additional state bits.
       */
      public static final int MEASURED_STATE_MASK = 0xff000000;
  
      /**
       * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits
       * for functions that combine both width and height into a single int,
       * such as {@link #getMeasuredState()} and the childState argument of
       * {@link #resolveSizeAndState(int, int, int)}.
       */
      public static final int MEASURED_HEIGHT_STATE_SHIFT = 16;
  
      /**
       * Bit of {@link #getMeasuredWidthAndState()} and
       * {@link #getMeasuredWidthAndState()} that indicates the measured size
       * is smaller that the space the view would like to have.
       */
      public static final int MEASURED_STATE_TOO_SMALL = 0x01000000;
  
      /**
       * Base View state sets
       */
      // Singles
      /**
       * Indicates the view has no states set. States are used with
       * {@link android.graphics.drawable.Drawable} to change the drawing of the
       * view depending on its state.
       *
       * @see android.graphics.drawable.Drawable
       * @see #getDrawableState()
       */
      protected static final int[] EMPTY_STATE_SET;
      /**
       * Indicates the view is enabled. States are used with
       * {@link android.graphics.drawable.Drawable} to change the drawing of the
       * view depending on its state.
       *
       * @see android.graphics.drawable.Drawable
       * @see #getDrawableState()
       */
      protected static final int[] ENABLED_STATE_SET;
      /**
       * Indicates the view is focused. States are used with
       * {@link android.graphics.drawable.Drawable} to change the drawing of the
       * view depending on its state.
       *
       * @see android.graphics.drawable.Drawable
       * @see #getDrawableState()
       */
      protected static final int[] FOCUSED_STATE_SET;
      /**
       * Indicates the view is selected. States are used with
       * {@link android.graphics.drawable.Drawable} to change the drawing of the
       * view depending on its state.
       *
       * @see android.graphics.drawable.Drawable
       * @see #getDrawableState()
       */
      protected static final int[] SELECTED_STATE_SET;
      /**
       * Indicates the view is pressed. States are used with
       * {@link android.graphics.drawable.Drawable} to change the drawing of the
       * view depending on its state.
       *
       * @see android.graphics.drawable.Drawable
       * @see #getDrawableState()
       */
      protected static final int[] PRESSED_STATE_SET;
      /**
       * Indicates the view's window has focus. States are used with
       * {@link android.graphics.drawable.Drawable} to change the drawing of the
       * view depending on its state.
       *
       * @see android.graphics.drawable.Drawable
       * @see #getDrawableState()
       */
      protected static final int[] WINDOW_FOCUSED_STATE_SET;
      // Doubles
      /**
       * Indicates the view is enabled and has the focus.
       *
       * @see #ENABLED_STATE_SET
       * @see #FOCUSED_STATE_SET
       */
      protected static final int[] ENABLED_FOCUSED_STATE_SET;
      /**
       * Indicates the view is enabled and selected.
       *
       * @see #ENABLED_STATE_SET
       * @see #SELECTED_STATE_SET
       */
      protected static final int[] ENABLED_SELECTED_STATE_SET;
      /**
       * Indicates the view is enabled and that its window has focus.
       *
       * @see #ENABLED_STATE_SET
       * @see #WINDOW_FOCUSED_STATE_SET
       */
      protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET;
      /**
       * Indicates the view is focused and selected.
       *
       * @see #FOCUSED_STATE_SET
       * @see #SELECTED_STATE_SET
       */
      protected static final int[] FOCUSED_SELECTED_STATE_SET;
      /**
       * Indicates the view has the focus and that its window has the focus.
       *
       * @see #FOCUSED_STATE_SET
       * @see #WINDOW_FOCUSED_STATE_SET
       */
      protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET;
      /**
       * Indicates the view is selected and that its window has the focus.
       *
       * @see #SELECTED_STATE_SET
       * @see #WINDOW_FOCUSED_STATE_SET
       */
      protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET;
      // Triples
      /**
       * Indicates the view is enabled, focused and selected.
       *
       * @see #ENABLED_STATE_SET
       * @see #FOCUSED_STATE_SET
       * @see #SELECTED_STATE_SET
       */
      protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET;
      /**
       * Indicates the view is enabled, focused and its window has the focus.
       *
       * @see #ENABLED_STATE_SET
       * @see #FOCUSED_STATE_SET
       * @see #WINDOW_FOCUSED_STATE_SET
       */
      protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET;
      /**
       * Indicates the view is enabled, selected and its window has the focus.
       *
       * @see #ENABLED_STATE_SET
       * @see #SELECTED_STATE_SET
       * @see #WINDOW_FOCUSED_STATE_SET
       */
      protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET;
      /**
       * Indicates the view is focused, selected and its window has the focus.
       *
       * @see #FOCUSED_STATE_SET
       * @see #SELECTED_STATE_SET
       * @see #WINDOW_FOCUSED_STATE_SET
       */
      protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
      /**
       * Indicates the view is enabled, focused, selected and its window
       * has the focus.
       *
       * @see #ENABLED_STATE_SET
       * @see #FOCUSED_STATE_SET
       * @see #SELECTED_STATE_SET
       * @see #WINDOW_FOCUSED_STATE_SET
       */
      protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
      /**
       * Indicates the view is pressed and its window has the focus.
       *
       * @see #PRESSED_STATE_SET
       * @see #WINDOW_FOCUSED_STATE_SET
       */
      protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET;
      /**
       * Indicates the view is pressed and selected.
       *
       * @see #PRESSED_STATE_SET
       * @see #SELECTED_STATE_SET
       */
      protected static final int[] PRESSED_SELECTED_STATE_SET;
      /**
       * Indicates the view is pressed, selected and its window has the focus.
       *
       * @see #PRESSED_STATE_SET
       * @see #SELECTED_STATE_SET
       * @see #WINDOW_FOCUSED_STATE_SET
       */
      protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
      /**
       * Indicates the view is pressed and focused.
       *
       * @see #PRESSED_STATE_SET
       * @see #FOCUSED_STATE_SET
       */
      protected static final int[] PRESSED_FOCUSED_STATE_SET;
      /**
       * Indicates the view is pressed, focused and its window has the focus.
       *
       * @see #PRESSED_STATE_SET
       * @see #FOCUSED_STATE_SET
       * @see #WINDOW_FOCUSED_STATE_SET
       */
      protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET;
      /**
       * Indicates the view is pressed, focused and selected.
       *
       * @see #PRESSED_STATE_SET
       * @see #SELECTED_STATE_SET
       * @see #FOCUSED_STATE_SET
       */
      protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET;
      /**
       * Indicates the view is pressed, focused, selected and its window has the focus.
       *
       * @see #PRESSED_STATE_SET
       * @see #FOCUSED_STATE_SET
       * @see #SELECTED_STATE_SET
       * @see #WINDOW_FOCUSED_STATE_SET
       */
      protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
      /**
       * Indicates the view is pressed and enabled.
       *
       * @see #PRESSED_STATE_SET
       * @see #ENABLED_STATE_SET
       */
      protected static final int[] PRESSED_ENABLED_STATE_SET;
      /**
       * Indicates the view is pressed, enabled and its window has the focus.
       *
       * @see #PRESSED_STATE_SET
       * @see #ENABLED_STATE_SET
       * @see #WINDOW_FOCUSED_STATE_SET
       */
      protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET;
      /**
       * Indicates the view is pressed, enabled and selected.
       *
       * @see #PRESSED_STATE_SET
       * @see #ENABLED_STATE_SET
       * @see #SELECTED_STATE_SET
       */
      protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET;
      /**
       * Indicates the view is pressed, enabled, selected and its window has the
       * focus.
       *
       * @see #PRESSED_STATE_SET
       * @see #ENABLED_STATE_SET
       * @see #SELECTED_STATE_SET
       * @see #WINDOW_FOCUSED_STATE_SET
       */
      protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET;
      /**
       * Indicates the view is pressed, enabled and focused.
       *
       * @see #PRESSED_STATE_SET
       * @see #ENABLED_STATE_SET
       * @see #FOCUSED_STATE_SET
       */
      protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET;
      /**
       * Indicates the view is pressed, enabled, focused and its window has the
       * focus.
       *
       * @see #PRESSED_STATE_SET
       * @see #ENABLED_STATE_SET
       * @see #FOCUSED_STATE_SET
       * @see #WINDOW_FOCUSED_STATE_SET
       */
      protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET;
      /**
       * Indicates the view is pressed, enabled, focused and selected.
       *
       * @see #PRESSED_STATE_SET
       * @see #ENABLED_STATE_SET
       * @see #SELECTED_STATE_SET
       * @see #FOCUSED_STATE_SET
       */
      protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET;
      /**
       * Indicates the view is pressed, enabled, focused, selected and its window
       * has the focus.
       *
       * @see #PRESSED_STATE_SET
       * @see #ENABLED_STATE_SET
       * @see #SELECTED_STATE_SET
       * @see #FOCUSED_STATE_SET
       * @see #WINDOW_FOCUSED_STATE_SET
       */
      protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
  
      static {
          EMPTY_STATE_SET = StateSet.get(0);
  
          WINDOW_FOCUSED_STATE_SET = StateSet.get(StateSet.VIEW_STATE_WINDOW_FOCUSED);
  
          SELECTED_STATE_SET = StateSet.get(StateSet.VIEW_STATE_SELECTED);
          SELECTED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_SELECTED);
  
          FOCUSED_STATE_SET = StateSet.get(StateSet.VIEW_STATE_FOCUSED);
          FOCUSED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_FOCUSED);
          FOCUSED_SELECTED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_SELECTED | StateSet.VIEW_STATE_FOCUSED);
          FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_SELECTED
                          | StateSet.VIEW_STATE_FOCUSED);
  
          ENABLED_STATE_SET = StateSet.get(StateSet.VIEW_STATE_ENABLED);
          ENABLED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_ENABLED);
          ENABLED_SELECTED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_SELECTED | StateSet.VIEW_STATE_ENABLED);
          ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_SELECTED
                          | StateSet.VIEW_STATE_ENABLED);
          ENABLED_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_FOCUSED | StateSet.VIEW_STATE_ENABLED);
          ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_FOCUSED
                          | StateSet.VIEW_STATE_ENABLED);
          ENABLED_FOCUSED_SELECTED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_SELECTED | StateSet.VIEW_STATE_FOCUSED
                          | StateSet.VIEW_STATE_ENABLED);
          ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_SELECTED
                          | StateSet.VIEW_STATE_FOCUSED| StateSet.VIEW_STATE_ENABLED);
  
          PRESSED_STATE_SET = StateSet.get(StateSet.VIEW_STATE_PRESSED);
          PRESSED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_PRESSED);
          PRESSED_SELECTED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_SELECTED | StateSet.VIEW_STATE_PRESSED);
          PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_SELECTED
                          | StateSet.VIEW_STATE_PRESSED);
          PRESSED_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_FOCUSED | StateSet.VIEW_STATE_PRESSED);
          PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_FOCUSED
                          | StateSet.VIEW_STATE_PRESSED);
          PRESSED_FOCUSED_SELECTED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_SELECTED | StateSet.VIEW_STATE_FOCUSED
                          | StateSet.VIEW_STATE_PRESSED);
          PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_SELECTED
                          | StateSet.VIEW_STATE_FOCUSED | StateSet.VIEW_STATE_PRESSED);
          PRESSED_ENABLED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_ENABLED | StateSet.VIEW_STATE_PRESSED);
          PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_ENABLED
                          | StateSet.VIEW_STATE_PRESSED);
          PRESSED_ENABLED_SELECTED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_SELECTED | StateSet.VIEW_STATE_ENABLED
                          | StateSet.VIEW_STATE_PRESSED);
          PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_SELECTED
                          | StateSet.VIEW_STATE_ENABLED | StateSet.VIEW_STATE_PRESSED);
          PRESSED_ENABLED_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_FOCUSED | StateSet.VIEW_STATE_ENABLED
                          | StateSet.VIEW_STATE_PRESSED);
          PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_FOCUSED
                          | StateSet.VIEW_STATE_ENABLED | StateSet.VIEW_STATE_PRESSED);
          PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_SELECTED | StateSet.VIEW_STATE_FOCUSED
                          | StateSet.VIEW_STATE_ENABLED | StateSet.VIEW_STATE_PRESSED);
          PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
                  StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_SELECTED
                          | StateSet.VIEW_STATE_FOCUSED| StateSet.VIEW_STATE_ENABLED
                          | StateSet.VIEW_STATE_PRESSED);
      }
  
      /**
       * Accessibility event types that are dispatched for text population.
       */
      private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES =
              AccessibilityEvent.TYPE_VIEW_CLICKED
              | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED
              | AccessibilityEvent.TYPE_VIEW_SELECTED
              | AccessibilityEvent.TYPE_VIEW_FOCUSED
              | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED
              | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER
              | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT
              | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED
              | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED
              | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED
              | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY;
  
      static final int DEBUG_CORNERS_COLOR = Color.rgb(63, 127, 255);
  
      static final int DEBUG_CORNERS_SIZE_DIP = 8;
  
      /**
       * Temporary Rect currently for use in setBackground().  This will probably
       * be extended in the future to hold our own class with more than just
       * a Rect. :)
       */
      static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>();
  
      /**
       * Map used to store views' tags.
       */
      @UnsupportedAppUsage
      private SparseArray<Object> mKeyedTags;
  
      /**
       * The next available accessibility id.
       */
      private static int sNextAccessibilityViewId;
  
      /**
       * The animation currently associated with this view.
       * @hide
       */
      protected Animation mCurrentAnimation = null;
  
      /**
       * Width as measured during measure pass.
       * {@hide}
       */
      @ViewDebug.ExportedProperty(category = "measurement")
      @UnsupportedAppUsage
      int mMeasuredWidth;
  
      /**
       * Height as measured during measure pass.
       * {@hide}
       */
      @ViewDebug.ExportedProperty(category = "measurement")
      @UnsupportedAppUsage
      int mMeasuredHeight;
  
      /**
       * Flag to indicate that this view was marked INVALIDATED, or had its display list
       * invalidated, prior to the current drawing iteration. If true, the view must re-draw
       * its display list. This flag, used only when hw accelerated, allows us to clear the
       * flag while retaining this information until it's needed (at getDisplayList() time and
       * in drawChild(), when we decide to draw a view's children's display lists into our own).
       *
       * {@hide}
       */
      @UnsupportedAppUsage
      boolean mRecreateDisplayList = false;
  
      /**
       * The view's identifier.
       * {@hide}
       *
       * @see #setId(int)
       * @see #getId()
       */
      @IdRes
      @ViewDebug.ExportedProperty(resolveId = true)
      int mID = NO_ID;
  
      /** The ID of this view for autofill purposes.
       * <ul>
       *     <li>== {@link #NO_ID}: ID has not been assigned yet
       *     <li>&le; {@link #LAST_APP_AUTOFILL_ID}: View is not part of a activity. The ID is
       *                                                  unique in the process. This might change
       *                                                  over activity lifecycle events.
       *     <li>&gt; {@link #LAST_APP_AUTOFILL_ID}: View is part of a activity. The ID is
       *                                                  unique in the activity. This stays the same
       *                                                  over activity lifecycle events.
       */
      private int mAutofillViewId = NO_ID;
  
      // ID for accessibility purposes. This ID must be unique for every window
      @UnsupportedAppUsage
      private int mAccessibilityViewId = NO_ID;
  
      private int mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED;
  
      /**
       * The view's tag.
       * {@hide}
       *
       * @see #setTag(Object)
       * @see #getTag()
       */
      @UnsupportedAppUsage
      protected Object mTag = null;
  
      /*
       * Masks for mPrivateFlags, as generated by dumpFlags():
       *
       * |-------|-------|-------|-------|
       *                                 1 PFLAG_WANTS_FOCUS
       *                                1  PFLAG_FOCUSED
       *                               1   PFLAG_SELECTED
       *                              1    PFLAG_IS_ROOT_NAMESPACE
       *                             1     PFLAG_HAS_BOUNDS
       *                            1      PFLAG_DRAWN
       *                           1       PFLAG_DRAW_ANIMATION
       *                          1        PFLAG_SKIP_DRAW
       *                        1          PFLAG_REQUEST_TRANSPARENT_REGIONS
       *                       1           PFLAG_DRAWABLE_STATE_DIRTY
       *                      1            PFLAG_MEASURED_DIMENSION_SET
       *                     1             PFLAG_FORCE_LAYOUT
       *                    1              PFLAG_LAYOUT_REQUIRED
       *                   1               PFLAG_PRESSED
       *                  1                PFLAG_DRAWING_CACHE_VALID
       *                 1                 PFLAG_ANIMATION_STARTED
       *                1                  PFLAG_SAVE_STATE_CALLED
       *               1                   PFLAG_ALPHA_SET
       *              1                    PFLAG_SCROLL_CONTAINER
       *             1                     PFLAG_SCROLL_CONTAINER_ADDED
       *            1                      PFLAG_DIRTY
       *            1                      PFLAG_DIRTY_MASK
       *          1                        PFLAG_OPAQUE_BACKGROUND
       *         1                         PFLAG_OPAQUE_SCROLLBARS
       *         11                        PFLAG_OPAQUE_MASK
       *        1                          PFLAG_PREPRESSED
       *       1                           PFLAG_CANCEL_NEXT_UP_EVENT
       *      1                            PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH
       *     1                             PFLAG_HOVERED
       *    1                              PFLAG_NOTIFY_AUTOFILL_MANAGER_ON_CLICK
       *   1                               PFLAG_ACTIVATED
       *  1                                PFLAG_INVALIDATED
       * |-------|-------|-------|-------|
       */
      /** {@hide} */
      static final int PFLAG_WANTS_FOCUS                 = 0x00000001;
      /** {@hide} */
      static final int PFLAG_FOCUSED                     = 0x00000002;
      /** {@hide} */
      static final int PFLAG_SELECTED                    = 0x00000004;
      /** {@hide} */
      static final int PFLAG_IS_ROOT_NAMESPACE           = 0x00000008;
      /** {@hide} */
      static final int PFLAG_HAS_BOUNDS                  = 0x00000010;
      /** {@hide} */
      static final int PFLAG_DRAWN                       = 0x00000020;
      /**
       * When this flag is set, this view is running an animation on behalf of its
       * children and should therefore not cancel invalidate requests, even if they
       * lie outside of this view's bounds.
       *
       * {@hide}
       */
      static final int PFLAG_DRAW_ANIMATION              = 0x00000040;
      /** {@hide} */
      static final int PFLAG_SKIP_DRAW                   = 0x00000080;
      /** {@hide} */
      static final int PFLAG_REQUEST_TRANSPARENT_REGIONS = 0x00000200;
      /** {@hide} */
      static final int PFLAG_DRAWABLE_STATE_DIRTY        = 0x00000400;
      /** {@hide} */
      static final int PFLAG_MEASURED_DIMENSION_SET      = 0x00000800;
      /** {@hide} */
      static final int PFLAG_FORCE_LAYOUT                = 0x00001000;
      /** {@hide} */
      static final int PFLAG_LAYOUT_REQUIRED             = 0x00002000;
  
      private static final int PFLAG_PRESSED             = 0x00004000;
  
      /** {@hide} */
      static final int PFLAG_DRAWING_CACHE_VALID         = 0x00008000;
      /**
       * Flag used to indicate that this view should be drawn once more (and only once
       * more) after its animation has completed.
       * {@hide}
       */
      static final int PFLAG_ANIMATION_STARTED           = 0x00010000;
  
      private static final int PFLAG_SAVE_STATE_CALLED   = 0x00020000;
  
      /**
       * Indicates that the View returned true when onSetAlpha() was called and that
       * the alpha must be restored.
       * {@hide}
       */
      static final int PFLAG_ALPHA_SET                   = 0x00040000;
  
      /**
       * Set by {@link #setScrollContainer(boolean)}.
       */
      static final int PFLAG_SCROLL_CONTAINER            = 0x00080000;
  
      /**
       * Set by {@link #setScrollContainer(boolean)}.
       */
      static final int PFLAG_SCROLL_CONTAINER_ADDED      = 0x00100000;
  
      /**
       * View flag indicating whether this view was invalidated (fully or partially.)
       *
       * @hide
       */
      static final int PFLAG_DIRTY                       = 0x00200000;
  
      /**
       * Mask for {@link #PFLAG_DIRTY}.
       *
       * @hide
       */
      static final int PFLAG_DIRTY_MASK                  = 0x00200000;
  
      /**
       * Indicates whether the background is opaque.
       *
       * @hide
       */
      static final int PFLAG_OPAQUE_BACKGROUND           = 0x00800000;
  
      /**
       * Indicates whether the scrollbars are opaque.
       *
       * @hide
       */
      static final int PFLAG_OPAQUE_SCROLLBARS           = 0x01000000;
  
      /**
       * Indicates whether the view is opaque.
       *
       * @hide
       */
      static final int PFLAG_OPAQUE_MASK                 = 0x01800000;
  
      /**
       * Indicates a prepressed state;
       * the short time between ACTION_DOWN and recognizing
       * a 'real' press. Prepressed is used to recognize quick taps
       * even when they are shorter than ViewConfiguration.getTapTimeout().
       *
       * @hide
       */
      private static final int PFLAG_PREPRESSED          = 0x02000000;
  
      /**
       * Indicates whether the view is temporarily detached.
       *
       * @hide
       */
      static final int PFLAG_CANCEL_NEXT_UP_EVENT        = 0x04000000;
  
      /**
       * Indicates that we should awaken scroll bars once attached
       *
       * PLEASE NOTE: This flag is now unused as we now send onVisibilityChanged
       * during window attachment and it is no longer needed. Feel free to repurpose it.
       *
       * @hide
       */
      private static final int PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000;
  
      /**
       * Indicates that the view has received HOVER_ENTER.  Cleared on HOVER_EXIT.
       * @hide
       */
      private static final int PFLAG_HOVERED             = 0x10000000;
  
      /**
       * Flag set by {@link AutofillManager} if it needs to be notified when this view is clicked.
       */
      private static final int PFLAG_NOTIFY_AUTOFILL_MANAGER_ON_CLICK = 0x20000000;
  
      /** {@hide} */
      static final int PFLAG_ACTIVATED                   = 0x40000000;
  
      /**
       * Indicates that this view was specifically invalidated, not just dirtied because some
       * child view was invalidated. The flag is used to determine when we need to recreate
       * a view's display list (as opposed to just returning a reference to its existing
       * display list).
       *
       * @hide
       */
      static final int PFLAG_INVALIDATED                 = 0x80000000;
  
      /* End of masks for mPrivateFlags */
  
      /*
       * Masks for mPrivateFlags2, as generated by dumpFlags():
       *
       * |-------|-------|-------|-------|
       *                                 1 PFLAG2_DRAG_CAN_ACCEPT
       *                                1  PFLAG2_DRAG_HOVERED
       *                              11   PFLAG2_LAYOUT_DIRECTION_MASK
       *                             1     PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL
       *                            1      PFLAG2_LAYOUT_DIRECTION_RESOLVED
       *                            11     PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK
       *                           1       PFLAG2_TEXT_DIRECTION_FLAGS[1]
       *                          1        PFLAG2_TEXT_DIRECTION_FLAGS[2]
       *                          11       PFLAG2_TEXT_DIRECTION_FLAGS[3]
       *                         1         PFLAG2_TEXT_DIRECTION_FLAGS[4]
       *                         1 1       PFLAG2_TEXT_DIRECTION_FLAGS[5]
       *                         11        PFLAG2_TEXT_DIRECTION_FLAGS[6]
       *                         111       PFLAG2_TEXT_DIRECTION_FLAGS[7]
       *                         111       PFLAG2_TEXT_DIRECTION_MASK
       *                        1          PFLAG2_TEXT_DIRECTION_RESOLVED
       *                       1           PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT
       *                     111           PFLAG2_TEXT_DIRECTION_RESOLVED_MASK
       *                    1              PFLAG2_TEXT_ALIGNMENT_FLAGS[1]
       *                   1               PFLAG2_TEXT_ALIGNMENT_FLAGS[2]
       *                   11              PFLAG2_TEXT_ALIGNMENT_FLAGS[3]
       *                  1                PFLAG2_TEXT_ALIGNMENT_FLAGS[4]
       *                  1 1              PFLAG2_TEXT_ALIGNMENT_FLAGS[5]
       *                  11               PFLAG2_TEXT_ALIGNMENT_FLAGS[6]
       *                  111              PFLAG2_TEXT_ALIGNMENT_MASK
       *                 1                 PFLAG2_TEXT_ALIGNMENT_RESOLVED
       *                1                  PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT
       *              111                  PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK
       *           111                     PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK
       *         11                        PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK
       *       1                           PFLAG2_ACCESSIBILITY_FOCUSED
       *      1                            PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED
       *     1                             PFLAG2_VIEW_QUICK_REJECTED
       *    1                              PFLAG2_PADDING_RESOLVED
       *   1                               PFLAG2_DRAWABLE_RESOLVED
       *  1                                PFLAG2_HAS_TRANSIENT_STATE
       * |-------|-------|-------|-------|
       */
  
      /**
       * Indicates that this view has reported that it can accept the current drag's content.
       * Cleared when the drag operation concludes.
       * @hide
       */
      static final int PFLAG2_DRAG_CAN_ACCEPT            = 0x00000001;
  
      /**
       * Indicates that this view is currently directly under the drag location in a
       * drag-and-drop operation involving content that it can accept.  Cleared when
       * the drag exits the view, or when the drag operation concludes.
       * @hide
       */
      static final int PFLAG2_DRAG_HOVERED               = 0x00000002;
  
      /** @hide */
      @IntDef(prefix = { "LAYOUT_DIRECTION_" }, value = {
              LAYOUT_DIRECTION_LTR,
              LAYOUT_DIRECTION_RTL,
              LAYOUT_DIRECTION_INHERIT,
              LAYOUT_DIRECTION_LOCALE
      })
      @Retention(RetentionPolicy.SOURCE)
      // Not called LayoutDirection to avoid conflict with android.util.LayoutDirection
      public @interface LayoutDir {}
  
      /** @hide */
      @IntDef(prefix = { "LAYOUT_DIRECTION_" }, value = {
              LAYOUT_DIRECTION_LTR,
              LAYOUT_DIRECTION_RTL
      })
      @Retention(RetentionPolicy.SOURCE)
      public @interface ResolvedLayoutDir {}
  
      /**
       * A flag to indicate that the layout direction of this view has not been defined yet.
       * @hide
       */
      public static final int LAYOUT_DIRECTION_UNDEFINED = LayoutDirection.UNDEFINED;
  
      /**
       * Horizontal layout direction of this view is from Left to Right.
       * Use with {@link #setLayoutDirection}.
       */
      public static final int LAYOUT_DIRECTION_LTR = LayoutDirection.LTR;
  
      /**
       * Horizontal layout direction of this view is from Right to Left.
       * Use with {@link #setLayoutDirection}.
       */
      public static final int LAYOUT_DIRECTION_RTL = LayoutDirection.RTL;
  
      /**
       * Horizontal layout direction of this view is inherited from its parent.
       * Use with {@link #setLayoutDirection}.
       */
      public static final int LAYOUT_DIRECTION_INHERIT = LayoutDirection.INHERIT;
  
      /**
       * Horizontal layout direction of this view is from deduced from the default language
       * script for the locale. Use with {@link #setLayoutDirection}.
       */
      public static final int LAYOUT_DIRECTION_LOCALE = LayoutDirection.LOCALE;
  
      /**
       * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED)
       * @hide
       */
      static final int PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT = 2;
  
      /**
       * Mask for use with private flags indicating bits used for horizontal layout direction.
       * @hide
       */
      static final int PFLAG2_LAYOUT_DIRECTION_MASK = 0x00000003 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;
  
      /**
       * Indicates whether the view horizontal layout direction has been resolved and drawn to the
       * right-to-left direction.
       * @hide
       */
      static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL = 4 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;
  
      /**
       * Indicates whether the view horizontal layout direction has been resolved.
       * @hide
       */
      static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED = 8 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;
  
      /**
       * Mask for use with private flags indicating bits used for resolved horizontal layout direction.
       * @hide
       */
      static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C
              << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;
  
      /*
       * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct
       * flag value.
       * @hide
       */
      private static final int[] LAYOUT_DIRECTION_FLAGS = {
              LAYOUT_DIRECTION_LTR,
              LAYOUT_DIRECTION_RTL,
              LAYOUT_DIRECTION_INHERIT,
              LAYOUT_DIRECTION_LOCALE
      };
  
      /**
       * Default horizontal layout direction.
       */
      private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT;
  
      /**
       * Default horizontal layout direction.
       * @hide
       */
      static final int LAYOUT_DIRECTION_RESOLVED_DEFAULT = LAYOUT_DIRECTION_LTR;
  
      /**
       * Text direction is inherited through {@link ViewGroup}
       */
      public static final int TEXT_DIRECTION_INHERIT = 0;
  
      /**
       * Text direction is using "first strong algorithm". The first strong directional character
       * determines the paragraph direction. If there is no strong directional character, the
       * paragraph direction is the view's resolved layout direction.
       */
      public static final int TEXT_DIRECTION_FIRST_STRONG = 1;
  
      /**
       * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains
       * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters.
       * If there are neither, the paragraph direction is the view's resolved layout direction.
       */
      public static final int TEXT_DIRECTION_ANY_RTL = 2;
  
      /**
       * Text direction is forced to LTR.
       */
      public static final int TEXT_DIRECTION_LTR = 3;
  
      /**
       * Text direction is forced to RTL.
       */
      public static final int TEXT_DIRECTION_RTL = 4;
  
      /**
       * Text direction is coming from the system Locale.
       */
      public static final int TEXT_DIRECTION_LOCALE = 5;
  
      /**
       * Text direction is using "first strong algorithm". The first strong directional character
       * determines the paragraph direction. If there is no strong directional character, the
       * paragraph direction is LTR.
       */
      public static final int TEXT_DIRECTION_FIRST_STRONG_LTR = 6;
  
      /**
       * Text direction is using "first strong algorithm". The first strong directional character
       * determines the paragraph direction. If there is no strong directional character, the
       * paragraph direction is RTL.
       */
      public static final int TEXT_DIRECTION_FIRST_STRONG_RTL = 7;
  
      /**
       * Default text direction is inherited
       */
      private static final int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT;
  
      /**
       * Default resolved text direction
       * @hide
       */
      static final int TEXT_DIRECTION_RESOLVED_DEFAULT = TEXT_DIRECTION_FIRST_STRONG;
  
      /**
       * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED)
       * @hide
       */
      static final int PFLAG2_TEXT_DIRECTION_MASK_SHIFT = 6;
  
      /**
       * Mask for use with private flags indicating bits used for text direction.
       * @hide
       */
      static final int PFLAG2_TEXT_DIRECTION_MASK = 0x00000007
              << PFLAG2_TEXT_DIRECTION_MASK_SHIFT;
  
      /**
       * Array of text direction flags for mapping attribute "textDirection" to correct
       * flag value.
       * @hide
       */
      private static final int[] PFLAG2_TEXT_DIRECTION_FLAGS = {
              TEXT_DIRECTION_INHERIT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
              TEXT_DIRECTION_FIRST_STRONG << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
              TEXT_DIRECTION_ANY_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
              TEXT_DIRECTION_LTR << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
              TEXT_DIRECTION_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
              TEXT_DIRECTION_LOCALE << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
              TEXT_DIRECTION_FIRST_STRONG_LTR << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
              TEXT_DIRECTION_FIRST_STRONG_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT
      };
  
      /**
       * Indicates whether the view text direction has been resolved.
       * @hide
       */
      static final int PFLAG2_TEXT_DIRECTION_RESOLVED = 0x00000008
              << PFLAG2_TEXT_DIRECTION_MASK_SHIFT;
  
      /**
       * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED)
       * @hide
       */
      static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10;
  
      /**
       * Mask for use with private flags indicating bits used for resolved text direction.
       * @hide
       */
      static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK = 0x00000007
              << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT;
  
      /**
       * Indicates whether the view text direction has been resolved to the "first strong" heuristic.
       * @hide
       */
      static final int PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT =
              TEXT_DIRECTION_RESOLVED_DEFAULT << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT;
  
      /** @hide */
      @IntDef(prefix = { "TEXT_ALIGNMENT_" }, value = {
              TEXT_ALIGNMENT_INHERIT,
              TEXT_ALIGNMENT_GRAVITY,
              TEXT_ALIGNMENT_CENTER,
              TEXT_ALIGNMENT_TEXT_START,
              TEXT_ALIGNMENT_TEXT_END,
              TEXT_ALIGNMENT_VIEW_START,
              TEXT_ALIGNMENT_VIEW_END
      })
      @Retention(RetentionPolicy.SOURCE)
      public @interface TextAlignment {}
  
      /**
       * Default text alignment. The text alignment of this View is inherited from its parent.
       * Use with {@link #setTextAlignment(int)}
       */
      public static final int TEXT_ALIGNMENT_INHERIT = 0;
  
      /**
       * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL,
       * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph's text direction.
       *
       * Use with {@link #setTextAlignment(int)}
       */
      public static final int TEXT_ALIGNMENT_GRAVITY = 1;
  
      /**
       * Align to the start of the paragraph, e.g. ALIGN_NORMAL.
       *
       * Use with {@link #setTextAlignment(int)}
       */
      public static final int TEXT_ALIGNMENT_TEXT_START = 2;
  
      /**
       * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE.
       *
       * Use with {@link #setTextAlignment(int)}
       */
      public static final int TEXT_ALIGNMENT_TEXT_END = 3;
  
      /**
       * Center the paragraph, e.g. ALIGN_CENTER.
       *
       * Use with {@link #setTextAlignment(int)}
       */
      public static final int TEXT_ALIGNMENT_CENTER = 4;
  
      /**
       * Align to the start of the view, which is ALIGN_LEFT if the view's resolved
       * layoutDirection is LTR, and ALIGN_RIGHT otherwise.
       *
       * Use with {@link #setTextAlignment(int)}
       */
      public static final int TEXT_ALIGNMENT_VIEW_START = 5;
  
      /**
       * Align to the end of the view, which is ALIGN_RIGHT if the view's resolved
       * layoutDirection is LTR, and ALIGN_LEFT otherwise.
       *
       * Use with {@link #setTextAlignment(int)}
       */
      public static final int TEXT_ALIGNMENT_VIEW_END = 6;
  
      /**
       * Default text alignment is inherited
       */
      private static final int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY;
  
      /**
       * Default resolved text alignment
       * @hide
       */
      static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = TEXT_ALIGNMENT_GRAVITY;
  
      /**
        * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED)
        * @hide
        */
      static final int PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT = 13;
  
      /**
        * Mask for use with private flags indicating bits used for text alignment.
        * @hide
        */
      static final int PFLAG2_TEXT_ALIGNMENT_MASK = 0x00000007 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT;
  
      /**
       * Array of text direction flags for mapping attribute "textAlignment" to correct
       * flag value.
       * @hide
       */
      private static final int[] PFLAG2_TEXT_ALIGNMENT_FLAGS = {
              TEXT_ALIGNMENT_INHERIT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
              TEXT_ALIGNMENT_GRAVITY << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
              TEXT_ALIGNMENT_TEXT_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
              TEXT_ALIGNMENT_TEXT_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
              TEXT_ALIGNMENT_CENTER << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
              TEXT_ALIGNMENT_VIEW_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
              TEXT_ALIGNMENT_VIEW_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT
      };
  
      /**
       * Indicates whether the view text alignment has been resolved.
       * @hide
       */
      static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED = 0x00000008 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT;
  
      /**
       * Bit shift to get the resolved text alignment.
       * @hide
       */
      static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17;
  
      /**
       * Mask for use with private flags indicating bits used for text alignment.
       * @hide
       */
      static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007
              << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT;
  
      /**
       * Indicates whether if the view text alignment has been resolved to gravity
       */
      private static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT =
              TEXT_ALIGNMENT_RESOLVED_DEFAULT << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT;
  
      // Accessiblity constants for mPrivateFlags2
  
      /**
       * Shift for the bits in {@link #mPrivateFlags2} related to the
       * "importantForAccessibility" attribute.
       */
      static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20;
  
      /**
       * Automatically determine whether a view is important for accessibility.
       */
      public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000;
  
      /**
       * The view is important for accessibility.
       */
      public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001;
  
      /**
       * The view is not important for accessibility.
       */
      public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002;
  
      /**
       * The view is not important for accessibility, nor are any of its
       * descendant views.
       */
      public static final int IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS = 0x00000004;
  
      /**
       * The default whether the view is important for accessibility.
       */
      static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO;
  
      /**
       * Mask for obtaining the bits which specify how to determine
       * whether a view is important for accessibility.
       */
      static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO
          | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO
          | IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS)
          << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT;
  
      /**
       * Shift for the bits in {@link #mPrivateFlags2} related to the
       * "accessibilityLiveRegion" attribute.
       */
      static final int PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT = 23;
  
      /**
       * Live region mode specifying that accessibility services should not
       * automatically announce changes to this view. This is the default live
       * region mode for most views.
       * <p>
       * Use with {@link #setAccessibilityLiveRegion(int)}.
       */
      public static final int ACCESSIBILITY_LIVE_REGION_NONE = 0x00000000;
  
      /**
       * Live region mode specifying that accessibility services should announce
       * changes to this view.
       * <p>
       * Use with {@link #setAccessibilityLiveRegion(int)}.
       */
      public static final int ACCESSIBILITY_LIVE_REGION_POLITE = 0x00000001;
  
      /**
       * Live region mode specifying that accessibility services should interrupt
       * ongoing speech to immediately announce changes to this view.
       * <p>
       * Use with {@link #setAccessibilityLiveRegion(int)}.
       */
      public static final int ACCESSIBILITY_LIVE_REGION_ASSERTIVE = 0x00000002;
  
      /**
       * The default whether the view is important for accessibility.
       */
      static final int ACCESSIBILITY_LIVE_REGION_DEFAULT = ACCESSIBILITY_LIVE_REGION_NONE;
  
      /**
       * Mask for obtaining the bits which specify a view's accessibility live
       * region mode.
       */
      static final int PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK = (ACCESSIBILITY_LIVE_REGION_NONE
              | ACCESSIBILITY_LIVE_REGION_POLITE | ACCESSIBILITY_LIVE_REGION_ASSERTIVE)
              << PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT;
  
      /**
       * Flag indicating whether a view has accessibility focus.
       */
      static final int PFLAG2_ACCESSIBILITY_FOCUSED = 0x04000000;
  
      /**
       * Flag whether the accessibility state of the subtree rooted at this view changed.
       */
      static final int PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED = 0x08000000;
  
      /**
       * Flag indicating whether a view failed the quickReject() check in draw(). This condition
       * is used to check whether later changes to the view's transform should invalidate the
       * view to force the quickReject test to run again.
       */
      static final int PFLAG2_VIEW_QUICK_REJECTED = 0x10000000;
  
      /**
       * Flag indicating that start/end padding has been resolved into left/right padding
       * for use in measurement, layout, drawing, etc. This is set by {@link #resolvePadding()}
       * and checked by {@link #measure(int, int)} to determine if padding needs to be resolved
       * during measurement. In some special cases this is required such as when an adapter-based
       * view measures prospective children without attaching them to a window.
       */
      static final int PFLAG2_PADDING_RESOLVED = 0x20000000;
  
      /**
       * Flag indicating that the start/end drawables has been resolved into left/right ones.
       */
      static final int PFLAG2_DRAWABLE_RESOLVED = 0x40000000;
  
      /**
       * Indicates that the view is tracking some sort of transient state
       * that the app should not need to be aware of, but that the framework
       * should take special care to preserve.
       */
      static final int PFLAG2_HAS_TRANSIENT_STATE = 0x80000000;
  
      /**
       * Group of bits indicating that RTL properties resolution is done.
       */
      static final int ALL_RTL_PROPERTIES_RESOLVED = PFLAG2_LAYOUT_DIRECTION_RESOLVED |
              PFLAG2_TEXT_DIRECTION_RESOLVED |
              PFLAG2_TEXT_ALIGNMENT_RESOLVED |
              PFLAG2_PADDING_RESOLVED |
              PFLAG2_DRAWABLE_RESOLVED;
  
      // There are a couple of flags left in mPrivateFlags2
  
      /* End of masks for mPrivateFlags2 */
  
      /*
       * Masks for mPrivateFlags3, as generated by dumpFlags():
       *
       * |-------|-------|-------|-------|
       *                                 1 PFLAG3_VIEW_IS_ANIMATING_TRANSFORM
       *                                1  PFLAG3_VIEW_IS_ANIMATING_ALPHA
       *                               1   PFLAG3_IS_LAID_OUT
       *                              1    PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT
       *                             1     PFLAG3_CALLED_SUPER
       *                            1      PFLAG3_APPLYING_INSETS
       *                           1       PFLAG3_FITTING_SYSTEM_WINDOWS
       *                          1        PFLAG3_NESTED_SCROLLING_ENABLED
       *                         1         PFLAG3_SCROLL_INDICATOR_TOP
       *                        1          PFLAG3_SCROLL_INDICATOR_BOTTOM
       *                       1           PFLAG3_SCROLL_INDICATOR_LEFT
       *                      1            PFLAG3_SCROLL_INDICATOR_RIGHT
       *                     1             PFLAG3_SCROLL_INDICATOR_START
       *                    1              PFLAG3_SCROLL_INDICATOR_END
       *                   1               PFLAG3_ASSIST_BLOCKED
       *                  1                PFLAG3_CLUSTER
       *                 1                 PFLAG3_IS_AUTOFILLED
       *                1                  PFLAG3_FINGER_DOWN
       *               1                   PFLAG3_FOCUSED_BY_DEFAULT
       *           1111                    PFLAG3_IMPORTANT_FOR_AUTOFILL
       *          1                        PFLAG3_OVERLAPPING_RENDERING_FORCED_VALUE
       *         1                         PFLAG3_HAS_OVERLAPPING_RENDERING_FORCED
       *        1                          PFLAG3_TEMPORARY_DETACH
       *       1                           PFLAG3_NO_REVEAL_ON_FOCUS
       *      1                            PFLAG3_NOTIFY_AUTOFILL_ENTER_ON_LAYOUT
       *     1                             PFLAG3_SCREEN_READER_FOCUSABLE
       *    1                              PFLAG3_AGGREGATED_VISIBLE
       *   1                               PFLAG3_AUTOFILLID_EXPLICITLY_SET
       *  1                                PFLAG3_ACCESSIBILITY_HEADING
       * |-------|-------|-------|-------|
       */
  
      /**
       * Flag indicating that view has a transform animation set on it. This is used to track whether
       * an animation is cleared between successive frames, in order to tell the associated
       * DisplayList to clear its animation matrix.
       */
      static final int PFLAG3_VIEW_IS_ANIMATING_TRANSFORM = 0x1;
  
      /**
       * Flag indicating that view has an alpha animation set on it. This is used to track whether an
       * animation is cleared between successive frames, in order to tell the associated
       * DisplayList to restore its alpha value.
       */
      static final int PFLAG3_VIEW_IS_ANIMATING_ALPHA = 0x2;
  
      /**
       * Flag indicating that the view has been through at least one layout since it
       * was last attached to a window.
       */
      static final int PFLAG3_IS_LAID_OUT = 0x4;
  
      /**
       * Flag indicating that a call to measure() was skipped and should be done
       * instead when layout() is invoked.
       */
      static final int PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT = 0x8;
  
      /**
       * Flag indicating that an overridden method correctly called down to
       * the superclass implementation as required by the API spec.
       */
      static final int PFLAG3_CALLED_SUPER = 0x10;
  
      /**
       * Flag indicating that we're in the process of applying window insets.
       */
      static final int PFLAG3_APPLYING_INSETS = 0x20;
  
      /**
       * Flag indicating that we're in the process of fitting system windows using the old method.
       */
      static final int PFLAG3_FITTING_SYSTEM_WINDOWS = 0x40;
  
      /**
       * Flag indicating that nested scrolling is enabled for this view.
       * The view will optionally cooperate with views up its parent chain to allow for
       * integrated nested scrolling along the same axis.
       */
      static final int PFLAG3_NESTED_SCROLLING_ENABLED = 0x80;
  
      /**
       * Flag indicating that the bottom scroll indicator should be displayed
       * when this view can scroll up.
       */
      static final int PFLAG3_SCROLL_INDICATOR_TOP = 0x0100;
  
      /**
       * Flag indicating that the bottom scroll indicator should be displayed
       * when this view can scroll down.
       */
      static final int PFLAG3_SCROLL_INDICATOR_BOTTOM = 0x0200;
  
      /**
       * Flag indicating that the left scroll indicator should be displayed
       * when this view can scroll left.
       */
      static final int PFLAG3_SCROLL_INDICATOR_LEFT = 0x0400;
  
      /**
       * Flag indicating that the right scroll indicator should be displayed
       * when this view can scroll right.
       */
      static final int PFLAG3_SCROLL_INDICATOR_RIGHT = 0x0800;
  
      /**
       * Flag indicating that the start scroll indicator should be displayed
       * when this view can scroll in the start direction.
       */
      static final int PFLAG3_SCROLL_INDICATOR_START = 0x1000;
  
      /**
       * Flag indicating that the end scroll indicator should be displayed
       * when this view can scroll in the end direction.
       */
      static final int PFLAG3_SCROLL_INDICATOR_END = 0x2000;
  
      static final int DRAG_MASK = PFLAG2_DRAG_CAN_ACCEPT | PFLAG2_DRAG_HOVERED;
  
      static final int SCROLL_INDICATORS_NONE = 0x0000;
  
      /**
       * Mask for use with setFlags indicating bits used for indicating which
       * scroll indicators are enabled.
       */
      static final int SCROLL_INDICATORS_PFLAG3_MASK = PFLAG3_SCROLL_INDICATOR_TOP
              | PFLAG3_SCROLL_INDICATOR_BOTTOM | PFLAG3_SCROLL_INDICATOR_LEFT
              | PFLAG3_SCROLL_INDICATOR_RIGHT | PFLAG3_SCROLL_INDICATOR_START
              | PFLAG3_SCROLL_INDICATOR_END;
  
      /**
       * Left-shift required to translate between public scroll indicator flags
       * and internal PFLAGS3 flags. When used as a right-shift, translates
       * PFLAGS3 flags to public flags.
       */
      static final int SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT = 8;
  
      /** @hide */
      @Retention(RetentionPolicy.SOURCE)
      @IntDef(flag = true, prefix = { "SCROLL_INDICATOR_" }, value = {
              SCROLL_INDICATOR_TOP,
              SCROLL_INDICATOR_BOTTOM,
              SCROLL_INDICATOR_LEFT,
              SCROLL_INDICATOR_RIGHT,
              SCROLL_INDICATOR_START,
              SCROLL_INDICATOR_END,
      })
      public @interface ScrollIndicators {}
  
      /**
       * Scroll indicator direction for the top edge of the view.
       *
       * @see #setScrollIndicators(int)
       * @see #setScrollIndicators(int, int)
       * @see #getScrollIndicators()
       */
      public static final int SCROLL_INDICATOR_TOP =
              PFLAG3_SCROLL_INDICATOR_TOP >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
  
      /**
       * Scroll indicator direction for the bottom edge of the view.
       *
       * @see #setScrollIndicators(int)
       * @see #setScrollIndicators(int, int)
       * @see #getScrollIndicators()
       */
      public static final int SCROLL_INDICATOR_BOTTOM =
              PFLAG3_SCROLL_INDICATOR_BOTTOM >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
  
      /**
       * Scroll indicator direction for the left edge of the view.
       *
       * @see #setScrollIndicators(int)
       * @see #setScrollIndicators(int, int)
       * @see #getScrollIndicators()
       */
      public static final int SCROLL_INDICATOR_LEFT =
              PFLAG3_SCROLL_INDICATOR_LEFT >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
  
      /**
       * Scroll indicator direction for the right edge of the view.
       *
       * @see #setScrollIndicators(int)
       * @see #setScrollIndicators(int, int)
       * @see #getScrollIndicators()
       */
      public static final int SCROLL_INDICATOR_RIGHT =
              PFLAG3_SCROLL_INDICATOR_RIGHT >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
  
      /**
       * Scroll indicator direction for the starting edge of the view.
       * <p>
       * Resolved according to the view's layout direction, see
       * {@link #getLayoutDirection()} for more information.
       *
       * @see #setScrollIndicators(int)
       * @see #setScrollIndicators(int, int)
       * @see #getScrollIndicators()
       */
      public static final int SCROLL_INDICATOR_START =
              PFLAG3_SCROLL_INDICATOR_START >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
  
      /**
       * Scroll indicator direction for the ending edge of the view.
       * <p>
       * Resolved according to the view's layout direction, see
       * {@link #getLayoutDirection()} for more information.
       *
       * @see #setScrollIndicators(int)
       * @see #setScrollIndicators(int, int)
       * @see #getScrollIndicators()
       */
      public static final int SCROLL_INDICATOR_END =
              PFLAG3_SCROLL_INDICATOR_END >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
  
      /**
       * <p>Indicates that we are allowing {@link ViewStructure} to traverse
       * into this view.<p>
       */
      static final int PFLAG3_ASSIST_BLOCKED = 0x4000;
  
      /**
       * Flag indicating that the view is a root of a keyboard navigation cluster.
       *
       * @see #isKeyboardNavigationCluster()
       * @see #setKeyboardNavigationCluster(boolean)
       */
      private static final int PFLAG3_CLUSTER = 0x8000;
  
      /**
       * Flag indicating that the view is autofilled
       *
       * @see #isAutofilled()
       * @see #setAutofilled(boolean)
       */
      private static final int PFLAG3_IS_AUTOFILLED = 0x10000;
  
      /**
       * Indicates that the user is currently touching the screen.
       * Currently used for the tooltip positioning only.
       */
      private static final int PFLAG3_FINGER_DOWN = 0x20000;
  
      /**
       * Flag indicating that this view is the default-focus view.
       *
       * @see #isFocusedByDefault()
       * @see #setFocusedByDefault(boolean)
       */
      private static final int PFLAG3_FOCUSED_BY_DEFAULT = 0x40000;
  
      /**
       * Shift for the bits in {@link #mPrivateFlags3} related to the
       * "importantForAutofill" attribute.
       */
      static final int PFLAG3_IMPORTANT_FOR_AUTOFILL_SHIFT = 19;
  
      /**
       * Mask for obtaining the bits which specify how to determine
       * whether a view is important for autofill.
       */
      static final int PFLAG3_IMPORTANT_FOR_AUTOFILL_MASK = (IMPORTANT_FOR_AUTOFILL_AUTO
              | IMPORTANT_FOR_AUTOFILL_YES | IMPORTANT_FOR_AUTOFILL_NO
              | IMPORTANT_FOR_AUTOFILL_YES_EXCLUDE_DESCENDANTS
              | IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS)
              << PFLAG3_IMPORTANT_FOR_AUTOFILL_SHIFT;
  
      /**
       * Whether this view has rendered elements that overlap (see {@link
       * #hasOverlappingRendering()}, {@link #forceHasOverlappingRendering(boolean)}, and
       * {@link #getHasOverlappingRendering()} ). The value in this bit is only valid when
       * PFLAG3_HAS_OVERLAPPING_RENDERING_FORCED has been set. Otherwise, the value is
       * determined by whatever {@link #hasOverlappingRendering()} returns.
       */
      private static final int PFLAG3_OVERLAPPING_RENDERING_FORCED_VALUE = 0x800000;
  
      /**
       * Whether {@link #forceHasOverlappingRendering(boolean)} has been called. When true, value
       * in PFLAG3_OVERLAPPING_RENDERING_FORCED_VALUE is valid.
       */
      private static final int PFLAG3_HAS_OVERLAPPING_RENDERING_FORCED = 0x1000000;
  
      /**
       * Flag indicating that the view is temporarily detached from the parent view.
       *
       * @see #onStartTemporaryDetach()
       * @see #onFinishTemporaryDetach()
       */
      static final int PFLAG3_TEMPORARY_DETACH = 0x2000000;
  
      /**
       * Flag indicating that the view does not wish to be revealed within its parent
       * hierarchy when it gains focus. Expressed in the negative since the historical
       * default behavior is to reveal on focus; this flag suppresses that behavior.
       *
       * @see #setRevealOnFocusHint(boolean)
       * @see #getRevealOnFocusHint()
       */
      private static final int PFLAG3_NO_REVEAL_ON_FOCUS = 0x4000000;
  
      /**
       * Flag indicating that when layout is completed we should notify
       * that the view was entered for autofill purposes. To minimize
       * showing autofill for views not visible to the user we evaluate
       * user visibility which cannot be done until the view is laid out.
       */
      static final int PFLAG3_NOTIFY_AUTOFILL_ENTER_ON_LAYOUT = 0x8000000;
  
      /**
       * Works like focusable for screen readers, but without the side effects on input focus.
       * @see #setScreenReaderFocusable(boolean)
       */
      private static final int PFLAG3_SCREEN_READER_FOCUSABLE = 0x10000000;
  
      /**
       * The last aggregated visibility. Used to detect when it truly changes.
       */
      private static final int PFLAG3_AGGREGATED_VISIBLE = 0x20000000;
  
      /**
       * Used to indicate that {@link #mAutofillId} was explicitly set through
       * {@link #setAutofillId(AutofillId)}.
       */
      private static final int PFLAG3_AUTOFILLID_EXPLICITLY_SET = 0x40000000;
  
      /**
       * Indicates if the View is a heading for accessibility purposes
       */
      private static final int PFLAG3_ACCESSIBILITY_HEADING = 0x80000000;
  
      /* End of masks for mPrivateFlags3 */
  
      /*
       * Masks for mPrivateFlags4, as generated by dumpFlags():
       *
       * |-------|-------|-------|-------|
       *                             1111 PFLAG4_IMPORTANT_FOR_CONTENT_CAPTURE_MASK
       *                            1     PFLAG4_NOTIFIED_CONTENT_CAPTURE_APPEARED
       *                           1      PFLAG4_NOTIFIED_CONTENT_CAPTURE_DISAPPEARED
       *                          1       PFLAG4_CONTENT_CAPTURE_IMPORTANCE_IS_CACHED
       *                         1        PFLAG4_CONTENT_CAPTURE_IMPORTANCE_CACHED_VALUE
       *                         11       PFLAG4_CONTENT_CAPTURE_IMPORTANCE_MASK
       * |-------|-------|-------|-------|
       */
  
      /**
       * Mask for obtaining the bits which specify how to determine
       * whether a view is important for autofill.
       *
       * <p>NOTE: the important for content capture values were the first flags added and are set in
       * the rightmost position, so we don't need to shift them
       */
      private static final int PFLAG4_IMPORTANT_FOR_CONTENT_CAPTURE_MASK =
              IMPORTANT_FOR_CONTENT_CAPTURE_AUTO | IMPORTANT_FOR_CONTENT_CAPTURE_YES
              | IMPORTANT_FOR_CONTENT_CAPTURE_NO
              | IMPORTANT_FOR_CONTENT_CAPTURE_YES_EXCLUDE_DESCENDANTS
              | IMPORTANT_FOR_CONTENT_CAPTURE_NO_EXCLUDE_DESCENDANTS;
  
      /*
       * Variables used to control when the IntelligenceManager.notifyNodeAdded()/removed() methods
       * should be called.
       *
       * The idea is to call notifyAppeared() after the view is layout and visible, then call
       * notifyDisappeared() when it's gone (without known when it was removed from the parent).
       */
      private static final int PFLAG4_NOTIFIED_CONTENT_CAPTURE_APPEARED = 0x10;
      private static final int PFLAG4_NOTIFIED_CONTENT_CAPTURE_DISAPPEARED = 0x20;
  
      /*
       * Flags used to cache the value returned by isImportantForContentCapture while the view
       * hierarchy is being traversed.
       */
      private static final int PFLAG4_CONTENT_CAPTURE_IMPORTANCE_IS_CACHED = 0x40;
      private static final int PFLAG4_CONTENT_CAPTURE_IMPORTANCE_CACHED_VALUE = 0x80;
  
      private static final int PFLAG4_CONTENT_CAPTURE_IMPORTANCE_MASK =
              PFLAG4_CONTENT_CAPTURE_IMPORTANCE_IS_CACHED
              | PFLAG4_CONTENT_CAPTURE_IMPORTANCE_CACHED_VALUE;
  
      /* End of masks for mPrivateFlags4 */
  
      /** @hide */
      protected static final int VIEW_STRUCTURE_FOR_ASSIST = 0;
      /** @hide */
      protected  static final int VIEW_STRUCTURE_FOR_AUTOFILL = 1;
      /** @hide */
      protected  static final int VIEW_STRUCTURE_FOR_CONTENT_CAPTURE = 2;
  
      /** @hide */
      @IntDef(flag = true, prefix = { "VIEW_STRUCTURE_FOR" }, value = {
              VIEW_STRUCTURE_FOR_ASSIST,
              VIEW_STRUCTURE_FOR_AUTOFILL,
              VIEW_STRUCTURE_FOR_CONTENT_CAPTURE
      })
      @Retention(RetentionPolicy.SOURCE)
      public @interface ViewStructureType {}
  
      /**
       * Always allow a user to over-scroll this view, provided it is a
       * view that can scroll.
       *
       * @see #getOverScrollMode()
       * @see #setOverScrollMode(int)
       */
      public static final int OVER_SCROLL_ALWAYS = 0;
  
      /**
       * Allow a user to over-scroll this view only if the content is large
       * enough to meaningfully scroll, provided it is a view that can scroll.
       *
       * @see #getOverScrollMode()
       * @see #setOverScrollMode(int)
       */
      public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1;
  
      /**
       * Never allow a user to over-scroll this view.
       *
       * @see #getOverScrollMode()
       * @see #setOverScrollMode(int)
       */
      public static final int OVER_SCROLL_NEVER = 2;
  
      /**
       * Special constant for {@link #setSystemUiVisibility(int)}: View has
       * requested the system UI (status bar) to be visible (the default).
       *
       * @see #setSystemUiVisibility(int)
       */
      public static final int SYSTEM_UI_FLAG_VISIBLE = 0;
  
      /**
       * Flag for {@link #setSystemUiVisibility(int)}: View has requested the
       * system UI to enter an unobtrusive "low profile" mode.
       *
       * <p>This is for use in games, book readers, video players, or any other
       * "immersive" application where the usual system chrome is deemed too distracting.
       *
       * <p>In low profile mode, the status bar and/or navigation icons may dim.
       *
       * @see #setSystemUiVisibility(int)
       */
      public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001;
  
      /**
       * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the
       * system navigation be temporarily hidden.
       *
       * <p>This is an even less obtrusive state than that called for by
       * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls
       * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause
       * those to disappear. This is useful (in conjunction with the
       * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and
       * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN}
       * window flags) for displaying content using every last pixel on the display.
       *
       * <p>There is a limitation: because navigation controls are so important, the least user
       * interaction will cause them to reappear immediately.  When this happens, both
       * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically,
       * so that both elements reappear at the same time.
       *
       * @see #setSystemUiVisibility(int)
       */
      public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002;
  
      /**
       * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go
       * into the normal fullscreen mode so that its content can take over the screen
       * while still allowing the user to interact with the application.
       *
       * <p>This has the same visual effect as
       * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN
       * WindowManager.LayoutParams.FLAG_FULLSCREEN},
       * meaning that non-critical screen decorations (such as the status bar) will be
       * hidden while the user is in the View's window, focusing the experience on
       * that content.  Unlike the window flag, if you are using ActionBar in
       * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY
       * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also
       * hide the action bar.
       *
       * <p>This approach to going fullscreen is best used over the window flag when
       * it is a transient state -- that is, the application does this at certain
       * points in its user interaction where it wants to allow the user to focus
       * on content, but not as a continuous state.  For situations where the application
       * would like to simply stay full screen the entire time (such as a game that
       * wants to take over the screen), the
       * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag}
       * is usually a better approach.  The state set here will be removed by the system
       * in various situations (such as the user moving to another application) like
       * the other system UI states.
       *
       * <p>When using this flag, the application should provide some easy facility
       * for the user to go out of it.  A common example would be in an e-book
       * reader, where tapping on the screen brings back whatever screen and UI
       * decorations that had been hidden while the user was immersed in reading
       * the book.
       *
       * @see #setSystemUiVisibility(int)
       */
      public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004;
  
      /**
       * Flag for {@link #setSystemUiVisibility(int)}: When using other layout
       * flags, we would like a stable view of the content insets given to
       * {@link #fitSystemWindows(Rect)}.  This means that the insets seen there
       * will always represent the worst case that the application can expect
       * as a continuous state.  In the stock Android UI this is the space for
       * the system bar, nav bar, and status bar, but not more transient elements
       * such as an input method.
       *
       * The stable layout your UI sees is based on the system UI modes you can
       * switch to.  That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}
       * then you will get a stable layout for changes of the
       * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify
       * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and
       * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition
       * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}
       * with a stable layout.  (Note that you should avoid using
       * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.)
       *
       * If you have set the window flag {@link WindowManager.LayoutParams#FLAG_FULLSCREEN}
       * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}),
       * then a hidden status bar will be considered a "stable" state for purposes
       * here.  This allows your UI to continually hide the status bar, while still
       * using the system UI flags to hide the action bar while still retaining
       * a stable layout.  Note that changing the window fullscreen flag will never
       * provide a stable layout for a clean transition.
       *
       * <p>If you are using ActionBar in
       * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY
       * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the
       * insets it adds to those given to the application.
       */
      public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100;
  
      /**
       * Flag for {@link #setSystemUiVisibility(int)}: View would like its window
       * to be laid out as if it has requested
       * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't.  This
       * allows it to avoid artifacts when switching in and out of that mode, at
       * the expense that some of its user interface may be covered by screen
       * decorations when they are shown.  You can perform layout of your inner
       * UI elements to account for the navigation system UI through the
       * {@link #fitSystemWindows(Rect)} method.
       */
      public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200;
  
      /**
       * Flag for {@link #setSystemUiVisibility(int)}: View would like its window
       * to be laid out as if it has requested
       * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't.  This
       * allows it to avoid artifacts when switching in and out of that mode, at
       * the expense that some of its user interface may be covered by screen
       * decorations when they are shown.  You can perform layout of your inner
       * UI elements to account for non-fullscreen system UI through the
       * {@link #fitSystemWindows(Rect)} method.
       *
       * <p>Note: on displays that have a {@link DisplayCutout}, the window may still be placed
       *  differently than if {@link #SYSTEM_UI_FLAG_FULLSCREEN} was set, if the
       *  window's {@link WindowManager.LayoutParams#layoutInDisplayCutoutMode
       *  layoutInDisplayCutoutMode} is
       *  {@link WindowManager.LayoutParams#LAYOUT_IN_DISPLAY_CUTOUT_MODE_DEFAULT
       *  LAYOUT_IN_DISPLAY_CUTOUT_MODE_DEFAULT}. To avoid this, use either of the other modes.
       *
       * @see WindowManager.LayoutParams#layoutInDisplayCutoutMode
       * @see WindowManager.LayoutParams#LAYOUT_IN_DISPLAY_CUTOUT_MODE_DEFAULT
       * @see WindowManager.LayoutParams#LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES
       * @see WindowManager.LayoutParams#LAYOUT_IN_DISPLAY_CUTOUT_MODE_NEVER
       */
      public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400;
  
      /**
       * Flag for {@link #setSystemUiVisibility(int)}: View would like to remain interactive when
       * hiding the navigation bar with {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}.  If this flag is
       * not set, {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} will be force cleared by the system on any
       * user interaction.
       * <p>Since this flag is a modifier for {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, it only
       * has an effect when used in combination with that flag.</p>
       */
      public static final int SYSTEM_UI_FLAG_IMMERSIVE = 0x00000800;
  
      /**
       * Flag for {@link #setSystemUiVisibility(int)}: View would like to remain interactive when
       * hiding the status bar with {@link #SYSTEM_UI_FLAG_FULLSCREEN} and/or hiding the navigation
       * bar with {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}.  Use this flag to create an immersive
       * experience while also hiding the system bars.  If this flag is not set,
       * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} will be force cleared by the system on any user
       * interaction, and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be force-cleared by the system
       * if the user swipes from the top of the screen.
       * <p>When system bars are hidden in immersive mode, they can be revealed temporarily with
       * system gestures, such as swiping from the top of the screen.  These transient system bars
       * will overlay app's content, may have some degree of transparency, and will automatically
       * hide after a short timeout.
       * </p><p>Since this flag is a modifier for {@link #SYSTEM_UI_FLAG_FULLSCREEN} and
       * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, it only has an effect when used in combination
       * with one or both of those flags.</p>
       */
      public static final int SYSTEM_UI_FLAG_IMMERSIVE_STICKY = 0x00001000;
  
      /**
       * Flag for {@link #setSystemUiVisibility(int)}: Requests the status bar to draw in a mode that
       * is compatible with light status bar backgrounds.
       *
       * <p>For this to take effect, the window must request
       * {@link android.view.WindowManager.LayoutParams#FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS
       *         FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS} but not
       * {@link android.view.WindowManager.LayoutParams#FLAG_TRANSLUCENT_STATUS
       *         FLAG_TRANSLUCENT_STATUS}.
       *
       * @see android.R.attr#windowLightStatusBar
       */
      public static final int SYSTEM_UI_FLAG_LIGHT_STATUS_BAR = 0x00002000;
  
      /**
       * This flag was previously used for a private API. DO NOT reuse it for a public API as it might
       * trigger undefined behavior on older platforms with apps compiled against a new SDK.
       */
      private static final int SYSTEM_UI_RESERVED_LEGACY1 = 0x00004000;
  
      /**
       * This flag was previously used for a private API. DO NOT reuse it for a public API as it might
       * trigger undefined behavior on older platforms with apps compiled against a new SDK.
       */
      private static final int SYSTEM_UI_RESERVED_LEGACY2 = 0x00010000;
  
      /**
       * Flag for {@link #setSystemUiVisibility(int)}: Requests the navigation bar to draw in a mode
       * that is compatible with light navigation bar backgrounds.
       *
       * <p>For this to take effect, the window must request
       * {@link android.view.WindowManager.LayoutParams#FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS
       *         FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS} but not
       * {@link android.view.WindowManager.LayoutParams#FLAG_TRANSLUCENT_NAVIGATION
       *         FLAG_TRANSLUCENT_NAVIGATION}.
       *
       * @see android.R.attr#windowLightNavigationBar
       */
      public static final int SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR = 0x00000010;
  
      /**
       * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead.
       */
      @Deprecated
      public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE;
  
      /**
       * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead.
       */
      @Deprecated
      public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE;
  
      /**
       * @hide
       *
       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
       * out of the public fields to keep the undefined bits out of the developer's way.
       *
       * Flag to make the status bar not expandable.  Unless you also
       * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show.
       */
      @UnsupportedAppUsage
      public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000;
  
      /**
       * @hide
       *
       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
       * out of the public fields to keep the undefined bits out of the developer's way.
       *
       * Flag to hide notification icons and scrolling ticker text.
       */
      public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000;
  
      /**
       * @hide
       *
       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
       * out of the public fields to keep the undefined bits out of the developer's way.
       *
       * Flag to disable incoming notification alerts.  This will not block
       * icons, but it will block sound, vibrating and other visual or aural notifications.
       */
      public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000;
  
      /**
       * @hide
       *
       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
       * out of the public fields to keep the undefined bits out of the developer's way.
       *
       * Flag to hide only the scrolling ticker.  Note that
       * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies
       * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}.
       */
      public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000;
  
      /**
       * @hide
       *
       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
       * out of the public fields to keep the undefined bits out of the developer's way.
       *
       * Flag to hide the center system info area.
       */
      public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000;
  
      /**
       * @hide
       *
       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
       * out of the public fields to keep the undefined bits out of the developer's way.
       *
       * Flag to hide only the home button.  Don't use this
       * unless you're a special part of the system UI (i.e., setup wizard, keyguard).
       */
      @UnsupportedAppUsage
      public static final int STATUS_BAR_DISABLE_HOME = 0x00200000;
  
      /**
       * @hide
       *
       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
       * out of the public fields to keep the undefined bits out of the developer's way.
       *
       * Flag to hide only the back button. Don't use this
       * unless you're a special part of the system UI (i.e., setup wizard, keyguard).
       */
      @UnsupportedAppUsage
      public static final int STATUS_BAR_DISABLE_BACK = 0x00400000;
  
      /**
       * @hide
       *
       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
       * out of the public fields to keep the undefined bits out of the developer's way.
       *
       * Flag to hide only the clock.  You might use this if your activity has
       * its own clock making the status bar's clock redundant.
       */
      public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000;
  
      /**
       * @hide
       *
       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
       * out of the public fields to keep the undefined bits out of the developer's way.
       *
       * Flag to hide only the recent apps button. Don't use this
       * unless you're a special part of the system UI (i.e., setup wizard, keyguard).
       */
      @UnsupportedAppUsage
      public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000;
  
      /**
       * @hide
       *
       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
       * out of the public fields to keep the undefined bits out of the developer's way.
       *
       * Flag to disable the global search gesture. Don't use this
       * unless you're a special part of the system UI (i.e., setup wizard, keyguard).
       */
      public static final int STATUS_BAR_DISABLE_SEARCH = 0x02000000;
  
      /**
       * @hide
       *
       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
       * out of the public fields to keep the undefined bits out of the developer's way.
       *
       * Flag to specify that the status bar is displayed in transient mode.
       */
      public static final int STATUS_BAR_TRANSIENT = 0x04000000;
  
      /**
       * @hide
       *
       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
       * out of the public fields to keep the undefined bits out of the developer's way.
       *
       * Flag to specify that the navigation bar is displayed in transient mode.
       */
      @UnsupportedAppUsage
      public static final int NAVIGATION_BAR_TRANSIENT = 0x08000000;
  
      /**
       * @hide
       *
       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
       * out of the public fields to keep the undefined bits out of the developer's way.
       *
       * Flag to specify that the hidden status bar would like to be shown.
       */
      public static final int STATUS_BAR_UNHIDE = 0x10000000;
  
      /**
       * @hide
       *
       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
       * out of the public fields to keep the undefined bits out of the developer's way.
       *
       * Flag to specify that the hidden navigation bar would like to be shown.
       */
      public static final int NAVIGATION_BAR_UNHIDE = 0x20000000;
  
      /**
       * @hide
       *
       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
       * out of the public fields to keep the undefined bits out of the developer's way.
       *
       * Flag to specify that the status bar is displayed in translucent mode.
       */
      public static final int STATUS_BAR_TRANSLUCENT = 0x40000000;
  
      /**
       * @hide
       *
       * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
       * out of the public fields to keep the undefined bits out of the developer's way.
       *
       * Flag to specify that the navigation bar is displayed in translucent mode.
       */
      public static final int NAVIGATION_BAR_TRANSLUCENT = 0x80000000;
  
      /**
       * @hide
       *
       * Makes navigation bar transparent (but not the status bar).
       */
      public static final int NAVIGATION_BAR_TRANSPARENT = 0x00008000;
  
      /**
       * @hide
       *
       * Makes status bar transparent (but not the navigation bar).
       */
      public static final int STATUS_BAR_TRANSPARENT = 0x00000008;
  
      /**
       * @hide
       *
       * Makes both status bar and navigation bar transparent.
       */
      public static final int SYSTEM_UI_TRANSPARENT = NAVIGATION_BAR_TRANSPARENT
              | STATUS_BAR_TRANSPARENT;
  
      /**
       * @hide
       */
      public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x00003FF7;
  
      /**
       * These are the system UI flags that can be cleared by events outside
       * of an application.  Currently this is just the ability to tap on the
       * screen while hiding the navigation bar to have it return.
       * @hide
       */
      public static final int SYSTEM_UI_CLEARABLE_FLAGS =
              SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION
              | SYSTEM_UI_FLAG_FULLSCREEN;
  
      /**
       * Flags that can impact the layout in relation to system UI.
       */
      public static final int SYSTEM_UI_LAYOUT_FLAGS =
              SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
              | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
  
      /** @hide */
      @IntDef(flag = true, prefix = { "FIND_VIEWS_" }, value = {
              FIND_VIEWS_WITH_TEXT,
              FIND_VIEWS_WITH_CONTENT_DESCRIPTION
      })
      @Retention(RetentionPolicy.SOURCE)
      public @interface FindViewFlags {}
  
      /**
       * Find views that render the specified text.
       *
       * @see #findViewsWithText(ArrayList, CharSequence, int)
       */
      public static final int FIND_VIEWS_WITH_TEXT = 0x00000001;
  
      /**
       * Find find views that contain the specified content description.
       *
       * @see #findViewsWithText(ArrayList, CharSequence, int)
       */
      public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002;
  
      /**
       * Find views that contain {@link AccessibilityNodeProvider}. Such
       * a View is a root of virtual view hierarchy and may contain the searched
       * text. If this flag is set Views with providers are automatically
       * added and it is a responsibility of the client to call the APIs of
       * the provider to determine whether the virtual tree rooted at this View
       * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s
       * representing the virtual views with this text.
       *
       * @see #findViewsWithText(ArrayList, CharSequence, int)
       *
       * @hide
       */
      public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004;
  
      /**
       * The undefined cursor position.
       *
       * @hide
       */
      public static final int ACCESSIBILITY_CURSOR_POSITION_UNDEFINED = -1;
  
      /**
       * Indicates that the screen has changed state and is now off.
       *
       * @see #onScreenStateChanged(int)
       */
      public static final int SCREEN_STATE_OFF = 0x0;
  
      /**
       * Indicates that the screen has changed state and is now on.
       *
       * @see #onScreenStateChanged(int)
       */
      public static final int SCREEN_STATE_ON = 0x1;
  
      /**
       * Indicates no axis of view scrolling.
       */
      public static final int SCROLL_AXIS_NONE = 0;
  
      /**
       * Indicates scrolling along the horizontal axis.
       */
      public static final int SCROLL_AXIS_HORIZONTAL = 1 << 0;
  
      /**
       * Indicates scrolling along the vertical axis.
       */
      public static final int SCROLL_AXIS_VERTICAL = 1 << 1;
  
      /**
       * Controls the over-scroll mode for this view.
       * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)},
       * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS},
       * and {@link #OVER_SCROLL_NEVER}.
       */
      private int mOverScrollMode;
  
      /**
       * The parent this view is attached to.
       * {@hide}
       *
       * @see #getParent()
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
      protected ViewParent mParent;
  
      /**
       * {@hide}
       *
       * Not available for general use. If you need help, hang up and then dial one of the following
       * public APIs:
       *
       * @see #isAttachedToWindow() for current attach state
       * @see #onAttachedToWindow() for subclasses performing work when becoming attached
       * @see #onDetachedFromWindow() for subclasses performing work when becoming detached
       * @see OnAttachStateChangeListener for other code performing work on attach/detach
       * @see #getHandler() for posting messages to this view's UI thread/looper
       * @see #getParent() for interacting with the parent chain
       * @see #getWindowToken() for the current window token
       * @see #getRootView() for the view at the root of the attached hierarchy
       * @see #getDisplay() for the Display this view is presented on
       * @see #getRootWindowInsets() for the current insets applied to the whole attached window
       * @see #hasWindowFocus() for whether the attached window is currently focused
       * @see #getWindowVisibility() for checking the visibility of the attached window
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
      AttachInfo mAttachInfo;
  
      /**
       * {@hide}
       */
      @ViewDebug.ExportedProperty(flagMapping = {
          @ViewDebug.FlagToString(mask = PFLAG_FORCE_LAYOUT, equals = PFLAG_FORCE_LAYOUT,
                  name = "FORCE_LAYOUT"),
          @ViewDebug.FlagToString(mask = PFLAG_LAYOUT_REQUIRED, equals = PFLAG_LAYOUT_REQUIRED,
                  name = "LAYOUT_REQUIRED"),
          @ViewDebug.FlagToString(mask = PFLAG_DRAWING_CACHE_VALID, equals = PFLAG_DRAWING_CACHE_VALID,
              name = "DRAWING_CACHE_INVALID", outputIf = false),
          @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "DRAWN", outputIf = true),
          @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "NOT_DRAWN", outputIf = false),
          @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY, name = "DIRTY")
      }, formatToHexString = true)
  
      /* @hide */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 123769414)
      public int mPrivateFlags;
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 123768943)
      int mPrivateFlags2;
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 129147060)
      int mPrivateFlags3;
  
      private int mPrivateFlags4;
  
      /**
       * This view's request for the visibility of the status bar.
       * @hide
       */
      @ViewDebug.ExportedProperty(flagMapping = {
              @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE,
                      equals = SYSTEM_UI_FLAG_LOW_PROFILE,
                      name = "LOW_PROFILE"),
              @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION,
                      equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION,
                      name = "HIDE_NAVIGATION"),
              @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_FULLSCREEN,
                      equals = SYSTEM_UI_FLAG_FULLSCREEN,
                      name = "FULLSCREEN"),
              @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LAYOUT_STABLE,
                      equals = SYSTEM_UI_FLAG_LAYOUT_STABLE,
                      name = "LAYOUT_STABLE"),
              @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION,
                      equals = SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION,
                      name = "LAYOUT_HIDE_NAVIGATION"),
              @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN,
                      equals = SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN,
                      name = "LAYOUT_FULLSCREEN"),
              @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_IMMERSIVE,
                      equals = SYSTEM_UI_FLAG_IMMERSIVE,
                      name = "IMMERSIVE"),
              @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_IMMERSIVE_STICKY,
                      equals = SYSTEM_UI_FLAG_IMMERSIVE_STICKY,
                      name = "IMMERSIVE_STICKY"),
              @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LIGHT_STATUS_BAR,
                      equals = SYSTEM_UI_FLAG_LIGHT_STATUS_BAR,
                      name = "LIGHT_STATUS_BAR"),
              @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR,
                      equals = SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR,
                      name = "LIGHT_NAVIGATION_BAR"),
              @ViewDebug.FlagToString(mask = STATUS_BAR_DISABLE_EXPAND,
                      equals = STATUS_BAR_DISABLE_EXPAND,
                      name = "STATUS_BAR_DISABLE_EXPAND"),
              @ViewDebug.FlagToString(mask = STATUS_BAR_DISABLE_NOTIFICATION_ICONS,
                      equals = STATUS_BAR_DISABLE_NOTIFICATION_ICONS,
                      name = "STATUS_BAR_DISABLE_NOTIFICATION_ICONS"),
              @ViewDebug.FlagToString(mask = STATUS_BAR_DISABLE_NOTIFICATION_ALERTS,
                      equals = STATUS_BAR_DISABLE_NOTIFICATION_ALERTS,
                      name = "STATUS_BAR_DISABLE_NOTIFICATION_ALERTS"),
              @ViewDebug.FlagToString(mask = STATUS_BAR_DISABLE_NOTIFICATION_TICKER,
                      equals = STATUS_BAR_DISABLE_NOTIFICATION_TICKER,
                      name = "STATUS_BAR_DISABLE_NOTIFICATION_TICKER"),
              @ViewDebug.FlagToString(mask = STATUS_BAR_DISABLE_SYSTEM_INFO,
                      equals = STATUS_BAR_DISABLE_SYSTEM_INFO,
                      name = "STATUS_BAR_DISABLE_SYSTEM_INFO"),
              @ViewDebug.FlagToString(mask = STATUS_BAR_DISABLE_HOME,
                      equals = STATUS_BAR_DISABLE_HOME,
                      name = "STATUS_BAR_DISABLE_HOME"),
              @ViewDebug.FlagToString(mask = STATUS_BAR_DISABLE_BACK,
                      equals = STATUS_BAR_DISABLE_BACK,
                      name = "STATUS_BAR_DISABLE_BACK"),
              @ViewDebug.FlagToString(mask = STATUS_BAR_DISABLE_CLOCK,
                      equals = STATUS_BAR_DISABLE_CLOCK,
                      name = "STATUS_BAR_DISABLE_CLOCK"),
              @ViewDebug.FlagToString(mask = STATUS_BAR_DISABLE_RECENT,
                      equals = STATUS_BAR_DISABLE_RECENT,
                      name = "STATUS_BAR_DISABLE_RECENT"),
              @ViewDebug.FlagToString(mask = STATUS_BAR_DISABLE_SEARCH,
                      equals = STATUS_BAR_DISABLE_SEARCH,
                      name = "STATUS_BAR_DISABLE_SEARCH"),
              @ViewDebug.FlagToString(mask = STATUS_BAR_TRANSIENT,
                      equals = STATUS_BAR_TRANSIENT,
                      name = "STATUS_BAR_TRANSIENT"),
              @ViewDebug.FlagToString(mask = NAVIGATION_BAR_TRANSIENT,
                      equals = NAVIGATION_BAR_TRANSIENT,
                      name = "NAVIGATION_BAR_TRANSIENT"),
              @ViewDebug.FlagToString(mask = STATUS_BAR_UNHIDE,
                      equals = STATUS_BAR_UNHIDE,
                      name = "STATUS_BAR_UNHIDE"),
              @ViewDebug.FlagToString(mask = NAVIGATION_BAR_UNHIDE,
                      equals = NAVIGATION_BAR_UNHIDE,
                      name = "NAVIGATION_BAR_UNHIDE"),
              @ViewDebug.FlagToString(mask = STATUS_BAR_TRANSLUCENT,
                      equals = STATUS_BAR_TRANSLUCENT,
                      name = "STATUS_BAR_TRANSLUCENT"),
              @ViewDebug.FlagToString(mask = NAVIGATION_BAR_TRANSLUCENT,
                      equals = NAVIGATION_BAR_TRANSLUCENT,
                      name = "NAVIGATION_BAR_TRANSLUCENT"),
              @ViewDebug.FlagToString(mask = NAVIGATION_BAR_TRANSPARENT,
                      equals = NAVIGATION_BAR_TRANSPARENT,
                      name = "NAVIGATION_BAR_TRANSPARENT"),
              @ViewDebug.FlagToString(mask = STATUS_BAR_TRANSPARENT,
                      equals = STATUS_BAR_TRANSPARENT,
                      name = "STATUS_BAR_TRANSPARENT")
      }, formatToHexString = true)
      int mSystemUiVisibility;
  
      /**
       * Reference count for transient state.
       * @see #setHasTransientState(boolean)
       */
      int mTransientStateCount = 0;
  
      /**
       * Count of how many windows this view has been attached to.
       */
      int mWindowAttachCount;
  
      /**
       * The layout parameters associated with this view and used by the parent
       * {@link android.view.ViewGroup} to determine how this view should be
       * laid out.
       *
       * The field should not be used directly. Instead {@link #getLayoutParams()} and {@link
       * #setLayoutParams(ViewGroup.LayoutParams)} should be used. The setter guarantees internal
       * state correctness of the class.
       * {@hide}
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
      protected ViewGroup.LayoutParams mLayoutParams;
  
      /**
       * The view flags hold various views states.
       *
       * Use {@link #setTransitionVisibility(int)} to change the visibility of this view without
       * triggering updates.
       * {@hide}
       */
      @ViewDebug.ExportedProperty(formatToHexString = true)
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
      int mViewFlags;
  
      static class TransformationInfo {
          /**
           * The transform matrix for the View. This transform is calculated internally
           * based on the translation, rotation, and scale properties.
           *
           * Do *not* use this variable directly; instead call getMatrix(), which will
           * load the value from the View's RenderNode.
           */
          private final Matrix mMatrix = new Matrix();
  
          /**
           * The inverse transform matrix for the View. This transform is calculated
           * internally based on the translation, rotation, and scale properties.
           *
           * Do *not* use this variable directly; instead call getInverseMatrix(),
           * which will load the value from the View's RenderNode.
           */
          private Matrix mInverseMatrix;
  
          /**
           * The opacity of the View. This is a value from 0 to 1, where 0 means
           * completely transparent and 1 means completely opaque.
           */
          @ViewDebug.ExportedProperty
          private float mAlpha = 1f;
  
          /**
           * The opacity of the view as manipulated by the Fade transition. This is a
           * property only used by transitions, which is composited with the other alpha
           * values to calculate the final visual alpha value.
           */
          float mTransitionAlpha = 1f;
      }
  
      /** @hide */
      @UnsupportedAppUsage
      public TransformationInfo mTransformationInfo;
  
      /**
       * Current clip bounds. to which all drawing of this view are constrained.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      Rect mClipBounds = null;
  
      private boolean mLastIsOpaque;
  
      /**
       * The distance in pixels from the left edge of this view's parent
       * to the left edge of this view.
       * {@hide}
       */
      @ViewDebug.ExportedProperty(category = "layout")
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
      protected int mLeft;
      /**
       * The distance in pixels from the left edge of this view's parent
       * to the right edge of this view.
       * {@hide}
       */
      @ViewDebug.ExportedProperty(category = "layout")
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
      protected int mRight;
      /**
       * The distance in pixels from the top edge of this view's parent
       * to the top edge of this view.
       * {@hide}
       */
      @ViewDebug.ExportedProperty(category = "layout")
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
      protected int mTop;
      /**
       * The distance in pixels from the top edge of this view's parent
       * to the bottom edge of this view.
       * {@hide}
       */
      @ViewDebug.ExportedProperty(category = "layout")
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
      protected int mBottom;
  
      /**
       * The offset, in pixels, by which the content of this view is scrolled
       * horizontally.
       * Please use {@link View#getScrollX()} and {@link View#setScrollX(int)} instead of
       * accessing these directly.
       * {@hide}
       */
      @ViewDebug.ExportedProperty(category = "scrolling")
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
      protected int mScrollX;
      /**
       * The offset, in pixels, by which the content of this view is scrolled
       * vertically.
       * Please use {@link View#getScrollY()} and {@link View#setScrollY(int)} instead of
       * accessing these directly.
       * {@hide}
       */
      @ViewDebug.ExportedProperty(category = "scrolling")
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
      protected int mScrollY;
  
      /**
       * The final computed left padding in pixels that is used for drawing. This is the distance in
       * pixels between the left edge of this view and the left edge of its content.
       * {@hide}
       */
      @ViewDebug.ExportedProperty(category = "padding")
      @UnsupportedAppUsage
      protected int mPaddingLeft = 0;
      /**
       * The final computed right padding in pixels that is used for drawing. This is the distance in
       * pixels between the right edge of this view and the right edge of its content.
       * {@hide}
       */
      @ViewDebug.ExportedProperty(category = "padding")
      @UnsupportedAppUsage
      protected int mPaddingRight = 0;
      /**
       * The final computed top padding in pixels that is used for drawing. This is the distance in
       * pixels between the top edge of this view and the top edge of its content.
       * {@hide}
       */
      @ViewDebug.ExportedProperty(category = "padding")
      @UnsupportedAppUsage
      protected int mPaddingTop;
      /**
       * The final computed bottom padding in pixels that is used for drawing. This is the distance in
       * pixels between the bottom edge of this view and the bottom edge of its content.
       * {@hide}
       */
      @ViewDebug.ExportedProperty(category = "padding")
      @UnsupportedAppUsage
      protected int mPaddingBottom;
  
      /**
       * The layout insets in pixels, that is the distance in pixels between the
       * visible edges of this view its bounds.
       */
      private Insets mLayoutInsets;
  
      /**
       * Briefly describes the view and is primarily used for accessibility support.
       */
      private CharSequence mContentDescription;
  
      /**
       * If this view represents a distinct part of the window, it can have a title that labels the
       * area.
       */
      private CharSequence mAccessibilityPaneTitle;
  
      /**
       * Specifies the id of a view for which this view serves as a label for
       * accessibility purposes.
       */
      private int mLabelForId = View.NO_ID;
  
      /**
       * Predicate for matching labeled view id with its label for
       * accessibility purposes.
       */
      private MatchLabelForPredicate mMatchLabelForPredicate;
  
      /**
       * Specifies a view before which this one is visited in accessibility traversal.
       */
      private int mAccessibilityTraversalBeforeId = NO_ID;
  
      /**
       * Specifies a view after which this one is visited in accessibility traversal.
       */
      private int mAccessibilityTraversalAfterId = NO_ID;
  
      /**
       * Predicate for matching a view by its id.
       */
      private MatchIdPredicate mMatchIdPredicate;
  
      /**
       * The right padding after RTL resolution, but before taking account of scroll bars.
       *
       * @hide
       */
      @ViewDebug.ExportedProperty(category = "padding")
      protected int mUserPaddingRight;
  
      /**
       * The resolved bottom padding before taking account of scroll bars.
       *
       * @hide
       */
      @ViewDebug.ExportedProperty(category = "padding")
      protected int mUserPaddingBottom;
  
      /**
       * The left padding after RTL resolution, but before taking account of scroll bars.
       *
       * @hide
       */
      @ViewDebug.ExportedProperty(category = "padding")
      protected int mUserPaddingLeft;
  
      /**
       * Cache the paddingStart set by the user to append to the scrollbar's size.
       *
       */
      @ViewDebug.ExportedProperty(category = "padding")
      int mUserPaddingStart;
  
      /**
       * Cache the paddingEnd set by the user to append to the scrollbar's size.
       *
       */
      @ViewDebug.ExportedProperty(category = "padding")
      int mUserPaddingEnd;
  
      /**
       * The left padding as set by a setter method, a background's padding, or via XML property
       * resolution. This value is the padding before LTR resolution or taking account of scrollbars.
       *
       * @hide
       */
      int mUserPaddingLeftInitial;
  
      /**
       * The right padding as set by a setter method, a background's padding, or via XML property
       * resolution. This value is the padding before LTR resolution or taking account of scrollbars.
       *
       * @hide
       */
      int mUserPaddingRightInitial;
  
      /**
       * Default undefined padding
       */
      private static final int UNDEFINED_PADDING = Integer.MIN_VALUE;
  
      /**
       * Cache if a left padding has been defined explicitly via padding, horizontal padding,
       * or leftPadding in XML, or by setPadding(...) or setRelativePadding(...)
       */
      private boolean mLeftPaddingDefined = false;
  
      /**
       * Cache if a right padding has been defined explicitly via padding, horizontal padding,
       * or rightPadding in XML, or by setPadding(...) or setRelativePadding(...)
       */
      private boolean mRightPaddingDefined = false;
  
      /**
       * @hide
       */
      int mOldWidthMeasureSpec = Integer.MIN_VALUE;
      /**
       * @hide
       */
      int mOldHeightMeasureSpec = Integer.MIN_VALUE;
  
      private LongSparseLongArray mMeasureCache;
  
      @ViewDebug.ExportedProperty(deepExport = true, prefix = "bg_")
      @UnsupportedAppUsage
      private Drawable mBackground;
      private TintInfo mBackgroundTint;
  
      @ViewDebug.ExportedProperty(deepExport = true, prefix = "fg_")
      private ForegroundInfo mForegroundInfo;
  
      private Drawable mScrollIndicatorDrawable;
  
      /**
       * RenderNode used for backgrounds.
       * <p>
       * When non-null and valid, this is expected to contain an up-to-date copy
       * of the background drawable. It is cleared on temporary detach, and reset
       * on cleanup.
       */
      private RenderNode mBackgroundRenderNode;
  
      @UnsupportedAppUsage
      private int mBackgroundResource;
      private boolean mBackgroundSizeChanged;
  
      /** The default focus highlight.
       * @see #mDefaultFocusHighlightEnabled
       * @see Drawable#hasFocusStateSpecified()
       */
      private Drawable mDefaultFocusHighlight;
      private Drawable mDefaultFocusHighlightCache;
      private boolean mDefaultFocusHighlightSizeChanged;
      /**
       * True if the default focus highlight is needed on the target device.
       */
      private static boolean sUseDefaultFocusHighlight;
  
      /**
       * True if zero-sized views can be focused.
       */
      private static boolean sCanFocusZeroSized;
  
      /**
       * Always assign focus if a focusable View is available.
       */
      private static boolean sAlwaysAssignFocus;
  
      private String mTransitionName;
  
      static class TintInfo {
          ColorStateList mTintList;
          BlendMode mBlendMode;
          boolean mHasTintMode;
          boolean mHasTintList;
      }
  
      private static class ForegroundInfo {
          private Drawable mDrawable;
          private TintInfo mTintInfo;
          private int mGravity = Gravity.FILL;
          private boolean mInsidePadding = true;
          private boolean mBoundsChanged = true;
          private final Rect mSelfBounds = new Rect();
          private final Rect mOverlayBounds = new Rect();
      }
  
      static class ListenerInfo {
          /**
           * Listener used to dispatch focus change events.
           * This field should be made private, so it is hidden from the SDK.
           * {@hide}
           */
          @UnsupportedAppUsage
          protected OnFocusChangeListener mOnFocusChangeListener;
  
          /**
           * Listeners for layout change events.
           */
          private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners;
  
          protected OnScrollChangeListener mOnScrollChangeListener;
  
          /**
           * Listeners for attach events.
           */
          private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners;
  
          /**
           * Listener used to dispatch click events.
           * This field should be made private, so it is hidden from the SDK.
           * {@hide}
           */
          @UnsupportedAppUsage
          public OnClickListener mOnClickListener;
  
          /**
           * Listener used to dispatch long click events.
           * This field should be made private, so it is hidden from the SDK.
           * {@hide}
           */
          @UnsupportedAppUsage
          protected OnLongClickListener mOnLongClickListener;
  
          /**
           * Listener used to dispatch context click events. This field should be made private, so it
           * is hidden from the SDK.
           * {@hide}
           */
          protected OnContextClickListener mOnContextClickListener;
  
          /**
           * Listener used to build the context menu.
           * This field should be made private, so it is hidden from the SDK.
           * {@hide}
           */
          @UnsupportedAppUsage
          protected OnCreateContextMenuListener mOnCreateContextMenuListener;
  
          @UnsupportedAppUsage
          private OnKeyListener mOnKeyListener;
  
          @UnsupportedAppUsage
          private OnTouchListener mOnTouchListener;
  
          @UnsupportedAppUsage
          private OnHoverListener mOnHoverListener;
  
          @UnsupportedAppUsage
          private OnGenericMotionListener mOnGenericMotionListener;
  
          @UnsupportedAppUsage
          private OnDragListener mOnDragListener;
  
          private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener;
  
          OnApplyWindowInsetsListener mOnApplyWindowInsetsListener;
  
          OnCapturedPointerListener mOnCapturedPointerListener;
  
          private ArrayList<OnUnhandledKeyEventListener> mUnhandledKeyListeners;
  
          private WindowInsetsAnimationListener mWindowInsetsAnimationListener;
  
          /**
           * This lives here since it's only valid for interactive views.
           */
          private List<Rect> mSystemGestureExclusionRects;
  
          /**
           * Used to track {@link #mSystemGestureExclusionRects}
           */
          public RenderNode.PositionUpdateListener mPositionUpdateListener;
      }
  
      @UnsupportedAppUsage
      ListenerInfo mListenerInfo;
  
      private static class TooltipInfo {
          /**
           * Text to be displayed in a tooltip popup.
           */
          @Nullable
          CharSequence mTooltipText;
  
          /**
           * View-relative position of the tooltip anchor point.
           */
          int mAnchorX;
          int mAnchorY;
  
          /**
           * The tooltip popup.
           */
          @Nullable
          TooltipPopup mTooltipPopup;
  
          /**
           * Set to true if the tooltip was shown as a result of a long click.
           */
          boolean mTooltipFromLongClick;
  
          /**
           * Keep these Runnables so that they can be used to reschedule.
           */
          Runnable mShowTooltipRunnable;
          Runnable mHideTooltipRunnable;
  
          /**
           * Hover move is ignored if it is within this distance in pixels from the previous one.
           */
          int mHoverSlop;
  
          /**
           * Update the anchor position if it significantly (that is by at least mHoverSlop)
           * different from the previously stored position. Ignoring insignificant changes
           * filters out the jitter which is typical for such input sources as stylus.
           *
           * @return True if the position has been updated.
           */
          private boolean updateAnchorPos(MotionEvent event) {
              final int newAnchorX = (int) event.getX();
              final int newAnchorY = (int) event.getY();
              if (Math.abs(newAnchorX - mAnchorX) <= mHoverSlop
                      && Math.abs(newAnchorY - mAnchorY) <= mHoverSlop) {
                  return false;
              }
              mAnchorX = newAnchorX;
              mAnchorY = newAnchorY;
              return true;
          }
  
          /**
           *  Clear the anchor position to ensure that the next change is considered significant.
           */
          private void clearAnchorPos() {
              mAnchorX = Integer.MAX_VALUE;
              mAnchorY = Integer.MAX_VALUE;
          }
      }
  
      TooltipInfo mTooltipInfo;
  
      // Temporary values used to hold (x,y) coordinates when delegating from the
      // two-arg performLongClick() method to the legacy no-arg version.
      private float mLongClickX = Float.NaN;
      private float mLongClickY = Float.NaN;
  
      /**
       * The application environment this view lives in.
       * This field should be made private, so it is hidden from the SDK.
       * {@hide}
       */
      @ViewDebug.ExportedProperty(deepExport = true)
      @UnsupportedAppUsage
      protected Context mContext;
  
      @UnsupportedAppUsage
      private final Resources mResources;
  
      @UnsupportedAppUsage
      private ScrollabilityCache mScrollCache;
  
      private int[] mDrawableState = null;
  
      ViewOutlineProvider mOutlineProvider = ViewOutlineProvider.BACKGROUND;
  
      /**
       * Animator that automatically runs based on state changes.
       */
      private StateListAnimator mStateListAnimator;
  
      /**
       * When this view has focus and the next focus is {@link #FOCUS_LEFT},
       * the user may specify which view to go to next.
       */
      private int mNextFocusLeftId = View.NO_ID;
  
      /**
       * When this view has focus and the next focus is {@link #FOCUS_RIGHT},
       * the user may specify which view to go to next.
       */
      private int mNextFocusRightId = View.NO_ID;
  
      /**
       * When this view has focus and the next focus is {@link #FOCUS_UP},
       * the user may specify which view to go to next.
       */
      private int mNextFocusUpId = View.NO_ID;
  
      /**
       * When this view has focus and the next focus is {@link #FOCUS_DOWN},
       * the user may specify which view to go to next.
       */
      private int mNextFocusDownId = View.NO_ID;
  
      /**
       * When this view has focus and the next focus is {@link #FOCUS_FORWARD},
       * the user may specify which view to go to next.
       */
      int mNextFocusForwardId = View.NO_ID;
  
      /**
       * User-specified next keyboard navigation cluster in the {@link #FOCUS_FORWARD} direction.
       *
       * @see #findUserSetNextKeyboardNavigationCluster(View, int)
       */
      int mNextClusterForwardId = View.NO_ID;
  
      /**
       * Whether this View should use a default focus highlight when it gets focused but doesn't
       * have {@link android.R.attr#state_focused} defined in its background.
       */
      boolean mDefaultFocusHighlightEnabled = true;
  
      private CheckForLongPress mPendingCheckForLongPress;
      @UnsupportedAppUsage
      private CheckForTap mPendingCheckForTap = null;
      private PerformClick mPerformClick;
      private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent;
  
      private UnsetPressedState mUnsetPressedState;
  
      /**
       * Whether the long press's action has been invoked.  The tap's action is invoked on the
       * up event while a long press is invoked as soon as the long press duration is reached, so
       * a long press could be performed before the tap is checked, in which case the tap's action
       * should not be invoked.
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
      private boolean mHasPerformedLongPress;
  
      /**
       * Whether a context click button is currently pressed down. This is true when the stylus is
       * touching the screen and the primary button has been pressed, or if a mouse's right button is
       * pressed. This is false once the button is released or if the stylus has been lifted.
       */
      private boolean mInContextButtonPress;
  
      /**
       * Whether the next up event should be ignored for the purposes of gesture recognition. This is
       * true after a stylus button press has occured, when the next up event should not be recognized
       * as a tap.
       */
      private boolean mIgnoreNextUpEvent;
  
      /**
       * The minimum height of the view. We'll try our best to have the height
       * of this view to at least this amount.
       */
      @ViewDebug.ExportedProperty(category = "measurement")
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
      private int mMinHeight;
  
      /**
       * The minimum width of the view. We'll try our best to have the width
       * of this view to at least this amount.
       */
      @ViewDebug.ExportedProperty(category = "measurement")
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
      private int mMinWidth;
  
      /**
       * The delegate to handle touch events that are physically in this view
       * but should be handled by another view.
       */
      private TouchDelegate mTouchDelegate = null;
  
      /**
       * While touch exploration is in use, set to true when hovering across boundaries and
       * inside the touch area of the delegate at receiving {@link MotionEvent#ACTION_HOVER_ENTER}
       * or {@link MotionEvent#ACTION_HOVER_MOVE}. False when leaving boundaries or receiving a
       * {@link MotionEvent#ACTION_HOVER_EXIT}.
       * Note that children of view group are excluded in the touch area.
       * @see #dispatchTouchExplorationHoverEvent
       */
      private boolean mHoveringTouchDelegate = false;
  
      /**
       * Solid color to use as a background when creating the drawing cache. Enables
       * the cache to use 16 bit bitmaps instead of 32 bit.
       */
      private int mDrawingCacheBackgroundColor = 0;
  
      /**
       * Special tree observer used when mAttachInfo is null.
       */
      private ViewTreeObserver mFloatingTreeObserver;
  
      /**
       * Cache the touch slop from the context that created the view.
       */
      private int mTouchSlop;
  
      /**
       * Object that handles automatic animation of view properties.
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
      private ViewPropertyAnimator mAnimator = null;
  
      /**
       * List of registered FrameMetricsObservers.
       */
      private ArrayList<FrameMetricsObserver> mFrameMetricsObservers;
  
      /**
       * Flag indicating that a drag can cross window boundaries.  When
       * {@link #startDragAndDrop(ClipData, DragShadowBuilder, Object, int)} is called
       * with this flag set, all visible applications with targetSdkVersion >=
       * {@link android.os.Build.VERSION_CODES#N API 24} will be able to participate
       * in the drag operation and receive the dragged content.
       *
       * <p>If this is the only flag set, then the drag recipient will only have access to text data
       * and intents contained in the {@link ClipData} object. Access to URIs contained in the
       * {@link ClipData} is determined by other DRAG_FLAG_GLOBAL_* flags</p>
       */
      public static final int DRAG_FLAG_GLOBAL = 1 << 8;  // 256
  
      /**
       * When this flag is used with {@link #DRAG_FLAG_GLOBAL}, the drag recipient will be able to
       * request read access to the content URI(s) contained in the {@link ClipData} object.
       * @see android.content.Intent#FLAG_GRANT_READ_URI_PERMISSION
       */
      public static final int DRAG_FLAG_GLOBAL_URI_READ = Intent.FLAG_GRANT_READ_URI_PERMISSION;
  
      /**
       * When this flag is used with {@link #DRAG_FLAG_GLOBAL}, the drag recipient will be able to
       * request write access to the content URI(s) contained in the {@link ClipData} object.
       * @see android.content.Intent#FLAG_GRANT_WRITE_URI_PERMISSION
       */
      public static final int DRAG_FLAG_GLOBAL_URI_WRITE = Intent.FLAG_GRANT_WRITE_URI_PERMISSION;
  
      /**
       * When this flag is used with {@link #DRAG_FLAG_GLOBAL_URI_READ} and/or {@link
       * #DRAG_FLAG_GLOBAL_URI_WRITE}, the URI permission grant can be persisted across device
       * reboots until explicitly revoked with
       * {@link android.content.Context#revokeUriPermission(Uri, int)} Context.revokeUriPermission}.
       * @see android.content.Intent#FLAG_GRANT_PERSISTABLE_URI_PERMISSION
       */
      public static final int DRAG_FLAG_GLOBAL_PERSISTABLE_URI_PERMISSION =
              Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION;
  
      /**
       * When this flag is used with {@link #DRAG_FLAG_GLOBAL_URI_READ} and/or {@link
       * #DRAG_FLAG_GLOBAL_URI_WRITE}, the URI permission grant applies to any URI that is a prefix
       * match against the original granted URI.
       * @see android.content.Intent#FLAG_GRANT_PREFIX_URI_PERMISSION
       */
      public static final int DRAG_FLAG_GLOBAL_PREFIX_URI_PERMISSION =
              Intent.FLAG_GRANT_PREFIX_URI_PERMISSION;
  
      /**
       * Flag indicating that the drag shadow will be opaque.  When
       * {@link #startDragAndDrop(ClipData, DragShadowBuilder, Object, int)} is called
       * with this flag set, the drag shadow will be opaque, otherwise, it will be semitransparent.
       */
      public static final int DRAG_FLAG_OPAQUE = 1 << 9;
  
      /**
       * Vertical scroll factor cached by {@link #getVerticalScrollFactor}.
       */
      private float mVerticalScrollFactor;
  
      /**
       * Position of the vertical scroll bar.
       */
      @UnsupportedAppUsage
      private int mVerticalScrollbarPosition;
  
      /**
       * Position the scroll bar at the default position as determined by the system.
       */
      public static final int SCROLLBAR_POSITION_DEFAULT = 0;
  
      /**
       * Position the scroll bar along the left edge.
       */
      public static final int SCROLLBAR_POSITION_LEFT = 1;
  
      /**
       * Position the scroll bar along the right edge.
       */
      public static final int SCROLLBAR_POSITION_RIGHT = 2;
  
      /**
       * Indicates that the view does not have a layer.
       *
       * @see #getLayerType()
       * @see #setLayerType(int, android.graphics.Paint)
       * @see #LAYER_TYPE_SOFTWARE
       * @see #LAYER_TYPE_HARDWARE
       */
      public static final int LAYER_TYPE_NONE = 0;
  
      /**
       * <p>Indicates that the view has a software layer. A software layer is backed
       * by a bitmap and causes the view to be rendered using Android's software
       * rendering pipeline, even if hardware acceleration is enabled.</p>
       *
       * <p>Software layers have various usages:</p>
       * <p>When the application is not using hardware acceleration, a software layer
       * is useful to apply a specific color filter and/or blending mode and/or
       * translucency to a view and all its children.</p>
       * <p>When the application is using hardware acceleration, a software layer
       * is useful to render drawing primitives not supported by the hardware
       * accelerated pipeline. It can also be used to cache a complex view tree
       * into a texture and reduce the complexity of drawing operations. For instance,
       * when animating a complex view tree with a translation, a software layer can
       * be used to render the view tree only once.</p>
       * <p>Software layers should be avoided when the affected view tree updates
       * often. Every update will require to re-render the software layer, which can
       * potentially be slow (particularly when hardware acceleration is turned on
       * since the layer will have to be uploaded into a hardware texture after every
       * update.)</p>
       *
       * @see #getLayerType()
       * @see #setLayerType(int, android.graphics.Paint)
       * @see #LAYER_TYPE_NONE
       * @see #LAYER_TYPE_HARDWARE
       */
      public static final int LAYER_TYPE_SOFTWARE = 1;
  
      /**
       * <p>Indicates that the view has a hardware layer. A hardware layer is backed
       * by a hardware specific texture (generally Frame Buffer Objects or FBO on
       * OpenGL hardware) and causes the view to be rendered using Android's hardware
       * rendering pipeline, but only if hardware acceleration is turned on for the
       * view hierarchy. When hardware acceleration is turned off, hardware layers
       * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p>
       *
       * <p>A hardware layer is useful to apply a specific color filter and/or
       * blending mode and/or translucency to a view and all its children.</p>
       * <p>A hardware layer can be used to cache a complex view tree into a
       * texture and reduce the complexity of drawing operations. For instance,
       * when animating a complex view tree with a translation, a hardware layer can
       * be used to render the view tree only once.</p>
       * <p>A hardware layer can also be used to increase the rendering quality when
       * rotation transformations are applied on a view. It can also be used to
       * prevent potential clipping issues when applying 3D transforms on a view.</p>
       *
       * @see #getLayerType()
       * @see #setLayerType(int, android.graphics.Paint)
       * @see #LAYER_TYPE_NONE
       * @see #LAYER_TYPE_SOFTWARE
       */
      public static final int LAYER_TYPE_HARDWARE = 2;
  
      /** @hide */
      @IntDef(prefix = { "LAYER_TYPE_" }, value = {
              LAYER_TYPE_NONE,
              LAYER_TYPE_SOFTWARE,
              LAYER_TYPE_HARDWARE
      })
      @Retention(RetentionPolicy.SOURCE)
      public @interface LayerType {}
  
      @ViewDebug.ExportedProperty(category = "drawing", mapping = {
              @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"),
              @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"),
              @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE")
      })
      int mLayerType = LAYER_TYPE_NONE;
      Paint mLayerPaint;
  
      /**
       * Set to true when drawing cache is enabled and cannot be created.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public boolean mCachingFailed;
      @UnsupportedAppUsage
      private Bitmap mDrawingCache;
      @UnsupportedAppUsage
      private Bitmap mUnscaledDrawingCache;
  
      /**
       * RenderNode holding View properties, potentially holding a DisplayList of View content.
       * <p>
       * When non-null and valid, this is expected to contain an up-to-date copy
       * of the View content. Its DisplayList content is cleared on temporary detach and reset on
       * cleanup.
       */
      @UnsupportedAppUsage
      final RenderNode mRenderNode;
  
      /**
       * Set to true when the view is sending hover accessibility events because it
       * is the innermost hovered view.
       */
      private boolean mSendingHoverAccessibilityEvents;
  
      /**
       * Delegate for injecting accessibility functionality.
       */
      @UnsupportedAppUsage
      AccessibilityDelegate mAccessibilityDelegate;
  
      /**
       * The view's overlay layer. Developers get a reference to the overlay via getOverlay()
       * and add/remove objects to/from the overlay directly through the Overlay methods.
       */
      ViewOverlay mOverlay;
  
      /**
       * The currently active parent view for receiving delegated nested scrolling events.
       * This is set by {@link #startNestedScroll(int)} during a touch interaction and cleared
       * by {@link #stopNestedScroll()} at the same point where we clear
       * requestDisallowInterceptTouchEvent.
       */
      private ViewParent mNestedScrollingParent;
  
      /**
       * Consistency verifier for debugging purposes.
       * @hide
       */
      protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier =
              InputEventConsistencyVerifier.isInstrumentationEnabled() ?
                      new InputEventConsistencyVerifier(this, 0) : null;
  
      private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1);
  
      private int[] mTempNestedScrollConsumed;
  
      /**
       * An overlay is going to draw this View instead of being drawn as part of this
       * View's parent. mGhostView is the View in the Overlay that must be invalidated
       * when this view is invalidated.
       */
      GhostView mGhostView;
  
      /**
       * Holds pairs of adjacent attribute data: attribute name followed by its value.
       * @hide
       */
      @ViewDebug.ExportedProperty(category = "attributes", hasAdjacentMapping = true)
      public String[] mAttributes;
  
      /**
       * Maps a Resource id to its name.
       */
      private static SparseArray<String> mAttributeMap;
  
      /**
       * Queue of pending runnables. Used to postpone calls to post() until this
       * view is attached and has a handler.
       */
      private HandlerActionQueue mRunQueue;
  
      /**
       * The pointer icon when the mouse hovers on this view. The default is null.
       */
      private PointerIcon mPointerIcon;
  
      /**
       * @hide
       */
      @UnsupportedAppUsage
      String mStartActivityRequestWho;
  
      @Nullable
      private RoundScrollbarRenderer mRoundScrollbarRenderer;
  
      /** Used to delay visibility updates sent to the autofill manager */
      private Handler mVisibilityChangeForAutofillHandler;
  
      /**
       * Used when app developers explicitly set the {@link ContentCaptureSession} associated with the
       * view (through {@link #setContentCaptureSession(ContentCaptureSession)}.
       */
      @Nullable
      private ContentCaptureSession mContentCaptureSession;
  
      @LayoutRes
      private int mSourceLayoutId = ID_NULL;
  
      @Nullable
      private SparseIntArray mAttributeSourceResId;
  
      @Nullable
      private SparseArray<int[]> mAttributeResolutionStacks;
  
      @StyleRes
      private int mExplicitStyle;
  
      /**
       * Cached reference to the {@link ContentCaptureSession}, is reset on {@link #invalidate()}.
       */
      private ContentCaptureSession mCachedContentCaptureSession;
  
      /**
       * Simple constructor to use when creating a view from code.
       *
       * @param context The Context the view is running in, through which it can
       *        access the current theme, resources, etc.
       */
      public View(Context context) {
          mContext = context;
          mResources = context != null ? context.getResources() : null;
          mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED | FOCUSABLE_AUTO;
          // Set some flags defaults
          mPrivateFlags2 =
                  (LAYOUT_DIRECTION_DEFAULT << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) |
                  (TEXT_DIRECTION_DEFAULT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) |
                  (PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT) |
                  (TEXT_ALIGNMENT_DEFAULT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) |
                  (PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT) |
                  (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT);
          mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
          setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS);
          mUserPaddingStart = UNDEFINED_PADDING;
          mUserPaddingEnd = UNDEFINED_PADDING;
          mRenderNode = RenderNode.create(getClass().getName(), new ViewAnimationHostBridge(this));
  
          if (!sCompatibilityDone && context != null) {
              final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion;
  
              // Older apps may need this compatibility hack for measurement.
              sUseBrokenMakeMeasureSpec = targetSdkVersion <= Build.VERSION_CODES.JELLY_BEAN_MR1;
  
              // Older apps expect onMeasure() to always be called on a layout pass, regardless
              // of whether a layout was requested on that View.
              sIgnoreMeasureCache = targetSdkVersion < Build.VERSION_CODES.KITKAT;
  
              Canvas.sCompatibilityRestore = targetSdkVersion < Build.VERSION_CODES.M;
              Canvas.sCompatibilitySetBitmap = targetSdkVersion < Build.VERSION_CODES.O;
              Canvas.setCompatibilityVersion(targetSdkVersion);
  
              // In M and newer, our widgets can pass a "hint" value in the size
              // for UNSPECIFIED MeasureSpecs. This lets child views of scrolling containers
              // know what the expected parent size is going to be, so e.g. list items can size
              // themselves at 1/3 the size of their container. It breaks older apps though,
              // specifically apps that use some popular open source libraries.
              sUseZeroUnspecifiedMeasureSpec = targetSdkVersion < Build.VERSION_CODES.M;
  
              // Old versions of the platform would give different results from
              // LinearLayout measurement passes using EXACTLY and non-EXACTLY
              // modes, so we always need to run an additional EXACTLY pass.
              sAlwaysRemeasureExactly = targetSdkVersion <= Build.VERSION_CODES.M;
  
              // Prior to N, TextureView would silently ignore calls to setBackground/setForeground.
              // On N+, we throw, but that breaks compatibility with apps that use these methods.
              sTextureViewIgnoresDrawableSetters = targetSdkVersion <= Build.VERSION_CODES.M;
  
              // Prior to N, we would drop margins in LayoutParam conversions. The fix triggers bugs
              // in apps so we target check it to avoid breaking existing apps.
              sPreserveMarginParamsInLayoutParamConversion =
                      targetSdkVersion >= Build.VERSION_CODES.N;
  
              sCascadedDragDrop = targetSdkVersion < Build.VERSION_CODES.N;
  
              sHasFocusableExcludeAutoFocusable = targetSdkVersion < Build.VERSION_CODES.O;
  
              sAutoFocusableOffUIThreadWontNotifyParents = targetSdkVersion < Build.VERSION_CODES.O;
  
              sUseDefaultFocusHighlight = context.getResources().getBoolean(
                      com.android.internal.R.bool.config_useDefaultFocusHighlight);
  
              sThrowOnInvalidFloatProperties = targetSdkVersion >= Build.VERSION_CODES.P;
  
              sCanFocusZeroSized = targetSdkVersion < Build.VERSION_CODES.P;
  
              sAlwaysAssignFocus = targetSdkVersion < Build.VERSION_CODES.P;
  
              sAcceptZeroSizeDragShadow = targetSdkVersion < Build.VERSION_CODES.P;
  
              sBrokenInsetsDispatch = ViewRootImpl.sNewInsetsMode != NEW_INSETS_MODE_FULL
                      || targetSdkVersion < Build.VERSION_CODES.Q;
  
              sBrokenWindowBackground = targetSdkVersion < Build.VERSION_CODES.Q;
  
              sCompatibilityDone = true;
          }
      }
  
      /**
       * Constructor that is called when inflating a view from XML. This is called
       * when a view is being constructed from an XML file, supplying attributes
       * that were specified in the XML file. This version uses a default style of
       * 0, so the only attribute values applied are those in the Context's Theme
       * and the given AttributeSet.
       *
       * <p>
       * The method onFinishInflate() will be called after all children have been
       * added.
       *
       * @param context The Context the view is running in, through which it can
       *        access the current theme, resources, etc.
       * @param attrs The attributes of the XML tag that is inflating the view.
       * @see #View(Context, AttributeSet, int)
       */
      public View(Context context, @Nullable AttributeSet attrs) {
          this(context, attrs, 0);
      }
  
      /**
       * Perform inflation from XML and apply a class-specific base style from a
       * theme attribute. This constructor of View allows subclasses to use their
       * own base style when they are inflating. For example, a Button class's
       * constructor would call this version of the super class constructor and
       * supply <code>R.attr.buttonStyle</code> for <var>defStyleAttr</var>; this
       * allows the theme's button style to modify all of the base view attributes
       * (in particular its background) as well as the Button class's attributes.
       *
       * @param context The Context the view is running in, through which it can
       *        access the current theme, resources, etc.
       * @param attrs The attributes of the XML tag that is inflating the view.
       * @param defStyleAttr An attribute in the current theme that contains a
       *        reference to a style resource that supplies default values for
       *        the view. Can be 0 to not look for defaults.
       * @see #View(Context, AttributeSet)
       */
      public View(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
          this(context, attrs, defStyleAttr, 0);
      }
  
      /**
       * Perform inflation from XML and apply a class-specific base style from a
       * theme attribute or style resource. This constructor of View allows
       * subclasses to use their own base style when they are inflating.
       * <p>
       * When determining the final value of a particular attribute, there are
       * four inputs that come into play:
       * <ol>
       * <li>Any attribute values in the given AttributeSet.
       * <li>The style resource specified in the AttributeSet (named "style").
       * <li>The default style specified by <var>defStyleAttr</var>.
       * <li>The default style specified by <var>defStyleRes</var>.
       * <li>The base values in this theme.
       * </ol>
       * <p>
       * Each of these inputs is considered in-order, with the first listed taking
       * precedence over the following ones. In other words, if in the
       * AttributeSet you have supplied <code>&lt;Button * textColor="#ff000000"&gt;</code>
       * , then the button's text will <em>always</em> be black, regardless of
       * what is specified in any of the styles.
       *
       * @param context The Context the view is running in, through which it can
       *        access the current theme, resources, etc.
       * @param attrs The attributes of the XML tag that is inflating the view.
       * @param defStyleAttr An attribute in the current theme that contains a
       *        reference to a style resource that supplies default values for
       *        the view. Can be 0 to not look for defaults.
       * @param defStyleRes A resource identifier of a style resource that
       *        supplies default values for the view, used only if
       *        defStyleAttr is 0 or can not be found in the theme. Can be 0
       *        to not look for defaults.
       * @see #View(Context, AttributeSet, int)
       */
      public View(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
          this(context);
  
          mSourceLayoutId = Resources.getAttributeSetSourceResId(attrs);
  
          final TypedArray a = context.obtainStyledAttributes(
                  attrs, com.android.internal.R.styleable.View, defStyleAttr, defStyleRes);
  
          retrieveExplicitStyle(context.getTheme(), attrs);
          saveAttributeDataForStyleable(context, com.android.internal.R.styleable.View, attrs, a,
                  defStyleAttr, defStyleRes);
  
          if (sDebugViewAttributes) {
              saveAttributeData(attrs, a);
          }
  
          Drawable background = null;
  
          int leftPadding = -1;
          int topPadding = -1;
          int rightPadding = -1;
          int bottomPadding = -1;
          int startPadding = UNDEFINED_PADDING;
          int endPadding = UNDEFINED_PADDING;
  
          int padding = -1;
          int paddingHorizontal = -1;
          int paddingVertical = -1;
  
          int viewFlagValues = 0;
          int viewFlagMasks = 0;
  
          boolean setScrollContainer = false;
  
          int x = 0;
          int y = 0;
  
          float tx = 0;
          float ty = 0;
          float tz = 0;
          float elevation = 0;
          float rotation = 0;
          float rotationX = 0;
          float rotationY = 0;
          float sx = 1f;
          float sy = 1f;
          boolean transformSet = false;
  
          int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY;
          int overScrollMode = mOverScrollMode;
          boolean initializeScrollbars = false;
          boolean initializeScrollIndicators = false;
  
          boolean startPaddingDefined = false;
          boolean endPaddingDefined = false;
          boolean leftPaddingDefined = false;
          boolean rightPaddingDefined = false;
  
          final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion;
  
          // Set default values.
          viewFlagValues |= FOCUSABLE_AUTO;
          viewFlagMasks |= FOCUSABLE_AUTO;
  
          final int N = a.getIndexCount();
          for (int i = 0; i < N; i++) {
              int attr = a.getIndex(i);
              switch (attr) {
                  case com.android.internal.R.styleable.View_background:
                      background = a.getDrawable(attr);
                      break;
                  case com.android.internal.R.styleable.View_padding:
                      padding = a.getDimensionPixelSize(attr, -1);
                      mUserPaddingLeftInitial = padding;
                      mUserPaddingRightInitial = padding;
                      leftPaddingDefined = true;
                      rightPaddingDefined = true;
                      break;
                  case com.android.internal.R.styleable.View_paddingHorizontal:
                      paddingHorizontal = a.getDimensionPixelSize(attr, -1);
                      mUserPaddingLeftInitial = paddingHorizontal;
                      mUserPaddingRightInitial = paddingHorizontal;
                      leftPaddingDefined = true;
                      rightPaddingDefined = true;
                      break;
                  case com.android.internal.R.styleable.View_paddingVertical:
                      paddingVertical = a.getDimensionPixelSize(attr, -1);
                      break;
                  case com.android.internal.R.styleable.View_paddingLeft:
                      leftPadding = a.getDimensionPixelSize(attr, -1);
                      mUserPaddingLeftInitial = leftPadding;
                      leftPaddingDefined = true;
                      break;
                  case com.android.internal.R.styleable.View_paddingTop:
                      topPadding = a.getDimensionPixelSize(attr, -1);
                      break;
                  case com.android.internal.R.styleable.View_paddingRight:
                      rightPadding = a.getDimensionPixelSize(attr, -1);
                      mUserPaddingRightInitial = rightPadding;
                      rightPaddingDefined = true;
                      break;
                  case com.android.internal.R.styleable.View_paddingBottom:
                      bottomPadding = a.getDimensionPixelSize(attr, -1);
                      break;
                  case com.android.internal.R.styleable.View_paddingStart:
                      startPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING);
                      startPaddingDefined = (startPadding != UNDEFINED_PADDING);
                      break;
                  case com.android.internal.R.styleable.View_paddingEnd:
                      endPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING);
                      endPaddingDefined = (endPadding != UNDEFINED_PADDING);
                      break;
                  case com.android.internal.R.styleable.View_scrollX:
                      x = a.getDimensionPixelOffset(attr, 0);
                      break;
                  case com.android.internal.R.styleable.View_scrollY:
                      y = a.getDimensionPixelOffset(attr, 0);
                      break;
                  case com.android.internal.R.styleable.View_alpha:
                      setAlpha(a.getFloat(attr, 1f));
                      break;
                  case com.android.internal.R.styleable.View_transformPivotX:
                      setPivotX(a.getDimension(attr, 0));
                      break;
                  case com.android.internal.R.styleable.View_transformPivotY:
                      setPivotY(a.getDimension(attr, 0));
                      break;
                  case com.android.internal.R.styleable.View_translationX:
                      tx = a.getDimension(attr, 0);
                      transformSet = true;
                      break;
                  case com.android.internal.R.styleable.View_translationY:
                      ty = a.getDimension(attr, 0);
                      transformSet = true;
                      break;
                  case com.android.internal.R.styleable.View_translationZ:
                      tz = a.getDimension(attr, 0);
                      transformSet = true;
                      break;
                  case com.android.internal.R.styleable.View_elevation:
                      elevation = a.getDimension(attr, 0);
                      transformSet = true;
                      break;
                  case com.android.internal.R.styleable.View_rotation:
                      rotation = a.getFloat(attr, 0);
                      transformSet = true;
                      break;
                  case com.android.internal.R.styleable.View_rotationX:
                      rotationX = a.getFloat(attr, 0);
                      transformSet = true;
                      break;
                  case com.android.internal.R.styleable.View_rotationY:
                      rotationY = a.getFloat(attr, 0);
                      transformSet = true;
                      break;
                  case com.android.internal.R.styleable.View_scaleX:
                      sx = a.getFloat(attr, 1f);
                      transformSet = true;
                      break;
                  case com.android.internal.R.styleable.View_scaleY:
                      sy = a.getFloat(attr, 1f);
                      transformSet = true;
                      break;
                  case com.android.internal.R.styleable.View_id:
                      mID = a.getResourceId(attr, NO_ID);
                      break;
                  case com.android.internal.R.styleable.View_tag:
                      mTag = a.getText(attr);
                      break;
                  case com.android.internal.R.styleable.View_fitsSystemWindows:
                      if (a.getBoolean(attr, false)) {
                          viewFlagValues |= FITS_SYSTEM_WINDOWS;
                          viewFlagMasks |= FITS_SYSTEM_WINDOWS;
                      }
                      break;
                  case com.android.internal.R.styleable.View_focusable:
                      viewFlagValues = (viewFlagValues & ~FOCUSABLE_MASK) | getFocusableAttribute(a);
                      if ((viewFlagValues & FOCUSABLE_AUTO) == 0) {
                          viewFlagMasks |= FOCUSABLE_MASK;
                      }
                      break;
                  case com.android.internal.R.styleable.View_focusableInTouchMode:
                      if (a.getBoolean(attr, false)) {
                          // unset auto focus since focusableInTouchMode implies explicit focusable
                          viewFlagValues &= ~FOCUSABLE_AUTO;
                          viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE;
                          viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK;
                      }
                      break;
                  case com.android.internal.R.styleable.View_clickable:
                      if (a.getBoolean(attr, false)) {
                          viewFlagValues |= CLICKABLE;
                          viewFlagMasks |= CLICKABLE;
                      }
                      break;
                  case com.android.internal.R.styleable.View_longClickable:
                      if (a.getBoolean(attr, false)) {
                          viewFlagValues |= LONG_CLICKABLE;
                          viewFlagMasks |= LONG_CLICKABLE;
                      }
                      break;
                  case com.android.internal.R.styleable.View_contextClickable:
                      if (a.getBoolean(attr, false)) {
                          viewFlagValues |= CONTEXT_CLICKABLE;
                          viewFlagMasks |= CONTEXT_CLICKABLE;
                      }
                      break;
                  case com.android.internal.R.styleable.View_saveEnabled:
                      if (!a.getBoolean(attr, true)) {
                          viewFlagValues |= SAVE_DISABLED;
                          viewFlagMasks |= SAVE_DISABLED_MASK;
                      }
                      break;
                  case com.android.internal.R.styleable.View_duplicateParentState:
                      if (a.getBoolean(attr, false)) {
                          viewFlagValues |= DUPLICATE_PARENT_STATE;
                          viewFlagMasks |= DUPLICATE_PARENT_STATE;
                      }
                      break;
                  case com.android.internal.R.styleable.View_visibility:
                      final int visibility = a.getInt(attr, 0);
                      if (visibility != 0) {
                          viewFlagValues |= VISIBILITY_FLAGS[visibility];
                          viewFlagMasks |= VISIBILITY_MASK;
                      }
                      break;
                  case com.android.internal.R.styleable.View_layoutDirection:
                      // Clear any layout direction flags (included resolved bits) already set
                      mPrivateFlags2 &=
                              ~(PFLAG2_LAYOUT_DIRECTION_MASK | PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK);
                      // Set the layout direction flags depending on the value of the attribute
                      final int layoutDirection = a.getInt(attr, -1);
                      final int value = (layoutDirection != -1) ?
                              LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT;
                      mPrivateFlags2 |= (value << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT);
                      break;
                  case com.android.internal.R.styleable.View_drawingCacheQuality:
                      final int cacheQuality = a.getInt(attr, 0);
                      if (cacheQuality != 0) {
                          viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality];
                          viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK;
                      }
                      break;
                  case com.android.internal.R.styleable.View_contentDescription:
                      setContentDescription(a.getString(attr));
                      break;
                  case com.android.internal.R.styleable.View_accessibilityTraversalBefore:
                      setAccessibilityTraversalBefore(a.getResourceId(attr, NO_ID));
                      break;
                  case com.android.internal.R.styleable.View_accessibilityTraversalAfter:
                      setAccessibilityTraversalAfter(a.getResourceId(attr, NO_ID));
                      break;
                  case com.android.internal.R.styleable.View_labelFor:
                      setLabelFor(a.getResourceId(attr, NO_ID));
                      break;
                  case com.android.internal.R.styleable.View_soundEffectsEnabled:
                      if (!a.getBoolean(attr, true)) {
                          viewFlagValues &= ~SOUND_EFFECTS_ENABLED;
                          viewFlagMasks |= SOUND_EFFECTS_ENABLED;
                      }
                      break;
                  case com.android.internal.R.styleable.View_hapticFeedbackEnabled:
                      if (!a.getBoolean(attr, true)) {
                          viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED;
                          viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED;
                      }
                      break;
                  case R.styleable.View_scrollbars:
                      final int scrollbars = a.getInt(attr, SCROLLBARS_NONE);
                      if (scrollbars != SCROLLBARS_NONE) {
                          viewFlagValues |= scrollbars;
                          viewFlagMasks |= SCROLLBARS_MASK;
                          initializeScrollbars = true;
                      }
                      break;
                  //noinspection deprecation
                  case R.styleable.View_fadingEdge:
                      if (targetSdkVersion >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
                          // Ignore the attribute starting with ICS
                          break;
                      }
                      // With builds < ICS, fall through and apply fading edges
                  case R.styleable.View_requiresFadingEdge:
                      final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE);
                      if (fadingEdge != FADING_EDGE_NONE) {
                          viewFlagValues |= fadingEdge;
                          viewFlagMasks |= FADING_EDGE_MASK;
                          initializeFadingEdgeInternal(a);
                      }
                      break;
                  case R.styleable.View_scrollbarStyle:
                      scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY);
                      if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) {
                          viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK;
                          viewFlagMasks |= SCROLLBARS_STYLE_MASK;
                      }
                      break;
                  case R.styleable.View_isScrollContainer:
                      setScrollContainer = true;
                      if (a.getBoolean(attr, false)) {
                          setScrollContainer(true);
                      }
                      break;
                  case com.android.internal.R.styleable.View_keepScreenOn:
                      if (a.getBoolean(attr, false)) {
                          viewFlagValues |= KEEP_SCREEN_ON;
                          viewFlagMasks |= KEEP_SCREEN_ON;
                      }
                      break;
                  case R.styleable.View_filterTouchesWhenObscured:
                      if (a.getBoolean(attr, false)) {
                          viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED;
                          viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED;
                      }
                      break;
                  case R.styleable.View_nextFocusLeft:
                      mNextFocusLeftId = a.getResourceId(attr, View.NO_ID);
                      break;
                  case R.styleable.View_nextFocusRight:
                      mNextFocusRightId = a.getResourceId(attr, View.NO_ID);
                      break;
                  case R.styleable.View_nextFocusUp:
                      mNextFocusUpId = a.getResourceId(attr, View.NO_ID);
                      break;
                  case R.styleable.View_nextFocusDown:
                      mNextFocusDownId = a.getResourceId(attr, View.NO_ID);
                      break;
                  case R.styleable.View_nextFocusForward:
                      mNextFocusForwardId = a.getResourceId(attr, View.NO_ID);
                      break;
                  case R.styleable.View_nextClusterForward:
                      mNextClusterForwardId = a.getResourceId(attr, View.NO_ID);
                      break;
                  case R.styleable.View_minWidth:
                      mMinWidth = a.getDimensionPixelSize(attr, 0);
                      break;
                  case R.styleable.View_minHeight:
                      mMinHeight = a.getDimensionPixelSize(attr, 0);
                      break;
                  case R.styleable.View_onClick:
                      if (context.isRestricted()) {
                          throw new IllegalStateException("The android:onClick attribute cannot "
                                  + "be used within a restricted context");
                      }
  
                      final String handlerName = a.getString(attr);
                      if (handlerName != null) {
                          setOnClickListener(new DeclaredOnClickListener(this, handlerName));
                      }
                      break;
                  case R.styleable.View_overScrollMode:
                      overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS);
                      break;
                  case R.styleable.View_verticalScrollbarPosition:
                      mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT);
                      break;
                  case R.styleable.View_layerType:
                      setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null);
                      break;
                  case R.styleable.View_textDirection:
                      // Clear any text direction flag already set
                      mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK;
                      // Set the text direction flags depending on the value of the attribute
                      final int textDirection = a.getInt(attr, -1);
                      if (textDirection != -1) {
                          mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_FLAGS[textDirection];
                      }
                      break;
                  case R.styleable.View_textAlignment:
                      // Clear any text alignment flag already set
                      mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK;
                      // Set the text alignment flag depending on the value of the attribute
                      final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT);
                      mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_FLAGS[textAlignment];
                      break;
                  case R.styleable.View_importantForAccessibility:
                      setImportantForAccessibility(a.getInt(attr,
                              IMPORTANT_FOR_ACCESSIBILITY_DEFAULT));
                      break;
                  case R.styleable.View_accessibilityLiveRegion:
                      setAccessibilityLiveRegion(a.getInt(attr, ACCESSIBILITY_LIVE_REGION_DEFAULT));
                      break;
                  case R.styleable.View_transitionName:
                      setTransitionName(a.getString(attr));
                      break;
                  case R.styleable.View_nestedScrollingEnabled:
                      setNestedScrollingEnabled(a.getBoolean(attr, false));
                      break;
                  case R.styleable.View_stateListAnimator:
                      setStateListAnimator(AnimatorInflater.loadStateListAnimator(context,
                              a.getResourceId(attr, 0)));
                      break;
                  case R.styleable.View_backgroundTint:
                      // This will get applied later during setBackground().
                      if (mBackgroundTint == null) {
                          mBackgroundTint = new TintInfo();
                      }
                      mBackgroundTint.mTintList = a.getColorStateList(
                              R.styleable.View_backgroundTint);
                      mBackgroundTint.mHasTintList = true;
                      break;
                  case R.styleable.View_backgroundTintMode:
                      // This will get applied later during setBackground().
                      if (mBackgroundTint == null) {
                          mBackgroundTint = new TintInfo();
                      }
                      mBackgroundTint.mBlendMode = Drawable.parseBlendMode(a.getInt(
                              R.styleable.View_backgroundTintMode, -1), null);
                      mBackgroundTint.mHasTintMode = true;
                      break;
                  case R.styleable.View_outlineProvider:
                      setOutlineProviderFromAttribute(a.getInt(R.styleable.View_outlineProvider,
                              PROVIDER_BACKGROUND));
                      break;
                  case R.styleable.View_foreground:
                      if (targetSdkVersion >= Build.VERSION_CODES.M || this instanceof FrameLayout) {
                          setForeground(a.getDrawable(attr));
                      }
                      break;
                  case R.styleable.View_foregroundGravity:
                      if (targetSdkVersion >= Build.VERSION_CODES.M || this instanceof FrameLayout) {
                          setForegroundGravity(a.getInt(attr, Gravity.NO_GRAVITY));
                      }
                      break;
                  case R.styleable.View_foregroundTintMode:
                      if (targetSdkVersion >= Build.VERSION_CODES.M || this instanceof FrameLayout) {
                          setForegroundTintBlendMode(
                                  Drawable.parseBlendMode(a.getInt(attr, -1),
                                          null));
                      }
                      break;
                  case R.styleable.View_foregroundTint:
                      if (targetSdkVersion >= Build.VERSION_CODES.M || this instanceof FrameLayout) {
                          setForegroundTintList(a.getColorStateList(attr));
                      }
                      break;
                  case R.styleable.View_foregroundInsidePadding:
                      if (targetSdkVersion >= Build.VERSION_CODES.M || this instanceof FrameLayout) {
                          if (mForegroundInfo == null) {
                              mForegroundInfo = new ForegroundInfo();
                          }
                          mForegroundInfo.mInsidePadding = a.getBoolean(attr,
                                  mForegroundInfo.mInsidePadding);
                      }
                      break;
                  case R.styleable.View_scrollIndicators:
                      final int scrollIndicators =
                              (a.getInt(attr, 0) << SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT)
                                      & SCROLL_INDICATORS_PFLAG3_MASK;
                      if (scrollIndicators != 0) {
                          mPrivateFlags3 |= scrollIndicators;
                          initializeScrollIndicators = true;
                      }
                      break;
                  case R.styleable.View_pointerIcon:
                      final int resourceId = a.getResourceId(attr, 0);
                      if (resourceId != 0) {
                          setPointerIcon(PointerIcon.load(
                                  context.getResources(), resourceId));
                      } else {
                          final int pointerType = a.getInt(attr, PointerIcon.TYPE_NOT_SPECIFIED);
                          if (pointerType != PointerIcon.TYPE_NOT_SPECIFIED) {
                              setPointerIcon(PointerIcon.getSystemIcon(context, pointerType));
                          }
                      }
                      break;
                  case R.styleable.View_forceHasOverlappingRendering:
                      if (a.peekValue(attr) != null) {
                          forceHasOverlappingRendering(a.getBoolean(attr, true));
                      }
                      break;
                  case R.styleable.View_tooltipText:
                      setTooltipText(a.getText(attr));
                      break;
                  case R.styleable.View_keyboardNavigationCluster:
                      if (a.peekValue(attr) != null) {
                          setKeyboardNavigationCluster(a.getBoolean(attr, true));
                      }
                      break;
                  case R.styleable.View_focusedByDefault:
                      if (a.peekValue(attr) != null) {
                          setFocusedByDefault(a.getBoolean(attr, true));
                      }
                      break;
                  case R.styleable.View_autofillHints:
                      if (a.peekValue(attr) != null) {
                          CharSequence[] rawHints = null;
                          String rawString = null;
  
                          if (a.getType(attr) == TypedValue.TYPE_REFERENCE) {
                              int resId = a.getResourceId(attr, 0);
  
                              try {
                                  rawHints = a.getTextArray(attr);
                              } catch (Resources.NotFoundException e) {
                                  rawString = getResources().getString(resId);
                              }
                          } else {
                              rawString = a.getString(attr);
                          }
  
                          if (rawHints == null) {
                              if (rawString == null) {
                                  throw new IllegalArgumentException(
                                          "Could not resolve autofillHints");
                              } else {
                                  rawHints = rawString.split(",");
                              }
                          }
  
                          String[] hints = new String[rawHints.length];
  
                          int numHints = rawHints.length;
                          for (int rawHintNum = 0; rawHintNum < numHints; rawHintNum++) {
                              hints[rawHintNum] = rawHints[rawHintNum].toString().trim();
                          }
                          setAutofillHints(hints);
                      }
                      break;
                  case R.styleable.View_importantForAutofill:
                      if (a.peekValue(attr) != null) {
                          setImportantForAutofill(a.getInt(attr, IMPORTANT_FOR_AUTOFILL_AUTO));
                      }
                      break;
                  case R.styleable.View_defaultFocusHighlightEnabled:
                      if (a.peekValue(attr) != null) {
                          setDefaultFocusHighlightEnabled(a.getBoolean(attr, true));
                      }
                      break;
                  case R.styleable.View_screenReaderFocusable:
                      if (a.peekValue(attr) != null) {
                          setScreenReaderFocusable(a.getBoolean(attr, false));
                      }
                      break;
                  case R.styleable.View_accessibilityPaneTitle:
                      if (a.peekValue(attr) != null) {
                          setAccessibilityPaneTitle(a.getString(attr));
                      }
                      break;
                  case R.styleable.View_outlineSpotShadowColor:
                      setOutlineSpotShadowColor(a.getColor(attr, Color.BLACK));
                      break;
                  case R.styleable.View_outlineAmbientShadowColor:
                      setOutlineAmbientShadowColor(a.getColor(attr, Color.BLACK));
                      break;
                  case com.android.internal.R.styleable.View_accessibilityHeading:
                      setAccessibilityHeading(a.getBoolean(attr, false));
                      break;
                  case R.styleable.View_forceDarkAllowed:
                      mRenderNode.setForceDarkAllowed(a.getBoolean(attr, true));
                      break;
              }
          }
  
          setOverScrollMode(overScrollMode);
  
          // Cache start/end user padding as we cannot fully resolve padding here (we don't have yet
          // the resolved layout direction). Those cached values will be used later during padding
          // resolution.
          mUserPaddingStart = startPadding;
          mUserPaddingEnd = endPadding;
  
          if (background != null) {
              setBackground(background);
          }
  
          // setBackground above will record that padding is currently provided by the background.
          // If we have padding specified via xml, record that here instead and use it.
          mLeftPaddingDefined = leftPaddingDefined;
          mRightPaddingDefined = rightPaddingDefined;
  
          // Valid paddingHorizontal/paddingVertical beats leftPadding, rightPadding, topPadding,
          // bottomPadding, and padding set by background.  Valid padding beats everything.
          if (padding >= 0) {
              leftPadding = padding;
              topPadding = padding;
              rightPadding = padding;
              bottomPadding = padding;
              mUserPaddingLeftInitial = padding;
              mUserPaddingRightInitial = padding;
          } else {
              if (paddingHorizontal >= 0) {
                  leftPadding = paddingHorizontal;
                  rightPadding = paddingHorizontal;
                  mUserPaddingLeftInitial = paddingHorizontal;
                  mUserPaddingRightInitial = paddingHorizontal;
              }
              if (paddingVertical >= 0) {
                  topPadding = paddingVertical;
                  bottomPadding = paddingVertical;
              }
          }
  
          if (isRtlCompatibilityMode()) {
              // RTL compatibility mode: pre Jelly Bean MR1 case OR no RTL support case.
              // left / right padding are used if defined (meaning here nothing to do). If they are not
              // defined and start / end padding are defined (e.g. in Frameworks resources), then we use
              // start / end and resolve them as left / right (layout direction is not taken into account).
              // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial
              // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if
              // defined.
              if (!mLeftPaddingDefined && startPaddingDefined) {
                  leftPadding = startPadding;
              }
              mUserPaddingLeftInitial = (leftPadding >= 0) ? leftPadding : mUserPaddingLeftInitial;
              if (!mRightPaddingDefined && endPaddingDefined) {
                  rightPadding = endPadding;
              }
              mUserPaddingRightInitial = (rightPadding >= 0) ? rightPadding : mUserPaddingRightInitial;
          } else {
              // Jelly Bean MR1 and after case: if start/end defined, they will override any left/right
              // values defined. Otherwise, left /right values are used.
              // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial
              // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if
              // defined.
              final boolean hasRelativePadding = startPaddingDefined || endPaddingDefined;
  
              if (mLeftPaddingDefined && !hasRelativePadding) {
                  mUserPaddingLeftInitial = leftPadding;
              }
              if (mRightPaddingDefined && !hasRelativePadding) {
                  mUserPaddingRightInitial = rightPadding;
              }
          }
  
          // mPaddingTop and mPaddingBottom may have been set by setBackground(Drawable) so must pass
          // them on if topPadding or bottomPadding are not valid.
          internalSetPadding(
                  mUserPaddingLeftInitial,
                  topPadding >= 0 ? topPadding : mPaddingTop,
                  mUserPaddingRightInitial,
                  bottomPadding >= 0 ? bottomPadding : mPaddingBottom);
  
          if (viewFlagMasks != 0) {
              setFlags(viewFlagValues, viewFlagMasks);
          }
  
          if (initializeScrollbars) {
              initializeScrollbarsInternal(a);
          }
  
          if (initializeScrollIndicators) {
              initializeScrollIndicatorsInternal();
          }
  
          a.recycle();
  
          // Needs to be called after mViewFlags is set
          if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) {
              recomputePadding();
          }
  
          if (x != 0 || y != 0) {
              scrollTo(x, y);
          }
  
          if (transformSet) {
              setTranslationX(tx);
              setTranslationY(ty);
              setTranslationZ(tz);
              setElevation(elevation);
              setRotation(rotation);
              setRotationX(rotationX);
              setRotationY(rotationY);
              setScaleX(sx);
              setScaleY(sy);
          }
  
          if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) {
              setScrollContainer(true);
          }
  
          computeOpaqueFlags();
      }
  
      /**
       * Returns the ordered list of resource ID that are considered when resolving attribute values
       * for this {@link View}. The list will include layout resource ID if the View is inflated from
       * XML. It will also include a set of explicit styles if specified in XML using
       * {@code style="..."}. Finally, it will include the default styles resolved from the theme.
       *
       * <p>
       * <b>Note:</b> this method will only return actual values if the view attribute debugging
       * is enabled in Android developer options.
       *
       * @param attribute Attribute resource ID for which the resolution stack should be returned.
       * @return ordered list of resource ID that are considered when resolving attribute values for
       * this {@link View}.
       */
      @NonNull
      public int[] getAttributeResolutionStack(@AttrRes int attribute) {
          if (!sDebugViewAttributes
                  || mAttributeResolutionStacks == null
                  || mAttributeResolutionStacks.get(attribute) == null) {
              return new int[0];
          }
          int[] attributeResolutionStack = mAttributeResolutionStacks.get(attribute);
          int stackSize = attributeResolutionStack.length;
          if (mSourceLayoutId != ID_NULL) {
              stackSize++;
          }
  
          int currentIndex = 0;
          int[] stack = new int[stackSize];
  
          if (mSourceLayoutId != ID_NULL) {
              stack[currentIndex] = mSourceLayoutId;
              currentIndex++;
          }
          for (int i = 0; i < attributeResolutionStack.length; i++) {
              stack[currentIndex] = attributeResolutionStack[i];
              currentIndex++;
          }
          return stack;
      }
  
      /**
       * Returns the mapping of attribute resource ID to source resource ID where the attribute value
       * was set. Source resource ID can either be a layout resource ID, if the value was set in XML
       * within the View tag, or a style resource ID, if the attribute was set in a style. The source
       * resource value will be one of the resource IDs from {@link #getAttributeSourceResourceMap()}.
       *
       * <p>
       * <b>Note:</b> this method will only return actual values if the view attribute debugging
       * is enabled in Android developer options.
       *
       * @return mapping of attribute resource ID to source resource ID where the attribute value
       * was set.
       */
      @NonNull
      public Map<Integer, Integer> getAttributeSourceResourceMap() {
          HashMap<Integer, Integer> map = new HashMap<>();
          if (!sDebugViewAttributes || mAttributeSourceResId == null) {
              return map;
          }
          for (int i = 0; i < mAttributeSourceResId.size(); i++) {
              map.put(mAttributeSourceResId.keyAt(i), mAttributeSourceResId.valueAt(i));
          }
          return map;
      }
  
      /**
       * Returns the resource ID for the style specified using {@code style="..."} in the
       * {@link AttributeSet}'s backing XML element or {@link Resources#ID_NULL} otherwise if not
       * specified or otherwise not applicable.
       * <p>
       * Each {@link View} can have an explicit style specified in the layout file.
       * This style is used first during the {@link View} attribute resolution, then if an attribute
       * is not defined there the resource system looks at default style and theme as fallbacks.
       *
       * <p>
       * <b>Note:</b> this method will only return actual values if the view attribute debugging
       * is enabled in Android developer options.
       *
       * @return The resource ID for the style specified using {@code style="..."} in the
       *      {@link AttributeSet}'s backing XML element or {@link Resources#ID_NULL} otherwise
       *      if not specified or otherwise not applicable.
       */
      @StyleRes
      public int getExplicitStyle() {
          if (!sDebugViewAttributes) {
              return ID_NULL;
          }
          return mExplicitStyle;
      }
  
      /**
       * An implementation of OnClickListener that attempts to lazily load a
       * named click handling method from a parent or ancestor context.
       */
      private static class DeclaredOnClickListener implements OnClickListener {
          private final View mHostView;
          private final String mMethodName;
  
          private Method mResolvedMethod;
          private Context mResolvedContext;
  
          public DeclaredOnClickListener(@NonNull View hostView, @NonNull String methodName) {
              mHostView = hostView;
              mMethodName = methodName;
          }
  
          @Override
          public void onClick(@NonNull View v) {
              if (mResolvedMethod == null) {
                  resolveMethod(mHostView.getContext(), mMethodName);
              }
  
              try {
                  mResolvedMethod.invoke(mResolvedContext, v);
              } catch (IllegalAccessException e) {
                  throw new IllegalStateException(
                          "Could not execute non-public method for android:onClick", e);
              } catch (InvocationTargetException e) {
                  throw new IllegalStateException(
                          "Could not execute method for android:onClick", e);
              }
          }
  
          @NonNull
          private void resolveMethod(@Nullable Context context, @NonNull String name) {
              while (context != null) {
                  try {
                      if (!context.isRestricted()) {
                          final Method method = context.getClass().getMethod(mMethodName, View.class);
                          if (method != null) {
                              mResolvedMethod = method;
                              mResolvedContext = context;
                              return;
                          }
                      }
                  } catch (NoSuchMethodException e) {
                      // Failed to find method, keep searching up the hierarchy.
                  }
  
                  if (context instanceof ContextWrapper) {
                      context = ((ContextWrapper) context).getBaseContext();
                  } else {
                      // Can't search up the hierarchy, null out and fail.
                      context = null;
                  }
              }
  
              final int id = mHostView.getId();
              final String idText = id == NO_ID ? "" : " with id '"
                      + mHostView.getContext().getResources().getResourceEntryName(id) + "'";
              throw new IllegalStateException("Could not find method " + mMethodName
                      + "(View) in a parent or ancestor Context for android:onClick "
                      + "attribute defined on view " + mHostView.getClass() + idText);
          }
      }
  
      /**
       * Non-public constructor for use in testing
       */
      @UnsupportedAppUsage
      View() {
          mResources = null;
          mRenderNode = RenderNode.create(getClass().getName(), new ViewAnimationHostBridge(this));
      }
  
      final boolean debugDraw() {
          return DEBUG_DRAW || mAttachInfo != null && mAttachInfo.mDebugLayout;
      }
  
      private static SparseArray<String> getAttributeMap() {
          if (mAttributeMap == null) {
              mAttributeMap = new SparseArray<>();
          }
          return mAttributeMap;
      }
  
      private void retrieveExplicitStyle(@NonNull Resources.Theme theme,
              @Nullable AttributeSet attrs) {
          if (!sDebugViewAttributes) {
              return;
          }
          mExplicitStyle = theme.getExplicitStyle(attrs);
      }
  
      /**
       * Stores debugging information about attributes. This should be called in a constructor by
       * every custom {@link View} that uses a custom styleable. If the custom view does not call it,
       * then the custom attributes used by this view will not be visible in layout inspection tools.
       *
       *  @param context Context under which this view is created.
       * @param styleable A reference to styleable array R.styleable.Foo
       * @param attrs AttributeSet used to construct this view.
       * @param t Resolved {@link TypedArray} returned by a call to
       *        {@link Resources#obtainAttributes(AttributeSet, int[])}.
       * @param defStyleAttr Default style attribute passed into the view constructor.
       * @param defStyleRes Default style resource passed into the view constructor.
       */
      public final void saveAttributeDataForStyleable(@NonNull Context context,
              @NonNull int[] styleable, @Nullable AttributeSet attrs, @NonNull TypedArray t,
              int defStyleAttr, int defStyleRes) {
          if (!sDebugViewAttributes) {
              return;
          }
  
          int[] attributeResolutionStack = context.getTheme().getAttributeResolutionStack(
                  defStyleAttr, defStyleRes, mExplicitStyle);
  
          if (mAttributeResolutionStacks == null) {
              mAttributeResolutionStacks = new SparseArray<>();
          }
  
          if (mAttributeSourceResId == null) {
              mAttributeSourceResId = new SparseIntArray();
          }
  
          final int indexCount = t.getIndexCount();
          for (int j = 0; j < indexCount; ++j) {
              final int index = t.getIndex(j);
              mAttributeSourceResId.append(styleable[index], t.getSourceResourceId(index, 0));
              mAttributeResolutionStacks.append(styleable[index], attributeResolutionStack);
          }
      }
  
      private void saveAttributeData(@Nullable AttributeSet attrs, @NonNull TypedArray t) {
          final int attrsCount = attrs == null ? 0 : attrs.getAttributeCount();
          final int indexCount = t.getIndexCount();
          final String[] attributes = new String[(attrsCount + indexCount) * 2];
  
          int i = 0;
  
          // Store raw XML attributes.
          for (int j = 0; j < attrsCount; ++j) {
              attributes[i] = attrs.getAttributeName(j);
              attributes[i + 1] = attrs.getAttributeValue(j);
              i += 2;
          }
  
          // Store resolved styleable attributes.
          final Resources res = t.getResources();
          final SparseArray<String> attributeMap = getAttributeMap();
          for (int j = 0; j < indexCount; ++j) {
              final int index = t.getIndex(j);
              if (!t.hasValueOrEmpty(index)) {
                  // Value is undefined. Skip it.
                  continue;
              }
  
              final int resourceId = t.getResourceId(index, 0);
              if (resourceId == 0) {
                  // Value is not a reference. Skip it.
                  continue;
              }
  
              String resourceName = attributeMap.get(resourceId);
              if (resourceName == null) {
                  try {
                      resourceName = res.getResourceName(resourceId);
                  } catch (Resources.NotFoundException e) {
                      resourceName = "0x" + Integer.toHexString(resourceId);
                  }
                  attributeMap.put(resourceId, resourceName);
              }
  
              attributes[i] = resourceName;
              attributes[i + 1] = t.getString(index);
              i += 2;
          }
  
          // Trim to fit contents.
          final String[] trimmed = new String[i];
          System.arraycopy(attributes, 0, trimmed, 0, i);
          mAttributes = trimmed;
      }
  
      @Override
      public String toString() {
          StringBuilder out = new StringBuilder(128);
          out.append(getClass().getName());
          out.append('{');
          out.append(Integer.toHexString(System.identityHashCode(this)));
          out.append(' ');
          switch (mViewFlags&VISIBILITY_MASK) {
              case VISIBLE: out.append('V'); break;
              case INVISIBLE: out.append('I'); break;
              case GONE: out.append('G'); break;
              default: out.append('.'); break;
          }
          out.append((mViewFlags & FOCUSABLE) == FOCUSABLE ? 'F' : '.');
          out.append((mViewFlags&ENABLED_MASK) == ENABLED ? 'E' : '.');
          out.append((mViewFlags&DRAW_MASK) == WILL_NOT_DRAW ? '.' : 'D');
          out.append((mViewFlags&SCROLLBARS_HORIZONTAL) != 0 ? 'H' : '.');
          out.append((mViewFlags&SCROLLBARS_VERTICAL) != 0 ? 'V' : '.');
          out.append((mViewFlags&CLICKABLE) != 0 ? 'C' : '.');
          out.append((mViewFlags&LONG_CLICKABLE) != 0 ? 'L' : '.');
          out.append((mViewFlags&CONTEXT_CLICKABLE) != 0 ? 'X' : '.');
          out.append(' ');
          out.append((mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0 ? 'R' : '.');
          out.append((mPrivateFlags&PFLAG_FOCUSED) != 0 ? 'F' : '.');
          out.append((mPrivateFlags&PFLAG_SELECTED) != 0 ? 'S' : '.');
          if ((mPrivateFlags&PFLAG_PREPRESSED) != 0) {
              out.append('p');
          } else {
              out.append((mPrivateFlags&PFLAG_PRESSED) != 0 ? 'P' : '.');
          }
          out.append((mPrivateFlags&PFLAG_HOVERED) != 0 ? 'H' : '.');
          out.append((mPrivateFlags&PFLAG_ACTIVATED) != 0 ? 'A' : '.');
          out.append((mPrivateFlags&PFLAG_INVALIDATED) != 0 ? 'I' : '.');
          out.append((mPrivateFlags&PFLAG_DIRTY_MASK) != 0 ? 'D' : '.');
          out.append(' ');
          out.append(mLeft);
          out.append(',');
          out.append(mTop);
          out.append('-');
          out.append(mRight);
          out.append(',');
          out.append(mBottom);
          final int id = getId();
          if (id != NO_ID) {
              out.append(" #");
              out.append(Integer.toHexString(id));
              final Resources r = mResources;
              if (id > 0 && Resources.resourceHasPackage(id) && r != null) {
                  try {
                      String pkgname;
                      switch (id&0xff000000) {
                          case 0x7f000000:
                              pkgname="app";
                              break;
                          case 0x01000000:
                              pkgname="android";
                              break;
                          default:
                              pkgname = r.getResourcePackageName(id);
                              break;
                      }
                      String typename = r.getResourceTypeName(id);
                      String entryname = r.getResourceEntryName(id);
                      out.append(" ");
                      out.append(pkgname);
                      out.append(":");
                      out.append(typename);
                      out.append("/");
                      out.append(entryname);
                  } catch (Resources.NotFoundException e) {
                  }
              }
          }
          if (mAutofillId != null) {
              out.append(" aid="); out.append(mAutofillId);
          }
          out.append("}");
          return out.toString();
      }
  
      /**
       * <p>
       * Initializes the fading edges from a given set of styled attributes. This
       * method should be called by subclasses that need fading edges and when an
       * instance of these subclasses is created programmatically rather than
       * being inflated from XML. This method is automatically called when the XML
       * is inflated.
       * </p>
       *
       * @param a the styled attributes set to initialize the fading edges from
       *
       * @removed
       */
      protected void initializeFadingEdge(TypedArray a) {
          // This method probably shouldn't have been included in the SDK to begin with.
          // It relies on 'a' having been initialized using an attribute filter array that is
          // not publicly available to the SDK. The old method has been renamed
          // to initializeFadingEdgeInternal and hidden for framework use only;
          // this one initializes using defaults to make it safe to call for apps.
  
          TypedArray arr = mContext.obtainStyledAttributes(com.android.internal.R.styleable.View);
  
          initializeFadingEdgeInternal(arr);
  
          arr.recycle();
      }
  
      /**
       * <p>
       * Initializes the fading edges from a given set of styled attributes. This
       * method should be called by subclasses that need fading edges and when an
       * instance of these subclasses is created programmatically rather than
       * being inflated from XML. This method is automatically called when the XML
       * is inflated.
       * </p>
       *
       * @param a the styled attributes set to initialize the fading edges from
       * @hide This is the real method; the public one is shimmed to be safe to call from apps.
       */
      protected void initializeFadingEdgeInternal(TypedArray a) {
          initScrollCache();
  
          mScrollCache.fadingEdgeLength = a.getDimensionPixelSize(
                  R.styleable.View_fadingEdgeLength,
                  ViewConfiguration.get(mContext).getScaledFadingEdgeLength());
      }
  
      /**
       * Returns the size of the vertical faded edges used to indicate that more
       * content in this view is visible.
       *
       * @return The size in pixels of the vertical faded edge or 0 if vertical
       *         faded edges are not enabled for this view.
       * @attr ref android.R.styleable#View_fadingEdgeLength
       */
      public int getVerticalFadingEdgeLength() {
          if (isVerticalFadingEdgeEnabled()) {
              ScrollabilityCache cache = mScrollCache;
              if (cache != null) {
                  return cache.fadingEdgeLength;
              }
          }
          return 0;
      }
  
      /**
       * Set the size of the faded edge used to indicate that more content in this
       * view is available.  Will not change whether the fading edge is enabled; use
       * {@link #setVerticalFadingEdgeEnabled(boolean)} or
       * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge
       * for the vertical or horizontal fading edges.
       *
       * @param length The size in pixels of the faded edge used to indicate that more
       *        content in this view is visible.
       */
      public void setFadingEdgeLength(int length) {
          initScrollCache();
          mScrollCache.fadingEdgeLength = length;
      }
  
      /**
       * Returns the size of the horizontal faded edges used to indicate that more
       * content in this view is visible.
       *
       * @return The size in pixels of the horizontal faded edge or 0 if horizontal
       *         faded edges are not enabled for this view.
       * @attr ref android.R.styleable#View_fadingEdgeLength
       */
      public int getHorizontalFadingEdgeLength() {
          if (isHorizontalFadingEdgeEnabled()) {
              ScrollabilityCache cache = mScrollCache;
              if (cache != null) {
                  return cache.fadingEdgeLength;
              }
          }
          return 0;
      }
  
      /**
       * Returns the width of the vertical scrollbar.
       *
       * @return The width in pixels of the vertical scrollbar or 0 if there
       *         is no vertical scrollbar.
       */
      public int getVerticalScrollbarWidth() {
          ScrollabilityCache cache = mScrollCache;
          if (cache != null) {
              ScrollBarDrawable scrollBar = cache.scrollBar;
              if (scrollBar != null) {
                  int size = scrollBar.getSize(true);
                  if (size <= 0) {
                      size = cache.scrollBarSize;
                  }
                  return size;
              }
              return 0;
          }
          return 0;
      }
  
      /**
       * Returns the height of the horizontal scrollbar.
       *
       * @return The height in pixels of the horizontal scrollbar or 0 if
       *         there is no horizontal scrollbar.
       */
      protected int getHorizontalScrollbarHeight() {
          ScrollabilityCache cache = mScrollCache;
          if (cache != null) {
              ScrollBarDrawable scrollBar = cache.scrollBar;
              if (scrollBar != null) {
                  int size = scrollBar.getSize(false);
                  if (size <= 0) {
                      size = cache.scrollBarSize;
                  }
                  return size;
              }
              return 0;
          }
          return 0;
      }
  
      /**
       * <p>
       * Initializes the scrollbars from a given set of styled attributes. This
       * method should be called by subclasses that need scrollbars and when an
       * instance of these subclasses is created programmatically rather than
       * being inflated from XML. This method is automatically called when the XML
       * is inflated.
       * </p>
       *
       * @param a the styled attributes set to initialize the scrollbars from
       *
       * @removed
       */
      protected void initializeScrollbars(TypedArray a) {
          // It's not safe to use this method from apps. The parameter 'a' must have been obtained
          // using the View filter array which is not available to the SDK. As such, internal
          // framework usage now uses initializeScrollbarsInternal and we grab a default
          // TypedArray with the right filter instead here.
          TypedArray arr = mContext.obtainStyledAttributes(com.android.internal.R.styleable.View);
  
          initializeScrollbarsInternal(arr);
  
          // We ignored the method parameter. Recycle the one we actually did use.
          arr.recycle();
      }
  
      private void initializeScrollBarDrawable() {
          initScrollCache();
  
          if (mScrollCache.scrollBar == null) {
              mScrollCache.scrollBar = new ScrollBarDrawable();
              mScrollCache.scrollBar.setState(getDrawableState());
              mScrollCache.scrollBar.setCallback(this);
          }
      }
  
      /**
       * <p>
       * Initializes the scrollbars from a given set of styled attributes. This
       * method should be called by subclasses that need scrollbars and when an
       * instance of these subclasses is created programmatically rather than
       * being inflated from XML. This method is automatically called when the XML
       * is inflated.
       * </p>
       *
       * @param a the styled attributes set to initialize the scrollbars from
       * @hide
       */
      @UnsupportedAppUsage
      protected void initializeScrollbarsInternal(TypedArray a) {
          initScrollCache();
  
          final ScrollabilityCache scrollabilityCache = mScrollCache;
  
          if (scrollabilityCache.scrollBar == null) {
              scrollabilityCache.scrollBar = new ScrollBarDrawable();
              scrollabilityCache.scrollBar.setState(getDrawableState());
              scrollabilityCache.scrollBar.setCallback(this);
          }
  
          final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true);
  
          if (!fadeScrollbars) {
              scrollabilityCache.state = ScrollabilityCache.ON;
          }
          scrollabilityCache.fadeScrollBars = fadeScrollbars;
  
  
          scrollabilityCache.scrollBarFadeDuration = a.getInt(
                  R.styleable.View_scrollbarFadeDuration, ViewConfiguration
                          .getScrollBarFadeDuration());
          scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt(
                  R.styleable.View_scrollbarDefaultDelayBeforeFade,
                  ViewConfiguration.getScrollDefaultDelay());
  
  
          scrollabilityCache.scrollBarSize = a.getDimensionPixelSize(
                  com.android.internal.R.styleable.View_scrollbarSize,
                  ViewConfiguration.get(mContext).getScaledScrollBarSize());
  
          Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal);
          scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track);
  
          Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal);
          if (thumb != null) {
              scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb);
          }
  
          boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack,
                  false);
          if (alwaysDraw) {
              scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true);
          }
  
          track = a.getDrawable(R.styleable.View_scrollbarTrackVertical);
          scrollabilityCache.scrollBar.setVerticalTrackDrawable(track);
  
          thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical);
          if (thumb != null) {
              scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb);
          }
  
          alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack,
                  false);
          if (alwaysDraw) {
              scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true);
          }
  
          // Apply layout direction to the new Drawables if needed
          final int layoutDirection = getLayoutDirection();
          if (track != null) {
              track.setLayoutDirection(layoutDirection);
          }
          if (thumb != null) {
              thumb.setLayoutDirection(layoutDirection);
          }
  
          // Re-apply user/background padding so that scrollbar(s) get added
          resolvePadding();
      }
  
      /**
       * Defines the vertical scrollbar thumb drawable
       * @attr ref android.R.styleable#View_scrollbarThumbVertical
       *
       * @see #awakenScrollBars(int)
       * @see #isVerticalScrollBarEnabled()
       * @see #setVerticalScrollBarEnabled(boolean)
       */
      public void setVerticalScrollbarThumbDrawable(@Nullable Drawable drawable) {
          initializeScrollBarDrawable();
          mScrollCache.scrollBar.setVerticalThumbDrawable(drawable);
      }
  
      /**
       * Defines the vertical scrollbar track drawable
       * @attr ref android.R.styleable#View_scrollbarTrackVertical
       *
       * @see #awakenScrollBars(int)
       * @see #isVerticalScrollBarEnabled()
       * @see #setVerticalScrollBarEnabled(boolean)
       */
      public void setVerticalScrollbarTrackDrawable(@Nullable Drawable drawable) {
          initializeScrollBarDrawable();
          mScrollCache.scrollBar.setVerticalTrackDrawable(drawable);
      }
  
      /**
       * Defines the horizontal thumb drawable
       * @attr ref android.R.styleable#View_scrollbarThumbHorizontal
       *
       * @see #awakenScrollBars(int)
       * @see #isHorizontalScrollBarEnabled()
       * @see #setHorizontalScrollBarEnabled(boolean)
       */
      public void setHorizontalScrollbarThumbDrawable(@Nullable Drawable drawable) {
          initializeScrollBarDrawable();
          mScrollCache.scrollBar.setHorizontalThumbDrawable(drawable);
      }
  
      /**
       * Defines the horizontal track drawable
       * @attr ref android.R.styleable#View_scrollbarTrackHorizontal
       *
       * @see #awakenScrollBars(int)
       * @see #isHorizontalScrollBarEnabled()
       * @see #setHorizontalScrollBarEnabled(boolean)
       */
      public void setHorizontalScrollbarTrackDrawable(@Nullable Drawable drawable) {
          initializeScrollBarDrawable();
          mScrollCache.scrollBar.setHorizontalTrackDrawable(drawable);
      }
  
      /**
       * Returns the currently configured Drawable for the thumb of the vertical scroll bar if it
       * exists, null otherwise.
       *
       * @see #awakenScrollBars(int)
       * @see #isVerticalScrollBarEnabled()
       * @see #setVerticalScrollBarEnabled(boolean)
       */
      public @Nullable Drawable getVerticalScrollbarThumbDrawable() {
          return mScrollCache != null ? mScrollCache.scrollBar.getVerticalThumbDrawable() : null;
      }
  
      /**
       * Returns the currently configured Drawable for the track of the vertical scroll bar if it
       * exists, null otherwise.
       *
       * @see #awakenScrollBars(int)
       * @see #isVerticalScrollBarEnabled()
       * @see #setVerticalScrollBarEnabled(boolean)
       */
      public @Nullable Drawable getVerticalScrollbarTrackDrawable() {
          return mScrollCache != null ? mScrollCache.scrollBar.getVerticalTrackDrawable() : null;
      }
  
      /**
       * Returns the currently configured Drawable for the thumb of the horizontal scroll bar if it
       * exists, null otherwise.
       *
       * @see #awakenScrollBars(int)
       * @see #isHorizontalScrollBarEnabled()
       * @see #setHorizontalScrollBarEnabled(boolean)
       */
      public @Nullable Drawable getHorizontalScrollbarThumbDrawable() {
          return mScrollCache != null ? mScrollCache.scrollBar.getHorizontalThumbDrawable() : null;
      }
  
      /**
       * Returns the currently configured Drawable for the track of the horizontal scroll bar if it
       * exists, null otherwise.
       *
       * @see #awakenScrollBars(int)
       * @see #isHorizontalScrollBarEnabled()
       * @see #setHorizontalScrollBarEnabled(boolean)
       */
      public @Nullable Drawable getHorizontalScrollbarTrackDrawable() {
          return mScrollCache != null ? mScrollCache.scrollBar.getHorizontalTrackDrawable() : null;
      }
  
      private void initializeScrollIndicatorsInternal() {
          // Some day maybe we'll break this into top/left/start/etc. and let the
          // client control it. Until then, you can have any scroll indicator you
          // want as long as it's a 1dp foreground-colored rectangle.
          if (mScrollIndicatorDrawable == null) {
              mScrollIndicatorDrawable = mContext.getDrawable(R.drawable.scroll_indicator_material);
          }
      }
  
      /**
       * <p>
       * Initalizes the scrollability cache if necessary.
       * </p>
       */
      private void initScrollCache() {
          if (mScrollCache == null) {
              mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this);
          }
      }
  
      @UnsupportedAppUsage
      private ScrollabilityCache getScrollCache() {
          initScrollCache();
          return mScrollCache;
      }
  
      /**
       * Set the position of the vertical scroll bar. Should be one of
       * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or
       * {@link #SCROLLBAR_POSITION_RIGHT}.
       *
       * @param position Where the vertical scroll bar should be positioned.
       */
      public void setVerticalScrollbarPosition(int position) {
          if (mVerticalScrollbarPosition != position) {
              mVerticalScrollbarPosition = position;
              computeOpaqueFlags();
              resolvePadding();
          }
      }
  
      /**
       * @return The position where the vertical scroll bar will show, if applicable.
       * @see #setVerticalScrollbarPosition(int)
       */
      public int getVerticalScrollbarPosition() {
          return mVerticalScrollbarPosition;
      }
  
      boolean isOnScrollbar(float x, float y) {
          if (mScrollCache == null) {
              return false;
          }
          x += getScrollX();
          y += getScrollY();
          final boolean canScrollVertically =
                  computeVerticalScrollRange() > computeVerticalScrollExtent();
          if (isVerticalScrollBarEnabled() && !isVerticalScrollBarHidden() && canScrollVertically) {
              final Rect touchBounds = mScrollCache.mScrollBarTouchBounds;
              getVerticalScrollBarBounds(null, touchBounds);
              if (touchBounds.contains((int) x, (int) y)) {
                  return true;
              }
          }
          final boolean canScrollHorizontally =
                  computeHorizontalScrollRange() > computeHorizontalScrollExtent();
          if (isHorizontalScrollBarEnabled() && canScrollHorizontally) {
              final Rect touchBounds = mScrollCache.mScrollBarTouchBounds;
              getHorizontalScrollBarBounds(null, touchBounds);
              if (touchBounds.contains((int) x, (int) y)) {
                  return true;
              }
          }
          return false;
      }
  
      @UnsupportedAppUsage
      boolean isOnScrollbarThumb(float x, float y) {
          return isOnVerticalScrollbarThumb(x, y) || isOnHorizontalScrollbarThumb(x, y);
      }
  
      private boolean isOnVerticalScrollbarThumb(float x, float y) {
          if (mScrollCache == null || !isVerticalScrollBarEnabled() || isVerticalScrollBarHidden()) {
              return false;
          }
          final int range = computeVerticalScrollRange();
          final int extent = computeVerticalScrollExtent();
          if (range > extent) {
              x += getScrollX();
              y += getScrollY();
              final Rect bounds = mScrollCache.mScrollBarBounds;
              final Rect touchBounds = mScrollCache.mScrollBarTouchBounds;
              getVerticalScrollBarBounds(bounds, touchBounds);
              final int offset = computeVerticalScrollOffset();
              final int thumbLength = ScrollBarUtils.getThumbLength(bounds.height(), bounds.width(),
                      extent, range);
              final int thumbOffset = ScrollBarUtils.getThumbOffset(bounds.height(), thumbLength,
                      extent, range, offset);
              final int thumbTop = bounds.top + thumbOffset;
              final int adjust = Math.max(mScrollCache.scrollBarMinTouchTarget - thumbLength, 0) / 2;
              if (x >= touchBounds.left && x <= touchBounds.right
                      && y >= thumbTop - adjust && y <= thumbTop + thumbLength + adjust) {
                  return true;
              }
          }
          return false;
      }
  
      private boolean isOnHorizontalScrollbarThumb(float x, float y) {
          if (mScrollCache == null || !isHorizontalScrollBarEnabled()) {
              return false;
          }
          final int range = computeHorizontalScrollRange();
          final int extent = computeHorizontalScrollExtent();
          if (range > extent) {
              x += getScrollX();
              y += getScrollY();
              final Rect bounds = mScrollCache.mScrollBarBounds;
              final Rect touchBounds = mScrollCache.mScrollBarTouchBounds;
              getHorizontalScrollBarBounds(bounds, touchBounds);
              final int offset = computeHorizontalScrollOffset();
  
              final int thumbLength = ScrollBarUtils.getThumbLength(bounds.width(), bounds.height(),
                      extent, range);
              final int thumbOffset = ScrollBarUtils.getThumbOffset(bounds.width(), thumbLength,
                      extent, range, offset);
              final int thumbLeft = bounds.left + thumbOffset;
              final int adjust = Math.max(mScrollCache.scrollBarMinTouchTarget - thumbLength, 0) / 2;
              if (x >= thumbLeft - adjust && x <= thumbLeft + thumbLength + adjust
                      && y >= touchBounds.top && y <= touchBounds.bottom) {
                  return true;
              }
          }
          return false;
      }
  
      @UnsupportedAppUsage
      boolean isDraggingScrollBar() {
          return mScrollCache != null
                  && mScrollCache.mScrollBarDraggingState != ScrollabilityCache.NOT_DRAGGING;
      }
  
      /**
       * Sets the state of all scroll indicators.
       * <p>
       * See {@link #setScrollIndicators(int, int)} for usage information.
       *
       * @param indicators a bitmask of indicators that should be enabled, or
       *                   {@code 0} to disable all indicators
       * @see #setScrollIndicators(int, int)
       * @see #getScrollIndicators()
       * @attr ref android.R.styleable#View_scrollIndicators
       */
      public void setScrollIndicators(@ScrollIndicators int indicators) {
          setScrollIndicators(indicators,
                  SCROLL_INDICATORS_PFLAG3_MASK >>> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT);
      }
  
      /**
       * Sets the state of the scroll indicators specified by the mask. To change
       * all scroll indicators at once, see {@link #setScrollIndicators(int)}.
       * <p>
       * When a scroll indicator is enabled, it will be displayed if the view
       * can scroll in the direction of the indicator.
       * <p>
       * Multiple indicator types may be enabled or disabled by passing the
       * logical OR of the desired types. If multiple types are specified, they
       * will all be set to the same enabled state.
       * <p>
       * For example, to enable the top scroll indicatorExample: {@code setScrollIndicators
       *
       * @param indicators the indicator direction, or the logical OR of multiple
       *             indicator directions. One or more of:
       *             <ul>
       *               <li>{@link #SCROLL_INDICATOR_TOP}</li>
       *               <li>{@link #SCROLL_INDICATOR_BOTTOM}</li>
       *               <li>{@link #SCROLL_INDICATOR_LEFT}</li>
       *               <li>{@link #SCROLL_INDICATOR_RIGHT}</li>
       *               <li>{@link #SCROLL_INDICATOR_START}</li>
       *               <li>{@link #SCROLL_INDICATOR_END}</li>
       *             </ul>
       * @see #setScrollIndicators(int)
       * @see #getScrollIndicators()
       * @attr ref android.R.styleable#View_scrollIndicators
       */
      public void setScrollIndicators(@ScrollIndicators int indicators, @ScrollIndicators int mask) {
          // Shift and sanitize mask.
          mask <<= SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
          mask &= SCROLL_INDICATORS_PFLAG3_MASK;
  
          // Shift and mask indicators.
          indicators <<= SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
          indicators &= mask;
  
          // Merge with non-masked flags.
          final int updatedFlags = indicators | (mPrivateFlags3 & ~mask);
  
          if (mPrivateFlags3 != updatedFlags) {
              mPrivateFlags3 = updatedFlags;
  
              if (indicators != 0) {
                  initializeScrollIndicatorsInternal();
              }
              invalidate();
          }
      }
  
      /**
       * Returns a bitmask representing the enabled scroll indicators.
       * <p>
       * For example, if the top and left scroll indicators are enabled and all
       * other indicators are disabled, the return value will be
       * {@code View.SCROLL_INDICATOR_TOP | View.SCROLL_INDICATOR_LEFT}.
       * <p>
       * To check whether the bottom scroll indicator is enabled, use the value
       * of {@code (getScrollIndicators() & View.SCROLL_INDICATOR_BOTTOM) != 0}.
       *
       * @return a bitmask representing the enabled scroll indicators
       */
      @InspectableProperty(flagMapping = {
              @FlagEntry(target = SCROLL_INDICATORS_NONE, mask = 0xffff_ffff, name = "none"),
              @FlagEntry(target = SCROLL_INDICATOR_TOP, name = "top"),
              @FlagEntry(target = SCROLL_INDICATOR_BOTTOM, name = "bottom"),
              @FlagEntry(target = SCROLL_INDICATOR_LEFT, name = "left"),
              @FlagEntry(target = SCROLL_INDICATOR_RIGHT, name = "right"),
              @FlagEntry(target = SCROLL_INDICATOR_START, name = "start"),
              @FlagEntry(target = SCROLL_INDICATOR_END, name = "end")
      })
      @ScrollIndicators
      public int getScrollIndicators() {
          return (mPrivateFlags3 & SCROLL_INDICATORS_PFLAG3_MASK)
                  >>> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
      }
  
      @UnsupportedAppUsage
      ListenerInfo getListenerInfo() {
          if (mListenerInfo != null) {
              return mListenerInfo;
          }
          mListenerInfo = new ListenerInfo();
          return mListenerInfo;
      }
  
      /**
       * Register a callback to be invoked when the scroll X or Y positions of
       * this view change.
       * <p>
       * <b>Note:</b> Some views handle scrolling independently from View and may
       * have their own separate listeners for scroll-type events. For example,
       * {@link android.widget.ListView ListView} allows clients to register an
       * {@link android.widget.ListView#setOnScrollListener(android.widget.AbsListView.OnScrollListener) AbsListView.OnScrollListener}
       * to listen for changes in list scroll position.
       *
       * @param l The listener to notify when the scroll X or Y position changes.
       * @see android.view.View#getScrollX()
       * @see android.view.View#getScrollY()
       */
      public void setOnScrollChangeListener(OnScrollChangeListener l) {
          getListenerInfo().mOnScrollChangeListener = l;
      }
  
      /**
       * Register a callback to be invoked when focus of this view changed.
       *
       * @param l The callback that will run.
       */
      public void setOnFocusChangeListener(OnFocusChangeListener l) {
          getListenerInfo().mOnFocusChangeListener = l;
      }
  
      /**
       * Add a listener that will be called when the bounds of the view change due to
       * layout processing.
       *
       * @param listener The listener that will be called when layout bounds change.
       */
      public void addOnLayoutChangeListener(OnLayoutChangeListener listener) {
          ListenerInfo li = getListenerInfo();
          if (li.mOnLayoutChangeListeners == null) {
              li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>();
          }
          if (!li.mOnLayoutChangeListeners.contains(listener)) {
              li.mOnLayoutChangeListeners.add(listener);
          }
      }
  
      /**
       * Remove a listener for layout changes.
       *
       * @param listener The listener for layout bounds change.
       */
      public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) {
          ListenerInfo li = mListenerInfo;
          if (li == null || li.mOnLayoutChangeListeners == null) {
              return;
          }
          li.mOnLayoutChangeListeners.remove(listener);
      }
  
      /**
       * Add a listener for attach state changes.
       *
       * This listener will be called whenever this view is attached or detached
       * from a window. Remove the listener using
       * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}.
       *
       * @param listener Listener to attach
       * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener)
       */
      public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) {
          ListenerInfo li = getListenerInfo();
          if (li.mOnAttachStateChangeListeners == null) {
              li.mOnAttachStateChangeListeners
                      = new CopyOnWriteArrayList<OnAttachStateChangeListener>();
          }
          li.mOnAttachStateChangeListeners.add(listener);
      }
  
      /**
       * Remove a listener for attach state changes. The listener will receive no further
       * notification of window attach/detach events.
       *
       * @param listener Listener to remove
       * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener)
       */
      public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) {
          ListenerInfo li = mListenerInfo;
          if (li == null || li.mOnAttachStateChangeListeners == null) {
              return;
          }
          li.mOnAttachStateChangeListeners.remove(listener);
      }
  
      /**
       * Returns the focus-change callback registered for this view.
       *
       * @return The callback, or null if one is not registered.
       */
      public OnFocusChangeListener getOnFocusChangeListener() {
          ListenerInfo li = mListenerInfo;
          return li != null ? li.mOnFocusChangeListener : null;
      }
  
      /**
       * Register a callback to be invoked when this view is clicked. If this view is not
       * clickable, it becomes clickable.
       *
       * @param l The callback that will run
       *
       * @see #setClickable(boolean)
       */
      public void setOnClickListener(@Nullable OnClickListener l) {
          if (!isClickable()) {
              setClickable(true);
          }
          getListenerInfo().mOnClickListener = l;
      }
  
      /**
       * Return whether this view has an attached OnClickListener.  Returns
       * true if there is a listener, false if there is none.
       */
      public boolean hasOnClickListeners() {
          ListenerInfo li = mListenerInfo;
          return (li != null && li.mOnClickListener != null);
      }
  
      /**
       * Register a callback to be invoked when this view is clicked and held. If this view is not
       * long clickable, it becomes long clickable.
       *
       * @param l The callback that will run
       *
       * @see #setLongClickable(boolean)
       */
      public void setOnLongClickListener(@Nullable OnLongClickListener l) {
          if (!isLongClickable()) {
              setLongClickable(true);
          }
          getListenerInfo().mOnLongClickListener = l;
      }
  
      /**
       * Register a callback to be invoked when this view is context clicked. If the view is not
       * context clickable, it becomes context clickable.
       *
       * @param l The callback that will run
       * @see #setContextClickable(boolean)
       */
      public void setOnContextClickListener(@Nullable OnContextClickListener l) {
          if (!isContextClickable()) {
              setContextClickable(true);
          }
          getListenerInfo().mOnContextClickListener = l;
      }
  
      /**
       * Register a callback to be invoked when the context menu for this view is
       * being built. If this view is not long clickable, it becomes long clickable.
       *
       * @param l The callback that will run
       *
       */
      public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) {
          if (!isLongClickable()) {
              setLongClickable(true);
          }
          getListenerInfo().mOnCreateContextMenuListener = l;
      }
  
      /**
       * Set an observer to collect stats for each frame rendered for this view.
       *
       * @hide
       */
      public void addFrameMetricsListener(Window window,
              Window.OnFrameMetricsAvailableListener listener,
              Handler handler) {
          if (mAttachInfo != null) {
              if (mAttachInfo.mThreadedRenderer != null) {
                  if (mFrameMetricsObservers == null) {
                      mFrameMetricsObservers = new ArrayList<>();
                  }
  
                  FrameMetricsObserver fmo = new FrameMetricsObserver(window,
                          handler.getLooper(), listener);
                  mFrameMetricsObservers.add(fmo);
                  mAttachInfo.mThreadedRenderer.addFrameMetricsObserver(fmo);
              } else {
                  Log.w(VIEW_LOG_TAG, "View not hardware-accelerated. Unable to observe frame stats");
              }
          } else {
              if (mFrameMetricsObservers == null) {
                  mFrameMetricsObservers = new ArrayList<>();
              }
  
              FrameMetricsObserver fmo = new FrameMetricsObserver(window,
                      handler.getLooper(), listener);
              mFrameMetricsObservers.add(fmo);
          }
      }
  
      /**
       * Remove observer configured to collect frame stats for this view.
       *
       * @hide
       */
      public void removeFrameMetricsListener(
              Window.OnFrameMetricsAvailableListener listener) {
          ThreadedRenderer renderer = getThreadedRenderer();
          FrameMetricsObserver fmo = findFrameMetricsObserver(listener);
          if (fmo == null) {
              throw new IllegalArgumentException(
                      "attempt to remove OnFrameMetricsAvailableListener that was never added");
          }
  
          if (mFrameMetricsObservers != null) {
              mFrameMetricsObservers.remove(fmo);
              if (renderer != null) {
                  renderer.removeFrameMetricsObserver(fmo);
              }
          }
      }
  
      private void registerPendingFrameMetricsObservers() {
          if (mFrameMetricsObservers != null) {
              ThreadedRenderer renderer = getThreadedRenderer();
              if (renderer != null) {
                  for (FrameMetricsObserver fmo : mFrameMetricsObservers) {
                      renderer.addFrameMetricsObserver(fmo);
                  }
              } else {
                  Log.w(VIEW_LOG_TAG, "View not hardware-accelerated. Unable to observe frame stats");
              }
          }
      }
  
      private FrameMetricsObserver findFrameMetricsObserver(
              Window.OnFrameMetricsAvailableListener listener) {
          if (mFrameMetricsObservers != null) {
              for (int i = 0; i < mFrameMetricsObservers.size(); i++) {
                  FrameMetricsObserver observer = mFrameMetricsObservers.get(i);
                  if (observer.mListener == listener) {
                      return observer;
                  }
              }
          }
  
          return null;
      }
  
      /** @hide */
      public void setNotifyAutofillManagerOnClick(boolean notify) {
          if (notify) {
              mPrivateFlags |= PFLAG_NOTIFY_AUTOFILL_MANAGER_ON_CLICK;
          } else {
              mPrivateFlags &= ~PFLAG_NOTIFY_AUTOFILL_MANAGER_ON_CLICK;
          }
      }
  
      private void notifyAutofillManagerOnClick() {
          if ((mPrivateFlags & PFLAG_NOTIFY_AUTOFILL_MANAGER_ON_CLICK) != 0) {
              try {
                  getAutofillManager().notifyViewClicked(this);
              } finally {
                  // Set it to already called so it's not called twice when called by
                  // performClickInternal()
                  mPrivateFlags &= ~PFLAG_NOTIFY_AUTOFILL_MANAGER_ON_CLICK;
              }
          }
      }
  
      /**
       * Entry point for {@link #performClick()} - other methods on View should call it instead of
       * {@code performClick()} directly to make sure the autofill manager is notified when
       * necessary (as subclasses could extend {@code performClick()} without calling the parent's
       * method).
       */
      private boolean performClickInternal() {
          // Must notify autofill manager before performing the click actions to avoid scenarios where
          // the app has a click listener that changes the state of views the autofill service might
          // be interested on.
          notifyAutofillManagerOnClick();
  
          return performClick();
      }
  
      /**
       * Call this view's OnClickListener, if it is defined.  Performs all normal
       * actions associated with clicking: reporting accessibility event, playing
       * a sound, etc.
       *
       * @return True there was an assigned OnClickListener that was called, false
       *         otherwise is returned.
       */
      // NOTE: other methods on View should not call this method directly, but performClickInternal()
      // instead, to guarantee that the autofill manager is notified when necessary (as subclasses
      // could extend this method without calling super.performClick()).
      public boolean performClick() {
          // We still need to call this method to handle the cases where performClick() was called
          // externally, instead of through performClickInternal()
          notifyAutofillManagerOnClick();
  
          final boolean result;
          final ListenerInfo li = mListenerInfo;
          if (li != null && li.mOnClickListener != null) {
              playSoundEffect(SoundEffectConstants.CLICK);
              li.mOnClickListener.onClick(this);
              result = true;
          } else {
              result = false;
          }
  
          sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
  
          notifyEnterOrExitForAutoFillIfNeeded(true);
  
          return result;
      }
  
      /**
       * Directly call any attached OnClickListener.  Unlike {@link #performClick()},
       * this only calls the listener, and does not do any associated clicking
       * actions like reporting an accessibility event.
       *
       * @return True there was an assigned OnClickListener that was called, false
       *         otherwise is returned.
       */
      public boolean callOnClick() {
          ListenerInfo li = mListenerInfo;
          if (li != null && li.mOnClickListener != null) {
              li.mOnClickListener.onClick(this);
              return true;
          }
          return false;
      }
  
      /**
       * Calls this view's OnLongClickListener, if it is defined. Invokes the
       * context menu if the OnLongClickListener did not consume the event.
       *
       * @return {@code true} if one of the above receivers consumed the event,
       *         {@code false} otherwise
       */
      public boolean performLongClick() {
          return performLongClickInternal(mLongClickX, mLongClickY);
      }
  
      /**
       * Calls this view's OnLongClickListener, if it is defined. Invokes the
       * context menu if the OnLongClickListener did not consume the event,
       * anchoring it to an (x,y) coordinate.
       *
       * @param x x coordinate of the anchoring touch event, or {@link Float#NaN}
       *          to disable anchoring
       * @param y y coordinate of the anchoring touch event, or {@link Float#NaN}
       *          to disable anchoring
       * @return {@code true} if one of the above receivers consumed the event,
       *         {@code false} otherwise
       */
      public boolean performLongClick(float x, float y) {
          mLongClickX = x;
          mLongClickY = y;
          final boolean handled = performLongClick();
          mLongClickX = Float.NaN;
          mLongClickY = Float.NaN;
          return handled;
      }
  
      /**
       * Calls this view's OnLongClickListener, if it is defined. Invokes the
       * context menu if the OnLongClickListener did not consume the event,
       * optionally anchoring it to an (x,y) coordinate.
       *
       * @param x x coordinate of the anchoring touch event, or {@link Float#NaN}
       *          to disable anchoring
       * @param y y coordinate of the anchoring touch event, or {@link Float#NaN}
       *          to disable anchoring
       * @return {@code true} if one of the above receivers consumed the event,
       *         {@code false} otherwise
       */
      private boolean performLongClickInternal(float x, float y) {
          sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
  
          boolean handled = false;
          final ListenerInfo li = mListenerInfo;
          if (li != null && li.mOnLongClickListener != null) {
              handled = li.mOnLongClickListener.onLongClick(View.this);
          }
          if (!handled) {
              final boolean isAnchored = !Float.isNaN(x) && !Float.isNaN(y);
              handled = isAnchored ? showContextMenu(x, y) : showContextMenu();
          }
          if ((mViewFlags & TOOLTIP) == TOOLTIP) {
              if (!handled) {
                  handled = showLongClickTooltip((int) x, (int) y);
              }
          }
          if (handled) {
              performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
          }
          return handled;
      }
  
      /**
       * Call this view's OnContextClickListener, if it is defined.
       *
       * @param x the x coordinate of the context click
       * @param y the y coordinate of the context click
       * @return True if there was an assigned OnContextClickListener that consumed the event, false
       *         otherwise.
       */
      public boolean performContextClick(float x, float y) {
          return performContextClick();
      }
  
      /**
       * Call this view's OnContextClickListener, if it is defined.
       *
       * @return True if there was an assigned OnContextClickListener that consumed the event, false
       *         otherwise.
       */
      public boolean performContextClick() {
          sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CONTEXT_CLICKED);
  
          boolean handled = false;
          ListenerInfo li = mListenerInfo;
          if (li != null && li.mOnContextClickListener != null) {
              handled = li.mOnContextClickListener.onContextClick(View.this);
          }
          if (handled) {
              performHapticFeedback(HapticFeedbackConstants.CONTEXT_CLICK);
          }
          return handled;
      }
  
      /**
       * Performs button-related actions during a touch down event.
       *
       * @param event The event.
       * @return True if the down was consumed.
       *
       * @hide
       */
      protected boolean performButtonActionOnTouchDown(MotionEvent event) {
          if (event.isFromSource(InputDevice.SOURCE_MOUSE) &&
              (event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) {
              showContextMenu(event.getX(), event.getY());
              mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT;
              return true;
          }
          return false;
      }
  
      /**
       * Shows the context menu for this view.
       *
       * @return {@code true} if the context menu was shown, {@code false}
       *         otherwise
       * @see #showContextMenu(float, float)
       */
      public boolean showContextMenu() {
          return getParent().showContextMenuForChild(this);
      }
  
      /**
       * Shows the context menu for this view anchored to the specified
       * view-relative coordinate.
       *
       * @param x the X coordinate in pixels relative to the view to which the
       *          menu should be anchored, or {@link Float#NaN} to disable anchoring
       * @param y the Y coordinate in pixels relative to the view to which the
       *          menu should be anchored, or {@link Float#NaN} to disable anchoring
       * @return {@code true} if the context menu was shown, {@code false}
       *         otherwise
       */
      public boolean showContextMenu(float x, float y) {
          return getParent().showContextMenuForChild(this, x, y);
      }
  
      /**
       * Start an action mode with the default type {@link ActionMode#TYPE_PRIMARY}.
       *
       * @param callback Callback that will control the lifecycle of the action mode
       * @return The new action mode if it is started, null otherwise
       *
       * @see ActionMode
       * @see #startActionMode(android.view.ActionMode.Callback, int)
       */
      public ActionMode startActionMode(ActionMode.Callback callback) {
          return startActionMode(callback, ActionMode.TYPE_PRIMARY);
      }
  
      /**
       * Start an action mode with the given type.
       *
       * @param callback Callback that will control the lifecycle of the action mode
       * @param type One of {@link ActionMode#TYPE_PRIMARY} or {@link ActionMode#TYPE_FLOATING}.
       * @return The new action mode if it is started, null otherwise
       *
       * @see ActionMode
       */
      public ActionMode startActionMode(ActionMode.Callback callback, int type) {
          ViewParent parent = getParent();
          if (parent == null) return null;
          try {
              return parent.startActionModeForChild(this, callback, type);
          } catch (AbstractMethodError ame) {
              // Older implementations of custom views might not implement this.
              return parent.startActionModeForChild(this, callback);
          }
      }
  
      /**
       * Call {@link Context#startActivityForResult(String, Intent, int, Bundle)} for the View's
       * Context, creating a unique View identifier to retrieve the result.
       *
       * @param intent The Intent to be started.
       * @param requestCode The request code to use.
       * @hide
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
      public void startActivityForResult(Intent intent, int requestCode) {
          mStartActivityRequestWho = "@android:view:" + System.identityHashCode(this);
          getContext().startActivityForResult(mStartActivityRequestWho, intent, requestCode, null);
      }
  
      /**
       * If this View corresponds to the calling who, dispatches the activity result.
       * @param who The identifier for the targeted View to receive the result.
       * @param requestCode The integer request code originally supplied to
       *                    startActivityForResult(), allowing you to identify who this
       *                    result came from.
       * @param resultCode The integer result code returned by the child activity
       *                   through its setResult().
       * @param data An Intent, which can return result data to the caller
       *               (various data can be attached to Intent "extras").
       * @return {@code true} if the activity result was dispatched.
       * @hide
       */
      public boolean dispatchActivityResult(
              String who, int requestCode, int resultCode, Intent data) {
          if (mStartActivityRequestWho != null && mStartActivityRequestWho.equals(who)) {
              onActivityResult(requestCode, resultCode, data);
              mStartActivityRequestWho = null;
              return true;
          }
          return false;
      }
  
      /**
       * Receive the result from a previous call to {@link #startActivityForResult(Intent, int)}.
       *
       * @param requestCode The integer request code originally supplied to
       *                    startActivityForResult(), allowing you to identify who this
       *                    result came from.
       * @param resultCode The integer result code returned by the child activity
       *                   through its setResult().
       * @param data An Intent, which can return result data to the caller
       *               (various data can be attached to Intent "extras").
       * @hide
       */
      public void onActivityResult(int requestCode, int resultCode, Intent data) {
          // Do nothing.
      }
  
      /**
       * Register a callback to be invoked when a hardware key is pressed in this view.
       * Key presses in software input methods will generally not trigger the methods of
       * this listener.
       * @param l the key listener to attach to this view
       */
      public void setOnKeyListener(OnKeyListener l) {
          getListenerInfo().mOnKeyListener = l;
      }
  
      /**
       * Register a callback to be invoked when a touch event is sent to this view.
       * @param l the touch listener to attach to this view
       */
      public void setOnTouchListener(OnTouchListener l) {
          getListenerInfo().mOnTouchListener = l;
      }
  
      /**
       * Register a callback to be invoked when a generic motion event is sent to this view.
       * @param l the generic motion listener to attach to this view
       */
      public void setOnGenericMotionListener(OnGenericMotionListener l) {
          getListenerInfo().mOnGenericMotionListener = l;
      }
  
      /**
       * Register a callback to be invoked when a hover event is sent to this view.
       * @param l the hover listener to attach to this view
       */
      public void setOnHoverListener(OnHoverListener l) {
          getListenerInfo().mOnHoverListener = l;
      }
  
      /**
       * Register a drag event listener callback object for this View. The parameter is
       * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a
       * View, the system calls the
       * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method.
       * @param l An implementation of {@link android.view.View.OnDragListener}.
       */
      public void setOnDragListener(OnDragListener l) {
          getListenerInfo().mOnDragListener = l;
      }
  
      /**
       * Give this view focus. This will cause
       * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called.
       *
       * Note: this does not check whether this {@link View} should get focus, it just
       * gives it focus no matter what.  It should only be called internally by framework
       * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}.
       *
       * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN},
       *        {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which
       *        focus moved when requestFocus() is called. It may not always
       *        apply, in which case use the default View.FOCUS_DOWN.
       * @param previouslyFocusedRect The rectangle of the view that had focus
       *        prior in this View's coordinate system.
       */
      void handleFocusGainInternal(@FocusRealDirection int direction, Rect previouslyFocusedRect) {
          if (DBG) {
              System.out.println(this + " requestFocus()");
          }
  
          if ((mPrivateFlags & PFLAG_FOCUSED) == 0) {
              mPrivateFlags |= PFLAG_FOCUSED;
  
              View oldFocus = (mAttachInfo != null) ? getRootView().findFocus() : null;
  
              if (mParent != null) {
                  mParent.requestChildFocus(this, this);
                  updateFocusedInCluster(oldFocus, direction);
              }
  
              if (mAttachInfo != null) {
                  mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, this);
              }
  
              onFocusChanged(true, direction, previouslyFocusedRect);
              refreshDrawableState();
          }
      }
  
      /**
       * Sets this view's preference for reveal behavior when it gains focus.
       *
       * <p>When set to true, this is a signal to ancestor views in the hierarchy that
       * this view would prefer to be brought fully into view when it gains focus.
       * For example, a text field that a user is meant to type into. Other views such
       * as scrolling containers may prefer to opt-out of this behavior.</p>
       *
       * <p>The default value for views is true, though subclasses may change this
       * based on their preferred behavior.</p>
       *
       * @param revealOnFocus true to request reveal on focus in ancestors, false otherwise
       *
       * @see #getRevealOnFocusHint()
       */
      public final void setRevealOnFocusHint(boolean revealOnFocus) {
          if (revealOnFocus) {
              mPrivateFlags3 &= ~PFLAG3_NO_REVEAL_ON_FOCUS;
          } else {
              mPrivateFlags3 |= PFLAG3_NO_REVEAL_ON_FOCUS;
          }
      }
  
      /**
       * Returns this view's preference for reveal behavior when it gains focus.
       *
       * <p>When this method returns true for a child view requesting focus, ancestor
       * views responding to a focus change in {@link ViewParent#requestChildFocus(View, View)}
       * should make a best effort to make the newly focused child fully visible to the user.
       * When it returns false, ancestor views should preferably not disrupt scroll positioning or
       * other properties affecting visibility to the user as part of the focus change.</p>
       *
       * @return true if this view would prefer to become fully visible when it gains focus,
       *         false if it would prefer not to disrupt scroll positioning
       *
       * @see #setRevealOnFocusHint(boolean)
       */
      public final boolean getRevealOnFocusHint() {
          return (mPrivateFlags3 & PFLAG3_NO_REVEAL_ON_FOCUS) == 0;
      }
  
      /**
       * Populates <code>outRect</code> with the hotspot bounds. By default,
       * the hotspot bounds are identical to the screen bounds.
       *
       * @param outRect rect to populate with hotspot bounds
       * @hide Only for internal use by views and widgets.
       */
      public void getHotspotBounds(Rect outRect) {
          final Drawable background = getBackground();
          if (background != null) {
              background.getHotspotBounds(outRect);
          } else {
              getBoundsOnScreen(outRect);
          }
      }
  
      /**
       * Request that a rectangle of this view be visible on the screen,
       * scrolling if necessary just enough.
       *
       * <p>A View should call this if it maintains some notion of which part
       * of its content is interesting.  For example, a text editing view
       * should call this when its cursor moves.
       * <p>The Rectangle passed into this method should be in the View's content coordinate space.
       * It should not be affected by which part of the View is currently visible or its scroll
       * position.
       *
       * @param rectangle The rectangle in the View's content coordinate space
       * @return Whether any parent scrolled.
       */
      public boolean requestRectangleOnScreen(Rect rectangle) {
          return requestRectangleOnScreen(rectangle, false);
      }
  
      /**
       * Request that a rectangle of this view be visible on the screen,
       * scrolling if necessary just enough.
       *
       * <p>A View should call this if it maintains some notion of which part
       * of its content is interesting.  For example, a text editing view
       * should call this when its cursor moves.
       * <p>The Rectangle passed into this method should be in the View's content coordinate space.
       * It should not be affected by which part of the View is currently visible or its scroll
       * position.
       * <p>When <code>immediate</code> is set to true, scrolling will not be
       * animated.
       *
       * @param rectangle The rectangle in the View's content coordinate space
       * @param immediate True to forbid animated scrolling, false otherwise
       * @return Whether any parent scrolled.
       */
      public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) {
          if (mParent == null) {
              return false;
          }
  
          View child = this;
  
          RectF position = (mAttachInfo != null) ? mAttachInfo.mTmpTransformRect : new RectF();
          position.set(rectangle);
  
          ViewParent parent = mParent;
          boolean scrolled = false;
          while (parent != null) {
              rectangle.set((int) position.left, (int) position.top,
                      (int) position.right, (int) position.bottom);
  
              scrolled |= parent.requestChildRectangleOnScreen(child, rectangle, immediate);
  
              if (!(parent instanceof View)) {
                  break;
              }
  
              // move it from child's content coordinate space to parent's content coordinate space
              position.offset(child.mLeft - child.getScrollX(), child.mTop -child.getScrollY());
  
              child = (View) parent;
              parent = child.getParent();
          }
  
          return scrolled;
      }
  
      /**
       * Called when this view wants to give up focus. If focus is cleared
       * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called.
       * <p>
       * <strong>Note:</strong> When not in touch-mode, the framework will try to give focus
       * to the first focusable View from the top after focus is cleared. Hence, if this
       * View is the first from the top that can take focus, then all callbacks
       * related to clearing focus will be invoked after which the framework will
       * give focus to this view.
       * </p>
       */
      public void clearFocus() {
          if (DBG) {
              System.out.println(this + " clearFocus()");
          }
  
          final boolean refocus = sAlwaysAssignFocus || !isInTouchMode();
          clearFocusInternal(null, true, refocus);
      }
  
      /**
       * Clears focus from the view, optionally propagating the change up through
       * the parent hierarchy and requesting that the root view place new focus.
       *
       * @param propagate whether to propagate the change up through the parent
       *            hierarchy
       * @param refocus when propagate is true, specifies whether to request the
       *            root view place new focus
       */
      void clearFocusInternal(View focused, boolean propagate, boolean refocus) {
          if ((mPrivateFlags & PFLAG_FOCUSED) != 0) {
              mPrivateFlags &= ~PFLAG_FOCUSED;
              clearParentsWantFocus();
  
              if (propagate && mParent != null) {
                  mParent.clearChildFocus(this);
              }
  
              onFocusChanged(false, 0, null);
              refreshDrawableState();
  
              if (propagate && (!refocus || !rootViewRequestFocus())) {
                  notifyGlobalFocusCleared(this);
              }
          }
      }
  
      void notifyGlobalFocusCleared(View oldFocus) {
          if (oldFocus != null && mAttachInfo != null) {
              mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, null);
          }
      }
  
      boolean rootViewRequestFocus() {
          final View root = getRootView();
          return root != null && root.requestFocus();
      }
  
      /**
       * Called internally by the view system when a new view is getting focus.
       * This is what clears the old focus.
       * <p>
       * <b>NOTE:</b> The parent view's focused child must be updated manually
       * after calling this method. Otherwise, the view hierarchy may be left in
       * an inconstent state.
       */
      void unFocus(View focused) {
          if (DBG) {
              System.out.println(this + " unFocus()");
          }
  
          clearFocusInternal(focused, false, false);
      }
  
      /**
       * Returns true if this view has focus itself, or is the ancestor of the
       * view that has focus.
       *
       * @return True if this view has or contains focus, false otherwise.
       */
      @ViewDebug.ExportedProperty(category = "focus")
      public boolean hasFocus() {
          return (mPrivateFlags & PFLAG_FOCUSED) != 0;
      }
  
      /**
       * Returns true if this view is focusable or if it contains a reachable View
       * for which {@link #hasFocusable()} returns {@code true}. A "reachable hasFocusable()"
       * is a view whose parents do not block descendants focus.
       * Only {@link #VISIBLE} views are considered focusable.
       *
       * <p>As of {@link Build.VERSION_CODES#O} views that are determined to be focusable
       * through {@link #FOCUSABLE_AUTO} will also cause this method to return {@code true}.
       * Apps that declare a {@link android.content.pm.ApplicationInfo#targetSdkVersion} of
       * earlier than {@link Build.VERSION_CODES#O} will continue to see this method return
       * {@code false} for views not explicitly marked as focusable.
       * Use {@link #hasExplicitFocusable()} if you require the pre-{@link Build.VERSION_CODES#O}
       * behavior.</p>
       *
       * @return {@code true} if the view is focusable or if the view contains a focusable
       *         view, {@code false} otherwise
       *
       * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS
       * @see ViewGroup#getTouchscreenBlocksFocus()
       * @see #hasExplicitFocusable()
       */
      public boolean hasFocusable() {
          return hasFocusable(!sHasFocusableExcludeAutoFocusable, false);
      }
  
      /**
       * Returns true if this view is focusable or if it contains a reachable View
       * for which {@link #hasExplicitFocusable()} returns {@code true}.
       * A "reachable hasExplicitFocusable()" is a view whose parents do not block descendants focus.
       * Only {@link #VISIBLE} views for which {@link #getFocusable()} would return
       * {@link #FOCUSABLE} are considered focusable.
       *
       * <p>This method preserves the pre-{@link Build.VERSION_CODES#O} behavior of
       * {@link #hasFocusable()} in that only views explicitly set focusable will cause
       * this method to return true. A view set to {@link #FOCUSABLE_AUTO} that resolves
       * to focusable will not.</p>
       *
       * @return {@code true} if the view is focusable or if the view contains a focusable
       *         view, {@code false} otherwise
       *
       * @see #hasFocusable()
       */
      public boolean hasExplicitFocusable() {
          return hasFocusable(false, true);
      }
  
      boolean hasFocusable(boolean allowAutoFocus, boolean dispatchExplicit) {
          if (!isFocusableInTouchMode()) {
              for (ViewParent p = mParent; p instanceof ViewGroup; p = p.getParent()) {
                  final ViewGroup g = (ViewGroup) p;
                  if (g.shouldBlockFocusForTouchscreen()) {
                      return false;
                  }
              }
          }
  
          // Invisible, gone, or disabled views are never focusable.
          if ((mViewFlags & VISIBILITY_MASK) != VISIBLE
                  || (mViewFlags & ENABLED_MASK) != ENABLED) {
              return false;
          }
  
          // Only use effective focusable value when allowed.
          if ((allowAutoFocus || getFocusable() != FOCUSABLE_AUTO) && isFocusable()) {
              return true;
          }
  
          return false;
      }
  
      /**
       * Called by the view system when the focus state of this view changes.
       * When the focus change event is caused by directional navigation, direction
       * and previouslyFocusedRect provide insight into where the focus is coming from.
       * When overriding, be sure to call up through to the super class so that
       * the standard focus handling will occur.
       *
       * @param gainFocus True if the View has focus; false otherwise.
       * @param direction The direction focus has moved when requestFocus()
       *                  is called to give this view focus. Values are
       *                  {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT},
       *                  {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}.
       *                  It may not always apply, in which case use the default.
       * @param previouslyFocusedRect The rectangle, in this view's coordinate
       *        system, of the previously focused view.  If applicable, this will be
       *        passed in as finer grained information about where the focus is coming
       *        from (in addition to direction).  Will be <code>null</code> otherwise.
       */
      @CallSuper
      protected void onFocusChanged(boolean gainFocus, @FocusDirection int direction,
              @Nullable Rect previouslyFocusedRect) {
          if (gainFocus) {
              sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED);
          } else {
              notifyViewAccessibilityStateChangedIfNeeded(
                      AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
          }
  
          // Here we check whether we still need the default focus highlight, and switch it on/off.
          switchDefaultFocusHighlight();
  
          if (!gainFocus) {
              if (isPressed()) {
                  setPressed(false);
              }
              if (mAttachInfo != null && mAttachInfo.mHasWindowFocus) {
                  notifyFocusChangeToInputMethodManager(false /* hasFocus */);
              }
              onFocusLost();
          } else if (mAttachInfo != null && mAttachInfo.mHasWindowFocus) {
              notifyFocusChangeToInputMethodManager(true /* hasFocus */);
          }
  
          invalidate(true);
          ListenerInfo li = mListenerInfo;
          if (li != null && li.mOnFocusChangeListener != null) {
              li.mOnFocusChangeListener.onFocusChange(this, gainFocus);
          }
  
          if (mAttachInfo != null) {
              mAttachInfo.mKeyDispatchState.reset(this);
          }
  
          notifyEnterOrExitForAutoFillIfNeeded(gainFocus);
      }
  
      /**
       * Notify {@link InputMethodManager} about the focus change of the {@link View}.
       *
       * <p>Does nothing when {@link InputMethodManager} is not available.</p>
       *
       * @param hasFocus {@code true} when the {@link View} is being focused.
       */
      private void notifyFocusChangeToInputMethodManager(boolean hasFocus) {
          final InputMethodManager imm =
                  getContext().getSystemService(InputMethodManager.class);
          if (imm == null) {
              return;
          }
          if (hasFocus) {
              imm.focusIn(this);
          } else {
              imm.focusOut(this);
          }
      }
  
      /** @hide */
      public void notifyEnterOrExitForAutoFillIfNeeded(boolean enter) {
          if (canNotifyAutofillEnterExitEvent()) {
              AutofillManager afm = getAutofillManager();
              if (afm != null) {
                  if (enter && isFocused()) {
                      // We have not been laid out yet, hence cannot evaluate
                      // whether this view is visible to the user, we will do
                      // the evaluation once layout is complete.
                      if (!isLaidOut()) {
                          mPrivateFlags3 |= PFLAG3_NOTIFY_AUTOFILL_ENTER_ON_LAYOUT;
                      } else if (isVisibleToUser()) {
                          // TODO This is a potential problem that View gets focus before it's visible
                          // to User. Ideally View should handle the event when isVisibleToUser()
                          // becomes true where it should issue notifyViewEntered().
                          afm.notifyViewEntered(this);
                      }
                  } else if (!enter && !isFocused()) {
                      afm.notifyViewExited(this);
                  }
              }
          }
      }
  
      /**
       * Visually distinct portion of a window with window-like semantics are considered panes for
       * accessibility purposes. One example is the content view of a fragment that is replaced.
       * In order for accessibility services to understand a pane's window-like behavior, panes
       * should have descriptive titles. Views with pane titles produce {@link AccessibilityEvent}s
       * when they appear, disappear, or change title.
       *
       * @param accessibilityPaneTitle The pane's title. Setting to {@code null} indicates that this
       *                               View is not a pane.
       *
       * {@see AccessibilityNodeInfo#setPaneTitle(CharSequence)}
       *
       * @attr ref android.R.styleable#View_accessibilityPaneTitle
       */
      public void setAccessibilityPaneTitle(@Nullable CharSequence accessibilityPaneTitle) {
          if (!TextUtils.equals(accessibilityPaneTitle, mAccessibilityPaneTitle)) {
              mAccessibilityPaneTitle = accessibilityPaneTitle;
              notifyViewAccessibilityStateChangedIfNeeded(
                      AccessibilityEvent.CONTENT_CHANGE_TYPE_PANE_TITLE);
          }
      }
  
      /**
       * Get the title of the pane for purposes of accessibility.
       *
       * @return The current pane title.
       *
       * {@see #setAccessibilityPaneTitle}.
       *
       * @attr ref android.R.styleable#View_accessibilityPaneTitle
       */
      @InspectableProperty
      @Nullable
      public CharSequence getAccessibilityPaneTitle() {
          return mAccessibilityPaneTitle;
      }
  
      private boolean isAccessibilityPane() {
          return mAccessibilityPaneTitle != null;
      }
  
      /**
       * Sends an accessibility event of the given type. If accessibility is
       * not enabled this method has no effect. The default implementation calls
       * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first
       * to populate information about the event source (this View), then calls
       * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to
       * populate the text content of the event source including its descendants,
       * and last calls
       * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)}
       * on its parent to request sending of the event to interested parties.
       * <p>
       * If an {@link AccessibilityDelegate} has been specified via calling
       * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
       * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is
       * responsible for handling this call.
       * </p>
       *
       * @param eventType The type of the event to send, as defined by several types from
       * {@link android.view.accessibility.AccessibilityEvent}, such as
       * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or
       * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}.
       *
       * @see #onInitializeAccessibilityEvent(AccessibilityEvent)
       * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent)
       * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)
       * @see AccessibilityDelegate
       */
      public void sendAccessibilityEvent(int eventType) {
          if (mAccessibilityDelegate != null) {
              mAccessibilityDelegate.sendAccessibilityEvent(this, eventType);
          } else {
              sendAccessibilityEventInternal(eventType);
          }
      }
  
      /**
       * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT}
       * {@link AccessibilityEvent} to suggest that an accessibility service announce the
       * specified text to its users.
       * <p>
       * Note: The event generated with this API carries no semantic meaning, and is appropriate only
       * in exceptional situations. Apps can generally achieve correct behavior for accessibility by
       * accurately supplying the semantics of their UI.
       * They should not need to specify what exactly is announced to users.
       *
       * @param text The announcement text.
       */
      public void announceForAccessibility(CharSequence text) {
          if (AccessibilityManager.getInstance(mContext).isEnabled() && mParent != null) {
              AccessibilityEvent event = AccessibilityEvent.obtain(
                      AccessibilityEvent.TYPE_ANNOUNCEMENT);
              onInitializeAccessibilityEvent(event);
              event.getText().add(text);
              event.setContentDescription(null);
              mParent.requestSendAccessibilityEvent(this, event);
          }
      }
  
      /**
       * @see #sendAccessibilityEvent(int)
       *
       * Note: Called from the default {@link AccessibilityDelegate}.
       *
       * @hide
       */
      public void sendAccessibilityEventInternal(int eventType) {
          if (AccessibilityManager.getInstance(mContext).isEnabled()) {
              sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType));
          }
      }
  
      /**
       * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but
       * takes as an argument an empty {@link AccessibilityEvent} and does not
       * perform a check whether accessibility is enabled.
       * <p>
       * If an {@link AccessibilityDelegate} has been specified via calling
       * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
       * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)}
       * is responsible for handling this call.
       * </p>
       *
       * @param event The event to send.
       *
       * @see #sendAccessibilityEvent(int)
       */
      public void sendAccessibilityEventUnchecked(AccessibilityEvent event) {
          if (mAccessibilityDelegate != null) {
              mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event);
          } else {
              sendAccessibilityEventUncheckedInternal(event);
          }
      }
  
      /**
       * @see #sendAccessibilityEventUnchecked(AccessibilityEvent)
       *
       * Note: Called from the default {@link AccessibilityDelegate}.
       *
       * @hide
       */
      public void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) {
          // Panes disappearing are relevant even if though the view is no longer visible.
          boolean isWindowStateChanged =
                  (event.getEventType() == AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
          boolean isWindowDisappearedEvent = isWindowStateChanged && ((event.getContentChangeTypes()
                  & AccessibilityEvent.CONTENT_CHANGE_TYPE_PANE_DISAPPEARED) != 0);
          if (!isShown() && !isWindowDisappearedEvent) {
              return;
          }
          onInitializeAccessibilityEvent(event);
          // Only a subset of accessibility events populates text content.
          if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) {
              dispatchPopulateAccessibilityEvent(event);
          }
          // In the beginning we called #isShown(), so we know that getParent() is not null.
          ViewParent parent = getParent();
          if (parent != null) {
              getParent().requestSendAccessibilityEvent(this, event);
          }
      }
  
      /**
       * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then
       * to its children for adding their text content to the event. Note that the
       * event text is populated in a separate dispatch path since we add to the
       * event not only the text of the source but also the text of all its descendants.
       * A typical implementation will call
       * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view
       * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)}
       * on each child. Override this method if custom population of the event text
       * content is required.
       * <p>
       * If an {@link AccessibilityDelegate} has been specified via calling
       * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
       * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)}
       * is responsible for handling this call.
       * </p>
       * <p>
       * <em>Note:</em> Accessibility events of certain types are not dispatched for
       * populating the event text via this method. For details refer to {@link AccessibilityEvent}.
       * </p>
       *
       * @param event The event.
       *
       * @return True if the event population was completed.
       */
      public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
          if (mAccessibilityDelegate != null) {
              return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event);
          } else {
              return dispatchPopulateAccessibilityEventInternal(event);
          }
      }
  
      /**
       * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent)
       *
       * Note: Called from the default {@link AccessibilityDelegate}.
       *
       * @hide
       */
      public boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) {
          onPopulateAccessibilityEvent(event);
          return false;
      }
  
      /**
       * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)}
       * giving a chance to this View to populate the accessibility event with its
       * text content. While this method is free to modify event
       * attributes other than text content, doing so should normally be performed in
       * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}.
       * <p>
       * Example: Adding formatted date string to an accessibility event in addition
       *          to the text added by the super implementation:
       * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) {
       *     super.onPopulateAccessibilityEvent(event);
       *     final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY;
       *     String selectedDateUtterance = DateUtils.formatDateTime(mContext,
       *         mCurrentDate.getTimeInMillis(), flags);
       *     event.getText().add(selectedDateUtterance);
       * }</pre>
       * <p>
       * If an {@link AccessibilityDelegate} has been specified via calling
       * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
       * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)}
       * is responsible for handling this call.
       * </p>
       * <p class="note"><strong>Note:</strong> Always call the super implementation before adding
       * information to the event, in case the default implementation has basic information to add.
       * </p>
       *
       * @param event The accessibility event which to populate.
       *
       * @see #sendAccessibilityEvent(int)
       * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent)
       */
      @CallSuper
      public void onPopulateAccessibilityEvent(AccessibilityEvent event) {
          if (mAccessibilityDelegate != null) {
              mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event);
          } else {
              onPopulateAccessibilityEventInternal(event);
          }
      }
  
      /**
       * @see #onPopulateAccessibilityEvent(AccessibilityEvent)
       *
       * Note: Called from the default {@link AccessibilityDelegate}.
       *
       * @hide
       */
      public void onPopulateAccessibilityEventInternal(AccessibilityEvent event) {
          if ((event.getEventType() == AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED)
                  && isAccessibilityPane()) {
              event.getText().add(getAccessibilityPaneTitle());
          }
      }
  
      /**
       * Initializes an {@link AccessibilityEvent} with information about
       * this View which is the event source. In other words, the source of
       * an accessibility event is the view whose state change triggered firing
       * the event.
       * <p>
       * Example: Setting the password property of an event in addition
       *          to properties set by the super implementation:
       * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
       *     super.onInitializeAccessibilityEvent(event);
       *     event.setPassword(true);
       * }</pre>
       * <p>
       * If an {@link AccessibilityDelegate} has been specified via calling
       * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
       * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)}
       * is responsible for handling this call.
       * </p>
       * <p class="note"><strong>Note:</strong> Always call the super implementation before adding
       * information to the event, in case the default implementation has basic information to add.
       * </p>
       * @param event The event to initialize.
       *
       * @see #sendAccessibilityEvent(int)
       * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent)
       */
      @CallSuper
      public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
          if (mAccessibilityDelegate != null) {
              mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event);
          } else {
              onInitializeAccessibilityEventInternal(event);
          }
      }
  
      /**
       * @see #onInitializeAccessibilityEvent(AccessibilityEvent)
       *
       * Note: Called from the default {@link AccessibilityDelegate}.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public void onInitializeAccessibilityEventInternal(AccessibilityEvent event) {
          event.setSource(this);
          event.setClassName(getAccessibilityClassName());
          event.setPackageName(getContext().getPackageName());
          event.setEnabled(isEnabled());
          event.setContentDescription(mContentDescription);
  
          switch (event.getEventType()) {
              case AccessibilityEvent.TYPE_VIEW_FOCUSED: {
                  ArrayList<View> focusablesTempList = (mAttachInfo != null)
                          ? mAttachInfo.mTempArrayList : new ArrayList<View>();
                  getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL);
                  event.setItemCount(focusablesTempList.size());
                  event.setCurrentItemIndex(focusablesTempList.indexOf(this));
                  if (mAttachInfo != null) {
                      focusablesTempList.clear();
                  }
              } break;
              case AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED: {
                  CharSequence text = getIterableTextForAccessibility();
                  if (text != null && text.length() > 0) {
                      event.setFromIndex(getAccessibilitySelectionStart());
                      event.setToIndex(getAccessibilitySelectionEnd());
                      event.setItemCount(text.length());
                  }
              } break;
          }
      }
  
      /**
       * Returns an {@link AccessibilityNodeInfo} representing this view from the
       * point of view of an {@link android.accessibilityservice.AccessibilityService}.
       * This method is responsible for obtaining an accessibility node info from a
       * pool of reusable instances and calling
       * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to
       * initialize the former.
       * <p>
       * Note: The client is responsible for recycling the obtained instance by calling
       *       {@link AccessibilityNodeInfo#recycle()} to minimize object creation.
       * </p>
       *
       * @return A populated {@link AccessibilityNodeInfo}.
       *
       * @see AccessibilityNodeInfo
       */
      public AccessibilityNodeInfo createAccessibilityNodeInfo() {
          if (mAccessibilityDelegate != null) {
              return mAccessibilityDelegate.createAccessibilityNodeInfo(this);
          } else {
              return createAccessibilityNodeInfoInternal();
          }
      }
  
      /**
       * @see #createAccessibilityNodeInfo()
       *
       * @hide
       */
      public AccessibilityNodeInfo createAccessibilityNodeInfoInternal() {
          AccessibilityNodeProvider provider = getAccessibilityNodeProvider();
          if (provider != null) {
              return provider.createAccessibilityNodeInfo(AccessibilityNodeProvider.HOST_VIEW_ID);
          } else {
              AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this);
              onInitializeAccessibilityNodeInfo(info);
              return info;
          }
      }
  
      /**
       * Initializes an {@link AccessibilityNodeInfo} with information about this view.
       * The base implementation sets:
       * <ul>
       *   <li>{@link AccessibilityNodeInfo#setParent(View)},</li>
       *   <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li>
       *   <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li>
       *   <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li>
       *   <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li>
       *   <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li>
       *   <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li>
       *   <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li>
       *   <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li>
       *   <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li>
       *   <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li>
       *   <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li>
       *   <li>{@link AccessibilityNodeInfo#setContextClickable(boolean)}</li>
       * </ul>
       * <p>
       * Subclasses should override this method, call the super implementation,
       * and set additional attributes.
       * </p>
       * <p>
       * If an {@link AccessibilityDelegate} has been specified via calling
       * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
       * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)}
       * is responsible for handling this call.
       * </p>
       *
       * @param info The instance to initialize.
       */
      @CallSuper
      public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
          if (mAccessibilityDelegate != null) {
              mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info);
          } else {
              onInitializeAccessibilityNodeInfoInternal(info);
          }
      }
  
      /**
       * Gets the location of this view in screen coordinates.
       *
       * @param outRect The output location
       * @hide
       */
      @UnsupportedAppUsage
      public void getBoundsOnScreen(Rect outRect) {
          getBoundsOnScreen(outRect, false);
      }
  
      /**
       * Gets the location of this view in screen coordinates.
       *
       * @param outRect The output location
       * @param clipToParent Whether to clip child bounds to the parent ones.
       * @hide
       */
      @UnsupportedAppUsage
      public void getBoundsOnScreen(Rect outRect, boolean clipToParent) {
          if (mAttachInfo == null) {
              return;
          }
  
          RectF position = mAttachInfo.mTmpTransformRect;
          position.set(0, 0, mRight - mLeft, mBottom - mTop);
          mapRectFromViewToScreenCoords(position, clipToParent);
          outRect.set(Math.round(position.left), Math.round(position.top),
                  Math.round(position.right), Math.round(position.bottom));
      }
  
      /**
       * Map a rectangle from view-relative coordinates to screen-relative coordinates
       *
       * @param rect The rectangle to be mapped
       * @param clipToParent Whether to clip child bounds to the parent ones.
       * @hide
       */
      public void mapRectFromViewToScreenCoords(RectF rect, boolean clipToParent) {
          if (!hasIdentityMatrix()) {
              getMatrix().mapRect(rect);
          }
  
          rect.offset(mLeft, mTop);
  
          ViewParent parent = mParent;
          while (parent instanceof View) {
              View parentView = (View) parent;
  
              rect.offset(-parentView.mScrollX, -parentView.mScrollY);
  
              if (clipToParent) {
                  rect.left = Math.max(rect.left, 0);
                  rect.top = Math.max(rect.top, 0);
                  rect.right = Math.min(rect.right, parentView.getWidth());
                  rect.bottom = Math.min(rect.bottom, parentView.getHeight());
              }
  
              if (!parentView.hasIdentityMatrix()) {
                  parentView.getMatrix().mapRect(rect);
              }
  
              rect.offset(parentView.mLeft, parentView.mTop);
  
              parent = parentView.mParent;
          }
  
          if (parent instanceof ViewRootImpl) {
              ViewRootImpl viewRootImpl = (ViewRootImpl) parent;
              rect.offset(0, -viewRootImpl.mCurScrollY);
          }
  
          rect.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop);
      }
  
      /**
       * Return the class name of this object to be used for accessibility purposes.
       * Subclasses should only override this if they are implementing something that
       * should be seen as a completely new class of view when used by accessibility,
       * unrelated to the class it is deriving from.  This is used to fill in
       * {@link AccessibilityNodeInfo#setClassName AccessibilityNodeInfo.setClassName}.
       */
      public CharSequence getAccessibilityClassName() {
          return View.class.getName();
      }
  
      /**
       * Called when assist structure is being retrieved from a view as part of
       * {@link android.app.Activity#onProvideAssistData Activity.onProvideAssistData}.
       * @param structure Fill in with structured view data.  The default implementation
       * fills in all data that can be inferred from the view itself.
       */
      public void onProvideStructure(ViewStructure structure) {
          onProvideStructure(structure, VIEW_STRUCTURE_FOR_ASSIST, /* flags= */ 0);
      }
  
      /**
       * Populates a {@link ViewStructure} to fullfil an autofill request.
       *
       * <p>The structure should contain at least the following properties:
       * <ul>
       *   <li>Autofill id ({@link ViewStructure#setAutofillId(AutofillId, int)}).
       *   <li>Autofill type ({@link ViewStructure#setAutofillType(int)}).
       *   <li>Autofill value ({@link ViewStructure#setAutofillValue(AutofillValue)}).
       *   <li>Whether the data is sensitive ({@link ViewStructure#setDataIsSensitive(boolean)}).
       * </ul>
       *
       * <p>It's also recommended to set the following properties - the more properties the structure
       * has, the higher the changes of an {@link android.service.autofill.AutofillService} properly
       * using the structure:
       *
       * <ul>
       *   <li>Autofill hints ({@link ViewStructure#setAutofillHints(String[])}).
       *   <li>Autofill options ({@link ViewStructure#setAutofillOptions(CharSequence[])}) when the
       *       view can only be filled with predefined values (typically used when the autofill type
       *       is {@link #AUTOFILL_TYPE_LIST}).
       *   <li>Resource id ({@link ViewStructure#setId(int, String, String, String)}).
       *   <li>Class name ({@link ViewStructure#setClassName(String)}).
       *   <li>Content description ({@link ViewStructure#setContentDescription(CharSequence)}).
       *   <li>Visual properties such as visibility ({@link ViewStructure#setVisibility(int)}),
       *       dimensions ({@link ViewStructure#setDimens(int, int, int, int, int, int)}), and
       *       opacity ({@link ViewStructure#setOpaque(boolean)}).
       *   <li>For views representing text fields, text properties such as the text itself
       *       ({@link ViewStructure#setText(CharSequence)}), text hints
       *       ({@link ViewStructure#setHint(CharSequence)}, input type
       *       ({@link ViewStructure#setInputType(int)}),
       *   <li>For views representing HTML nodes, its web domain
       *       ({@link ViewStructure#setWebDomain(String)}) and HTML properties
       *       (({@link ViewStructure#setHtmlInfo(android.view.ViewStructure.HtmlInfo)}).
       * </ul>
       *
       * <p>The default implementation of this method already sets most of these properties based on
       * related {@link View} methods (for example, the autofill id is set using
       * {@link #getAutofillId()}, the autofill type set using {@link #getAutofillType()}, etc.),
       * and views in the standard Android widgets library also override it to set their
       * relevant properties (for example, {@link android.widget.TextView} already sets the text
       * properties), so it's recommended to only override this method
       * (and call {@code super.onProvideAutofillStructure()}) when:
       *
       * <ul>
       *   <li>The view contents does not include PII (Personally Identifiable Information), so it
       *       can call {@link ViewStructure#setDataIsSensitive(boolean)} passing {@code false}.
       *   <li>The view can only be autofilled with predefined options, so it can call
       *       {@link ViewStructure#setAutofillOptions(CharSequence[])}.
       * </ul>
       *
       * <p><b>Note:</b> The {@code left} and {@code top} values set in
       * {@link ViewStructure#setDimens(int, int, int, int, int, int)} must be relative to the next
       * {@link ViewGroup#isImportantForAutofill()} predecessor view included in the structure.
       *
       * <p>Views support the Autofill Framework mainly by:
       * <ul>
       *   <li>Providing the metadata defining what the view means and how it can be autofilled.
       *   <li>Notifying the Android System when the view value changed by calling
       *       {@link AutofillManager#notifyValueChanged(View)}.
       *   <li>Implementing the methods that autofill the view.
       * </ul>
       * <p>This method is responsible for the former; {@link #autofill(AutofillValue)} is responsible
       * for the latter.
       *
       * @param structure fill in with structured view data for autofill purposes.
       * @param flags optional flags.
       *
       * @see #AUTOFILL_FLAG_INCLUDE_NOT_IMPORTANT_VIEWS
       */
      public void onProvideAutofillStructure(ViewStructure structure, @AutofillFlags int flags) {
          onProvideStructure(structure, VIEW_STRUCTURE_FOR_AUTOFILL, flags);
      }
  
      /**
       * Populates a {@link ViewStructure} for content capture.
       *
       * <p>This method is called after a view is that is eligible for content capture
       * (for example, if it {@link #isImportantForAutofill()}, an intelligence service is enabled for
       * the user, and the activity rendering the view is enabled for content capture) is laid out and
       * is visible.
       *
       * <p>The populated structure is then passed to the service through
       * {@link ContentCaptureSession#notifyViewAppeared(ViewStructure)}.
       *
       * <p><b>Note: </b>views that manage a virtual structure under this view must populate just
       * the node representing this view and return right away, then asynchronously report (not
       * necessarily in the UI thread) when the children nodes appear, disappear or have their text
       * changed by calling
       * {@link ContentCaptureSession#notifyViewAppeared(ViewStructure)},
       * {@link ContentCaptureSession#notifyViewDisappeared(AutofillId)}, and
       * {@link ContentCaptureSession#notifyViewTextChanged(AutofillId, CharSequence)}
       * respectively. The structure for the a child must be created using
       * {@link ContentCaptureSession#newVirtualViewStructure(AutofillId, long)}, and the
       * {@code autofillId} for a child can be obtained either through
       * {@code childStructure.getAutofillId()} or
       * {@link ContentCaptureSession#newAutofillId(AutofillId, long)}.
       *
       * <p>When the virtual view hierarchy represents a web page, you should also:
       *
       * <ul>
       *   <li>Call {@link ContentCaptureManager#getContentCaptureConditions()} to infer content
       *   capture events should be generate for that URL.
       *   <li>Create a new {@link ContentCaptureSession} child for every HTML element that
       *   renders a new URL (like an {@code IFRAME}) and use that session to notify events from
       *   that subtree.
       * </ul>
       *
       * <p><b>Note: </b>the following methods of the {@code structure} will be ignored:
       * <ul>
       *   <li>{@link ViewStructure#setChildCount(int)}
       *   <li>{@link ViewStructure#addChildCount(int)}
       *   <li>{@link ViewStructure#getChildCount()}
       *   <li>{@link ViewStructure#newChild(int)}
       *   <li>{@link ViewStructure#asyncNewChild(int)}
       *   <li>{@link ViewStructure#asyncCommit()}
       *   <li>{@link ViewStructure#setWebDomain(String)}
       *   <li>{@link ViewStructure#newHtmlInfoBuilder(String)}
       *   <li>{@link ViewStructure#setHtmlInfo(android.view.ViewStructure.HtmlInfo)}
       *   <li>{@link ViewStructure#setDataIsSensitive(boolean)}
       *   <li>{@link ViewStructure#setAlpha(float)}
       *   <li>{@link ViewStructure#setElevation(float)}
       *   <li>{@link ViewStructure#setTransformation(Matrix)}
       *
       * </ul>
       *
       * @hide
       */
      @TestApi
      public void onProvideContentCaptureStructure(@NonNull ViewStructure structure, int flags) {
          onProvideStructure(structure, VIEW_STRUCTURE_FOR_CONTENT_CAPTURE, flags);
      }
  
      /** @hide */
      protected void onProvideStructure(@NonNull ViewStructure structure,
              @ViewStructureType int viewFor, int flags) {
          final int id = mID;
          if (id != NO_ID && !isViewIdGenerated(id)) {
              String pkg, type, entry;
              try {
                  final Resources res = getResources();
                  entry = res.getResourceEntryName(id);
                  type = res.getResourceTypeName(id);
                  pkg = res.getResourcePackageName(id);
              } catch (Resources.NotFoundException e) {
                  entry = type = pkg = null;
              }
              structure.setId(id, pkg, type, entry);
          } else {
              structure.setId(id, null, null, null);
          }
  
          if (viewFor == VIEW_STRUCTURE_FOR_AUTOFILL
                  || viewFor == VIEW_STRUCTURE_FOR_CONTENT_CAPTURE) {
              final @AutofillType int autofillType = getAutofillType();
              // Don't need to fill autofill info if view does not support it.
              // For example, only TextViews that are editable support autofill
              if (autofillType != AUTOFILL_TYPE_NONE) {
                  structure.setAutofillType(autofillType);
                  structure.setAutofillHints(getAutofillHints());
                  structure.setAutofillValue(getAutofillValue());
              }
              structure.setImportantForAutofill(getImportantForAutofill());
          }
  
          int ignoredParentLeft = 0;
          int ignoredParentTop = 0;
          if (viewFor == VIEW_STRUCTURE_FOR_AUTOFILL
                  && (flags & AUTOFILL_FLAG_INCLUDE_NOT_IMPORTANT_VIEWS) == 0) {
              View parentGroup = null;
  
              ViewParent viewParent = getParent();
              if (viewParent instanceof View) {
                  parentGroup = (View) viewParent;
              }
  
              while (parentGroup != null && !parentGroup.isImportantForAutofill()) {
                  ignoredParentLeft += parentGroup.mLeft;
                  ignoredParentTop += parentGroup.mTop;
  
                  viewParent = parentGroup.getParent();
                  if (viewParent instanceof View) {
                      parentGroup = (View) viewParent;
                  } else {
                      break;
                  }
              }
          }
  
          structure.setDimens(ignoredParentLeft + mLeft, ignoredParentTop + mTop, mScrollX, mScrollY,
                  mRight - mLeft, mBottom - mTop);
          if (viewFor == VIEW_STRUCTURE_FOR_ASSIST) {
              if (!hasIdentityMatrix()) {
                  structure.setTransformation(getMatrix());
              }
              structure.setElevation(getZ());
          }
          structure.setVisibility(getVisibility());
          structure.setEnabled(isEnabled());
          if (isClickable()) {
              structure.setClickable(true);
          }
          if (isFocusable()) {
              structure.setFocusable(true);
          }
          if (isFocused()) {
              structure.setFocused(true);
          }
          if (isAccessibilityFocused()) {
              structure.setAccessibilityFocused(true);
          }
          if (isSelected()) {
              structure.setSelected(true);
          }
          if (isActivated()) {
              structure.setActivated(true);
          }
          if (isLongClickable()) {
              structure.setLongClickable(true);
          }
          if (this instanceof Checkable) {
              structure.setCheckable(true);
              if (((Checkable)this).isChecked()) {
                  structure.setChecked(true);
              }
          }
          if (isOpaque()) {
              structure.setOpaque(true);
          }
          if (isContextClickable()) {
              structure.setContextClickable(true);
          }
          structure.setClassName(getAccessibilityClassName().toString());
          structure.setContentDescription(getContentDescription());
      }
  
      /**
       * Called when assist structure is being retrieved from a view as part of
       * {@link android.app.Activity#onProvideAssistData Activity.onProvideAssistData} to
       * generate additional virtual structure under this view.  The defaullt implementation
       * uses {@link #getAccessibilityNodeProvider()} to try to generate this from the
       * view's virtual accessibility nodes, if any.  You can override this for a more
       * optimal implementation providing this data.
       */
      public void onProvideVirtualStructure(ViewStructure structure) {
          onProvideVirtualStructureCompat(structure, false);
      }
  
      /**
       * Fallback implementation to populate a ViewStructure from accessibility state.
       *
       * @param structure The structure to populate.
       * @param forAutofill Whether the structure is needed for autofill.
       */
      private void onProvideVirtualStructureCompat(ViewStructure structure, boolean forAutofill) {
          final AccessibilityNodeProvider provider = getAccessibilityNodeProvider();
          if (provider != null) {
              if (forAutofill && Log.isLoggable(AUTOFILL_LOG_TAG, Log.VERBOSE)) {
                  Log.v(AUTOFILL_LOG_TAG, "onProvideVirtualStructureCompat() for " + this);
              }
              final AccessibilityNodeInfo info = createAccessibilityNodeInfo();
              structure.setChildCount(1);
              final ViewStructure root = structure.newChild(0);
              populateVirtualStructure(root, provider, info, forAutofill);
              info.recycle();
          }
      }
  
      /**
       * Populates a {@link ViewStructure} containing virtual children to fullfil an autofill
       * request.
       *
       * <p>This method should be used when the view manages a virtual structure under this view. For
       * example, a view that draws input fields using {@link #draw(Canvas)}.
       *
       * <p>When implementing this method, subclasses must follow the rules below:
       *
       * <ul>
       *   <li>Add virtual children by calling the {@link ViewStructure#newChild(int)} or
       *       {@link ViewStructure#asyncNewChild(int)} methods, where the {@code id} is an unique id
       *       identifying the children in the virtual structure.
       *   <li>The children hierarchy can have multiple levels if necessary, but ideally it should
       *       exclude intermediate levels that are irrelevant for autofill; that would improve the
       *       autofill performance.
       *   <li>Also implement {@link #autofill(SparseArray)} to autofill the virtual
       *       children.
       *   <li>Set the autofill properties of the child structure as defined by
       *       {@link #onProvideAutofillStructure(ViewStructure, int)}, using
       *       {@link ViewStructure#setAutofillId(AutofillId, int)} to set its autofill id.
       *   <li>Call {@link android.view.autofill.AutofillManager#notifyViewEntered(View, int, Rect)}
       *       and/or {@link android.view.autofill.AutofillManager#notifyViewExited(View, int)}
       *       when the focused virtual child changed.
       *   <li>Override {@link #isVisibleToUserForAutofill(int)} to allow the platform to query
       *       whether a given virtual view is visible to the user in order to support triggering
       *       save when all views of interest go away.
       *   <li>Call
       *    {@link android.view.autofill.AutofillManager#notifyValueChanged(View, int, AutofillValue)}
       *       when the value of a virtual child changed.
       *   <li>Call {@link
       *    android.view.autofill.AutofillManager#notifyViewVisibilityChanged(View, int, boolean)}
       *       when the visibility of a virtual child changed.
       *   <li>Call
       *    {@link android.view.autofill.AutofillManager#notifyViewClicked(View, int)} when a virtual
       *       child is clicked.
       *   <li>Call {@link AutofillManager#commit()} when the autofill context of the view structure
       *       changed and the current context should be committed (for example, when the user tapped
       *       a {@code SUBMIT} button in an HTML page).
       *   <li>Call {@link AutofillManager#cancel()} when the autofill context of the view structure
       *       changed and the current context should be canceled (for example, when the user tapped
       *       a {@code CANCEL} button in an HTML page).
       *   <li>Provide ways for users to manually request autofill by calling
       *       {@link AutofillManager#requestAutofill(View, int, Rect)}.
       *   <li>The {@code left} and {@code top} values set in
       *       {@link ViewStructure#setDimens(int, int, int, int, int, int)} must be relative to the
       *       next {@link ViewGroup#isImportantForAutofill()} predecessor view included in the
       *       structure.
       * </ul>
       *
       * <p>Views with virtual children support the Autofill Framework mainly by:
       * <ul>
       *   <li>Providing the metadata defining what the virtual children mean and how they can be
       *       autofilled.
       *   <li>Implementing the methods that autofill the virtual children.
       * </ul>
       * <p>This method is responsible for the former; {@link #autofill(SparseArray)} is responsible
       * for the latter.
       *
       * @param structure fill in with virtual children data for autofill purposes.
       * @param flags optional flags.
       *
       * @see #AUTOFILL_FLAG_INCLUDE_NOT_IMPORTANT_VIEWS
       */
      public void onProvideAutofillVirtualStructure(ViewStructure structure, int flags) {
          if (mContext.isAutofillCompatibilityEnabled()) {
              onProvideVirtualStructureCompat(structure, true);
          }
      }
  
      /**
       * Automatically fills the content of this view with the {@code value}.
       *
       * <p>Views support the Autofill Framework mainly by:
       * <ul>
       *   <li>Providing the metadata defining what the view means and how it can be autofilled.
       *   <li>Implementing the methods that autofill the view.
       * </ul>
       * <p>{@link #onProvideAutofillStructure(ViewStructure, int)} is responsible for the former,
       * this method is responsible for latter.
       *
       * <p>This method does nothing by default, but when overridden it typically:
       * <ol>
       *   <li>Checks if the provided value matches the expected type (which is defined by
       *       {@link #getAutofillType()}).
       *   <li>Checks if the view is editable - if it isn't, it should return right away.
       *   <li>Call the proper getter method on {@link AutofillValue} to fetch the actual value.
       *   <li>Pass the actual value to the equivalent setter in the view.
       * </ol>
       *
       * <p>For example, a text-field view could implement the method this way:
       *
       * <pre class="prettyprint">
       * &#64;Override
       * public void autofill(AutofillValue value) {
       *   if (!value.isText() || !this.isEditable()) {
       *      return;
       *   }
       *   CharSequence text = value.getTextValue();
       *   if (text != null) {
       *     this.setText(text);
       *   }
       * }
       * </pre>
       *
       * <p>If the value is updated asynchronously, the next call to
       * {@link AutofillManager#notifyValueChanged(View)} must happen <b>after</b> the value was
       * changed to the autofilled value. If not, the view will not be considered autofilled.
       *
       * <p><b>Note:</b> After this method is called, the value returned by
       * {@link #getAutofillValue()} must be equal to the {@code value} passed to it, otherwise the
       * view will not be highlighted as autofilled.
       *
       * @param value value to be autofilled.
       */
      public void autofill(@SuppressWarnings("unused") AutofillValue value) {
      }
  
      /**
       * Automatically fills the content of the virtual children within this view.
       *
       * <p>Views with virtual children support the Autofill Framework mainly by:
       * <ul>
       *   <li>Providing the metadata defining what the virtual children mean and how they can be
       *       autofilled.
       *   <li>Implementing the methods that autofill the virtual children.
       * </ul>
       * <p>{@link #onProvideAutofillVirtualStructure(ViewStructure, int)} is responsible for the
       * former, this method is responsible for the latter - see {@link #autofill(AutofillValue)} and
       * {@link #onProvideAutofillVirtualStructure(ViewStructure, int)} for more info about autofill.
       *
       * <p>If a child value is updated asynchronously, the next call to
       * {@link AutofillManager#notifyValueChanged(View, int, AutofillValue)} must happen
       * <b>after</b> the value was changed to the autofilled value. If not, the child will not be
       * considered autofilled.
       *
       * <p><b>Note:</b> To indicate that a virtual view was autofilled,
       * <code>?android:attr/autofilledHighlight</code> should be drawn over it until the data
       * changes.
       *
       * @param values map of values to be autofilled, keyed by virtual child id.
       *
       * @attr ref android.R.styleable#Theme_autofilledHighlight
       */
      public void autofill(@NonNull @SuppressWarnings("unused") SparseArray<AutofillValue> values) {
          if (!mContext.isAutofillCompatibilityEnabled()) {
              return;
          }
          final AccessibilityNodeProvider provider = getAccessibilityNodeProvider();
          if (provider == null) {
              return;
          }
          final int valueCount = values.size();
          for (int i = 0; i < valueCount; i++) {
              final AutofillValue value = values.valueAt(i);
              if (value.isText()) {
                  final int virtualId = values.keyAt(i);
                  final CharSequence text = value.getTextValue();
                  final Bundle arguments = new Bundle();
                  arguments.putCharSequence(
                          AccessibilityNodeInfo.ACTION_ARGUMENT_SET_TEXT_CHARSEQUENCE, text);
                  provider.performAction(virtualId, AccessibilityNodeInfo.ACTION_SET_TEXT, arguments);
              }
          }
      }
  
      /**
       * Gets the unique, logical identifier of this view in the activity, for autofill purposes.
       *
       * <p>The autofill id is created on demand, unless it is explicitly set by
       * {@link #setAutofillId(AutofillId)}.
       *
       * <p>See {@link #setAutofillId(AutofillId)} for more info.
       *
       * @return The View's autofill id.
       */
      public final AutofillId getAutofillId() {
          if (mAutofillId == null) {
              // The autofill id needs to be unique, but its value doesn't matter,
              // so it's better to reuse the accessibility id to save space.
              mAutofillId = new AutofillId(getAutofillViewId());
          }
          return mAutofillId;
      }
  
      /**
       * Sets the unique, logical identifier of this view in the activity, for autofill purposes.
       *
       * <p>The autofill id is created on demand, and this method should only be called when a view is
       * reused after {@link #dispatchProvideAutofillStructure(ViewStructure, int)} is called, as
       * that method creates a snapshot of the view that is passed along to the autofill service.
       *
       * <p>This method is typically used when view subtrees are recycled to represent different
       * content* &mdash;in this case, the autofill id can be saved before the view content is swapped
       * out, and restored later when it's swapped back in. For example:
       *
       * <pre>
       * EditText reusableView = ...;
       * ViewGroup parentView = ...;
       * AutofillManager afm = ...;
       *
       * // Swap out the view and change its contents
       * AutofillId oldId = reusableView.getAutofillId();
       * CharSequence oldText = reusableView.getText();
       * parentView.removeView(reusableView);
       * AutofillId newId = afm.getNextAutofillId();
       * reusableView.setText("New I am");
       * reusableView.setAutofillId(newId);
       * parentView.addView(reusableView);
       *
       * // Later, swap the old content back in
       * parentView.removeView(reusableView);
       * reusableView.setAutofillId(oldId);
       * reusableView.setText(oldText);
       * parentView.addView(reusableView);
       * </pre>
       *
       * @param id an autofill ID that is unique in the {@link android.app.Activity} hosting the view,
       * or {@code null} to reset it. Usually it's an id previously allocated to another view (and
       * obtained through {@link #getAutofillId()}), or a new value obtained through
       * {@link AutofillManager#getNextAutofillId()}.
       *
       * @throws IllegalStateException if the view is already {@link #isAttachedToWindow() attached to
       * a window}.
       *
       * @throws IllegalArgumentException if the id is an autofill id associated with a virtual view.
       */
      public void setAutofillId(@Nullable AutofillId id) {
          // TODO(b/37566627): add unit / CTS test for all possible combinations below
          if (Log.isLoggable(AUTOFILL_LOG_TAG, Log.VERBOSE)) {
              Log.v(AUTOFILL_LOG_TAG, "setAutofill(): from " + mAutofillId + " to " + id);
          }
          if (isAttachedToWindow()) {
              throw new IllegalStateException("Cannot set autofill id when view is attached");
          }
          if (id != null && !id.isNonVirtual()) {
              throw new IllegalStateException("Cannot set autofill id assigned to virtual views");
          }
          if (id == null && (mPrivateFlags3 & PFLAG3_AUTOFILLID_EXPLICITLY_SET) == 0) {
              // Ignore reset because it was never explicitly set before.
              return;
          }
          mAutofillId = id;
          if (id != null) {
              mAutofillViewId = id.getViewId();
              mPrivateFlags3 |= PFLAG3_AUTOFILLID_EXPLICITLY_SET;
          } else {
              mAutofillViewId = NO_ID;
              mPrivateFlags3 &= ~PFLAG3_AUTOFILLID_EXPLICITLY_SET;
          }
      }
  
      /**
       * Describes the autofill type of this view, so an
       * {@link android.service.autofill.AutofillService} can create the proper {@link AutofillValue}
       * when autofilling the view.
       *
       * <p>By default returns {@link #AUTOFILL_TYPE_NONE}, but views should override it to properly
       * support the Autofill Framework.
       *
       * @return either {@link #AUTOFILL_TYPE_NONE}, {@link #AUTOFILL_TYPE_TEXT},
       * {@link #AUTOFILL_TYPE_LIST}, {@link #AUTOFILL_TYPE_DATE}, or {@link #AUTOFILL_TYPE_TOGGLE}.
       *
       * @see #onProvideAutofillStructure(ViewStructure, int)
       * @see #autofill(AutofillValue)
       */
      public @AutofillType int getAutofillType() {
          return AUTOFILL_TYPE_NONE;
      }
  
      /**
       * Gets the hints that help an {@link android.service.autofill.AutofillService} determine how
       * to autofill the view with the user's data.
       *
       * <p>See {@link #setAutofillHints(String...)} for more info about these hints.
       *
       * @return The hints set via the attribute or {@link #setAutofillHints(String...)}, or
       * {@code null} if no hints were set.
       *
       * @attr ref android.R.styleable#View_autofillHints
       */
      @ViewDebug.ExportedProperty()
      @InspectableProperty
      @Nullable public String[] getAutofillHints() {
          return mAutofillHints;
      }
  
      /**
       * @hide
       */
      @TestApi
      public boolean isAutofilled() {
          return (mPrivateFlags3 & PFLAG3_IS_AUTOFILLED) != 0;
      }
  
      /**
       * Gets the {@link View}'s current autofill value.
       *
       * <p>By default returns {@code null}, but subclasses should override it and return an
       * appropriate value to properly support the Autofill Framework.
       *
       * @see #onProvideAutofillStructure(ViewStructure, int)
       * @see #autofill(AutofillValue)
       */
      @Nullable
      public AutofillValue getAutofillValue() {
          return null;
      }
  
      /**
       * Gets the mode for determining whether this view is important for autofill.
       *
       * <p>See {@link #setImportantForAutofill(int)} and {@link #isImportantForAutofill()} for more
       * info about this mode.
       *
       * @return {@link #IMPORTANT_FOR_AUTOFILL_AUTO} by default, or value passed to
       * {@link #setImportantForAutofill(int)}.
       *
       * @attr ref android.R.styleable#View_importantForAutofill
       */
      @ViewDebug.ExportedProperty(mapping = {
              @ViewDebug.IntToString(from = IMPORTANT_FOR_AUTOFILL_AUTO, to = "auto"),
              @ViewDebug.IntToString(from = IMPORTANT_FOR_AUTOFILL_YES, to = "yes"),
              @ViewDebug.IntToString(from = IMPORTANT_FOR_AUTOFILL_NO, to = "no"),
              @ViewDebug.IntToString(from = IMPORTANT_FOR_AUTOFILL_YES_EXCLUDE_DESCENDANTS,
                  to = "yesExcludeDescendants"),
              @ViewDebug.IntToString(from = IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS,
                  to = "noExcludeDescendants")})
      @InspectableProperty(enumMapping = {
              @EnumEntry(value = IMPORTANT_FOR_AUTOFILL_AUTO, name = "auto"),
              @EnumEntry(value = IMPORTANT_FOR_AUTOFILL_YES, name = "yes"),
              @EnumEntry(value = IMPORTANT_FOR_AUTOFILL_NO, name = "no"),
              @EnumEntry(value = IMPORTANT_FOR_AUTOFILL_YES_EXCLUDE_DESCENDANTS,
                      name = "yesExcludeDescendants"),
              @EnumEntry(value = IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS,
                      name = "noExcludeDescendants"),
      })
      public @AutofillImportance int getImportantForAutofill() {
          return (mPrivateFlags3
                  & PFLAG3_IMPORTANT_FOR_AUTOFILL_MASK) >> PFLAG3_IMPORTANT_FOR_AUTOFILL_SHIFT;
      }
  
      /**
       * Sets the mode for determining whether this view is considered important for autofill.
       *
       * <p>The platform determines the importance for autofill automatically but you
       * can use this method to customize the behavior. For example:
       *
       * <ol>
       *   <li>When the view contents is irrelevant for autofill (for example, a text field used in a
       *       "Captcha" challenge), it should be {@link #IMPORTANT_FOR_AUTOFILL_NO}.
       *   <li>When both the view and its children are irrelevant for autofill (for example, the root
       *       view of an activity containing a spreadhseet editor), it should be
       *       {@link #IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS}.
       *   <li>When the view content is relevant for autofill but its children aren't (for example,
       *       a credit card expiration date represented by a custom view that overrides the proper
       *       autofill methods and has 2 children representing the month and year), it should
       *       be {@link #IMPORTANT_FOR_AUTOFILL_YES_EXCLUDE_DESCENDANTS}.
       * </ol>
       *
       * <p><b>Note:</b> Setting the mode as {@link #IMPORTANT_FOR_AUTOFILL_NO} or
       * {@link #IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS} does not guarantee the view (and its
       * children) will be always be considered not important; for example, when the user explicitly
       * makes an autofill request, all views are considered important. See
       * {@link #isImportantForAutofill()} for more details about how the View's importance for
       * autofill is used.
       *
       * @param mode {@link #IMPORTANT_FOR_AUTOFILL_AUTO}, {@link #IMPORTANT_FOR_AUTOFILL_YES},
       * {@link #IMPORTANT_FOR_AUTOFILL_NO}, {@link #IMPORTANT_FOR_AUTOFILL_YES_EXCLUDE_DESCENDANTS},
       * or {@link #IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS}.
       *
       * @attr ref android.R.styleable#View_importantForAutofill
       */
      public void setImportantForAutofill(@AutofillImportance int mode) {
          mPrivateFlags3 &= ~PFLAG3_IMPORTANT_FOR_AUTOFILL_MASK;
          mPrivateFlags3 |= (mode << PFLAG3_IMPORTANT_FOR_AUTOFILL_SHIFT)
                  & PFLAG3_IMPORTANT_FOR_AUTOFILL_MASK;
      }
  
      /**
       * Hints the Android System whether the {@link android.app.assist.AssistStructure.ViewNode}
       * associated with this view is considered important for autofill purposes.
       *
       * <p>Generally speaking, a view is important for autofill if:
       * <ol>
       * <li>The view can be autofilled by an {@link android.service.autofill.AutofillService}.
       * <li>The view contents can help an {@link android.service.autofill.AutofillService}
       *     determine how other views can be autofilled.
       * <ol>
       *
       * <p>For example, view containers should typically return {@code false} for performance reasons
       * (since the important info is provided by their children), but if its properties have relevant
       * information (for example, a resource id called {@code credentials}, it should return
       * {@code true}. On the other hand, views representing labels or editable fields should
       * typically return {@code true}, but in some cases they could return {@code false}
       * (for example, if they're part of a "Captcha" mechanism).
       *
       * <p>The value returned by this method depends on the value returned by
       * {@link #getImportantForAutofill()}:
       *
       * <ol>
       *   <li>if it returns {@link #IMPORTANT_FOR_AUTOFILL_YES} or
       *       {@link #IMPORTANT_FOR_AUTOFILL_YES_EXCLUDE_DESCENDANTS}, then it returns {@code true}
       *   <li>if it returns {@link #IMPORTANT_FOR_AUTOFILL_NO} or
       *       {@link #IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS}, then it returns {@code false}
       *   <li>if it returns {@link #IMPORTANT_FOR_AUTOFILL_AUTO}, then it uses some simple heuristics
       *       that can return {@code true} in some cases (like a container with a resource id),
       *       but {@code false} in most.
       *   <li>otherwise, it returns {@code false}.
       * </ol>
       *
       * <p>When a view is considered important for autofill:
       * <ul>
       *   <li>The view might automatically trigger an autofill request when focused on.
       *   <li>The contents of the view are included in the {@link ViewStructure} used in an autofill
       *       request.
       * </ul>
       *
       * <p>On the other hand, when a view is considered not important for autofill:
       * <ul>
       *   <li>The view never automatically triggers autofill requests, but it can trigger a manual
       *       request through {@link AutofillManager#requestAutofill(View)}.
       *   <li>The contents of the view are not included in the {@link ViewStructure} used in an
       *       autofill request, unless the request has the
       *       {@link #AUTOFILL_FLAG_INCLUDE_NOT_IMPORTANT_VIEWS} flag.
       * </ul>
       *
       * @return whether the view is considered important for autofill.
       *
       * @see #setImportantForAutofill(int)
       * @see #IMPORTANT_FOR_AUTOFILL_AUTO
       * @see #IMPORTANT_FOR_AUTOFILL_YES
       * @see #IMPORTANT_FOR_AUTOFILL_NO
       * @see #IMPORTANT_FOR_AUTOFILL_YES_EXCLUDE_DESCENDANTS
       * @see #IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS
       * @see AutofillManager#requestAutofill(View)
       */
      public final boolean isImportantForAutofill() {
          // Check parent mode to ensure we're not hidden.
          ViewParent parent = mParent;
          while (parent instanceof View) {
              final int parentImportance = ((View) parent).getImportantForAutofill();
              if (parentImportance == IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS
                      || parentImportance == IMPORTANT_FOR_AUTOFILL_YES_EXCLUDE_DESCENDANTS) {
                  if (Log.isLoggable(AUTOFILL_LOG_TAG, Log.VERBOSE)) {
                      Log.v(AUTOFILL_LOG_TAG, "View (" +  this + ") is not important for autofill "
                              + "because parent " + parent + "'s importance is " + parentImportance);
                  }
                  return false;
              }
              parent = parent.getParent();
          }
  
          final int importance = getImportantForAutofill();
  
          // First, check the explicit states.
          if (importance == IMPORTANT_FOR_AUTOFILL_YES_EXCLUDE_DESCENDANTS
                  || importance == IMPORTANT_FOR_AUTOFILL_YES) {
              return true;
          }
          if (importance == IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS
                  || importance == IMPORTANT_FOR_AUTOFILL_NO) {
              if (Log.isLoggable(AUTOFILL_LOG_TAG, Log.VERBOSE)) {
                  Log.v(AUTOFILL_LOG_TAG, "View (" +  this + ") is not important for autofill "
                          + "because its importance is " + importance);
              }
              return false;
          }
  
          // Then use some heuristics to handle AUTO.
          if (importance != IMPORTANT_FOR_AUTOFILL_AUTO) {
              Log.w(AUTOFILL_LOG_TAG, "invalid autofill importance (" + importance + " on view "
                      + this);
              return false;
          }
  
          // Always include views that have an explicit resource id.
          final int id = mID;
          if (id != NO_ID && !isViewIdGenerated(id)) {
              final Resources res = getResources();
              String entry = null;
              String pkg = null;
              try {
                  entry = res.getResourceEntryName(id);
                  pkg = res.getResourcePackageName(id);
              } catch (Resources.NotFoundException e) {
                  // ignore
              }
              if (entry != null && pkg != null && pkg.equals(mContext.getPackageName())) {
                  return true;
              }
          }
  
          // If the app developer explicitly set hints for it, it's important.
          if (getAutofillHints() != null) {
              return true;
          }
  
          // Otherwise, assume it's not important...
          return false;
      }
  
      /**
       * Gets the mode for determining whether this view is important for content capture.
       *
       * <p>See {@link #setImportantForContentCapture(int)} and
       * {@link #isImportantForContentCapture()} for more info about this mode.
       *
       * @return {@link #IMPORTANT_FOR_CONTENT_CAPTURE_AUTO} by default, or value passed to
       * {@link #setImportantForContentCapture(int)}.
       *
       * @attr ref android.R.styleable#View_importantForContentCapture
       *
       * @hide
       */
      @ViewDebug.ExportedProperty(mapping = {
              @ViewDebug.IntToString(from = IMPORTANT_FOR_CONTENT_CAPTURE_AUTO, to = "auto"),
              @ViewDebug.IntToString(from = IMPORTANT_FOR_CONTENT_CAPTURE_YES, to = "yes"),
              @ViewDebug.IntToString(from = IMPORTANT_FOR_CONTENT_CAPTURE_NO, to = "no"),
              @ViewDebug.IntToString(from = IMPORTANT_FOR_CONTENT_CAPTURE_YES_EXCLUDE_DESCENDANTS,
                  to = "yesExcludeDescendants"),
              @ViewDebug.IntToString(from = IMPORTANT_FOR_CONTENT_CAPTURE_NO_EXCLUDE_DESCENDANTS,
                  to = "noExcludeDescendants")})
  //    @InspectableProperty(enumMapping = {
  //            @EnumEntry(value = IMPORTANT_FOR_CONTENT_CAPTURE_AUTO, name = "auto"),
  //            @EnumEntry(value = IMPORTANT_FOR_CONTENT_CAPTURE_YES, name = "yes"),
  //            @EnumEntry(value = IMPORTANT_FOR_CONTENT_CAPTURE_NO, name = "no"),
  //            @EnumEntry(value = IMPORTANT_FOR_CONTENT_CAPTURE_YES_EXCLUDE_DESCENDANTS,
  //                    name = "yesExcludeDescendants"),
  //            @EnumEntry(value = IMPORTANT_FOR_CONTENT_CAPTURE_NO_EXCLUDE_DESCENDANTS,
  //                    name = "noExcludeDescendants"),
  //    })
      @TestApi
      public @ContentCaptureImportance int getImportantForContentCapture() {
          // NOTE: the important for content capture values were the first flags added and are set in
          // the rightmost position, so we don't need to shift them
          return mPrivateFlags4 & PFLAG4_IMPORTANT_FOR_CONTENT_CAPTURE_MASK;
      }
  
      /**
       * Sets the mode for determining whether this view is considered important for content capture.
       *
       * <p>The platform determines the importance for autofill automatically but you
       * can use this method to customize the behavior. Typically, a view that provides text should
       * be marked as {@link #IMPORTANT_FOR_CONTENT_CAPTURE_YES}.
       *
       * @param mode {@link #IMPORTANT_FOR_CONTENT_CAPTURE_AUTO},
       * {@link #IMPORTANT_FOR_CONTENT_CAPTURE_YES}, {@link #IMPORTANT_FOR_CONTENT_CAPTURE_NO},
       * {@link #IMPORTANT_FOR_CONTENT_CAPTURE_YES_EXCLUDE_DESCENDANTS},
       * or {@link #IMPORTANT_FOR_CONTENT_CAPTURE_NO_EXCLUDE_DESCENDANTS}.
       *
       * @attr ref android.R.styleable#View_importantForContentCapture
       *
       * @hide
       */
      @TestApi
      public void setImportantForContentCapture(@ContentCaptureImportance int mode) {
          // Reset first
          mPrivateFlags4 &= ~PFLAG4_IMPORTANT_FOR_CONTENT_CAPTURE_MASK;
          // Then set again
          // NOTE: the important for content capture values were the first flags added and are set in
          // the rightmost position, so we don't need to shift them
          mPrivateFlags4 |= (mode & PFLAG4_IMPORTANT_FOR_CONTENT_CAPTURE_MASK);
      }
  
      /**
       * Hints the Android System whether this view is considered important for content capture, based
       * on the value explicitly set by {@link #setImportantForContentCapture(int)} and heuristics
       * when it's {@link #IMPORTANT_FOR_CONTENT_CAPTURE_AUTO}.
       *
       * <p>See {@link ContentCaptureManager} for more info about content capture.
       *
       * @return whether the view is considered important for content capture.
       *
       * @see #setImportantForContentCapture(int)
       * @see #IMPORTANT_FOR_CONTENT_CAPTURE_AUTO
       * @see #IMPORTANT_FOR_CONTENT_CAPTURE_YES
       * @see #IMPORTANT_FOR_CONTENT_CAPTURE_NO
       * @see #IMPORTANT_FOR_CONTENT_CAPTURE_YES_EXCLUDE_DESCENDANTS
       * @see #IMPORTANT_FOR_CONTENT_CAPTURE_NO_EXCLUDE_DESCENDANTS
       *
       * @hide
       */
      @TestApi
      public final boolean isImportantForContentCapture() {
          boolean isImportant;
          if ((mPrivateFlags4 & PFLAG4_CONTENT_CAPTURE_IMPORTANCE_IS_CACHED) != 0) {
              isImportant = (mPrivateFlags4 & PFLAG4_CONTENT_CAPTURE_IMPORTANCE_CACHED_VALUE) != 0;
              return isImportant;
          }
  
          isImportant = calculateIsImportantForContentCapture();
  
          mPrivateFlags4 &= ~PFLAG4_CONTENT_CAPTURE_IMPORTANCE_CACHED_VALUE;
          if (isImportant) {
              mPrivateFlags4 |= PFLAG4_CONTENT_CAPTURE_IMPORTANCE_CACHED_VALUE;
          }
          mPrivateFlags4 |= PFLAG4_CONTENT_CAPTURE_IMPORTANCE_IS_CACHED;
          return isImportant;
      }
  
      /**
       * Calculates whether the flag is important for content capture so it can be used by
       * {@link #isImportantForContentCapture()} while the tree is traversed.
       */
      private boolean calculateIsImportantForContentCapture() {
          // Check parent mode to ensure we're important
          ViewParent parent = mParent;
          while (parent instanceof View) {
              final int parentImportance = ((View) parent).getImportantForContentCapture();
              if (parentImportance == IMPORTANT_FOR_CONTENT_CAPTURE_NO_EXCLUDE_DESCENDANTS
                      || parentImportance == IMPORTANT_FOR_CONTENT_CAPTURE_YES_EXCLUDE_DESCENDANTS) {
                  if (Log.isLoggable(CONTENT_CAPTURE_LOG_TAG, Log.VERBOSE)) {
                      Log.v(CONTENT_CAPTURE_LOG_TAG, "View (" +  this + ") is not important for "
                              + "content capture because parent " + parent + "'s importance is "
                              + parentImportance);
                  }
                  return false;
              }
              parent = parent.getParent();
          }
  
          final int importance = getImportantForContentCapture();
  
          // First, check the explicit states.
          if (importance == IMPORTANT_FOR_CONTENT_CAPTURE_YES_EXCLUDE_DESCENDANTS
                  || importance == IMPORTANT_FOR_CONTENT_CAPTURE_YES) {
              return true;
          }
          if (importance == IMPORTANT_FOR_CONTENT_CAPTURE_NO_EXCLUDE_DESCENDANTS
                  || importance == IMPORTANT_FOR_CONTENT_CAPTURE_NO) {
              if (Log.isLoggable(CONTENT_CAPTURE_LOG_TAG, Log.VERBOSE)) {
                  Log.v(CONTENT_CAPTURE_LOG_TAG, "View (" +  this + ") is not important for content "
                          + "capture because its importance is " + importance);
              }
              return false;
          }
  
          // Then use some heuristics to handle AUTO.
          if (importance != IMPORTANT_FOR_CONTENT_CAPTURE_AUTO) {
              Log.w(CONTENT_CAPTURE_LOG_TAG, "invalid content capture importance (" + importance
                      + " on view " + this);
              return false;
          }
  
          // View group is important if at least one children also is
          if (this instanceof ViewGroup) {
              final ViewGroup group = (ViewGroup) this;
              for (int i = 0; i < group.getChildCount(); i++) {
                  final View child = group.getChildAt(i);
                  if (child.isImportantForContentCapture()) {
                      return true;
                  }
              }
          }
  
          // If the app developer explicitly set hints or autofill hintsfor it, it's important.
          if (getAutofillHints() != null) {
              return true;
          }
  
          // Otherwise, assume it's not important...
          return false;
      }
  
      /**
       * Helper used to notify the {@link ContentCaptureManager} when the view is removed or
       * added, based on whether it's laid out and visible, and without knowing if the parent removed
       * it from the view hierarchy.
       *
       * <p>This method is called from many places (visibility changed, view laid out, view attached
       * or detached to/from window, etc...) and hence must contain the logic to call the manager, as
       * described below:
       *
       * <ol>
       *   <li>It should only be called when content capture is enabled for the view.
       *   <li>It must call viewAppeared() before viewDisappeared()
       *   <li>viewAppearead() can only be called when the view is visible and laidout
       *   <li>It should not call the same event twice.
       * </ol>
       */
      private void notifyAppearedOrDisappearedForContentCaptureIfNeeded(boolean appeared) {
          AttachInfo ai = mAttachInfo;
          // Skip it while the view is being laided out for the first time
          if (ai != null && !ai.mReadyForContentCaptureUpdates) return;
  
          if (Trace.isTagEnabled(Trace.TRACE_TAG_VIEW)) {
              Trace.traceBegin(Trace.TRACE_TAG_VIEW,
                      "notifyContentCapture(" + appeared + ") for " + getClass().getSimpleName());
          }
          try {
              notifyAppearedOrDisappearedForContentCaptureIfNeededNoTrace(appeared);
          } finally {
              Trace.traceEnd(Trace.TRACE_TAG_VIEW);
          }
      }
  
      private void notifyAppearedOrDisappearedForContentCaptureIfNeededNoTrace(boolean appeared) {
          AttachInfo ai = mAttachInfo;
  
          // First check if context has client, so it saves a service lookup when it doesn't
          if (mContext.getContentCaptureOptions() == null) return;
  
          // Then check if it's enabled in the context...
          final ContentCaptureManager ccm = ai != null ? ai.getContentCaptureManager(mContext)
                  : mContext.getSystemService(ContentCaptureManager.class);
          if (ccm == null || !ccm.isContentCaptureEnabled()) return;
  
          // ... and finally at the view level
          // NOTE: isImportantForContentCapture() is more expensive than cm.isContentCaptureEnabled()
          if (!isImportantForContentCapture()) return;
  
          ContentCaptureSession session = getContentCaptureSession();
          if (session == null) return;
  
          if (appeared) {
              if (!isLaidOut() || getVisibility() != VISIBLE
                      || (mPrivateFlags4 & PFLAG4_NOTIFIED_CONTENT_CAPTURE_APPEARED) != 0) {
                  if (DEBUG_CONTENT_CAPTURE) {
                      Log.v(CONTENT_CAPTURE_LOG_TAG, "Ignoring 'appeared' on " + this + ": laid="
                              + isLaidOut() + ", visibleToUser=" + isVisibleToUser()
                              + ", visible=" + (getVisibility() == VISIBLE)
                              + ": alreadyNotifiedAppeared=" + ((mPrivateFlags4
                                      & PFLAG4_NOTIFIED_CONTENT_CAPTURE_APPEARED) != 0)
                              + ", alreadyNotifiedDisappeared=" + ((mPrivateFlags4
                                      & PFLAG4_NOTIFIED_CONTENT_CAPTURE_DISAPPEARED) != 0));
                  }
                  return;
              }
              setNotifiedContentCaptureAppeared();
  
              if (ai != null) {
                  ai.delayNotifyContentCaptureEvent(session, this, appeared);
              } else {
                  if (DEBUG_CONTENT_CAPTURE) {
                      Log.w(CONTENT_CAPTURE_LOG_TAG, "no AttachInfo on appeared for " + this);
                  }
              }
          } else {
              if ((mPrivateFlags4 & PFLAG4_NOTIFIED_CONTENT_CAPTURE_APPEARED) == 0
                      || (mPrivateFlags4 & PFLAG4_NOTIFIED_CONTENT_CAPTURE_DISAPPEARED) != 0) {
                  if (DEBUG_CONTENT_CAPTURE) {
                      Log.v(CONTENT_CAPTURE_LOG_TAG, "Ignoring 'disappeared' on " + this + ": laid="
                              + isLaidOut() + ", visibleToUser=" + isVisibleToUser()
                              + ", visible=" + (getVisibility() == VISIBLE)
                              + ": alreadyNotifiedAppeared=" + ((mPrivateFlags4
                                      & PFLAG4_NOTIFIED_CONTENT_CAPTURE_APPEARED) != 0)
                              + ", alreadyNotifiedDisappeared=" + ((mPrivateFlags4
                                      & PFLAG4_NOTIFIED_CONTENT_CAPTURE_DISAPPEARED) != 0));
                  }
                  return;
              }
              mPrivateFlags4 |= PFLAG4_NOTIFIED_CONTENT_CAPTURE_DISAPPEARED;
              mPrivateFlags4 &= ~PFLAG4_NOTIFIED_CONTENT_CAPTURE_APPEARED;
  
              if (ai != null) {
                  ai.delayNotifyContentCaptureEvent(session, this, appeared);
              } else {
                  if (DEBUG_CONTENT_CAPTURE) {
                      Log.v(CONTENT_CAPTURE_LOG_TAG, "no AttachInfo on disappeared for " + this);
                  }
              }
          }
      }
  
      private void setNotifiedContentCaptureAppeared() {
          mPrivateFlags4 |= PFLAG4_NOTIFIED_CONTENT_CAPTURE_APPEARED;
          mPrivateFlags4 &= ~PFLAG4_NOTIFIED_CONTENT_CAPTURE_DISAPPEARED;
      }
  
      /** @hide */
      protected boolean getNotifiedContentCaptureAppeared() {
          return (mPrivateFlags4 & PFLAG4_NOTIFIED_CONTENT_CAPTURE_APPEARED) != 0;
      }
  
  
      /**
       * Sets the (optional) {@link ContentCaptureSession} associated with this view.
       *
       * <p>This method should be called when you need to associate a {@link ContentCaptureContext} to
       * the content capture events associated with this view or its view hierarchy (if it's a
       * {@link ViewGroup}).
       *
       * <p>For example, if your activity is associated with a web domain, first you would need to
       * set the context for the main DOM:
       *
       * <pre>
       *   ContentCaptureSession mainSession = rootView.getContentCaptureSession();
       *   mainSession.setContentCaptureContext(ContentCaptureContext.forLocusId(Uri.parse(myUrl));
       * </pre>
       *
       * <p>Then if the page had an {@code IFRAME}, you would create a new session for it:
       *
       * <pre>
       *   ContentCaptureSession iframeSession = mainSession.createContentCaptureSession(
       *       ContentCaptureContext.forLocusId(Uri.parse(iframeUrl)));
       *   iframeView.setContentCaptureSession(iframeSession);
       * </pre>
       *
       * @param contentCaptureSession a session created by
       * {@link ContentCaptureSession#createContentCaptureSession(
       *        android.view.contentcapture.ContentCaptureContext)}.
       */
      public void setContentCaptureSession(@Nullable ContentCaptureSession contentCaptureSession) {
          mContentCaptureSession = contentCaptureSession;
      }
  
      /**
       * Gets the session used to notify content capture events.
       *
       * @return session explicitly set by {@link #setContentCaptureSession(ContentCaptureSession)},
       * inherited by ancestors, default session or {@code null} if content capture is disabled for
       * this view.
       */
      @Nullable
      public final ContentCaptureSession getContentCaptureSession() {
          if (mCachedContentCaptureSession != null) {
              return mCachedContentCaptureSession;
          }
  
          mCachedContentCaptureSession = getAndCacheContentCaptureSession();
          return mCachedContentCaptureSession;
      }
  
      @Nullable
      private ContentCaptureSession getAndCacheContentCaptureSession() {
          // First try the session explicitly set by setContentCaptureSession()
          if (mContentCaptureSession != null) return mContentCaptureSession;
  
          // Then the session explicitly set in an ancestor
          ContentCaptureSession session = null;
          if (mParent instanceof View) {
              session = ((View) mParent).getContentCaptureSession();
          }
  
          // Finally, if no session was explicitly set, use the context's default session.
          if (session == null) {
              final ContentCaptureManager ccm = mContext
                      .getSystemService(ContentCaptureManager.class);
              return ccm == null ? null : ccm.getMainContentCaptureSession();
          }
          return session;
      }
  
      @Nullable
      private AutofillManager getAutofillManager() {
          return mContext.getSystemService(AutofillManager.class);
      }
  
      private boolean isAutofillable() {
          if (getAutofillType() == AUTOFILL_TYPE_NONE) return false;
  
          if (!isImportantForAutofill()) {
              // View is not important for "regular" autofill, so we must check if Augmented Autofill
              // is enabled for the activity
              final AutofillOptions options = mContext.getAutofillOptions();
              if (options == null || !options.isAugmentedAutofillEnabled(mContext)) {
                  return false;
              }
              final AutofillManager afm = getAutofillManager();
              if (afm == null) return false;
              afm.notifyViewEnteredForAugmentedAutofill(this);
          }
  
          return getAutofillViewId() > LAST_APP_AUTOFILL_ID;
      }
  
      /** @hide */
      public boolean canNotifyAutofillEnterExitEvent() {
          return isAutofillable() && isAttachedToWindow();
      }
  
      private void populateVirtualStructure(ViewStructure structure,
              AccessibilityNodeProvider provider, AccessibilityNodeInfo info,
              boolean forAutofill) {
          structure.setId(AccessibilityNodeInfo.getVirtualDescendantId(info.getSourceNodeId()),
                  null, null, info.getViewIdResourceName());
          Rect rect = structure.getTempRect();
          info.getBoundsInParent(rect);
          structure.setDimens(rect.left, rect.top, 0, 0, rect.width(), rect.height());
          structure.setVisibility(VISIBLE);
          structure.setEnabled(info.isEnabled());
          if (info.isClickable()) {
              structure.setClickable(true);
          }
          if (info.isFocusable()) {
              structure.setFocusable(true);
          }
          if (info.isFocused()) {
              structure.setFocused(true);
          }
          if (info.isAccessibilityFocused()) {
              structure.setAccessibilityFocused(true);
          }
          if (info.isSelected()) {
              structure.setSelected(true);
          }
          if (info.isLongClickable()) {
              structure.setLongClickable(true);
          }
          if (info.isCheckable()) {
              structure.setCheckable(true);
              if (info.isChecked()) {
                  structure.setChecked(true);
              }
          }
          if (info.isContextClickable()) {
              structure.setContextClickable(true);
          }
          if (forAutofill) {
              structure.setAutofillId(new AutofillId(getAutofillId(),
                      AccessibilityNodeInfo.getVirtualDescendantId(info.getSourceNodeId())));
          }
          CharSequence cname = info.getClassName();
          structure.setClassName(cname != null ? cname.toString() : null);
          structure.setContentDescription(info.getContentDescription());
          if (forAutofill) {
              final int maxTextLength = info.getMaxTextLength();
              if (maxTextLength != -1) {
                  structure.setMaxTextLength(maxTextLength);
              }
              structure.setHint(info.getHintText());
          }
          CharSequence text = info.getText();
          boolean hasText = text != null || info.getError() != null;
          if (hasText) {
              structure.setText(text, info.getTextSelectionStart(), info.getTextSelectionEnd());
          }
          if (forAutofill) {
              if (info.isEditable()) {
                  structure.setDataIsSensitive(true);
                  if (hasText) {
                      structure.setAutofillType(AUTOFILL_TYPE_TEXT);
                      structure.setAutofillValue(AutofillValue.forText(text));
                  }
                  int inputType = info.getInputType();
                  if (inputType == 0 && info.isPassword()) {
                      inputType = InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD;
                  }
                  structure.setInputType(inputType);
              } else {
                  structure.setDataIsSensitive(false);
              }
          }
          final int NCHILDREN = info.getChildCount();
          if (NCHILDREN > 0) {
              structure.setChildCount(NCHILDREN);
              for (int i=0; i<NCHILDREN; i++) {
                  if (AccessibilityNodeInfo.getVirtualDescendantId(info.getChildNodeIds().get(i))
                          == AccessibilityNodeProvider.HOST_VIEW_ID) {
                      Log.e(VIEW_LOG_TAG, "Virtual view pointing to its host. Ignoring");
                      continue;
                  }
                  AccessibilityNodeInfo cinfo = provider.createAccessibilityNodeInfo(
                          AccessibilityNodeInfo.getVirtualDescendantId(info.getChildId(i)));
                  ViewStructure child = structure.newChild(i);
                  populateVirtualStructure(child, provider, cinfo, forAutofill);
                  cinfo.recycle();
              }
          }
      }
  
      /**
       * Dispatch creation of {@link ViewStructure} down the hierarchy.  The default
       * implementation calls {@link #onProvideStructure} and
       * {@link #onProvideVirtualStructure}.
       */
      public void dispatchProvideStructure(ViewStructure structure) {
          dispatchProvideStructure(structure, VIEW_STRUCTURE_FOR_ASSIST, /* flags= */ 0);
      }
  
      /**
       * Dispatches creation of a {@link ViewStructure}s for autofill purposes down the hierarchy,
       * when an Assist structure is being created as part of an autofill request.
       *
       * <p>The default implementation does the following:
       * <ul>
       *   <li>Sets the {@link AutofillId} in the structure.
       *   <li>Calls {@link #onProvideAutofillStructure(ViewStructure, int)}.
       *   <li>Calls {@link #onProvideAutofillVirtualStructure(ViewStructure, int)}.
       * </ul>
       *
       * <p>Typically, this method should only be overridden by subclasses that provide a view
       * hierarchy (such as {@link ViewGroup}) - other classes should override
       * {@link #onProvideAutofillStructure(ViewStructure, int)} or
       * {@link #onProvideAutofillVirtualStructure(ViewStructure, int)} instead.
       *
       * <p>When overridden, it must:
       *
       * <ul>
       *   <li>Either call
       *       {@code super.dispatchProvideAutofillStructure(structure, flags)} or explicitly
       *       set the {@link AutofillId} in the structure (for example, by calling
       *       {@code structure.setAutofillId(getAutofillId())}).
       *   <li>Decide how to handle the {@link #AUTOFILL_FLAG_INCLUDE_NOT_IMPORTANT_VIEWS} flag - when
       *       set, all views in the structure should be considered important for autofill,
       *       regardless of what {@link #isImportantForAutofill()} returns. We encourage you to
       *       respect this flag to provide a better user experience - this flag is typically used
       *       when an user explicitly requested autofill. If the flag is not set,
       *       then only views marked as important for autofill should be included in the
       *       structure - skipping non-important views optimizes the overall autofill performance.
       * </ul>
       *
       * @param structure fill in with structured view data for autofill purposes.
       * @param flags optional flags.
       *
       * @see #AUTOFILL_FLAG_INCLUDE_NOT_IMPORTANT_VIEWS
       */
      public void dispatchProvideAutofillStructure(@NonNull ViewStructure structure,
              @AutofillFlags int flags) {
          dispatchProvideStructure(structure, VIEW_STRUCTURE_FOR_AUTOFILL, flags);
      }
  
      private void dispatchProvideStructure(@NonNull ViewStructure structure,
              @ViewStructureType int viewFor, @AutofillFlags int flags) {
          if (viewFor == VIEW_STRUCTURE_FOR_AUTOFILL) {
              structure.setAutofillId(getAutofillId());
              onProvideAutofillStructure(structure, flags);
              onProvideAutofillVirtualStructure(structure, flags);
          } else if (!isAssistBlocked()) {
              onProvideStructure(structure);
              onProvideVirtualStructure(structure);
          } else {
              structure.setClassName(getAccessibilityClassName().toString());
              structure.setAssistBlocked(true);
          }
      }
  
      /**
       * Dispatches the initial content capture events for a view structure.
       *
       * @hide
       */
      public void dispatchInitialProvideContentCaptureStructure() {
          AttachInfo ai = mAttachInfo;
          if (ai == null) {
              Log.w(CONTENT_CAPTURE_LOG_TAG,
                      "dispatchProvideContentCaptureStructure(): no AttachInfo for " + this);
              return;
          }
          ContentCaptureManager ccm = ai.mContentCaptureManager;
          if (ccm == null) {
              Log.w(CONTENT_CAPTURE_LOG_TAG, "dispatchProvideContentCaptureStructure(): "
                      + "no ContentCaptureManager for " + this);
              return;
          }
  
          // We must set it before checkign if the view itself is important, because it might
          // initially not be (for example, if it's empty), although that might change later (for
          // example, if important views are added)
          ai.mReadyForContentCaptureUpdates = true;
  
          if (!isImportantForContentCapture()) {
              if (Log.isLoggable(CONTENT_CAPTURE_LOG_TAG, Log.DEBUG)) {
                  Log.d(CONTENT_CAPTURE_LOG_TAG,
                          "dispatchProvideContentCaptureStructure(): decorView is not important");
              }
              return;
          }
  
          ai.mContentCaptureManager = ccm;
  
          ContentCaptureSession session = getContentCaptureSession();
          if (session == null) {
              if (Log.isLoggable(CONTENT_CAPTURE_LOG_TAG, Log.DEBUG)) {
                  Log.d(CONTENT_CAPTURE_LOG_TAG,
                          "dispatchProvideContentCaptureStructure(): no session for " + this);
              }
              return;
          }
  
          session.internalNotifyViewTreeEvent(/* started= */ true);
          try {
              dispatchProvideContentCaptureStructure();
          } finally {
              session.internalNotifyViewTreeEvent(/* started= */ false);
          }
      }
  
      /** @hide */
      void dispatchProvideContentCaptureStructure() {
          ContentCaptureSession session = getContentCaptureSession();
          if (session != null) {
              ViewStructure structure = session.newViewStructure(this);
              onProvideContentCaptureStructure(structure, /* flags= */ 0);
              setNotifiedContentCaptureAppeared();
              session.notifyViewAppeared(structure);
          }
      }
  
      /**
       * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
       *
       * Note: Called from the default {@link AccessibilityDelegate}.
       *
       * @hide
       */
      public void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) {
          if (mAttachInfo == null) {
              return;
          }
  
          Rect bounds = mAttachInfo.mTmpInvalRect;
  
          getDrawingRect(bounds);
          info.setBoundsInParent(bounds);
  
          getBoundsOnScreen(bounds, true);
          info.setBoundsInScreen(bounds);
  
          ViewParent parent = getParentForAccessibility();
          if (parent instanceof View) {
              info.setParent((View) parent);
          }
  
          if (mID != View.NO_ID) {
              View rootView = getRootView();
              if (rootView == null) {
                  rootView = this;
              }
  
              View label = rootView.findLabelForView(this, mID);
              if (label != null) {
                  info.setLabeledBy(label);
              }
  
              if ((mAttachInfo.mAccessibilityFetchFlags
                      & AccessibilityNodeInfo.FLAG_REPORT_VIEW_IDS) != 0
                      && Resources.resourceHasPackage(mID)) {
                  try {
                      String viewId = getResources().getResourceName(mID);
                      info.setViewIdResourceName(viewId);
                  } catch (Resources.NotFoundException nfe) {
                      /* ignore */
                  }
              }
          }
  
          if (mLabelForId != View.NO_ID) {
              View rootView = getRootView();
              if (rootView == null) {
                  rootView = this;
              }
              View labeled = rootView.findViewInsideOutShouldExist(this, mLabelForId);
              if (labeled != null) {
                  info.setLabelFor(labeled);
              }
          }
  
          if (mAccessibilityTraversalBeforeId != View.NO_ID) {
              View rootView = getRootView();
              if (rootView == null) {
                  rootView = this;
              }
              View next = rootView.findViewInsideOutShouldExist(this,
                      mAccessibilityTraversalBeforeId);
              if (next != null && next.includeForAccessibility()) {
                  info.setTraversalBefore(next);
              }
          }
  
          if (mAccessibilityTraversalAfterId != View.NO_ID) {
              View rootView = getRootView();
              if (rootView == null) {
                  rootView = this;
              }
              View next = rootView.findViewInsideOutShouldExist(this,
                      mAccessibilityTraversalAfterId);
              if (next != null && next.includeForAccessibility()) {
                  info.setTraversalAfter(next);
              }
          }
  
          info.setVisibleToUser(isVisibleToUser());
  
          info.setImportantForAccessibility(isImportantForAccessibility());
          info.setPackageName(mContext.getPackageName());
          info.setClassName(getAccessibilityClassName());
          info.setContentDescription(getContentDescription());
  
          info.setEnabled(isEnabled());
          info.setClickable(isClickable());
          info.setFocusable(isFocusable());
          info.setScreenReaderFocusable(isScreenReaderFocusable());
          info.setFocused(isFocused());
          info.setAccessibilityFocused(isAccessibilityFocused());
          info.setSelected(isSelected());
          info.setLongClickable(isLongClickable());
          info.setContextClickable(isContextClickable());
          info.setLiveRegion(getAccessibilityLiveRegion());
          if ((mTooltipInfo != null) && (mTooltipInfo.mTooltipText != null)) {
              info.setTooltipText(mTooltipInfo.mTooltipText);
              info.addAction((mTooltipInfo.mTooltipPopup == null)
                      ? AccessibilityNodeInfo.AccessibilityAction.ACTION_SHOW_TOOLTIP
                      : AccessibilityNodeInfo.AccessibilityAction.ACTION_HIDE_TOOLTIP);
          }
  
          // TODO: These make sense only if we are in an AdapterView but all
          // views can be selected. Maybe from accessibility perspective
          // we should report as selectable view in an AdapterView.
          info.addAction(AccessibilityNodeInfo.ACTION_SELECT);
          info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION);
  
          if (isFocusable()) {
              if (isFocused()) {
                  info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS);
              } else {
                  info.addAction(AccessibilityNodeInfo.ACTION_FOCUS);
              }
          }
  
          if (!isAccessibilityFocused()) {
              info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS);
          } else {
              info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS);
          }
  
          if (isClickable() && isEnabled()) {
              info.addAction(AccessibilityNodeInfo.ACTION_CLICK);
          }
  
          if (isLongClickable() && isEnabled()) {
              info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK);
          }
  
          if (isContextClickable() && isEnabled()) {
              info.addAction(AccessibilityAction.ACTION_CONTEXT_CLICK);
          }
  
          CharSequence text = getIterableTextForAccessibility();
          if (text != null && text.length() > 0) {
              info.setTextSelection(getAccessibilitySelectionStart(), getAccessibilitySelectionEnd());
  
              info.addAction(AccessibilityNodeInfo.ACTION_SET_SELECTION);
              info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY);
              info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY);
              info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER
                      | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD
                      | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH);
          }
  
          info.addAction(AccessibilityAction.ACTION_SHOW_ON_SCREEN);
          populateAccessibilityNodeInfoDrawingOrderInParent(info);
          info.setPaneTitle(mAccessibilityPaneTitle);
          info.setHeading(isAccessibilityHeading());
  
          if (mTouchDelegate != null) {
              info.setTouchDelegateInfo(mTouchDelegate.getTouchDelegateInfo());
          }
      }
  
      /**
       * Adds extra data to an {@link AccessibilityNodeInfo} based on an explicit request for the
       * additional data.
       * <p>
       * This method only needs overloading if the node is marked as having extra data available.
       * </p>
       *
       * @param info The info to which to add the extra data. Never {@code null}.
       * @param extraDataKey A key specifying the type of extra data to add to the info. The
       *                     extra data should be added to the {@link Bundle} returned by
       *                     the info's {@link AccessibilityNodeInfo#getExtras} method. Never
       *                     {@code null}.
       * @param arguments A {@link Bundle} holding any arguments relevant for this request. May be
       *                  {@code null} if the service provided no arguments.
       *
       * @see AccessibilityNodeInfo#setAvailableExtraData(List)
       */
      public void addExtraDataToAccessibilityNodeInfo(
              @NonNull AccessibilityNodeInfo info, @NonNull String extraDataKey,
              @Nullable Bundle arguments) {
      }
  
      /**
       * Determine the order in which this view will be drawn relative to its siblings for a11y
       *
       * @param info The info whose drawing order should be populated
       */
      private void populateAccessibilityNodeInfoDrawingOrderInParent(AccessibilityNodeInfo info) {
          /*
           * If the view's bounds haven't been set yet, layout has not completed. In that situation,
           * drawing order may not be well-defined, and some Views with custom drawing order may
           * not be initialized sufficiently to respond properly getChildDrawingOrder.
           */
          if ((mPrivateFlags & PFLAG_HAS_BOUNDS) == 0) {
              info.setDrawingOrder(0);
              return;
          }
          int drawingOrderInParent = 1;
          // Iterate up the hierarchy if parents are not important for a11y
          View viewAtDrawingLevel = this;
          final ViewParent parent = getParentForAccessibility();
          while (viewAtDrawingLevel != parent) {
              final ViewParent currentParent = viewAtDrawingLevel.getParent();
              if (!(currentParent instanceof ViewGroup)) {
                  // Should only happen for the Decor
                  drawingOrderInParent = 0;
                  break;
              } else {
                  final ViewGroup parentGroup = (ViewGroup) currentParent;
                  final int childCount = parentGroup.getChildCount();
                  if (childCount > 1) {
                      List<View> preorderedList = parentGroup.buildOrderedChildList();
                      if (preorderedList != null) {
                          final int childDrawIndex = preorderedList.indexOf(viewAtDrawingLevel);
                          for (int i = 0; i < childDrawIndex; i++) {
                              drawingOrderInParent += numViewsForAccessibility(preorderedList.get(i));
                          }
                      } else {
                          final int childIndex = parentGroup.indexOfChild(viewAtDrawingLevel);
                          final boolean customOrder = parentGroup.isChildrenDrawingOrderEnabled();
                          final int childDrawIndex = ((childIndex >= 0) && customOrder) ? parentGroup
                                  .getChildDrawingOrder(childCount, childIndex) : childIndex;
                          final int numChildrenToIterate = customOrder ? childCount : childDrawIndex;
                          if (childDrawIndex != 0) {
                              for (int i = 0; i < numChildrenToIterate; i++) {
                                  final int otherDrawIndex = (customOrder ?
                                          parentGroup.getChildDrawingOrder(childCount, i) : i);
                                  if (otherDrawIndex < childDrawIndex) {
                                      drawingOrderInParent +=
                                              numViewsForAccessibility(parentGroup.getChildAt(i));
                                  }
                              }
                          }
                      }
                  }
              }
              viewAtDrawingLevel = (View) currentParent;
          }
          info.setDrawingOrder(drawingOrderInParent);
      }
  
      private static int numViewsForAccessibility(View view) {
          if (view != null) {
              if (view.includeForAccessibility()) {
                  return 1;
              } else if (view instanceof ViewGroup) {
                  return ((ViewGroup) view).getNumChildrenForAccessibility();
              }
          }
          return 0;
      }
  
      private View findLabelForView(View view, int labeledId) {
          if (mMatchLabelForPredicate == null) {
              mMatchLabelForPredicate = new MatchLabelForPredicate();
          }
          mMatchLabelForPredicate.mLabeledId = labeledId;
          return findViewByPredicateInsideOut(view, mMatchLabelForPredicate);
      }
  
      /**
       * Computes whether this virtual autofill view is visible to the user.
       *
       * <p><b>Note: </b>By default it returns {@code true}, but views providing a virtual hierarchy
       * view must override it.
       *
       * @return Whether the view is visible on the screen.
       */
      public boolean isVisibleToUserForAutofill(int virtualId) {
          if (mContext.isAutofillCompatibilityEnabled()) {
              final AccessibilityNodeProvider provider = getAccessibilityNodeProvider();
              if (provider != null) {
                  final AccessibilityNodeInfo node = provider.createAccessibilityNodeInfo(virtualId);
                  if (node != null) {
                      return node.isVisibleToUser();
                  }
                  // if node is null, assume it's not visible anymore
              } else {
                  Log.w(VIEW_LOG_TAG, "isVisibleToUserForAutofill(" + virtualId + "): no provider");
              }
              return false;
          }
          return true;
      }
  
      /**
       * Computes whether this view is visible to the user. Such a view is
       * attached, visible, all its predecessors are visible, it is not clipped
       * entirely by its predecessors, and has an alpha greater than zero.
       *
       * @return Whether the view is visible on the screen.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public boolean isVisibleToUser() {
          return isVisibleToUser(null);
      }
  
      /**
       * Computes whether the given portion of this view is visible to the user.
       * Such a view is attached, visible, all its predecessors are visible,
       * has an alpha greater than zero, and the specified portion is not
       * clipped entirely by its predecessors.
       *
       * @param boundInView the portion of the view to test; coordinates should be relative; may be
       *                    <code>null</code>, and the entire view will be tested in this case.
       *                    When <code>true</code> is returned by the function, the actual visible
       *                    region will be stored in this parameter; that is, if boundInView is fully
       *                    contained within the view, no modification will be made, otherwise regions
       *                    outside of the visible area of the view will be clipped.
       *
       * @return Whether the specified portion of the view is visible on the screen.
       *
       * @hide
       */
      @UnsupportedAppUsage
      protected boolean isVisibleToUser(Rect boundInView) {
          if (mAttachInfo != null) {
              // Attached to invisible window means this view is not visible.
              if (mAttachInfo.mWindowVisibility != View.VISIBLE) {
                  return false;
              }
              // An invisible predecessor or one with alpha zero means
              // that this view is not visible to the user.
              Object current = this;
              while (current instanceof View) {
                  View view = (View) current;
                  // We have attach info so this view is attached and there is no
                  // need to check whether we reach to ViewRootImpl on the way up.
                  if (view.getAlpha() <= 0 || view.getTransitionAlpha() <= 0 ||
                          view.getVisibility() != VISIBLE) {
                      return false;
                  }
                  current = view.mParent;
              }
              // Check if the view is entirely covered by its predecessors.
              Rect visibleRect = mAttachInfo.mTmpInvalRect;
              Point offset = mAttachInfo.mPoint;
              if (!getGlobalVisibleRect(visibleRect, offset)) {
                  return false;
              }
              // Check if the visible portion intersects the rectangle of interest.
              if (boundInView != null) {
                  visibleRect.offset(-offset.x, -offset.y);
                  return boundInView.intersect(visibleRect);
              }
              return true;
          }
          return false;
      }
  
      /**
       * Returns the delegate for implementing accessibility support via
       * composition. For more details see {@link AccessibilityDelegate}.
       *
       * @return The delegate, or null if none set.
       */
      public AccessibilityDelegate getAccessibilityDelegate() {
          return mAccessibilityDelegate;
      }
  
      /**
       * Sets a delegate for implementing accessibility support via composition
       * (as opposed to inheritance). For more details, see
       * {@link AccessibilityDelegate}.
       * <p>
       * <strong>Note:</strong> On platform versions prior to
       * {@link android.os.Build.VERSION_CODES#M API 23}, delegate methods on
       * views in the {@code android.widget.*} package are called <i>before</i>
       * host methods. This prevents certain properties such as class name from
       * being modified by overriding
       * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)},
       * as any changes will be overwritten by the host class.
       * <p>
       * Starting in {@link android.os.Build.VERSION_CODES#M API 23}, delegate
       * methods are called <i>after</i> host methods, which all properties to be
       * modified without being overwritten by the host class.
       *
       * @param delegate the object to which accessibility method calls should be
       *                 delegated
       * @see AccessibilityDelegate
       */
      public void setAccessibilityDelegate(@Nullable AccessibilityDelegate delegate) {
          mAccessibilityDelegate = delegate;
      }
  
      /**
       * Gets the provider for managing a virtual view hierarchy rooted at this View
       * and reported to {@link android.accessibilityservice.AccessibilityService}s
       * that explore the window content.
       * <p>
       * If this method returns an instance, this instance is responsible for managing
       * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this
       * View including the one representing the View itself. Similarly the returned
       * instance is responsible for performing accessibility actions on any virtual
       * view or the root view itself.
       * </p>
       * <p>
       * If an {@link AccessibilityDelegate} has been specified via calling
       * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
       * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)}
       * is responsible for handling this call.
       * </p>
       *
       * @return The provider.
       *
       * @see AccessibilityNodeProvider
       */
      public AccessibilityNodeProvider getAccessibilityNodeProvider() {
          if (mAccessibilityDelegate != null) {
              return mAccessibilityDelegate.getAccessibilityNodeProvider(this);
          } else {
              return null;
          }
      }
  
      /**
       * Gets the unique identifier of this view on the screen for accessibility purposes.
       *
       * @return The view accessibility id.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public int getAccessibilityViewId() {
          if (mAccessibilityViewId == NO_ID) {
              mAccessibilityViewId = sNextAccessibilityViewId++;
          }
          return mAccessibilityViewId;
      }
  
      /**
       * Gets the unique identifier of this view on the screen for autofill purposes.
       *
       * @return The view autofill id.
       *
       * @hide
       */
      public int getAutofillViewId() {
          if (mAutofillViewId == NO_ID) {
              mAutofillViewId = mContext.getNextAutofillId();
          }
          return mAutofillViewId;
      }
  
      /**
       * Gets the unique identifier of the window in which this View resides.
       *
       * @return The window accessibility id.
       *
       * @hide
       */
      public int getAccessibilityWindowId() {
          return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId
                  : AccessibilityWindowInfo.UNDEFINED_WINDOW_ID;
      }
  
      /**
       * Returns the {@link View}'s content description.
       * <p>
       * <strong>Note:</strong> Do not override this method, as it will have no
       * effect on the content description presented to accessibility services.
       * You must call {@link #setContentDescription(CharSequence)} to modify the
       * content description.
       *
       * @return the content description
       * @see #setContentDescription(CharSequence)
       * @attr ref android.R.styleable#View_contentDescription
       */
      @ViewDebug.ExportedProperty(category = "accessibility")
      @InspectableProperty
      public CharSequence getContentDescription() {
          return mContentDescription;
      }
  
      /**
       * Sets the {@link View}'s content description.
       * <p>
       * A content description briefly describes the view and is primarily used
       * for accessibility support to determine how a view should be presented to
       * the user. In the case of a view with no textual representation, such as
       * {@link android.widget.ImageButton}, a useful content description
       * explains what the view does. For example, an image button with a phone
       * icon that is used to place a call may use "Call" as its content
       * description. An image of a floppy disk that is used to save a file may
       * use "Save".
       *
       * @param contentDescription The content description.
       * @see #getContentDescription()
       * @attr ref android.R.styleable#View_contentDescription
       */
      @RemotableViewMethod
      public void setContentDescription(CharSequence contentDescription) {
          if (mContentDescription == null) {
              if (contentDescription == null) {
                  return;
              }
          } else if (mContentDescription.equals(contentDescription)) {
              return;
          }
          mContentDescription = contentDescription;
          final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0;
          if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
              setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES);
              notifySubtreeAccessibilityStateChangedIfNeeded();
          } else {
              notifyViewAccessibilityStateChangedIfNeeded(
                      AccessibilityEvent.CONTENT_CHANGE_TYPE_CONTENT_DESCRIPTION);
          }
      }
  
      /**
       * Sets the id of a view before which this one is visited in accessibility traversal.
       * A screen-reader must visit the content of this view before the content of the one
       * it precedes. For example, if view B is set to be before view A, then a screen-reader
       * will traverse the entire content of B before traversing the entire content of A,
       * regardles of what traversal strategy it is using.
       * <p>
       * Views that do not have specified before/after relationships are traversed in order
       * determined by the screen-reader.
       * </p>
       * <p>
       * Setting that this view is before a view that is not important for accessibility
       * or if this view is not important for accessibility will have no effect as the
       * screen-reader is not aware of unimportant views.
       * </p>
       *
       * @param beforeId The id of a view this one precedes in accessibility traversal.
       *
       * @attr ref android.R.styleable#View_accessibilityTraversalBefore
       *
       * @see #setImportantForAccessibility(int)
       */
      @RemotableViewMethod
      public void setAccessibilityTraversalBefore(@IdRes int beforeId) {
          if (mAccessibilityTraversalBeforeId == beforeId) {
              return;
          }
          mAccessibilityTraversalBeforeId = beforeId;
          notifyViewAccessibilityStateChangedIfNeeded(
                  AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
      }
  
      /**
       * Gets the id of a view before which this one is visited in accessibility traversal.
       *
       * @return The id of a view this one precedes in accessibility traversal if
       *         specified, otherwise {@link #NO_ID}.
       *
       * @see #setAccessibilityTraversalBefore(int)
       */
      @IdRes
      @InspectableProperty
      public int getAccessibilityTraversalBefore() {
          return mAccessibilityTraversalBeforeId;
      }
  
      /**
       * Sets the id of a view after which this one is visited in accessibility traversal.
       * A screen-reader must visit the content of the other view before the content of this
       * one. For example, if view B is set to be after view A, then a screen-reader
       * will traverse the entire content of A before traversing the entire content of B,
       * regardles of what traversal strategy it is using.
       * <p>
       * Views that do not have specified before/after relationships are traversed in order
       * determined by the screen-reader.
       * </p>
       * <p>
       * Setting that this view is after a view that is not important for accessibility
       * or if this view is not important for accessibility will have no effect as the
       * screen-reader is not aware of unimportant views.
       * </p>
       *
       * @param afterId The id of a view this one succedees in accessibility traversal.
       *
       * @attr ref android.R.styleable#View_accessibilityTraversalAfter
       *
       * @see #setImportantForAccessibility(int)
       */
      @RemotableViewMethod
      public void setAccessibilityTraversalAfter(@IdRes int afterId) {
          if (mAccessibilityTraversalAfterId == afterId) {
              return;
          }
          mAccessibilityTraversalAfterId = afterId;
          notifyViewAccessibilityStateChangedIfNeeded(
                  AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
      }
  
      /**
       * Gets the id of a view after which this one is visited in accessibility traversal.
       *
       * @return The id of a view this one succeedes in accessibility traversal if
       *         specified, otherwise {@link #NO_ID}.
       *
       * @see #setAccessibilityTraversalAfter(int)
       */
      @IdRes
      @InspectableProperty
      public int getAccessibilityTraversalAfter() {
          return mAccessibilityTraversalAfterId;
      }
  
      /**
       * Gets the id of a view for which this view serves as a label for
       * accessibility purposes.
       *
       * @return The labeled view id.
       */
      @IdRes
      @ViewDebug.ExportedProperty(category = "accessibility")
      @InspectableProperty
      public int getLabelFor() {
          return mLabelForId;
      }
  
      /**
       * Sets the id of a view for which this view serves as a label for
       * accessibility purposes.
       *
       * @param id The labeled view id.
       */
      @RemotableViewMethod
      public void setLabelFor(@IdRes int id) {
          if (mLabelForId == id) {
              return;
          }
          mLabelForId = id;
          if (mLabelForId != View.NO_ID
                  && mID == View.NO_ID) {
              mID = generateViewId();
          }
          notifyViewAccessibilityStateChangedIfNeeded(
                  AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
      }
  
      /**
       * Invoked whenever this view loses focus, either by losing window focus or by losing
       * focus within its window. This method can be used to clear any state tied to the
       * focus. For instance, if a button is held pressed with the trackball and the window
       * loses focus, this method can be used to cancel the press.
       *
       * Subclasses of View overriding this method should always call super.onFocusLost().
       *
       * @see #onFocusChanged(boolean, int, android.graphics.Rect)
       * @see #onWindowFocusChanged(boolean)
       *
       * @hide pending API council approval
       */
      @CallSuper
      @UnsupportedAppUsage
      protected void onFocusLost() {
          resetPressedState();
      }
  
      private void resetPressedState() {
          if ((mViewFlags & ENABLED_MASK) == DISABLED) {
              return;
          }
  
          if (isPressed()) {
              setPressed(false);
  
              if (!mHasPerformedLongPress) {
                  removeLongPressCallback();
              }
          }
      }
  
      /**
       * Returns true if this view has focus
       *
       * @return True if this view has focus, false otherwise.
       */
      @ViewDebug.ExportedProperty(category = "focus")
      @InspectableProperty(hasAttributeId = false)
      public boolean isFocused() {
          return (mPrivateFlags & PFLAG_FOCUSED) != 0;
      }
  
      /**
       * Find the view in the hierarchy rooted at this view that currently has
       * focus.
       *
       * @return The view that currently has focus, or null if no focused view can
       *         be found.
       */
      public View findFocus() {
          return (mPrivateFlags & PFLAG_FOCUSED) != 0 ? this : null;
      }
  
      /**
       * Indicates whether this view is one of the set of scrollable containers in
       * its window.
       *
       * @return whether this view is one of the set of scrollable containers in
       * its window
       *
       * @attr ref android.R.styleable#View_isScrollContainer
       */
      @InspectableProperty(name = "isScrollContainer")
      public boolean isScrollContainer() {
          return (mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0;
      }
  
      /**
       * Change whether this view is one of the set of scrollable containers in
       * its window.  This will be used to determine whether the window can
       * resize or must pan when a soft input area is open -- scrollable
       * containers allow the window to use resize mode since the container
       * will appropriately shrink.
       *
       * @attr ref android.R.styleable#View_isScrollContainer
       */
      public void setScrollContainer(boolean isScrollContainer) {
          if (isScrollContainer) {
              if (mAttachInfo != null && (mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) == 0) {
                  mAttachInfo.mScrollContainers.add(this);
                  mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED;
              }
              mPrivateFlags |= PFLAG_SCROLL_CONTAINER;
          } else {
              if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) != 0) {
                  mAttachInfo.mScrollContainers.remove(this);
              }
              mPrivateFlags &= ~(PFLAG_SCROLL_CONTAINER|PFLAG_SCROLL_CONTAINER_ADDED);
          }
      }
  
      /**
       * Returns the quality of the drawing cache.
       *
       * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO},
       *         {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH}
       *
       * @see #setDrawingCacheQuality(int)
       * @see #setDrawingCacheEnabled(boolean)
       * @see #isDrawingCacheEnabled()
       *
       * @attr ref android.R.styleable#View_drawingCacheQuality
       *
       * @deprecated The view drawing cache was largely made obsolete with the introduction of
       * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache
       * layers are largely unnecessary and can easily result in a net loss in performance due to the
       * cost of creating and updating the layer. In the rare cases where caching layers are useful,
       * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware
       * rendering. For software-rendered snapshots of a small part of the View hierarchy or
       * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or
       * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these
       * software-rendered usages are discouraged and have compatibility issues with hardware-only
       * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE}
       * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback
       * reports or unit testing the {@link PixelCopy} API is recommended.
       */
      @Deprecated
      @DrawingCacheQuality
      @InspectableProperty(enumMapping = {
              @EnumEntry(value = DRAWING_CACHE_QUALITY_LOW, name = "low"),
              @EnumEntry(value = DRAWING_CACHE_QUALITY_HIGH, name = "high"),
              @EnumEntry(value = DRAWING_CACHE_QUALITY_AUTO, name = "auto")
      })
      public int getDrawingCacheQuality() {
          return mViewFlags & DRAWING_CACHE_QUALITY_MASK;
      }
  
      /**
       * Set the drawing cache quality of this view. This value is used only when the
       * drawing cache is enabled
       *
       * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO},
       *        {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH}
       *
       * @see #getDrawingCacheQuality()
       * @see #setDrawingCacheEnabled(boolean)
       * @see #isDrawingCacheEnabled()
       *
       * @attr ref android.R.styleable#View_drawingCacheQuality
       *
       * @deprecated The view drawing cache was largely made obsolete with the introduction of
       * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache
       * layers are largely unnecessary and can easily result in a net loss in performance due to the
       * cost of creating and updating the layer. In the rare cases where caching layers are useful,
       * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware
       * rendering. For software-rendered snapshots of a small part of the View hierarchy or
       * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or
       * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these
       * software-rendered usages are discouraged and have compatibility issues with hardware-only
       * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE}
       * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback
       * reports or unit testing the {@link PixelCopy} API is recommended.
       */
      @Deprecated
      public void setDrawingCacheQuality(@DrawingCacheQuality int quality) {
          setFlags(quality, DRAWING_CACHE_QUALITY_MASK);
      }
  
      /**
       * Returns whether the screen should remain on, corresponding to the current
       * value of {@link #KEEP_SCREEN_ON}.
       *
       * @return Returns true if {@link #KEEP_SCREEN_ON} is set.
       *
       * @see #setKeepScreenOn(boolean)
       *
       * @attr ref android.R.styleable#View_keepScreenOn
       */
      @InspectableProperty
      public boolean getKeepScreenOn() {
          return (mViewFlags & KEEP_SCREEN_ON) != 0;
      }
  
      /**
       * Controls whether the screen should remain on, modifying the
       * value of {@link #KEEP_SCREEN_ON}.
       *
       * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}.
       *
       * @see #getKeepScreenOn()
       *
       * @attr ref android.R.styleable#View_keepScreenOn
       */
      public void setKeepScreenOn(boolean keepScreenOn) {
          setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON);
      }
  
      /**
       * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}.
       * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
       *
       * @attr ref android.R.styleable#View_nextFocusLeft
       */
      @IdRes
      @InspectableProperty(name = "nextFocusLeft")
      public int getNextFocusLeftId() {
          return mNextFocusLeftId;
      }
  
      /**
       * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}.
       * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should
       * decide automatically.
       *
       * @attr ref android.R.styleable#View_nextFocusLeft
       */
      public void setNextFocusLeftId(@IdRes int nextFocusLeftId) {
          mNextFocusLeftId = nextFocusLeftId;
      }
  
      /**
       * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}.
       * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
       *
       * @attr ref android.R.styleable#View_nextFocusRight
       */
      @IdRes
      @InspectableProperty(name = "nextFocusRight")
      public int getNextFocusRightId() {
          return mNextFocusRightId;
      }
  
      /**
       * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}.
       * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should
       * decide automatically.
       *
       * @attr ref android.R.styleable#View_nextFocusRight
       */
      public void setNextFocusRightId(@IdRes int nextFocusRightId) {
          mNextFocusRightId = nextFocusRightId;
      }
  
      /**
       * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}.
       * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
       *
       * @attr ref android.R.styleable#View_nextFocusUp
       */
      @IdRes
      @InspectableProperty(name = "nextFocusUp")
      public int getNextFocusUpId() {
          return mNextFocusUpId;
      }
  
      /**
       * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}.
       * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should
       * decide automatically.
       *
       * @attr ref android.R.styleable#View_nextFocusUp
       */
      public void setNextFocusUpId(@IdRes int nextFocusUpId) {
          mNextFocusUpId = nextFocusUpId;
      }
  
      /**
       * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}.
       * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
       *
       * @attr ref android.R.styleable#View_nextFocusDown
       */
      @IdRes
      @InspectableProperty(name = "nextFocusDown")
      public int getNextFocusDownId() {
          return mNextFocusDownId;
      }
  
      /**
       * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}.
       * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should
       * decide automatically.
       *
       * @attr ref android.R.styleable#View_nextFocusDown
       */
      public void setNextFocusDownId(@IdRes int nextFocusDownId) {
          mNextFocusDownId = nextFocusDownId;
      }
  
      /**
       * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}.
       * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
       *
       * @attr ref android.R.styleable#View_nextFocusForward
       */
      @IdRes
      @InspectableProperty(name = "nextFocusForward")
      public int getNextFocusForwardId() {
          return mNextFocusForwardId;
      }
  
      /**
       * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}.
       * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should
       * decide automatically.
       *
       * @attr ref android.R.styleable#View_nextFocusForward
       */
      public void setNextFocusForwardId(@IdRes int nextFocusForwardId) {
          mNextFocusForwardId = nextFocusForwardId;
      }
  
      /**
       * Gets the id of the root of the next keyboard navigation cluster.
       * @return The next keyboard navigation cluster ID, or {@link #NO_ID} if the framework should
       * decide automatically.
       *
       * @attr ref android.R.styleable#View_nextClusterForward
       */
      @IdRes
      @InspectableProperty(name = "nextClusterForward")
      public int getNextClusterForwardId() {
          return mNextClusterForwardId;
      }
  
      /**
       * Sets the id of the view to use as the root of the next keyboard navigation cluster.
       * @param nextClusterForwardId The next cluster ID, or {@link #NO_ID} if the framework should
       * decide automatically.
       *
       * @attr ref android.R.styleable#View_nextClusterForward
       */
      public void setNextClusterForwardId(@IdRes int nextClusterForwardId) {
          mNextClusterForwardId = nextClusterForwardId;
      }
  
      /**
       * Returns the visibility of this view and all of its ancestors
       *
       * @return True if this view and all of its ancestors are {@link #VISIBLE}
       */
      public boolean isShown() {
          View current = this;
          //noinspection ConstantConditions
          do {
              if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) {
                  return false;
              }
              ViewParent parent = current.mParent;
              if (parent == null) {
                  return false; // We are not attached to the view root
              }
              if (!(parent instanceof View)) {
                  return true;
              }
              current = (View) parent;
          } while (current != null);
  
          return false;
      }
  
      /**
       * Called by the view hierarchy when the content insets for a window have
       * changed, to allow it to adjust its content to fit within those windows.
       * The content insets tell you the space that the status bar, input method,
       * and other system windows infringe on the application's window.
       *
       * <p>You do not normally need to deal with this function, since the default
       * window decoration given to applications takes care of applying it to the
       * content of the window.  If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}
       * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case,
       * and your content can be placed under those system elements.  You can then
       * use this method within your view hierarchy if you have parts of your UI
       * which you would like to ensure are not being covered.
       *
       * <p>The default implementation of this method simply applies the content
       * insets to the view's padding, consuming that content (modifying the
       * insets to be 0), and returning true.  This behavior is off by default, but can
       * be enabled through {@link #setFitsSystemWindows(boolean)}.
       *
       * <p>This function's traversal down the hierarchy is depth-first.  The same content
       * insets object is propagated down the hierarchy, so any changes made to it will
       * be seen by all following views (including potentially ones above in
       * the hierarchy since this is a depth-first traversal).  The first view
       * that returns true will abort the entire traversal.
       *
       * <p>The default implementation works well for a situation where it is
       * used with a container that covers the entire window, allowing it to
       * apply the appropriate insets to its content on all edges.  If you need
       * a more complicated layout (such as two different views fitting system
       * windows, one on the top of the window, and one on the bottom),
       * you can override the method and handle the insets however you would like.
       * Note that the insets provided by the framework are always relative to the
       * far edges of the window, not accounting for the location of the called view
       * within that window.  (In fact when this method is called you do not yet know
       * where the layout will place the view, as it is done before layout happens.)
       *
       * <p>Note: unlike many View methods, there is no dispatch phase to this
       * call.  If you are overriding it in a ViewGroup and want to allow the
       * call to continue to your children, you must be sure to call the super
       * implementation.
       *
       * <p>Here is a sample layout that makes use of fitting system windows
       * to have controls for a video view placed inside of the window decorations
       * that it hides and shows.  This can be used with code like the second
       * sample (video player) shown in {@link #setSystemUiVisibility(int)}.
       *
       * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete}
       *
       * @param insets Current content insets of the window.  Prior to
       * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify
       * the insets or else you and Android will be unhappy.
       *
       * @return {@code true} if this view applied the insets and it should not
       * continue propagating further down the hierarchy, {@code false} otherwise.
       * @see #getFitsSystemWindows()
       * @see #setFitsSystemWindows(boolean)
       * @see #setSystemUiVisibility(int)
       *
       * @deprecated As of API 20 use {@link #dispatchApplyWindowInsets(WindowInsets)} to apply
       * insets to views. Views should override {@link #onApplyWindowInsets(WindowInsets)} or use
       * {@link #setOnApplyWindowInsetsListener(android.view.View.OnApplyWindowInsetsListener)}
       * to implement handling their own insets.
       */
      @Deprecated
      protected boolean fitSystemWindows(Rect insets) {
          if ((mPrivateFlags3 & PFLAG3_APPLYING_INSETS) == 0) {
              if (insets == null) {
                  // Null insets by definition have already been consumed.
                  // This call cannot apply insets since there are none to apply,
                  // so return false.
                  return false;
              }
              // If we're not in the process of dispatching the newer apply insets call,
              // that means we're not in the compatibility path. Dispatch into the newer
              // apply insets path and take things from there.
              try {
                  mPrivateFlags3 |= PFLAG3_FITTING_SYSTEM_WINDOWS;
                  return dispatchApplyWindowInsets(new WindowInsets(insets)).isConsumed();
              } finally {
                  mPrivateFlags3 &= ~PFLAG3_FITTING_SYSTEM_WINDOWS;
              }
          } else {
              // We're being called from the newer apply insets path.
              // Perform the standard fallback behavior.
              return fitSystemWindowsInt(insets);
          }
      }
  
      private boolean fitSystemWindowsInt(Rect insets) {
          if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) {
              mUserPaddingStart = UNDEFINED_PADDING;
              mUserPaddingEnd = UNDEFINED_PADDING;
              Rect localInsets = sThreadLocal.get();
              if (localInsets == null) {
                  localInsets = new Rect();
                  sThreadLocal.set(localInsets);
              }
              boolean res = computeFitSystemWindows(insets, localInsets);
              mUserPaddingLeftInitial = localInsets.left;
              mUserPaddingRightInitial = localInsets.right;
              internalSetPadding(localInsets.left, localInsets.top,
                      localInsets.right, localInsets.bottom);
              return res;
          }
          return false;
      }
  
      /**
       * Called when the view should apply {@link WindowInsets} according to its internal policy.
       *
       * <p>This method should be overridden by views that wish to apply a policy different from or
       * in addition to the default behavior. Clients that wish to force a view subtree
       * to apply insets should call {@link #dispatchApplyWindowInsets(WindowInsets)}.</p>
       *
       * <p>Clients may supply an {@link OnApplyWindowInsetsListener} to a view. If one is set
       * it will be called during dispatch instead of this method. The listener may optionally
       * call this method from its own implementation if it wishes to apply the view's default
       * insets policy in addition to its own.</p>
       *
       * <p>Implementations of this method should either return the insets parameter unchanged
       * or a new {@link WindowInsets} cloned from the supplied insets with any insets consumed
       * that this view applied itself. This allows new inset types added in future platform
       * versions to pass through existing implementations unchanged without being erroneously
       * consumed.</p>
       *
       * <p>By default if a view's {@link #setFitsSystemWindows(boolean) fitsSystemWindows}
       * property is set then the view will consume the system window insets and apply them
       * as padding for the view.</p>
       *
       * @param insets Insets to apply
       * @return The supplied insets with any applied insets consumed
       */
      public WindowInsets onApplyWindowInsets(WindowInsets insets) {
          if ((mPrivateFlags3 & PFLAG3_FITTING_SYSTEM_WINDOWS) == 0) {
              // We weren't called from within a direct call to fitSystemWindows,
              // call into it as a fallback in case we're in a class that overrides it
              // and has logic to perform.
              if (fitSystemWindows(insets.getSystemWindowInsetsAsRect())) {
                  return insets.consumeSystemWindowInsets();
              }
          } else {
              // We were called from within a direct call to fitSystemWindows.
              if (fitSystemWindowsInt(insets.getSystemWindowInsetsAsRect())) {
                  return insets.consumeSystemWindowInsets();
              }
          }
          return insets;
      }
  
      /**
       * Set an {@link OnApplyWindowInsetsListener} to take over the policy for applying
       * window insets to this view. The listener's
       * {@link OnApplyWindowInsetsListener#onApplyWindowInsets(View, WindowInsets) onApplyWindowInsets}
       * method will be called instead of the view's
       * {@link #onApplyWindowInsets(WindowInsets) onApplyWindowInsets} method.
       *
       * @param listener Listener to set
       *
       * @see #onApplyWindowInsets(WindowInsets)
       */
      public void setOnApplyWindowInsetsListener(OnApplyWindowInsetsListener listener) {
          getListenerInfo().mOnApplyWindowInsetsListener = listener;
      }
  
      /**
       * Request to apply the given window insets to this view or another view in its subtree.
       *
       * <p>This method should be called by clients wishing to apply insets corresponding to areas
       * obscured by window decorations or overlays. This can include the status and navigation bars,
       * action bars, input methods and more. New inset categories may be added in the future.
       * The method returns the insets provided minus any that were applied by this view or its
       * children.</p>
       *
       * <p>Clients wishing to provide custom behavior should override the
       * {@link #onApplyWindowInsets(WindowInsets)} method or alternatively provide a
       * {@link OnApplyWindowInsetsListener} via the
       * {@link #setOnApplyWindowInsetsListener(View.OnApplyWindowInsetsListener) setOnApplyWindowInsetsListener}
       * method.</p>
       *
       * <p>This method replaces the older {@link #fitSystemWindows(Rect) fitSystemWindows} method.
       * </p>
       *
       * @param insets Insets to apply
       * @return The provided insets minus the insets that were consumed
       */
      public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) {
          try {
              mPrivateFlags3 |= PFLAG3_APPLYING_INSETS;
              if (mListenerInfo != null && mListenerInfo.mOnApplyWindowInsetsListener != null) {
                  return mListenerInfo.mOnApplyWindowInsetsListener.onApplyWindowInsets(this, insets);
              } else {
                  return onApplyWindowInsets(insets);
              }
          } finally {
              mPrivateFlags3 &= ~PFLAG3_APPLYING_INSETS;
          }
      }
  
      /**
       * Sets a {@link WindowInsetsAnimationListener} to be notified about animations of windows that
       * cause insets.
       *
       * @param listener The listener to set.
       * @hide pending unhide
       */
      public void setWindowInsetsAnimationListener(WindowInsetsAnimationListener listener) {
          getListenerInfo().mWindowInsetsAnimationListener = listener;
      }
  
      void dispatchWindowInsetsAnimationStarted(InsetsAnimation animation) {
          if (mListenerInfo != null && mListenerInfo.mWindowInsetsAnimationListener != null) {
              mListenerInfo.mWindowInsetsAnimationListener.onStarted(animation);
          }
      }
  
      WindowInsets dispatchWindowInsetsAnimationProgress(WindowInsets insets) {
          if (mListenerInfo != null && mListenerInfo.mWindowInsetsAnimationListener != null) {
              return mListenerInfo.mWindowInsetsAnimationListener.onProgress(insets);
          } else {
              return insets;
          }
      }
  
      void dispatchWindowInsetsAnimationFinished(InsetsAnimation animation) {
          if (mListenerInfo != null && mListenerInfo.mWindowInsetsAnimationListener != null) {
              mListenerInfo.mWindowInsetsAnimationListener.onFinished(animation);
          }
      }
  
      /**
       * Sets a list of areas within this view's post-layout coordinate space where the system
       * should not intercept touch or other pointing device gestures. <em>This method should
       * be called by {@link #onLayout(boolean, int, int, int, int)} or {@link #onDraw(Canvas)}.</em>
       *
       * <p>Use this to tell the system which specific sub-areas of a view need to receive gesture
       * input in order to function correctly in the presence of global system gestures that may
       * conflict. For example, if the system wishes to capture swipe-in-from-screen-edge gestures
       * to provide system-level navigation functionality, a view such as a navigation drawer
       * container can mark the left (or starting) edge of itself as requiring gesture capture
       * priority using this API. The system may then choose to relax its own gesture recognition
       * to allow the app to consume the user's gesture. It is not necessary for an app to register
       * exclusion rects for broadly spanning regions such as the entirety of a
       * <code>ScrollView</code> or for simple press and release click targets such as
       * <code>Button</code>. Mark an exclusion rect when interacting with a view requires
       * a precision touch gesture in a small area in either the X or Y dimension, such as
       * an edge swipe or dragging a <code>SeekBar</code> thumb.</p>
       *
       * <p>Do not modify the provided list after this method is called.</p>
       *
       * <p>Note: the system will put a limit of <code>200dp</code> on the vertical extent of the
       * exclusions it takes into account. The limit does not apply while the navigation
       * bar is {@link #SYSTEM_UI_FLAG_IMMERSIVE_STICKY stickily} hidden, nor to the
       * {@link android.inputmethodservice.InputMethodService input method} and
       * {@link Intent#CATEGORY_HOME home activity}.
       * </p>
       *
       * @param rects A list of precision gesture regions that this view needs to function correctly
       */
      public void setSystemGestureExclusionRects(@NonNull List<Rect> rects) {
          if (rects.isEmpty() && mListenerInfo == null) return;
  
          final ListenerInfo info = getListenerInfo();
          if (rects.isEmpty()) {
              info.mSystemGestureExclusionRects = null;
              if (info.mPositionUpdateListener != null) {
                  mRenderNode.removePositionUpdateListener(info.mPositionUpdateListener);
              }
          } else {
              info.mSystemGestureExclusionRects = rects;
              if (info.mPositionUpdateListener == null) {
                  info.mPositionUpdateListener = new RenderNode.PositionUpdateListener() {
                      @Override
                      public void positionChanged(long n, int l, int t, int r, int b) {
                          postUpdateSystemGestureExclusionRects();
                      }
  
                      @Override
                      public void positionLost(long frameNumber) {
                          postUpdateSystemGestureExclusionRects();
                      }
                  };
                  mRenderNode.addPositionUpdateListener(info.mPositionUpdateListener);
              }
          }
          postUpdateSystemGestureExclusionRects();
      }
  
      /**
       * WARNING: this can be called by a hwui worker thread, not just the UI thread!
       */
      void postUpdateSystemGestureExclusionRects() {
          // Potentially racey from a background thread. It's ok if it's not perfect.
          final Handler h = getHandler();
          if (h != null) {
              h.postAtFrontOfQueue(this::updateSystemGestureExclusionRects);
          }
      }
  
      void updateSystemGestureExclusionRects() {
          final AttachInfo ai = mAttachInfo;
          if (ai != null) {
              ai.mViewRootImpl.updateSystemGestureExclusionRectsForView(this);
          }
      }
  
      /**
       * Retrieve the list of areas within this view's post-layout coordinate space where the system
       * should not intercept touch or other pointing device gestures.
       *
       * <p>Do not modify the returned list.</p>
       *
       * @return the list set by {@link #setSystemGestureExclusionRects(List)}
       */
      @NonNull
      public List<Rect> getSystemGestureExclusionRects() {
          final ListenerInfo info = mListenerInfo;
          if (info != null) {
              final List<Rect> list = info.mSystemGestureExclusionRects;
              if (list != null) {
                  return list;
              }
          }
          return Collections.emptyList();
      }
  
      /**
       * Compute the view's coordinate within the surface.
       *
       * <p>Computes the coordinates of this view in its surface. The argument
       * must be an array of two integers. After the method returns, the array
       * contains the x and y location in that order.</p>
       *
       * @param location an array of two integers in which to hold the coordinates
       */
      public void getLocationInSurface(@NonNull @Size(2) int[] location) {
          getLocationInWindow(location);
          if (mAttachInfo != null && mAttachInfo.mViewRootImpl != null) {
              location[0] += mAttachInfo.mViewRootImpl.mWindowAttributes.surfaceInsets.left;
              location[1] += mAttachInfo.mViewRootImpl.mWindowAttributes.surfaceInsets.top;
          }
      }
  
      /**
       * Provide original WindowInsets that are dispatched to the view hierarchy. The insets are
       * only available if the view is attached.
       *
       * @return WindowInsets from the top of the view hierarchy or null if View is detached
       */
      public WindowInsets getRootWindowInsets() {
          if (mAttachInfo != null) {
              return mAttachInfo.mViewRootImpl.getWindowInsets(false /* forceConstruct */);
          }
          return null;
      }
  
      /**
       * Retrieves the single {@link WindowInsetsController} of the window this view is attached to.
       *
       * @return The {@link WindowInsetsController} or {@code null} if the view isn't attached to a
       *         a window.
       * @see Window#getInsetsController()
       * @hide pending unhide
       */
      public @Nullable WindowInsetsController getWindowInsetsController() {
          if (mAttachInfo != null) {
              return mAttachInfo.mViewRootImpl.getInsetsController();
          }
          return null;
      }
  
      /**
       * @hide Compute the insets that should be consumed by this view and the ones
       * that should propagate to those under it.
       *
       * Note: This is used by appcompat's ActionBarOverlayLayout through reflection.
       *
       * @param inoutInsets the insets given to this view
       * @param outLocalInsets the insets that should be applied to this view
       * @deprecated use {@link #computeSystemWindowInsets}
       * @return
       */
      @Deprecated
      @UnsupportedAppUsage
      protected boolean computeFitSystemWindows(Rect inoutInsets, Rect outLocalInsets) {
          WindowInsets innerInsets = computeSystemWindowInsets(new WindowInsets(inoutInsets),
                  outLocalInsets);
          inoutInsets.set(innerInsets.getSystemWindowInsetsAsRect());
          return innerInsets.isSystemWindowInsetsConsumed();
      }
  
      /**
       * Compute insets that should be consumed by this view and the ones that should propagate
       * to those under it.
       *
       * @param in Insets currently being processed by this View, likely received as a parameter
       *           to {@link #onApplyWindowInsets(WindowInsets)}.
       * @param outLocalInsets A Rect that will receive the insets that should be consumed
       *                       by this view
       * @return Insets that should be passed along to views under this one
       */
      public WindowInsets computeSystemWindowInsets(WindowInsets in, Rect outLocalInsets) {
          if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0
                  || mAttachInfo == null
                  || ((mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0
                  && !mAttachInfo.mOverscanRequested)) {
              outLocalInsets.set(in.getSystemWindowInsetsAsRect());
              return in.consumeSystemWindowInsets().inset(outLocalInsets);
          } else {
              // The application wants to take care of fitting system window for
              // the content...  however we still need to take care of any overscan here.
              final Rect overscan = mAttachInfo.mOverscanInsets;
              outLocalInsets.set(overscan);
              return in.inset(outLocalInsets);
          }
      }
  
      /**
       * Sets whether or not this view should account for system screen decorations
       * such as the status bar and inset its content; that is, controlling whether
       * the default implementation of {@link #fitSystemWindows(Rect)} will be
       * executed.  See that method for more details.
       *
       * <p>Note that if you are providing your own implementation of
       * {@link #fitSystemWindows(Rect)}, then there is no need to set this
       * flag to true -- your implementation will be overriding the default
       * implementation that checks this flag.
       *
       * @param fitSystemWindows If true, then the default implementation of
       * {@link #fitSystemWindows(Rect)} will be executed.
       *
       * @attr ref android.R.styleable#View_fitsSystemWindows
       * @see #getFitsSystemWindows()
       * @see #fitSystemWindows(Rect)
       * @see #setSystemUiVisibility(int)
       */
      public void setFitsSystemWindows(boolean fitSystemWindows) {
          setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS);
      }
  
      /**
       * Check for state of {@link #setFitsSystemWindows(boolean)}. If this method
       * returns {@code true}, the default implementation of {@link #fitSystemWindows(Rect)}
       * will be executed.
       *
       * @return {@code true} if the default implementation of
       * {@link #fitSystemWindows(Rect)} will be executed.
       *
       * @attr ref android.R.styleable#View_fitsSystemWindows
       * @see #setFitsSystemWindows(boolean)
       * @see #fitSystemWindows(Rect)
       * @see #setSystemUiVisibility(int)
       */
      @ViewDebug.ExportedProperty
      @InspectableProperty
      public boolean getFitsSystemWindows() {
          return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS;
      }
  
      /** @hide */
      @UnsupportedAppUsage
      public boolean fitsSystemWindows() {
          return getFitsSystemWindows();
      }
  
      /**
       * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed.
       * @deprecated Use {@link #requestApplyInsets()} for newer platform versions.
       */
      @Deprecated
      public void requestFitSystemWindows() {
          if (mParent != null) {
              mParent.requestFitSystemWindows();
          }
      }
  
      /**
       * Ask that a new dispatch of {@link #onApplyWindowInsets(WindowInsets)} be performed.
       */
      public void requestApplyInsets() {
          requestFitSystemWindows();
      }
  
      /**
       * For use by PhoneWindow to make its own system window fitting optional.
       * @hide
       */
      @UnsupportedAppUsage
      public void makeOptionalFitsSystemWindows() {
          setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS);
      }
  
      /**
       * Returns the outsets, which areas of the device that aren't a surface, but we would like to
       * treat them as such.
       * @hide
       */
      public void getOutsets(Rect outOutsetRect) {
          if (mAttachInfo != null) {
              outOutsetRect.set(mAttachInfo.mOutsets);
          } else {
              outOutsetRect.setEmpty();
          }
      }
  
      /**
       * Returns the visibility status for this view.
       *
       * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}.
       * @attr ref android.R.styleable#View_visibility
       */
      @ViewDebug.ExportedProperty(mapping = {
          @ViewDebug.IntToString(from = VISIBLE,   to = "VISIBLE"),
          @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"),
          @ViewDebug.IntToString(from = GONE,      to = "GONE")
      })
      @InspectableProperty(enumMapping = {
              @EnumEntry(value = VISIBLE, name = "visible"),
              @EnumEntry(value = INVISIBLE, name = "invisible"),
              @EnumEntry(value = GONE, name = "gone")
      })
      @Visibility
      public int getVisibility() {
          return mViewFlags & VISIBILITY_MASK;
      }
  
      /**
       * Set the visibility state of this view.
       *
       * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}.
       * @attr ref android.R.styleable#View_visibility
       */
      @RemotableViewMethod
      public void setVisibility(@Visibility int visibility) {
          setFlags(visibility, VISIBILITY_MASK);
      }
  
      /**
       * Returns the enabled status for this view. The interpretation of the
       * enabled state varies by subclass.
       *
       * @return True if this view is enabled, false otherwise.
       */
      @ViewDebug.ExportedProperty
      @InspectableProperty
      public boolean isEnabled() {
          return (mViewFlags & ENABLED_MASK) == ENABLED;
      }
  
      /**
       * Set the enabled state of this view. The interpretation of the enabled
       * state varies by subclass.
       *
       * @param enabled True if this view is enabled, false otherwise.
       */
      @RemotableViewMethod
      public void setEnabled(boolean enabled) {
          if (enabled == isEnabled()) return;
  
          setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK);
  
          /*
           * The View most likely has to change its appearance, so refresh
           * the drawable state.
           */
          refreshDrawableState();
  
          // Invalidate too, since the default behavior for views is to be
          // be drawn at 50% alpha rather than to change the drawable.
          invalidate(true);
  
          if (!enabled) {
              cancelPendingInputEvents();
          }
      }
  
      /**
       * Set whether this view can receive the focus.
       * <p>
       * Setting this to false will also ensure that this view is not focusable
       * in touch mode.
       *
       * @param focusable If true, this view can receive the focus.
       *
       * @see #setFocusableInTouchMode(boolean)
       * @see #setFocusable(int)
       * @attr ref android.R.styleable#View_focusable
       */
      public void setFocusable(boolean focusable) {
          setFocusable(focusable ? FOCUSABLE : NOT_FOCUSABLE);
      }
  
      /**
       * Sets whether this view can receive focus.
       * <p>
       * Setting this to {@link #FOCUSABLE_AUTO} tells the framework to determine focusability
       * automatically based on the view's interactivity. This is the default.
       * <p>
       * Setting this to NOT_FOCUSABLE will ensure that this view is also not focusable
       * in touch mode.
       *
       * @param focusable One of {@link #NOT_FOCUSABLE}, {@link #FOCUSABLE},
       *                  or {@link #FOCUSABLE_AUTO}.
       * @see #setFocusableInTouchMode(boolean)
       * @attr ref android.R.styleable#View_focusable
       */
      public void setFocusable(@Focusable int focusable) {
          if ((focusable & (FOCUSABLE_AUTO | FOCUSABLE)) == 0) {
              setFlags(0, FOCUSABLE_IN_TOUCH_MODE);
          }
          setFlags(focusable, FOCUSABLE_MASK);
      }
  
      /**
       * Set whether this view can receive focus while in touch mode.
       *
       * Setting this to true will also ensure that this view is focusable.
       *
       * @param focusableInTouchMode If true, this view can receive the focus while
       *   in touch mode.
       *
       * @see #setFocusable(boolean)
       * @attr ref android.R.styleable#View_focusableInTouchMode
       */
      public void setFocusableInTouchMode(boolean focusableInTouchMode) {
          // Focusable in touch mode should always be set before the focusable flag
          // otherwise, setting the focusable flag will trigger a focusableViewAvailable()
          // which, in touch mode, will not successfully request focus on this view
          // because the focusable in touch mode flag is not set
          setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE);
  
          // Clear FOCUSABLE_AUTO if set.
          if (focusableInTouchMode) {
              // Clears FOCUSABLE_AUTO if set.
              setFlags(FOCUSABLE, FOCUSABLE_MASK);
          }
      }
  
      /**
       * Sets the hints that help an {@link android.service.autofill.AutofillService} determine how
       * to autofill the view with the user's data.
       *
       * <p>Typically, there is only one way to autofill a view, but there could be more than one.
       * For example, if the application accepts either an username or email address to identify
       * an user.
       *
       * <p>These hints are not validated by the Android System, but passed "as is" to the service.
       * Hence, they can have any value, but it's recommended to use the {@code AUTOFILL_HINT_}
       * constants such as:
       * {@link #AUTOFILL_HINT_USERNAME}, {@link #AUTOFILL_HINT_PASSWORD},
       * {@link #AUTOFILL_HINT_EMAIL_ADDRESS},
       * {@link #AUTOFILL_HINT_NAME},
       * {@link #AUTOFILL_HINT_PHONE},
       * {@link #AUTOFILL_HINT_POSTAL_ADDRESS}, {@link #AUTOFILL_HINT_POSTAL_CODE},
       * {@link #AUTOFILL_HINT_CREDIT_CARD_NUMBER}, {@link #AUTOFILL_HINT_CREDIT_CARD_SECURITY_CODE},
       * {@link #AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DATE},
       * {@link #AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DAY},
       * {@link #AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_MONTH} or
       * {@link #AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_YEAR}.
       *
       * @param autofillHints The autofill hints to set. If the array is emtpy, {@code null} is set.
       * @attr ref android.R.styleable#View_autofillHints
       */
      public void setAutofillHints(@Nullable String... autofillHints) {
          if (autofillHints == null || autofillHints.length == 0) {
              mAutofillHints = null;
          } else {
              mAutofillHints = autofillHints;
          }
      }
  
      /**
       * @hide
       */
      @TestApi
      public void setAutofilled(boolean isAutofilled) {
          boolean wasChanged = isAutofilled != isAutofilled();
  
          if (wasChanged) {
              if (isAutofilled) {
                  mPrivateFlags3 |= PFLAG3_IS_AUTOFILLED;
              } else {
                  mPrivateFlags3 &= ~PFLAG3_IS_AUTOFILLED;
              }
  
              invalidate();
          }
      }
  
      /**
       * Set whether this view should have sound effects enabled for events such as
       * clicking and touching.
       *
       * <p>You may wish to disable sound effects for a view if you already play sounds,
       * for instance, a dial key that plays dtmf tones.
       *
       * @param soundEffectsEnabled whether sound effects are enabled for this view.
       * @see #isSoundEffectsEnabled()
       * @see #playSoundEffect(int)
       * @attr ref android.R.styleable#View_soundEffectsEnabled
       */
      public void setSoundEffectsEnabled(boolean soundEffectsEnabled) {
          setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED);
      }
  
      /**
       * @return whether this view should have sound effects enabled for events such as
       *     clicking and touching.
       *
       * @see #setSoundEffectsEnabled(boolean)
       * @see #playSoundEffect(int)
       * @attr ref android.R.styleable#View_soundEffectsEnabled
       */
      @ViewDebug.ExportedProperty
      @InspectableProperty
      public boolean isSoundEffectsEnabled() {
          return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED);
      }
  
      /**
       * Set whether this view should have haptic feedback for events such as
       * long presses.
       *
       * <p>You may wish to disable haptic feedback if your view already controls
       * its own haptic feedback.
       *
       * @param hapticFeedbackEnabled whether haptic feedback enabled for this view.
       * @see #isHapticFeedbackEnabled()
       * @see #performHapticFeedback(int)
       * @attr ref android.R.styleable#View_hapticFeedbackEnabled
       */
      public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) {
          setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED);
      }
  
      /**
       * @return whether this view should have haptic feedback enabled for events
       * long presses.
       *
       * @see #setHapticFeedbackEnabled(boolean)
       * @see #performHapticFeedback(int)
       * @attr ref android.R.styleable#View_hapticFeedbackEnabled
       */
      @ViewDebug.ExportedProperty
      @InspectableProperty
      public boolean isHapticFeedbackEnabled() {
          return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED);
      }
  
      /**
       * Returns the layout direction for this view.
       *
       * @return One of {@link #LAYOUT_DIRECTION_LTR},
       *   {@link #LAYOUT_DIRECTION_RTL},
       *   {@link #LAYOUT_DIRECTION_INHERIT} or
       *   {@link #LAYOUT_DIRECTION_LOCALE}.
       *
       * @attr ref android.R.styleable#View_layoutDirection
       *
       * @hide
       */
      @ViewDebug.ExportedProperty(category = "layout", mapping = {
          @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR,     to = "LTR"),
          @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL,     to = "RTL"),
          @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"),
          @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE,  to = "LOCALE")
      })
      @InspectableProperty(hasAttributeId = false, enumMapping = {
              @EnumEntry(value = LAYOUT_DIRECTION_LTR, name = "ltr"),
              @EnumEntry(value = LAYOUT_DIRECTION_RTL, name = "rtl"),
              @EnumEntry(value = LAYOUT_DIRECTION_INHERIT, name = "inherit"),
              @EnumEntry(value = LAYOUT_DIRECTION_LOCALE, name = "locale")
      })
      @LayoutDir
      public int getRawLayoutDirection() {
          return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;
      }
  
      /**
       * Set the layout direction for this view. This will propagate a reset of layout direction
       * resolution to the view's children and resolve layout direction for this view.
       *
       * @param layoutDirection the layout direction to set. Should be one of:
       *
       * {@link #LAYOUT_DIRECTION_LTR},
       * {@link #LAYOUT_DIRECTION_RTL},
       * {@link #LAYOUT_DIRECTION_INHERIT},
       * {@link #LAYOUT_DIRECTION_LOCALE}.
       *
       * Resolution will be done if the value is set to LAYOUT_DIRECTION_INHERIT. The resolution
       * proceeds up the parent chain of the view to get the value. If there is no parent, then it
       * will return the default {@link #LAYOUT_DIRECTION_LTR}.
       *
       * @attr ref android.R.styleable#View_layoutDirection
       */
      @RemotableViewMethod
      public void setLayoutDirection(@LayoutDir int layoutDirection) {
          if (getRawLayoutDirection() != layoutDirection) {
              // Reset the current layout direction and the resolved one
              mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_MASK;
              resetRtlProperties();
              // Set the new layout direction (filtered)
              mPrivateFlags2 |=
                      ((layoutDirection << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) & PFLAG2_LAYOUT_DIRECTION_MASK);
              // We need to resolve all RTL properties as they all depend on layout direction
              resolveRtlPropertiesIfNeeded();
              requestLayout();
              invalidate(true);
          }
      }
  
      /**
       * Returns the resolved layout direction for this view.
       *
       * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns
       * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL.
       *
       * For compatibility, this will return {@link #LAYOUT_DIRECTION_LTR} if API version
       * is lower than {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}.
       *
       * @attr ref android.R.styleable#View_layoutDirection
       */
      @ViewDebug.ExportedProperty(category = "layout", mapping = {
          @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"),
          @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL")
      })
      @InspectableProperty(enumMapping = {
              @EnumEntry(value = LAYOUT_DIRECTION_LTR, name = "ltr"),
              @EnumEntry(value = LAYOUT_DIRECTION_RTL, name = "rtl")
      })
      @ResolvedLayoutDir
      public int getLayoutDirection() {
          final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion;
          if (targetSdkVersion < Build.VERSION_CODES.JELLY_BEAN_MR1) {
              mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED;
              return LAYOUT_DIRECTION_RESOLVED_DEFAULT;
          }
          return ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ==
                  PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ? LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR;
      }
  
      /**
       * Indicates whether or not this view's layout is right-to-left. This is resolved from
       * layout attribute and/or the inherited value from the parent
       *
       * @return true if the layout is right-to-left.
       *
       * @hide
       */
      @ViewDebug.ExportedProperty(category = "layout")
      @UnsupportedAppUsage
      public boolean isLayoutRtl() {
          return (getLayoutDirection() == LAYOUT_DIRECTION_RTL);
      }
  
      /**
       * Indicates whether the view is currently tracking transient state that the
       * app should not need to concern itself with saving and restoring, but that
       * the framework should take special note to preserve when possible.
       *
       * <p>A view with transient state cannot be trivially rebound from an external
       * data source, such as an adapter binding item views in a list. This may be
       * because the view is performing an animation, tracking user selection
       * of content, or similar.</p>
       *
       * @return true if the view has transient state
       */
      @ViewDebug.ExportedProperty(category = "layout")
      public boolean hasTransientState() {
          return (mPrivateFlags2 & PFLAG2_HAS_TRANSIENT_STATE) == PFLAG2_HAS_TRANSIENT_STATE;
      }
  
      /**
       * Set whether this view is currently tracking transient state that the
       * framework should attempt to preserve when possible. This flag is reference counted,
       * so every call to setHasTransientState(true) should be paired with a later call
       * to setHasTransientState(false).
       *
       * <p>A view with transient state cannot be trivially rebound from an external
       * data source, such as an adapter binding item views in a list. This may be
       * because the view is performing an animation, tracking user selection
       * of content, or similar.</p>
       *
       * @param hasTransientState true if this view has transient state
       */
      public void setHasTransientState(boolean hasTransientState) {
          final boolean oldHasTransientState = hasTransientState();
          mTransientStateCount = hasTransientState ? mTransientStateCount + 1 :
                  mTransientStateCount - 1;
          if (mTransientStateCount < 0) {
              mTransientStateCount = 0;
              Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " +
                      "unmatched pair of setHasTransientState calls");
          } else if ((hasTransientState && mTransientStateCount == 1) ||
                  (!hasTransientState && mTransientStateCount == 0)) {
              // update flag if we've just incremented up from 0 or decremented down to 0
              mPrivateFlags2 = (mPrivateFlags2 & ~PFLAG2_HAS_TRANSIENT_STATE) |
                      (hasTransientState ? PFLAG2_HAS_TRANSIENT_STATE : 0);
              final boolean newHasTransientState = hasTransientState();
              if (mParent != null && newHasTransientState != oldHasTransientState) {
                  try {
                      mParent.childHasTransientStateChanged(this, newHasTransientState);
                  } catch (AbstractMethodError e) {
                      Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
                              " does not fully implement ViewParent", e);
                  }
              }
          }
      }
  
      /**
       * Returns true if this view is currently attached to a window.
       */
      public boolean isAttachedToWindow() {
          return mAttachInfo != null;
      }
  
      /**
       * Returns true if this view has been through at least one layout since it
       * was last attached to or detached from a window.
       */
      public boolean isLaidOut() {
          return (mPrivateFlags3 & PFLAG3_IS_LAID_OUT) == PFLAG3_IS_LAID_OUT;
      }
  
      /**
       * @return {@code true} if laid-out and not about to do another layout.
       */
      boolean isLayoutValid() {
          return isLaidOut() && ((mPrivateFlags & PFLAG_FORCE_LAYOUT) == 0);
      }
  
      /**
       * If this view doesn't do any drawing on its own, set this flag to
       * allow further optimizations. By default, this flag is not set on
       * View, but could be set on some View subclasses such as ViewGroup.
       *
       * Typically, if you override {@link #onDraw(android.graphics.Canvas)}
       * you should clear this flag.
       *
       * @param willNotDraw whether or not this View draw on its own
       */
      public void setWillNotDraw(boolean willNotDraw) {
          setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK);
      }
  
      /**
       * Returns whether or not this View draws on its own.
       *
       * @return true if this view has nothing to draw, false otherwise
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      public boolean willNotDraw() {
          return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW;
      }
  
      /**
       * When a View's drawing cache is enabled, drawing is redirected to an
       * offscreen bitmap. Some views, like an ImageView, must be able to
       * bypass this mechanism if they already draw a single bitmap, to avoid
       * unnecessary usage of the memory.
       *
       * @param willNotCacheDrawing true if this view does not cache its
       *        drawing, false otherwise
       *
       * @deprecated The view drawing cache was largely made obsolete with the introduction of
       * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache
       * layers are largely unnecessary and can easily result in a net loss in performance due to the
       * cost of creating and updating the layer. In the rare cases where caching layers are useful,
       * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware
       * rendering. For software-rendered snapshots of a small part of the View hierarchy or
       * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or
       * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these
       * software-rendered usages are discouraged and have compatibility issues with hardware-only
       * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE}
       * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback
       * reports or unit testing the {@link PixelCopy} API is recommended.
       */
      @Deprecated
      public void setWillNotCacheDrawing(boolean willNotCacheDrawing) {
          setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING);
      }
  
      /**
       * Returns whether or not this View can cache its drawing or not.
       *
       * @return true if this view does not cache its drawing, false otherwise
       *
       * @deprecated The view drawing cache was largely made obsolete with the introduction of
       * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache
       * layers are largely unnecessary and can easily result in a net loss in performance due to the
       * cost of creating and updating the layer. In the rare cases where caching layers are useful,
       * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware
       * rendering. For software-rendered snapshots of a small part of the View hierarchy or
       * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or
       * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these
       * software-rendered usages are discouraged and have compatibility issues with hardware-only
       * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE}
       * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback
       * reports or unit testing the {@link PixelCopy} API is recommended.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      @Deprecated
      public boolean willNotCacheDrawing() {
          return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING;
      }
  
      /**
       * Indicates whether this view reacts to click events or not.
       *
       * @return true if the view is clickable, false otherwise
       *
       * @see #setClickable(boolean)
       * @attr ref android.R.styleable#View_clickable
       */
      @ViewDebug.ExportedProperty
      @InspectableProperty
      public boolean isClickable() {
          return (mViewFlags & CLICKABLE) == CLICKABLE;
      }
  
      /**
       * Enables or disables click events for this view. When a view
       * is clickable it will change its state to "pressed" on every click.
       * Subclasses should set the view clickable to visually react to
       * user's clicks.
       *
       * @param clickable true to make the view clickable, false otherwise
       *
       * @see #isClickable()
       * @attr ref android.R.styleable#View_clickable
       */
      public void setClickable(boolean clickable) {
          setFlags(clickable ? CLICKABLE : 0, CLICKABLE);
      }
  
      /**
       * Indicates whether this view reacts to long click events or not.
       *
       * @return true if the view is long clickable, false otherwise
       *
       * @see #setLongClickable(boolean)
       * @attr ref android.R.styleable#View_longClickable
       */
      @InspectableProperty
      public boolean isLongClickable() {
          return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE;
      }
  
      /**
       * Enables or disables long click events for this view. When a view is long
       * clickable it reacts to the user holding down the button for a longer
       * duration than a tap. This event can either launch the listener or a
       * context menu.
       *
       * @param longClickable true to make the view long clickable, false otherwise
       * @see #isLongClickable()
       * @attr ref android.R.styleable#View_longClickable
       */
      public void setLongClickable(boolean longClickable) {
          setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE);
      }
  
      /**
       * Indicates whether this view reacts to context clicks or not.
       *
       * @return true if the view is context clickable, false otherwise
       * @see #setContextClickable(boolean)
       * @attr ref android.R.styleable#View_contextClickable
       */
      @InspectableProperty
      public boolean isContextClickable() {
          return (mViewFlags & CONTEXT_CLICKABLE) == CONTEXT_CLICKABLE;
      }
  
      /**
       * Enables or disables context clicking for this view. This event can launch the listener.
       *
       * @param contextClickable true to make the view react to a context click, false otherwise
       * @see #isContextClickable()
       * @attr ref android.R.styleable#View_contextClickable
       */
      public void setContextClickable(boolean contextClickable) {
          setFlags(contextClickable ? CONTEXT_CLICKABLE : 0, CONTEXT_CLICKABLE);
      }
  
      /**
       * Sets the pressed state for this view and provides a touch coordinate for
       * animation hinting.
       *
       * @param pressed Pass true to set the View's internal state to "pressed",
       *            or false to reverts the View's internal state from a
       *            previously set "pressed" state.
       * @param x The x coordinate of the touch that caused the press
       * @param y The y coordinate of the touch that caused the press
       */
      private void setPressed(boolean pressed, float x, float y) {
          if (pressed) {
              drawableHotspotChanged(x, y);
          }
  
          setPressed(pressed);
      }
  
      /**
       * Sets the pressed state for this view.
       *
       * @see #isClickable()
       * @see #setClickable(boolean)
       *
       * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts
       *        the View's internal state from a previously set "pressed" state.
       */
      public void setPressed(boolean pressed) {
          final boolean needsRefresh = pressed != ((mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED);
  
          if (pressed) {
              mPrivateFlags |= PFLAG_PRESSED;
          } else {
              mPrivateFlags &= ~PFLAG_PRESSED;
          }
  
          if (needsRefresh) {
              refreshDrawableState();
          }
          dispatchSetPressed(pressed);
      }
  
      /**
       * Dispatch setPressed to all of this View's children.
       *
       * @see #setPressed(boolean)
       *
       * @param pressed The new pressed state
       */
      protected void dispatchSetPressed(boolean pressed) {
      }
  
      /**
       * Indicates whether the view is currently in pressed state. Unless
       * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter
       * the pressed state.
       *
       * @see #setPressed(boolean)
       * @see #isClickable()
       * @see #setClickable(boolean)
       *
       * @return true if the view is currently pressed, false otherwise
       */
      @ViewDebug.ExportedProperty
      @InspectableProperty(hasAttributeId = false)
      public boolean isPressed() {
          return (mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED;
      }
  
      /**
       * @hide
       * Indicates whether this view will participate in data collection through
       * {@link ViewStructure}.  If true, it will not provide any data
       * for itself or its children.  If false, the normal data collection will be allowed.
       *
       * @return Returns false if assist data collection is not blocked, else true.
       *
       * @see #setAssistBlocked(boolean)
       * @attr ref android.R.styleable#View_assistBlocked
       */
      public boolean isAssistBlocked() {
          return (mPrivateFlags3 & PFLAG3_ASSIST_BLOCKED) != 0;
      }
  
      /**
       * @hide
       * Controls whether assist data collection from this view and its children is enabled
       * (that is, whether {@link #onProvideStructure} and
       * {@link #onProvideVirtualStructure} will be called).  The default value is false,
       * allowing normal assist collection.  Setting this to false will disable assist collection.
       *
       * @param enabled Set to true to <em>disable</em> assist data collection, or false
       * (the default) to allow it.
       *
       * @see #isAssistBlocked()
       * @see #onProvideStructure
       * @see #onProvideVirtualStructure
       * @attr ref android.R.styleable#View_assistBlocked
       */
      @UnsupportedAppUsage
      public void setAssistBlocked(boolean enabled) {
          if (enabled) {
              mPrivateFlags3 |= PFLAG3_ASSIST_BLOCKED;
          } else {
              mPrivateFlags3 &= ~PFLAG3_ASSIST_BLOCKED;
          }
      }
  
      /**
       * Indicates whether this view will save its state (that is,
       * whether its {@link #onSaveInstanceState} method will be called).
       *
       * @return Returns true if the view state saving is enabled, else false.
       *
       * @see #setSaveEnabled(boolean)
       * @attr ref android.R.styleable#View_saveEnabled
       */
      @InspectableProperty
      public boolean isSaveEnabled() {
          return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED;
      }
  
      /**
       * Controls whether the saving of this view's state is
       * enabled (that is, whether its {@link #onSaveInstanceState} method
       * will be called).  Note that even if freezing is enabled, the
       * view still must have an id assigned to it (via {@link #setId(int)})
       * for its state to be saved.  This flag can only disable the
       * saving of this view; any child views may still have their state saved.
       *
       * @param enabled Set to false to <em>disable</em> state saving, or true
       * (the default) to allow it.
       *
       * @see #isSaveEnabled()
       * @see #setId(int)
       * @see #onSaveInstanceState()
       * @attr ref android.R.styleable#View_saveEnabled
       */
      public void setSaveEnabled(boolean enabled) {
          setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK);
      }
  
      /**
       * Gets whether the framework should discard touches when the view's
       * window is obscured by another visible window.
       * Refer to the {@link View} security documentation for more details.
       *
       * @return True if touch filtering is enabled.
       *
       * @see #setFilterTouchesWhenObscured(boolean)
       * @attr ref android.R.styleable#View_filterTouchesWhenObscured
       */
      @ViewDebug.ExportedProperty
      @InspectableProperty
      public boolean getFilterTouchesWhenObscured() {
          return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0;
      }
  
      /**
       * Sets whether the framework should discard touches when the view's
       * window is obscured by another visible window.
       * Refer to the {@link View} security documentation for more details.
       *
       * @param enabled True if touch filtering should be enabled.
       *
       * @see #getFilterTouchesWhenObscured
       * @attr ref android.R.styleable#View_filterTouchesWhenObscured
       */
      public void setFilterTouchesWhenObscured(boolean enabled) {
          setFlags(enabled ? FILTER_TOUCHES_WHEN_OBSCURED : 0,
                  FILTER_TOUCHES_WHEN_OBSCURED);
      }
  
      /**
       * Indicates whether the entire hierarchy under this view will save its
       * state when a state saving traversal occurs from its parent.  The default
       * is true; if false, these views will not be saved unless
       * {@link #saveHierarchyState(SparseArray)} is called directly on this view.
       *
       * @return Returns true if the view state saving from parent is enabled, else false.
       *
       * @see #setSaveFromParentEnabled(boolean)
       */
      public boolean isSaveFromParentEnabled() {
          return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED;
      }
  
      /**
       * Controls whether the entire hierarchy under this view will save its
       * state when a state saving traversal occurs from its parent.  The default
       * is true; if false, these views will not be saved unless
       * {@link #saveHierarchyState(SparseArray)} is called directly on this view.
       *
       * @param enabled Set to false to <em>disable</em> state saving, or true
       * (the default) to allow it.
       *
       * @see #isSaveFromParentEnabled()
       * @see #setId(int)
       * @see #onSaveInstanceState()
       */
      public void setSaveFromParentEnabled(boolean enabled) {
          setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK);
      }
  
  
      /**
       * Returns whether this View is currently able to take focus.
       *
       * @return True if this view can take focus, or false otherwise.
       */
      @ViewDebug.ExportedProperty(category = "focus")
      public final boolean isFocusable() {
          return FOCUSABLE == (mViewFlags & FOCUSABLE);
      }
  
      /**
       * Returns the focusable setting for this view.
       *
       * @return One of {@link #NOT_FOCUSABLE}, {@link #FOCUSABLE}, or {@link #FOCUSABLE_AUTO}.
       * @attr ref android.R.styleable#View_focusable
       */
      @ViewDebug.ExportedProperty(mapping = {
              @ViewDebug.IntToString(from = NOT_FOCUSABLE, to = "NOT_FOCUSABLE"),
              @ViewDebug.IntToString(from = FOCUSABLE, to = "FOCUSABLE"),
              @ViewDebug.IntToString(from = FOCUSABLE_AUTO, to = "FOCUSABLE_AUTO")
              }, category = "focus")
      @InspectableProperty(enumMapping = {
              @EnumEntry(value = NOT_FOCUSABLE, name = "false"),
              @EnumEntry(value = FOCUSABLE, name = "true"),
              @EnumEntry(value = FOCUSABLE_AUTO, name = "auto")
      })
      @Focusable
      public int getFocusable() {
          return (mViewFlags & FOCUSABLE_AUTO) > 0 ? FOCUSABLE_AUTO : mViewFlags & FOCUSABLE;
      }
  
      /**
       * When a view is focusable, it may not want to take focus when in touch mode.
       * For example, a button would like focus when the user is navigating via a D-pad
       * so that the user can click on it, but once the user starts touching the screen,
       * the button shouldn't take focus
       * @return Whether the view is focusable in touch mode.
       * @attr ref android.R.styleable#View_focusableInTouchMode
       */
      @ViewDebug.ExportedProperty(category = "focus")
      @InspectableProperty
      public final boolean isFocusableInTouchMode() {
          return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE);
      }
  
      /**
       * Returns whether the view should be treated as a focusable unit by screen reader
       * accessibility tools.
       * @see #setScreenReaderFocusable(boolean)
       *
       * @return Whether the view should be treated as a focusable unit by screen reader.
       *
       * @attr ref android.R.styleable#View_screenReaderFocusable
       */
      @InspectableProperty
      public boolean isScreenReaderFocusable() {
          return (mPrivateFlags3 & PFLAG3_SCREEN_READER_FOCUSABLE) != 0;
      }
  
      /**
       * Sets whether this View should be a focusable element for screen readers
       * and include non-focusable Views from its subtree when providing feedback.
       * <p>
       * Note: this is similar to using <a href="#attr_android:focusable">{@code android:focusable},
       * but does not impact input focus behavior.
       *
       * @param screenReaderFocusable Whether the view should be treated as a unit by screen reader
       *                              accessibility tools.
       *
       * @attr ref android.R.styleable#View_screenReaderFocusable
       */
      public void setScreenReaderFocusable(boolean screenReaderFocusable) {
          updatePflags3AndNotifyA11yIfChanged(PFLAG3_SCREEN_READER_FOCUSABLE, screenReaderFocusable);
      }
  
      /**
       * Gets whether this view is a heading for accessibility purposes.
       *
       * @return {@code true} if the view is a heading, {@code false} otherwise.
       *
       * @attr ref android.R.styleable#View_accessibilityHeading
       */
      @InspectableProperty
      public boolean isAccessibilityHeading() {
          return (mPrivateFlags3 & PFLAG3_ACCESSIBILITY_HEADING) != 0;
      }
  
      /**
       * Set if view is a heading for a section of content for accessibility purposes.
       *
       * @param isHeading {@code true} if the view is a heading, {@code false} otherwise.
       *
       * @attr ref android.R.styleable#View_accessibilityHeading
       */
      public void setAccessibilityHeading(boolean isHeading) {
          updatePflags3AndNotifyA11yIfChanged(PFLAG3_ACCESSIBILITY_HEADING, isHeading);
      }
  
      private void updatePflags3AndNotifyA11yIfChanged(int mask, boolean newValue) {
          int pflags3 = mPrivateFlags3;
          if (newValue) {
              pflags3 |= mask;
          } else {
              pflags3 &= ~mask;
          }
  
          if (pflags3 != mPrivateFlags3) {
              mPrivateFlags3 = pflags3;
              notifyViewAccessibilityStateChangedIfNeeded(
                      AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
          }
      }
  
      /**
       * Find the nearest view in the specified direction that can take focus.
       * This does not actually give focus to that view.
       *
       * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
       *
       * @return The nearest focusable in the specified direction, or null if none
       *         can be found.
       */
      public View focusSearch(@FocusRealDirection int direction) {
          if (mParent != null) {
              return mParent.focusSearch(this, direction);
          } else {
              return null;
          }
      }
  
      /**
       * Returns whether this View is a root of a keyboard navigation cluster.
       *
       * @return True if this view is a root of a cluster, or false otherwise.
       * @attr ref android.R.styleable#View_keyboardNavigationCluster
       */
      @ViewDebug.ExportedProperty(category = "focus")
      @InspectableProperty
      public final boolean isKeyboardNavigationCluster() {
          return (mPrivateFlags3 & PFLAG3_CLUSTER) != 0;
      }
  
      /**
       * Searches up the view hierarchy to find the top-most cluster. All deeper/nested clusters
       * will be ignored.
       *
       * @return the keyboard navigation cluster that this view is in (can be this view)
       *         or {@code null} if not in one
       */
      View findKeyboardNavigationCluster() {
          if (mParent instanceof View) {
              View cluster = ((View) mParent).findKeyboardNavigationCluster();
              if (cluster != null) {
                  return cluster;
              } else if (isKeyboardNavigationCluster()) {
                  return this;
              }
          }
          return null;
      }
  
      /**
       * Set whether this view is a root of a keyboard navigation cluster.
       *
       * @param isCluster If true, this view is a root of a cluster.
       *
       * @attr ref android.R.styleable#View_keyboardNavigationCluster
       */
      public void setKeyboardNavigationCluster(boolean isCluster) {
          if (isCluster) {
              mPrivateFlags3 |= PFLAG3_CLUSTER;
          } else {
              mPrivateFlags3 &= ~PFLAG3_CLUSTER;
          }
      }
  
      /**
       * Sets this View as the one which receives focus the next time cluster navigation jumps
       * to the cluster containing this View. This does NOT change focus even if the cluster
       * containing this view is current.
       *
       * @hide
       */
      @TestApi
      public final void setFocusedInCluster() {
          setFocusedInCluster(findKeyboardNavigationCluster());
      }
  
      private void setFocusedInCluster(View cluster) {
          if (this instanceof ViewGroup) {
              ((ViewGroup) this).mFocusedInCluster = null;
          }
          if (cluster == this) {
              return;
          }
          ViewParent parent = mParent;
          View child = this;
          while (parent instanceof ViewGroup) {
              ((ViewGroup) parent).mFocusedInCluster = child;
              if (parent == cluster) {
                  break;
              }
              child = (View) parent;
              parent = parent.getParent();
          }
      }
  
      private void updateFocusedInCluster(View oldFocus, @FocusDirection int direction) {
          if (oldFocus != null) {
              View oldCluster = oldFocus.findKeyboardNavigationCluster();
              View cluster = findKeyboardNavigationCluster();
              if (oldCluster != cluster) {
                  // Going from one cluster to another, so save last-focused.
                  // This covers cluster jumps because they are always FOCUS_DOWN
                  oldFocus.setFocusedInCluster(oldCluster);
                  if (!(oldFocus.mParent instanceof ViewGroup)) {
                      return;
                  }
                  if (direction == FOCUS_FORWARD || direction == FOCUS_BACKWARD) {
                      // This is a result of ordered navigation so consider navigation through
                      // the previous cluster "complete" and clear its last-focused memory.
                      ((ViewGroup) oldFocus.mParent).clearFocusedInCluster(oldFocus);
                  } else if (oldFocus instanceof ViewGroup
                          && ((ViewGroup) oldFocus).getDescendantFocusability()
                                  == ViewGroup.FOCUS_AFTER_DESCENDANTS
                          && ViewRootImpl.isViewDescendantOf(this, oldFocus)) {
                      // This means oldFocus is not focusable since it obviously has a focusable
                      // child (this). Don't restore focus to it in the future.
                      ((ViewGroup) oldFocus.mParent).clearFocusedInCluster(oldFocus);
                  }
              }
          }
      }
  
      /**
       * Returns whether this View should receive focus when the focus is restored for the view
       * hierarchy containing this view.
       * <p>
       * Focus gets restored for a view hierarchy when the root of the hierarchy gets added to a
       * window or serves as a target of cluster navigation.
       *
       * @see #restoreDefaultFocus()
       *
       * @return {@code true} if this view is the default-focus view, {@code false} otherwise
       * @attr ref android.R.styleable#View_focusedByDefault
       */
      @ViewDebug.ExportedProperty(category = "focus")
      @InspectableProperty
      public final boolean isFocusedByDefault() {
          return (mPrivateFlags3 & PFLAG3_FOCUSED_BY_DEFAULT) != 0;
      }
  
      /**
       * Sets whether this View should receive focus when the focus is restored for the view
       * hierarchy containing this view.
       * <p>
       * Focus gets restored for a view hierarchy when the root of the hierarchy gets added to a
       * window or serves as a target of cluster navigation.
       *
       * @param isFocusedByDefault {@code true} to set this view as the default-focus view,
       *                           {@code false} otherwise.
       *
       * @see #restoreDefaultFocus()
       *
       * @attr ref android.R.styleable#View_focusedByDefault
       */
      public void setFocusedByDefault(boolean isFocusedByDefault) {
          if (isFocusedByDefault == ((mPrivateFlags3 & PFLAG3_FOCUSED_BY_DEFAULT) != 0)) {
              return;
          }
  
          if (isFocusedByDefault) {
              mPrivateFlags3 |= PFLAG3_FOCUSED_BY_DEFAULT;
          } else {
              mPrivateFlags3 &= ~PFLAG3_FOCUSED_BY_DEFAULT;
          }
  
          if (mParent instanceof ViewGroup) {
              if (isFocusedByDefault) {
                  ((ViewGroup) mParent).setDefaultFocus(this);
              } else {
                  ((ViewGroup) mParent).clearDefaultFocus(this);
              }
          }
      }
  
      /**
       * Returns whether the view hierarchy with this view as a root contain a default-focus view.
       *
       * @return {@code true} if this view has default focus, {@code false} otherwise
       */
      boolean hasDefaultFocus() {
          return isFocusedByDefault();
      }
  
      /**
       * Find the nearest keyboard navigation cluster in the specified direction.
       * This does not actually give focus to that cluster.
       *
       * @param currentCluster The starting point of the search. Null means the current cluster is not
       *                       found yet
       * @param direction Direction to look
       *
       * @return The nearest keyboard navigation cluster in the specified direction, or null if none
       *         can be found
       */
      public View keyboardNavigationClusterSearch(View currentCluster,
              @FocusDirection int direction) {
          if (isKeyboardNavigationCluster()) {
              currentCluster = this;
          }
          if (isRootNamespace()) {
              // Root namespace means we should consider ourselves the top of the
              // tree for group searching; otherwise we could be group searching
              // into other tabs.  see LocalActivityManager and TabHost for more info.
              return FocusFinder.getInstance().findNextKeyboardNavigationCluster(
                      this, currentCluster, direction);
          } else if (mParent != null) {
              return mParent.keyboardNavigationClusterSearch(currentCluster, direction);
          }
          return null;
      }
  
      /**
       * This method is the last chance for the focused view and its ancestors to
       * respond to an arrow key. This is called when the focused view did not
       * consume the key internally, nor could the view system find a new view in
       * the requested direction to give focus to.
       *
       * @param focused The currently focused view.
       * @param direction The direction focus wants to move. One of FOCUS_UP,
       *        FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT.
       * @return True if the this view consumed this unhandled move.
       */
      public boolean dispatchUnhandledMove(View focused, @FocusRealDirection int direction) {
          return false;
      }
  
      /**
       * Sets whether this View should use a default focus highlight when it gets focused but doesn't
       * have {@link android.R.attr#state_focused} defined in its background.
       *
       * @param defaultFocusHighlightEnabled {@code true} to set this view to use a default focus
       *                                      highlight, {@code false} otherwise.
       *
       * @attr ref android.R.styleable#View_defaultFocusHighlightEnabled
       */
      public void setDefaultFocusHighlightEnabled(boolean defaultFocusHighlightEnabled) {
          mDefaultFocusHighlightEnabled = defaultFocusHighlightEnabled;
      }
  
      /**
  
      /**
       * Returns whether this View should use a default focus highlight when it gets focused but
       * doesn't have {@link android.R.attr#state_focused} defined in its background.
       *
       * @return True if this View should use a default focus highlight.
       * @attr ref android.R.styleable#View_defaultFocusHighlightEnabled
       */
      @ViewDebug.ExportedProperty(category = "focus")
      @InspectableProperty
      public final boolean getDefaultFocusHighlightEnabled() {
          return mDefaultFocusHighlightEnabled;
      }
  
      /**
       * If a user manually specified the next view id for a particular direction,
       * use the root to look up the view.
       * @param root The root view of the hierarchy containing this view.
       * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD,
       * or FOCUS_BACKWARD.
       * @return The user specified next view, or null if there is none.
       */
      View findUserSetNextFocus(View root, @FocusDirection int direction) {
          switch (direction) {
              case FOCUS_LEFT:
                  if (mNextFocusLeftId == View.NO_ID) return null;
                  return findViewInsideOutShouldExist(root, mNextFocusLeftId);
              case FOCUS_RIGHT:
                  if (mNextFocusRightId == View.NO_ID) return null;
                  return findViewInsideOutShouldExist(root, mNextFocusRightId);
              case FOCUS_UP:
                  if (mNextFocusUpId == View.NO_ID) return null;
                  return findViewInsideOutShouldExist(root, mNextFocusUpId);
              case FOCUS_DOWN:
                  if (mNextFocusDownId == View.NO_ID) return null;
                  return findViewInsideOutShouldExist(root, mNextFocusDownId);
              case FOCUS_FORWARD:
                  if (mNextFocusForwardId == View.NO_ID) return null;
                  return findViewInsideOutShouldExist(root, mNextFocusForwardId);
              case FOCUS_BACKWARD: {
                  if (mID == View.NO_ID) return null;
                  final int id = mID;
                  return root.findViewByPredicateInsideOut(this, new Predicate<View>() {
                      @Override
                      public boolean test(View t) {
                          return t.mNextFocusForwardId == id;
                      }
                  });
              }
          }
          return null;
      }
  
      /**
       * If a user manually specified the next keyboard-navigation cluster for a particular direction,
       * use the root to look up the view.
       *
       * @param root the root view of the hierarchy containing this view
       * @param direction {@link #FOCUS_FORWARD} or {@link #FOCUS_BACKWARD}
       * @return the user-specified next cluster, or {@code null} if there is none
       */
      View findUserSetNextKeyboardNavigationCluster(View root, @FocusDirection int direction) {
          switch (direction) {
              case FOCUS_FORWARD:
                  if (mNextClusterForwardId == View.NO_ID) return null;
                  return findViewInsideOutShouldExist(root, mNextClusterForwardId);
              case FOCUS_BACKWARD: {
                  if (mID == View.NO_ID) return null;
                  final int id = mID;
                  return root.findViewByPredicateInsideOut(this,
                          (Predicate<View>) t -> t.mNextClusterForwardId == id);
              }
          }
          return null;
      }
  
      private View findViewInsideOutShouldExist(View root, int id) {
          if (mMatchIdPredicate == null) {
              mMatchIdPredicate = new MatchIdPredicate();
          }
          mMatchIdPredicate.mId = id;
          View result = root.findViewByPredicateInsideOut(this, mMatchIdPredicate);
          if (result == null) {
              Log.w(VIEW_LOG_TAG, "couldn't find view with id " + id);
          }
          return result;
      }
  
      /**
       * Find and return all focusable views that are descendants of this view,
       * possibly including this view if it is focusable itself.
       *
       * @param direction The direction of the focus
       * @return A list of focusable views
       */
      public ArrayList<View> getFocusables(@FocusDirection int direction) {
          ArrayList<View> result = new ArrayList<View>(24);
          addFocusables(result, direction);
          return result;
      }
  
      /**
       * Add any focusable views that are descendants of this view (possibly
       * including this view if it is focusable itself) to views.  If we are in touch mode,
       * only add views that are also focusable in touch mode.
       *
       * @param views Focusable views found so far
       * @param direction The direction of the focus
       */
      public void addFocusables(ArrayList<View> views, @FocusDirection int direction) {
          addFocusables(views, direction, isInTouchMode() ? FOCUSABLES_TOUCH_MODE : FOCUSABLES_ALL);
      }
  
      /**
       * Adds any focusable views that are descendants of this view (possibly
       * including this view if it is focusable itself) to views. This method
       * adds all focusable views regardless if we are in touch mode or
       * only views focusable in touch mode if we are in touch mode or
       * only views that can take accessibility focus if accessibility is enabled
       * depending on the focusable mode parameter.
       *
       * @param views Focusable views found so far or null if all we are interested is
       *        the number of focusables.
       * @param direction The direction of the focus.
       * @param focusableMode The type of focusables to be added.
       *
       * @see #FOCUSABLES_ALL
       * @see #FOCUSABLES_TOUCH_MODE
       */
      public void addFocusables(ArrayList<View> views, @FocusDirection int direction,
              @FocusableMode int focusableMode) {
          if (views == null) {
              return;
          }
          if (!canTakeFocus()) {
              return;
          }
          if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE
                  && !isFocusableInTouchMode()) {
              return;
          }
          views.add(this);
      }
  
      /**
       * Adds any keyboard navigation cluster roots that are descendants of this view (possibly
       * including this view if it is a cluster root itself) to views.
       *
       * @param views Keyboard navigation cluster roots found so far
       * @param direction Direction to look
       */
      public void addKeyboardNavigationClusters(
              @NonNull Collection<View> views,
              int direction) {
          if (!isKeyboardNavigationCluster()) {
              return;
          }
          if (!hasFocusable()) {
              return;
          }
          views.add(this);
      }
  
      /**
       * Finds the Views that contain given text. The containment is case insensitive.
       * The search is performed by either the text that the View renders or the content
       * description that describes the view for accessibility purposes and the view does
       * not render or both. Clients can specify how the search is to be performed via
       * passing the {@link #FIND_VIEWS_WITH_TEXT} and
       * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags.
       *
       * @param outViews The output list of matching Views.
       * @param searched The text to match against.
       *
       * @see #FIND_VIEWS_WITH_TEXT
       * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION
       * @see #setContentDescription(CharSequence)
       */
      public void findViewsWithText(ArrayList<View> outViews, CharSequence searched,
              @FindViewFlags int flags) {
          if (getAccessibilityNodeProvider() != null) {
              if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) {
                  outViews.add(this);
              }
          } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0
                  && (searched != null && searched.length() > 0)
                  && (mContentDescription != null && mContentDescription.length() > 0)) {
              String searchedLowerCase = searched.toString().toLowerCase();
              String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase();
              if (contentDescriptionLowerCase.contains(searchedLowerCase)) {
                  outViews.add(this);
              }
          }
      }
  
      /**
       * Find and return all touchable views that are descendants of this view,
       * possibly including this view if it is touchable itself.
       *
       * @return A list of touchable views
       */
      public ArrayList<View> getTouchables() {
          ArrayList<View> result = new ArrayList<View>();
          addTouchables(result);
          return result;
      }
  
      /**
       * Add any touchable views that are descendants of this view (possibly
       * including this view if it is touchable itself) to views.
       *
       * @param views Touchable views found so far
       */
      public void addTouchables(ArrayList<View> views) {
          final int viewFlags = mViewFlags;
  
          if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE
                  || (viewFlags & CONTEXT_CLICKABLE) == CONTEXT_CLICKABLE)
                  && (viewFlags & ENABLED_MASK) == ENABLED) {
              views.add(this);
          }
      }
  
      /**
       * Returns whether this View is accessibility focused.
       *
       * @return True if this View is accessibility focused.
       */
      @InspectableProperty(hasAttributeId = false)
      public boolean isAccessibilityFocused() {
          return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0;
      }
  
      /**
       * Call this to try to give accessibility focus to this view.
       *
       * A view will not actually take focus if {@link AccessibilityManager#isEnabled()}
       * returns false or the view is no visible or the view already has accessibility
       * focus.
       *
       * See also {@link #focusSearch(int)}, which is what you call to say that you
       * have focus, and you want your parent to look for the next one.
       *
       * @return Whether this view actually took accessibility focus.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public boolean requestAccessibilityFocus() {
          AccessibilityManager manager = AccessibilityManager.getInstance(mContext);
          if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) {
              return false;
          }
          if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) {
              return false;
          }
          if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) == 0) {
              mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_FOCUSED;
              ViewRootImpl viewRootImpl = getViewRootImpl();
              if (viewRootImpl != null) {
                  viewRootImpl.setAccessibilityFocus(this, null);
              }
              invalidate();
              sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED);
              return true;
          }
          return false;
      }
  
      /**
       * Call this to try to clear accessibility focus of this view.
       *
       * See also {@link #focusSearch(int)}, which is what you call to say that you
       * have focus, and you want your parent to look for the next one.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public void clearAccessibilityFocus() {
          clearAccessibilityFocusNoCallbacks(0);
  
          // Clear the global reference of accessibility focus if this view or
          // any of its descendants had accessibility focus. This will NOT send
          // an event or update internal state if focus is cleared from a
          // descendant view, which may leave views in inconsistent states.
          final ViewRootImpl viewRootImpl = getViewRootImpl();
          if (viewRootImpl != null) {
              final View focusHost = viewRootImpl.getAccessibilityFocusedHost();
              if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) {
                  viewRootImpl.setAccessibilityFocus(null, null);
              }
          }
      }
  
      private void sendAccessibilityHoverEvent(int eventType) {
          // Since we are not delivering to a client accessibility events from not
          // important views (unless the clinet request that) we need to fire the
          // event from the deepest view exposed to the client. As a consequence if
          // the user crosses a not exposed view the client will see enter and exit
          // of the exposed predecessor followed by and enter and exit of that same
          // predecessor when entering and exiting the not exposed descendant. This
          // is fine since the client has a clear idea which view is hovered at the
          // price of a couple more events being sent. This is a simple and
          // working solution.
          View source = this;
          while (true) {
              if (source.includeForAccessibility()) {
                  source.sendAccessibilityEvent(eventType);
                  return;
              }
              ViewParent parent = source.getParent();
              if (parent instanceof View) {
                  source = (View) parent;
              } else {
                  return;
              }
          }
      }
  
      /**
       * Clears accessibility focus without calling any callback methods
       * normally invoked in {@link #clearAccessibilityFocus()}. This method
       * is used separately from that one for clearing accessibility focus when
       * giving this focus to another view.
       *
       * @param action The action, if any, that led to focus being cleared. Set to
       * AccessibilityNodeInfo#ACTION_ACCESSIBILITY_FOCUS to specify that focus is moving within
       * the window.
       */
      void clearAccessibilityFocusNoCallbacks(int action) {
          if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) {
              mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED;
              invalidate();
              if (AccessibilityManager.getInstance(mContext).isEnabled()) {
                  AccessibilityEvent event = AccessibilityEvent.obtain(
                          AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED);
                  event.setAction(action);
                  if (mAccessibilityDelegate != null) {
                      mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event);
                  } else {
                      sendAccessibilityEventUnchecked(event);
                  }
              }
          }
      }
  
      /**
       * Call this to try to give focus to a specific view or to one of its
       * descendants.
       *
       * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns
       * false), or if it can't be focused due to other conditions (not focusable in touch mode
       * ({@link #isFocusableInTouchMode}) while the device is in touch mode, not visible, not
       * enabled, or has no size).
       *
       * See also {@link #focusSearch(int)}, which is what you call to say that you
       * have focus, and you want your parent to look for the next one.
       *
       * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments
       * {@link #FOCUS_DOWN} and <code>null</code>.
       *
       * @return Whether this view or one of its descendants actually took focus.
       */
      public final boolean requestFocus() {
          return requestFocus(View.FOCUS_DOWN);
      }
  
      /**
       * This will request focus for whichever View was last focused within this
       * cluster before a focus-jump out of it.
       *
       * @hide
       */
      @TestApi
      public boolean restoreFocusInCluster(@FocusRealDirection int direction) {
          // Prioritize focusableByDefault over algorithmic focus selection.
          if (restoreDefaultFocus()) {
              return true;
          }
          return requestFocus(direction);
      }
  
      /**
       * This will request focus for whichever View not in a cluster was last focused before a
       * focus-jump to a cluster. If no non-cluster View has previously had focus, this will focus
       * the "first" focusable view it finds.
       *
       * @hide
       */
      @TestApi
      public boolean restoreFocusNotInCluster() {
          return requestFocus(View.FOCUS_DOWN);
      }
  
      /**
       * Gives focus to the default-focus view in the view hierarchy that has this view as a root.
       * If the default-focus view cannot be found, falls back to calling {@link #requestFocus(int)}.
       *
       * @return Whether this view or one of its descendants actually took focus
       */
      public boolean restoreDefaultFocus() {
          return requestFocus(View.FOCUS_DOWN);
      }
  
      /**
       * Call this to try to give focus to a specific view or to one of its
       * descendants and give it a hint about what direction focus is heading.
       *
       * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns
       * false), or if it is focusable and it is not focusable in touch mode
       * ({@link #isFocusableInTouchMode}) while the device is in touch mode.
       *
       * See also {@link #focusSearch(int)}, which is what you call to say that you
       * have focus, and you want your parent to look for the next one.
       *
       * This is equivalent to calling {@link #requestFocus(int, Rect)} with
       * <code>null</code> set for the previously focused rectangle.
       *
       * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
       * @return Whether this view or one of its descendants actually took focus.
       */
      public final boolean requestFocus(int direction) {
          return requestFocus(direction, null);
      }
  
      /**
       * Call this to try to give focus to a specific view or to one of its descendants
       * and give it hints about the direction and a specific rectangle that the focus
       * is coming from.  The rectangle can help give larger views a finer grained hint
       * about where focus is coming from, and therefore, where to show selection, or
       * forward focus change internally.
       *
       * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns
       * false), or if it is focusable and it is not focusable in touch mode
       * ({@link #isFocusableInTouchMode}) while the device is in touch mode.
       *
       * A View will not take focus if it is not visible.
       *
       * A View will not take focus if one of its parents has
       * {@link android.view.ViewGroup#getDescendantFocusability()} equal to
       * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}.
       *
       * See also {@link #focusSearch(int)}, which is what you call to say that you
       * have focus, and you want your parent to look for the next one.
       *
       * You may wish to override this method if your custom {@link View} has an internal
       * {@link View} that it wishes to forward the request to.
       *
       * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
       * @param previouslyFocusedRect The rectangle (in this View's coordinate system)
       *        to give a finer grained hint about where focus is coming from.  May be null
       *        if there is no hint.
       * @return Whether this view or one of its descendants actually took focus.
       */
      public boolean requestFocus(int direction, Rect previouslyFocusedRect) {
          return requestFocusNoSearch(direction, previouslyFocusedRect);
      }
  
      private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) {
          // need to be focusable
          if (!canTakeFocus()) {
              return false;
          }
  
          // need to be focusable in touch mode if in touch mode
          if (isInTouchMode() &&
              (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) {
                 return false;
          }
  
          // need to not have any parents blocking us
          if (hasAncestorThatBlocksDescendantFocus()) {
              return false;
          }
  
          if (!isLayoutValid()) {
              mPrivateFlags |= PFLAG_WANTS_FOCUS;
          } else {
              clearParentsWantFocus();
          }
  
          handleFocusGainInternal(direction, previouslyFocusedRect);
          return true;
      }
  
      void clearParentsWantFocus() {
          if (mParent instanceof View) {
              ((View) mParent).mPrivateFlags &= ~PFLAG_WANTS_FOCUS;
              ((View) mParent).clearParentsWantFocus();
          }
      }
  
      /**
       * Call this to try to give focus to a specific view or to one of its descendants. This is a
       * special variant of {@link #requestFocus() } that will allow views that are not focusable in
       * touch mode to request focus when they are touched.
       *
       * @return Whether this view or one of its descendants actually took focus.
       *
       * @see #isInTouchMode()
       *
       */
      public final boolean requestFocusFromTouch() {
          // Leave touch mode if we need to
          if (isInTouchMode()) {
              ViewRootImpl viewRoot = getViewRootImpl();
              if (viewRoot != null) {
                  viewRoot.ensureTouchMode(false);
              }
          }
          return requestFocus(View.FOCUS_DOWN);
      }
  
      /**
       * @return Whether any ancestor of this view blocks descendant focus.
       */
      private boolean hasAncestorThatBlocksDescendantFocus() {
          final boolean focusableInTouchMode = isFocusableInTouchMode();
          ViewParent ancestor = mParent;
          while (ancestor instanceof ViewGroup) {
              final ViewGroup vgAncestor = (ViewGroup) ancestor;
              if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS
                      || (!focusableInTouchMode && vgAncestor.shouldBlockFocusForTouchscreen())) {
                  return true;
              } else {
                  ancestor = vgAncestor.getParent();
              }
          }
          return false;
      }
  
      /**
       * Gets the mode for determining whether this View is important for accessibility.
       * A view is important for accessibility if it fires accessibility events and if it
       * is reported to accessibility services that query the screen.
       *
       * @return The mode for determining whether a view is important for accessibility, one
       * of {@link #IMPORTANT_FOR_ACCESSIBILITY_AUTO}, {@link #IMPORTANT_FOR_ACCESSIBILITY_YES},
       * {@link #IMPORTANT_FOR_ACCESSIBILITY_NO}, or
       * {@link #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS}.
       *
       * @attr ref android.R.styleable#View_importantForAccessibility
       *
       * @see #IMPORTANT_FOR_ACCESSIBILITY_YES
       * @see #IMPORTANT_FOR_ACCESSIBILITY_NO
       * @see #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS
       * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO
       */
      @ViewDebug.ExportedProperty(category = "accessibility", mapping = {
              @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"),
              @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"),
              @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no"),
              @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS,
                      to = "noHideDescendants")
          })
      @InspectableProperty(enumMapping = {
              @EnumEntry(value = IMPORTANT_FOR_ACCESSIBILITY_AUTO, name = "auto"),
              @EnumEntry(value = IMPORTANT_FOR_ACCESSIBILITY_YES, name = "yes"),
              @EnumEntry(value = IMPORTANT_FOR_ACCESSIBILITY_NO, name = "no"),
              @EnumEntry(value = IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS,
                      name = "noHideDescendants"),
      })
      public int getImportantForAccessibility() {
          return (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK)
                  >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT;
      }
  
      /**
       * Sets the live region mode for this view. This indicates to accessibility
       * services whether they should automatically notify the user about changes
       * to the view's content description or text, or to the content descriptions
       * or text of the view's children (where applicable).
       * <p>
       * For example, in a login screen with a TextView that displays an "incorrect
       * password" notification, that view should be marked as a live region with
       * mode {@link #ACCESSIBILITY_LIVE_REGION_POLITE}.
       * <p>
       * To disable change notifications for this view, use
       * {@link #ACCESSIBILITY_LIVE_REGION_NONE}. This is the default live region
       * mode for most views.
       * <p>
       * To indicate that the user should be notified of changes, use
       * {@link #ACCESSIBILITY_LIVE_REGION_POLITE}.
       * <p>
       * If the view's changes should interrupt ongoing speech and notify the user
       * immediately, use {@link #ACCESSIBILITY_LIVE_REGION_ASSERTIVE}.
       *
       * @param mode The live region mode for this view, one of:
       *        <ul>
       *        <li>{@link #ACCESSIBILITY_LIVE_REGION_NONE}
       *        <li>{@link #ACCESSIBILITY_LIVE_REGION_POLITE}
       *        <li>{@link #ACCESSIBILITY_LIVE_REGION_ASSERTIVE}
       *        </ul>
       * @attr ref android.R.styleable#View_accessibilityLiveRegion
       */
      public void setAccessibilityLiveRegion(int mode) {
          if (mode != getAccessibilityLiveRegion()) {
              mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK;
              mPrivateFlags2 |= (mode << PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT)
                      & PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK;
              notifyViewAccessibilityStateChangedIfNeeded(
                      AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
          }
      }
  
      /**
       * Gets the live region mode for this View.
       *
       * @return The live region mode for the view.
       *
       * @attr ref android.R.styleable#View_accessibilityLiveRegion
       *
       * @see #setAccessibilityLiveRegion(int)
       */
      @InspectableProperty(enumMapping = {
              @EnumEntry(value = ACCESSIBILITY_LIVE_REGION_NONE, name = "none"),
              @EnumEntry(value = ACCESSIBILITY_LIVE_REGION_POLITE, name = "polite"),
              @EnumEntry(value = ACCESSIBILITY_LIVE_REGION_ASSERTIVE, name = "assertive")
      })
      public int getAccessibilityLiveRegion() {
          return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK)
                  >> PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT;
      }
  
      /**
       * Sets how to determine whether this view is important for accessibility
       * which is if it fires accessibility events and if it is reported to
       * accessibility services that query the screen.
       *
       * @param mode How to determine whether this view is important for accessibility.
       *
       * @attr ref android.R.styleable#View_importantForAccessibility
       *
       * @see #IMPORTANT_FOR_ACCESSIBILITY_YES
       * @see #IMPORTANT_FOR_ACCESSIBILITY_NO
       * @see #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS
       * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO
       */
      public void setImportantForAccessibility(int mode) {
          final int oldMode = getImportantForAccessibility();
          if (mode != oldMode) {
              final boolean hideDescendants =
                      mode == IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS;
  
              // If this node or its descendants are no longer important, try to
              // clear accessibility focus.
              if (mode == IMPORTANT_FOR_ACCESSIBILITY_NO || hideDescendants) {
                  final View focusHost = findAccessibilityFocusHost(hideDescendants);
                  if (focusHost != null) {
                      focusHost.clearAccessibilityFocus();
                  }
              }
  
              // If we're moving between AUTO and another state, we might not need
              // to send a subtree changed notification. We'll store the computed
              // importance, since we'll need to check it later to make sure.
              final boolean maySkipNotify = oldMode == IMPORTANT_FOR_ACCESSIBILITY_AUTO
                      || mode == IMPORTANT_FOR_ACCESSIBILITY_AUTO;
              final boolean oldIncludeForAccessibility = maySkipNotify && includeForAccessibility();
              mPrivateFlags2 &= ~PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK;
              mPrivateFlags2 |= (mode << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT)
                      & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK;
              if (!maySkipNotify || oldIncludeForAccessibility != includeForAccessibility()) {
                  notifySubtreeAccessibilityStateChangedIfNeeded();
              } else {
                  notifyViewAccessibilityStateChangedIfNeeded(
                          AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
              }
          }
      }
  
      /**
       * Returns the view within this view's hierarchy that is hosting
       * accessibility focus.
       *
       * @param searchDescendants whether to search for focus in descendant views
       * @return the view hosting accessibility focus, or {@code null}
       */
      private View findAccessibilityFocusHost(boolean searchDescendants) {
          if (isAccessibilityFocusedViewOrHost()) {
              return this;
          }
  
          if (searchDescendants) {
              final ViewRootImpl viewRoot = getViewRootImpl();
              if (viewRoot != null) {
                  final View focusHost = viewRoot.getAccessibilityFocusedHost();
                  if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) {
                      return focusHost;
                  }
              }
          }
  
          return null;
      }
  
      /**
       * Computes whether this view should be exposed for accessibility. In
       * general, views that are interactive or provide information are exposed
       * while views that serve only as containers are hidden.
       * <p>
       * If an ancestor of this view has importance
       * {@link #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS}, this method
       * returns <code>false</code>.
       * <p>
       * Otherwise, the value is computed according to the view's
       * {@link #getImportantForAccessibility()} value:
       * <ol>
       * <li>{@link #IMPORTANT_FOR_ACCESSIBILITY_NO} or
       * {@link #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS}, return <code>false
       * </code>
       * <li>{@link #IMPORTANT_FOR_ACCESSIBILITY_YES}, return <code>true</code>
       * <li>{@link #IMPORTANT_FOR_ACCESSIBILITY_AUTO}, return <code>true</code> if
       * view satisfies any of the following:
       * <ul>
       * <li>Is actionable, e.g. {@link #isClickable()},
       * {@link #isLongClickable()}, or {@link #isFocusable()}
       * <li>Has an {@link AccessibilityDelegate}
       * <li>Has an interaction listener, e.g. {@link OnTouchListener},
       * {@link OnKeyListener}, etc.
       * <li>Is an accessibility live region, e.g.
       * {@link #getAccessibilityLiveRegion()} is not
       * {@link #ACCESSIBILITY_LIVE_REGION_NONE}.
       * </ul>
       * <li>Has an accessibility pane title, see {@link #setAccessibilityPaneTitle}</li>
       * </ol>
       *
       * @return Whether the view is exposed for accessibility.
       * @see #setImportantForAccessibility(int)
       * @see #getImportantForAccessibility()
       */
      public boolean isImportantForAccessibility() {
          final int mode = (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK)
                  >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT;
          if (mode == IMPORTANT_FOR_ACCESSIBILITY_NO
                  || mode == IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) {
              return false;
          }
  
          // Check parent mode to ensure we're not hidden.
          ViewParent parent = mParent;
          while (parent instanceof View) {
              if (((View) parent).getImportantForAccessibility()
                      == IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) {
                  return false;
              }
              parent = parent.getParent();
          }
  
          return mode == IMPORTANT_FOR_ACCESSIBILITY_YES || isActionableForAccessibility()
                  || hasListenersForAccessibility() || getAccessibilityNodeProvider() != null
                  || getAccessibilityLiveRegion() != ACCESSIBILITY_LIVE_REGION_NONE
                  || isAccessibilityPane();
      }
  
      /**
       * Gets the parent for accessibility purposes. Note that the parent for
       * accessibility is not necessary the immediate parent. It is the first
       * predecessor that is important for accessibility.
       *
       * @return The parent for accessibility purposes.
       */
      public ViewParent getParentForAccessibility() {
          if (mParent instanceof View) {
              View parentView = (View) mParent;
              if (parentView.includeForAccessibility()) {
                  return mParent;
              } else {
                  return mParent.getParentForAccessibility();
              }
          }
          return null;
      }
  
      /** @hide */
      View getSelfOrParentImportantForA11y() {
          if (isImportantForAccessibility()) return this;
          ViewParent parent = getParentForAccessibility();
          if (parent instanceof View) return (View) parent;
          return null;
      }
  
      /**
       * Adds the children of this View relevant for accessibility to the given list
       * as output. Since some Views are not important for accessibility the added
       * child views are not necessarily direct children of this view, rather they are
       * the first level of descendants important for accessibility.
       *
       * @param outChildren The output list that will receive children for accessibility.
       */
      public void addChildrenForAccessibility(ArrayList<View> outChildren) {
  
      }
  
      /**
       * Whether to regard this view for accessibility. A view is regarded for
       * accessibility if it is important for accessibility or the querying
       * accessibility service has explicitly requested that view not
       * important for accessibility are regarded.
       *
       * @return Whether to regard the view for accessibility.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public boolean includeForAccessibility() {
          if (mAttachInfo != null) {
              return (mAttachInfo.mAccessibilityFetchFlags
                      & AccessibilityNodeInfo.FLAG_INCLUDE_NOT_IMPORTANT_VIEWS) != 0
                      || isImportantForAccessibility();
          }
          return false;
      }
  
      /**
       * Returns whether the View is considered actionable from
       * accessibility perspective. Such view are important for
       * accessibility.
       *
       * @return True if the view is actionable for accessibility.
       *
       * @hide
       */
      public boolean isActionableForAccessibility() {
          return (isClickable() || isLongClickable() || isFocusable());
      }
  
      /**
       * Returns whether the View has registered callbacks which makes it
       * important for accessibility.
       *
       * @return True if the view is actionable for accessibility.
       */
      private boolean hasListenersForAccessibility() {
          ListenerInfo info = getListenerInfo();
          return mTouchDelegate != null || info.mOnKeyListener != null
                  || info.mOnTouchListener != null || info.mOnGenericMotionListener != null
                  || info.mOnHoverListener != null || info.mOnDragListener != null;
      }
  
      /**
       * Notifies that the accessibility state of this view changed. The change
       * is local to this view and does not represent structural changes such
       * as children and parent. For example, the view became focusable. The
       * notification is at at most once every
       * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}
       * to avoid unnecessary load to the system. Also once a view has a pending
       * notification this method is a NOP until the notification has been sent.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public void notifyViewAccessibilityStateChangedIfNeeded(int changeType) {
          if (!AccessibilityManager.getInstance(mContext).isEnabled() || mAttachInfo == null) {
              return;
          }
  
          // Changes to views with a pane title count as window state changes, as the pane title
          // marks them as significant parts of the UI.
          if ((changeType != AccessibilityEvent.CONTENT_CHANGE_TYPE_SUBTREE)
                  && isAccessibilityPane()) {
              // If the pane isn't visible, content changed events are sufficient unless we're
              // reporting that the view just disappeared
              if ((getVisibility() == VISIBLE)
                      || (changeType == AccessibilityEvent.CONTENT_CHANGE_TYPE_PANE_DISAPPEARED)) {
                  final AccessibilityEvent event = AccessibilityEvent.obtain();
                  onInitializeAccessibilityEvent(event);
                  event.setEventType(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
                  event.setContentChangeTypes(changeType);
                  event.setSource(this);
                  onPopulateAccessibilityEvent(event);
                  if (mParent != null) {
                      try {
                          mParent.requestSendAccessibilityEvent(this, event);
                      } catch (AbstractMethodError e) {
                          Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName()
                                  + " does not fully implement ViewParent", e);
                      }
                  }
                  return;
              }
          }
  
          // If this is a live region, we should send a subtree change event
          // from this view immediately. Otherwise, we can let it propagate up.
          if (getAccessibilityLiveRegion() != ACCESSIBILITY_LIVE_REGION_NONE) {
              final AccessibilityEvent event = AccessibilityEvent.obtain();
              event.setEventType(AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED);
              event.setContentChangeTypes(changeType);
              sendAccessibilityEventUnchecked(event);
          } else if (mParent != null) {
              try {
                  mParent.notifySubtreeAccessibilityStateChanged(this, this, changeType);
              } catch (AbstractMethodError e) {
                  Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
                          " does not fully implement ViewParent", e);
              }
          }
      }
  
      /**
       * Notifies that the accessibility state of this view changed. The change
       * is *not* local to this view and does represent structural changes such
       * as children and parent. For example, the view size changed. The
       * notification is at at most once every
       * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}
       * to avoid unnecessary load to the system. Also once a view has a pending
       * notification this method is a NOP until the notification has been sent.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public void notifySubtreeAccessibilityStateChangedIfNeeded() {
          if (!AccessibilityManager.getInstance(mContext).isEnabled() || mAttachInfo == null) {
              return;
          }
  
          if ((mPrivateFlags2 & PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED) == 0) {
              mPrivateFlags2 |= PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED;
              if (mParent != null) {
                  try {
                      mParent.notifySubtreeAccessibilityStateChanged(
                              this, this, AccessibilityEvent.CONTENT_CHANGE_TYPE_SUBTREE);
                  } catch (AbstractMethodError e) {
                      Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
                              " does not fully implement ViewParent", e);
                  }
              }
          }
      }
  
      /**
       * Changes the visibility of this View without triggering any other changes. This should only
       * be used by animation frameworks, such as {@link android.transition.Transition}, where
       * visibility changes should not adjust focus or trigger a new layout. Application developers
       * should use {@link #setVisibility} instead to ensure that the hierarchy is correctly updated.
       *
       * <p>Only call this method when a temporary visibility must be applied during an
       * animation and the original visibility value is guaranteed to be reset after the
       * animation completes. Use {@link #setVisibility} in all other cases.</p>
       *
       * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}.
       * @see #setVisibility(int)
       */
      public void setTransitionVisibility(@Visibility int visibility) {
          mViewFlags = (mViewFlags & ~View.VISIBILITY_MASK) | visibility;
      }
  
      /**
       * Reset the flag indicating the accessibility state of the subtree rooted
       * at this view changed.
       */
      void resetSubtreeAccessibilityStateChanged() {
          mPrivateFlags2 &= ~PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED;
      }
  
      /**
       * Report an accessibility action to this view's parents for delegated processing.
       *
       * <p>Implementations of {@link #performAccessibilityAction(int, Bundle)} may internally
       * call this method to delegate an accessibility action to a supporting parent. If the parent
       * returns true from its
       * {@link ViewParent#onNestedPrePerformAccessibilityAction(View, int, android.os.Bundle)}
       * method this method will return true to signify that the action was consumed.</p>
       *
       * <p>This method is useful for implementing nested scrolling child views. If
       * {@link #isNestedScrollingEnabled()} returns true and the action is a scrolling action
       * a custom view implementation may invoke this method to allow a parent to consume the
       * scroll first. If this method returns true the custom view should skip its own scrolling
       * behavior.</p>
       *
       * @param action Accessibility action to delegate
       * @param arguments Optional action arguments
       * @return true if the action was consumed by a parent
       */
      public boolean dispatchNestedPrePerformAccessibilityAction(int action, Bundle arguments) {
          for (ViewParent p = getParent(); p != null; p = p.getParent()) {
              if (p.onNestedPrePerformAccessibilityAction(this, action, arguments)) {
                  return true;
              }
          }
          return false;
      }
  
      /**
       * Performs the specified accessibility action on the view. For
       * possible accessibility actions look at {@link AccessibilityNodeInfo}.
       * <p>
       * If an {@link AccessibilityDelegate} has been specified via calling
       * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
       * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)}
       * is responsible for handling this call.
       * </p>
       *
       * <p>The default implementation will delegate
       * {@link AccessibilityNodeInfo#ACTION_SCROLL_BACKWARD} and
       * {@link AccessibilityNodeInfo#ACTION_SCROLL_FORWARD} to nested scrolling parents if
       * {@link #isNestedScrollingEnabled() nested scrolling is enabled} on this view.</p>
       *
       * @param action The action to perform.
       * @param arguments Optional action arguments.
       * @return Whether the action was performed.
       */
      public boolean performAccessibilityAction(int action, Bundle arguments) {
        if (mAccessibilityDelegate != null) {
            return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments);
        } else {
            return performAccessibilityActionInternal(action, arguments);
        }
      }
  
     /**
      * @see #performAccessibilityAction(int, Bundle)
      *
      * Note: Called from the default {@link AccessibilityDelegate}.
      *
      * @hide
      */
      @UnsupportedAppUsage
      public boolean performAccessibilityActionInternal(int action, Bundle arguments) {
          if (isNestedScrollingEnabled()
                  && (action == AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD
                  || action == AccessibilityNodeInfo.ACTION_SCROLL_FORWARD
                  || action == R.id.accessibilityActionScrollUp
                  || action == R.id.accessibilityActionScrollLeft
                  || action == R.id.accessibilityActionScrollDown
                  || action == R.id.accessibilityActionScrollRight)) {
              if (dispatchNestedPrePerformAccessibilityAction(action, arguments)) {
                  return true;
              }
          }
  
          switch (action) {
              case AccessibilityNodeInfo.ACTION_CLICK: {
                  if (isClickable()) {
                      performClickInternal();
                      return true;
                  }
              } break;
              case AccessibilityNodeInfo.ACTION_LONG_CLICK: {
                  if (isLongClickable()) {
                      performLongClick();
                      return true;
                  }
              } break;
              case AccessibilityNodeInfo.ACTION_FOCUS: {
                  if (!hasFocus()) {
                      // Get out of touch mode since accessibility
                      // wants to move focus around.
                      getViewRootImpl().ensureTouchMode(false);
                      return requestFocus();
                  }
              } break;
              case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: {
                  if (hasFocus()) {
                      clearFocus();
                      return !isFocused();
                  }
              } break;
              case AccessibilityNodeInfo.ACTION_SELECT: {
                  if (!isSelected()) {
                      setSelected(true);
                      return isSelected();
                  }
              } break;
              case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: {
                  if (isSelected()) {
                      setSelected(false);
                      return !isSelected();
                  }
              } break;
              case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: {
                  if (!isAccessibilityFocused()) {
                      return requestAccessibilityFocus();
                  }
              } break;
              case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: {
                  if (isAccessibilityFocused()) {
                      clearAccessibilityFocus();
                      return true;
                  }
              } break;
              case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: {
                  if (arguments != null) {
                      final int granularity = arguments.getInt(
                              AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT);
                      final boolean extendSelection = arguments.getBoolean(
                              AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN);
                      return traverseAtGranularity(granularity, true, extendSelection);
                  }
              } break;
              case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: {
                  if (arguments != null) {
                      final int granularity = arguments.getInt(
                              AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT);
                      final boolean extendSelection = arguments.getBoolean(
                              AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN);
                      return traverseAtGranularity(granularity, false, extendSelection);
                  }
              } break;
              case AccessibilityNodeInfo.ACTION_SET_SELECTION: {
                  CharSequence text = getIterableTextForAccessibility();
                  if (text == null) {
                      return false;
                  }
                  final int start = (arguments != null) ? arguments.getInt(
                          AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_START_INT, -1) : -1;
                  final int end = (arguments != null) ? arguments.getInt(
                  AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_END_INT, -1) : -1;
                  // Only cursor position can be specified (selection length == 0)
                  if ((getAccessibilitySelectionStart() != start
                          || getAccessibilitySelectionEnd() != end)
                          && (start == end)) {
                      setAccessibilitySelection(start, end);
                      notifyViewAccessibilityStateChangedIfNeeded(
                              AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
                      return true;
                  }
              } break;
              case R.id.accessibilityActionShowOnScreen: {
                  if (mAttachInfo != null) {
                      final Rect r = mAttachInfo.mTmpInvalRect;
                      getDrawingRect(r);
                      return requestRectangleOnScreen(r, true);
                  }
              } break;
              case R.id.accessibilityActionContextClick: {
                  if (isContextClickable()) {
                      performContextClick();
                      return true;
                  }
              } break;
              case R.id.accessibilityActionShowTooltip: {
                  if ((mTooltipInfo != null) && (mTooltipInfo.mTooltipPopup != null)) {
                      // Tooltip already showing
                      return false;
                  }
                  return showLongClickTooltip(0, 0);
              }
              case R.id.accessibilityActionHideTooltip: {
                  if ((mTooltipInfo == null) || (mTooltipInfo.mTooltipPopup == null)) {
                      // No tooltip showing
                      return false;
                  }
                  hideTooltip();
                  return true;
              }
          }
          return false;
      }
  
      private boolean traverseAtGranularity(int granularity, boolean forward,
              boolean extendSelection) {
          CharSequence text = getIterableTextForAccessibility();
          if (text == null || text.length() == 0) {
              return false;
          }
          TextSegmentIterator iterator = getIteratorForGranularity(granularity);
          if (iterator == null) {
              return false;
          }
          int current = getAccessibilitySelectionEnd();
          if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) {
              current = forward ? 0 : text.length();
          }
          final int[] range = forward ? iterator.following(current) : iterator.preceding(current);
          if (range == null) {
              return false;
          }
          final int segmentStart = range[0];
          final int segmentEnd = range[1];
          int selectionStart;
          int selectionEnd;
          if (extendSelection && isAccessibilitySelectionExtendable()) {
              selectionStart = getAccessibilitySelectionStart();
              if (selectionStart == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) {
                  selectionStart = forward ? segmentStart : segmentEnd;
              }
              selectionEnd = forward ? segmentEnd : segmentStart;
          } else {
              selectionStart = selectionEnd= forward ? segmentEnd : segmentStart;
          }
          setAccessibilitySelection(selectionStart, selectionEnd);
          final int action = forward ? AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY
                  : AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY;
          sendViewTextTraversedAtGranularityEvent(action, granularity, segmentStart, segmentEnd);
          return true;
      }
  
      /**
       * Gets the text reported for accessibility purposes.
       *
       * @return The accessibility text.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public CharSequence getIterableTextForAccessibility() {
          return getContentDescription();
      }
  
      /**
       * Gets whether accessibility selection can be extended.
       *
       * @return If selection is extensible.
       *
       * @hide
       */
      public boolean isAccessibilitySelectionExtendable() {
          return false;
      }
  
      /**
       * @hide
       */
      public int getAccessibilitySelectionStart() {
          return mAccessibilityCursorPosition;
      }
  
      /**
       * @hide
       */
      public int getAccessibilitySelectionEnd() {
          return getAccessibilitySelectionStart();
      }
  
      /**
       * @hide
       */
      public void setAccessibilitySelection(int start, int end) {
          if (start ==  end && end == mAccessibilityCursorPosition) {
              return;
          }
          if (start >= 0 && start == end && end <= getIterableTextForAccessibility().length()) {
              mAccessibilityCursorPosition = start;
          } else {
              mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED;
          }
          sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED);
      }
  
      private void sendViewTextTraversedAtGranularityEvent(int action, int granularity,
              int fromIndex, int toIndex) {
          if (mParent == null) {
              return;
          }
          AccessibilityEvent event = AccessibilityEvent.obtain(
                  AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY);
          onInitializeAccessibilityEvent(event);
          onPopulateAccessibilityEvent(event);
          event.setFromIndex(fromIndex);
          event.setToIndex(toIndex);
          event.setAction(action);
          event.setMovementGranularity(granularity);
          mParent.requestSendAccessibilityEvent(this, event);
      }
  
      /**
       * @hide
       */
      @UnsupportedAppUsage
      public TextSegmentIterator getIteratorForGranularity(int granularity) {
          switch (granularity) {
              case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: {
                  CharSequence text = getIterableTextForAccessibility();
                  if (text != null && text.length() > 0) {
                      CharacterTextSegmentIterator iterator =
                          CharacterTextSegmentIterator.getInstance(
                                  mContext.getResources().getConfiguration().locale);
                      iterator.initialize(text.toString());
                      return iterator;
                  }
              } break;
              case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: {
                  CharSequence text = getIterableTextForAccessibility();
                  if (text != null && text.length() > 0) {
                      WordTextSegmentIterator iterator =
                          WordTextSegmentIterator.getInstance(
                                  mContext.getResources().getConfiguration().locale);
                      iterator.initialize(text.toString());
                      return iterator;
                  }
              } break;
              case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: {
                  CharSequence text = getIterableTextForAccessibility();
                  if (text != null && text.length() > 0) {
                      ParagraphTextSegmentIterator iterator =
                          ParagraphTextSegmentIterator.getInstance();
                      iterator.initialize(text.toString());
                      return iterator;
                  }
              } break;
          }
          return null;
      }
  
      /**
       * Tells whether the {@link View} is in the state between {@link #onStartTemporaryDetach()}
       * and {@link #onFinishTemporaryDetach()}.
       *
       * <p>This method always returns {@code true} when called directly or indirectly from
       * {@link #onStartTemporaryDetach()}. The return value when called directly or indirectly from
       * {@link #onFinishTemporaryDetach()}, however, depends on the OS version.
       * <ul>
       *     <li>{@code true} on {@link android.os.Build.VERSION_CODES#N API 24}</li>
       *     <li>{@code false} on {@link android.os.Build.VERSION_CODES#N_MR1 API 25}} and later</li>
       * </ul>
       * </p>
       *
       * @return {@code true} when the View is in the state between {@link #onStartTemporaryDetach()}
       * and {@link #onFinishTemporaryDetach()}.
       */
      public final boolean isTemporarilyDetached() {
          return (mPrivateFlags3 & PFLAG3_TEMPORARY_DETACH) != 0;
      }
  
      /**
       * Dispatch {@link #onStartTemporaryDetach()} to this View and its direct children if this is
       * a container View.
       */
      @CallSuper
      public void dispatchStartTemporaryDetach() {
          mPrivateFlags3 |= PFLAG3_TEMPORARY_DETACH;
          notifyEnterOrExitForAutoFillIfNeeded(false);
          notifyAppearedOrDisappearedForContentCaptureIfNeeded(false);
          onStartTemporaryDetach();
      }
  
      /**
       * This is called when a container is going to temporarily detach a child, with
       * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}.
       * It will either be followed by {@link #onFinishTemporaryDetach()} or
       * {@link #onDetachedFromWindow()} when the container is done.
       */
      public void onStartTemporaryDetach() {
          removeUnsetPressCallback();
          mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT;
      }
  
      /**
       * Dispatch {@link #onFinishTemporaryDetach()} to this View and its direct children if this is
       * a container View.
       */
      @CallSuper
      public void dispatchFinishTemporaryDetach() {
          mPrivateFlags3 &= ~PFLAG3_TEMPORARY_DETACH;
          onFinishTemporaryDetach();
          if (hasWindowFocus() && hasFocus()) {
              notifyFocusChangeToInputMethodManager(true /* hasFocus */);
          }
          notifyEnterOrExitForAutoFillIfNeeded(true);
          notifyAppearedOrDisappearedForContentCaptureIfNeeded(true);
      }
  
      /**
       * Called after {@link #onStartTemporaryDetach} when the container is done
       * changing the view.
       */
      public void onFinishTemporaryDetach() {
      }
  
      /**
       * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState}
       * for this view's window.  Returns null if the view is not currently attached
       * to the window.  Normally you will not need to use this directly, but
       * just use the standard high-level event callbacks like
       * {@link #onKeyDown(int, KeyEvent)}.
       */
      public KeyEvent.DispatcherState getKeyDispatcherState() {
          return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null;
      }
  
      /**
       * Dispatch a key event before it is processed by any input method
       * associated with the view hierarchy.  This can be used to intercept
       * key events in special situations before the IME consumes them; a
       * typical example would be handling the BACK key to update the application's
       * UI instead of allowing the IME to see it and close itself.
       *
       * @param event The key event to be dispatched.
       * @return True if the event was handled, false otherwise.
       */
      public boolean dispatchKeyEventPreIme(KeyEvent event) {
          return onKeyPreIme(event.getKeyCode(), event);
      }
  
      /**
       * Dispatch a key event to the next view on the focus path. This path runs
       * from the top of the view tree down to the currently focused view. If this
       * view has focus, it will dispatch to itself. Otherwise it will dispatch
       * the next node down the focus path. This method also fires any key
       * listeners.
       *
       * @param event The key event to be dispatched.
       * @return True if the event was handled, false otherwise.
       */
      public boolean dispatchKeyEvent(KeyEvent event) {
          if (mInputEventConsistencyVerifier != null) {
              mInputEventConsistencyVerifier.onKeyEvent(event, 0);
          }
  
          // Give any attached key listener a first crack at the event.
          //noinspection SimplifiableIfStatement
          ListenerInfo li = mListenerInfo;
          if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED
                  && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) {
              return true;
          }
  
          if (event.dispatch(this, mAttachInfo != null
                  ? mAttachInfo.mKeyDispatchState : null, this)) {
              return true;
          }
  
          if (mInputEventConsistencyVerifier != null) {
              mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
          }
          return false;
      }
  
      /**
       * Dispatches a key shortcut event.
       *
       * @param event The key event to be dispatched.
       * @return True if the event was handled by the view, false otherwise.
       */
      public boolean dispatchKeyShortcutEvent(KeyEvent event) {
          return onKeyShortcut(event.getKeyCode(), event);
      }
  
      /**
       * Pass the touch screen motion event down to the target view, or this
       * view if it is the target.
       *
       * @param event The motion event to be dispatched.
       * @return True if the event was handled by the view, false otherwise.
       */
      public boolean dispatchTouchEvent(MotionEvent event) {
          // If the event should be handled by accessibility focus first.
          if (event.isTargetAccessibilityFocus()) {
              // We don't have focus or no virtual descendant has it, do not handle the event.
              if (!isAccessibilityFocusedViewOrHost()) {
                  return false;
              }
              // We have focus and got the event, then use normal event dispatch.
              event.setTargetAccessibilityFocus(false);
          }
  
          boolean result = false;
  
          if (mInputEventConsistencyVerifier != null) {
              mInputEventConsistencyVerifier.onTouchEvent(event, 0);
          }
  
          final int actionMasked = event.getActionMasked();
          if (actionMasked == MotionEvent.ACTION_DOWN) {
              // Defensive cleanup for new gesture
              stopNestedScroll();
          }
  
          if (onFilterTouchEventForSecurity(event)) {
              if ((mViewFlags & ENABLED_MASK) == ENABLED && handleScrollBarDragging(event)) {
                  result = true;
              }
              //noinspection SimplifiableIfStatement
              ListenerInfo li = mListenerInfo;
              if (li != null && li.mOnTouchListener != null
                      && (mViewFlags & ENABLED_MASK) == ENABLED
                      && li.mOnTouchListener.onTouch(this, event)) {
                  result = true;
              }
  
              if (!result && onTouchEvent(event)) {
                  result = true;
              }
          }
  
          if (!result && mInputEventConsistencyVerifier != null) {
              mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
          }
  
          // Clean up after nested scrolls if this is the end of a gesture;
          // also cancel it if we tried an ACTION_DOWN but we didn't want the rest
          // of the gesture.
          if (actionMasked == MotionEvent.ACTION_UP ||
                  actionMasked == MotionEvent.ACTION_CANCEL ||
                  (actionMasked == MotionEvent.ACTION_DOWN && !result)) {
              stopNestedScroll();
          }
  
          return result;
      }
  
      boolean isAccessibilityFocusedViewOrHost() {
          return isAccessibilityFocused() || (getViewRootImpl() != null && getViewRootImpl()
                  .getAccessibilityFocusedHost() == this);
      }
  
      /**
       * Returns whether this view can receive pointer events.
       *
       * @return {@code true} if this view can receive pointer events.
       * @hide
       */
      protected boolean canReceivePointerEvents() {
          return (mViewFlags & VISIBILITY_MASK) == VISIBLE || getAnimation() != null;
      }
  
      /**
       * Filter the touch event to apply security policies.
       *
       * @param event The motion event to be filtered.
       * @return True if the event should be dispatched, false if the event should be dropped.
       *
       * @see #getFilterTouchesWhenObscured
       */
      public boolean onFilterTouchEventForSecurity(MotionEvent event) {
          //noinspection RedundantIfStatement
          if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0
                  && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) {
              // Window is obscured, drop this touch.
              return false;
          }
          return true;
      }
  
      /**
       * Pass a trackball motion event down to the focused view.
       *
       * @param event The motion event to be dispatched.
       * @return True if the event was handled by the view, false otherwise.
       */
      public boolean dispatchTrackballEvent(MotionEvent event) {
          if (mInputEventConsistencyVerifier != null) {
              mInputEventConsistencyVerifier.onTrackballEvent(event, 0);
          }
  
          return onTrackballEvent(event);
      }
  
      /**
       * Pass a captured pointer event down to the focused view.
       *
       * @param event The motion event to be dispatched.
       * @return True if the event was handled by the view, false otherwise.
       */
      public boolean dispatchCapturedPointerEvent(MotionEvent event) {
          if (!hasPointerCapture()) {
              return false;
          }
          //noinspection SimplifiableIfStatement
          ListenerInfo li = mListenerInfo;
          if (li != null && li.mOnCapturedPointerListener != null
                  && li.mOnCapturedPointerListener.onCapturedPointer(this, event)) {
              return true;
          }
          return onCapturedPointerEvent(event);
      }
  
      /**
       * Dispatch a generic motion event.
       * <p>
       * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER}
       * are delivered to the view under the pointer.  All other generic motion events are
       * delivered to the focused view.  Hover events are handled specially and are delivered
       * to {@link #onHoverEvent(MotionEvent)}.
       * </p>
       *
       * @param event The motion event to be dispatched.
       * @return True if the event was handled by the view, false otherwise.
       */
      public boolean dispatchGenericMotionEvent(MotionEvent event) {
          if (mInputEventConsistencyVerifier != null) {
              mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0);
          }
  
          final int source = event.getSource();
          if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) {
              final int action = event.getAction();
              if (action == MotionEvent.ACTION_HOVER_ENTER
                      || action == MotionEvent.ACTION_HOVER_MOVE
                      || action == MotionEvent.ACTION_HOVER_EXIT) {
                  if (dispatchHoverEvent(event)) {
                      return true;
                  }
              } else if (dispatchGenericPointerEvent(event)) {
                  return true;
              }
          } else if (dispatchGenericFocusedEvent(event)) {
              return true;
          }
  
          if (dispatchGenericMotionEventInternal(event)) {
              return true;
          }
  
          if (mInputEventConsistencyVerifier != null) {
              mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
          }
          return false;
      }
  
      private boolean dispatchGenericMotionEventInternal(MotionEvent event) {
          //noinspection SimplifiableIfStatement
          ListenerInfo li = mListenerInfo;
          if (li != null && li.mOnGenericMotionListener != null
                  && (mViewFlags & ENABLED_MASK) == ENABLED
                  && li.mOnGenericMotionListener.onGenericMotion(this, event)) {
              return true;
          }
  
          if (onGenericMotionEvent(event)) {
              return true;
          }
  
          final int actionButton = event.getActionButton();
          switch (event.getActionMasked()) {
              case MotionEvent.ACTION_BUTTON_PRESS:
                  if (isContextClickable() && !mInContextButtonPress && !mHasPerformedLongPress
                          && (actionButton == MotionEvent.BUTTON_STYLUS_PRIMARY
                          || actionButton == MotionEvent.BUTTON_SECONDARY)) {
                      if (performContextClick(event.getX(), event.getY())) {
                          mInContextButtonPress = true;
                          setPressed(true, event.getX(), event.getY());
                          removeTapCallback();
                          removeLongPressCallback();
                          return true;
                      }
                  }
                  break;
  
              case MotionEvent.ACTION_BUTTON_RELEASE:
                  if (mInContextButtonPress && (actionButton == MotionEvent.BUTTON_STYLUS_PRIMARY
                          || actionButton == MotionEvent.BUTTON_SECONDARY)) {
                      mInContextButtonPress = false;
                      mIgnoreNextUpEvent = true;
                  }
                  break;
          }
  
          if (mInputEventConsistencyVerifier != null) {
              mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
          }
          return false;
      }
  
      /**
       * Dispatch a hover event.
       * <p>
       * Do not call this method directly.
       * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead.
       * </p>
       *
       * @param event The motion event to be dispatched.
       * @return True if the event was handled by the view, false otherwise.
       */
      protected boolean dispatchHoverEvent(MotionEvent event) {
          ListenerInfo li = mListenerInfo;
          //noinspection SimplifiableIfStatement
          if (li != null && li.mOnHoverListener != null
                  && (mViewFlags & ENABLED_MASK) == ENABLED
                  && li.mOnHoverListener.onHover(this, event)) {
              return true;
          }
  
          return onHoverEvent(event);
      }
  
      /**
       * Returns true if the view has a child to which it has recently sent
       * {@link MotionEvent#ACTION_HOVER_ENTER}.  If this view is hovered and
       * it does not have a hovered child, then it must be the innermost hovered view.
       * @hide
       */
      protected boolean hasHoveredChild() {
          return false;
      }
  
      /**
       * Returns true if the given point, in local coordinates, is inside the hovered child.
       *
       * @hide
       */
      protected boolean pointInHoveredChild(MotionEvent event) {
          return false;
      }
  
      /**
       * Dispatch a generic motion event to the view under the first pointer.
       * <p>
       * Do not call this method directly.
       * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead.
       * </p>
       *
       * @param event The motion event to be dispatched.
       * @return True if the event was handled by the view, false otherwise.
       */
      protected boolean dispatchGenericPointerEvent(MotionEvent event) {
          return false;
      }
  
      /**
       * Dispatch a generic motion event to the currently focused view.
       * <p>
       * Do not call this method directly.
       * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead.
       * </p>
       *
       * @param event The motion event to be dispatched.
       * @return True if the event was handled by the view, false otherwise.
       */
      protected boolean dispatchGenericFocusedEvent(MotionEvent event) {
          return false;
      }
  
      /**
       * Dispatch a pointer event.
       * <p>
       * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all
       * other events to {@link #onGenericMotionEvent(MotionEvent)}.  This separation of concerns
       * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches
       * and should not be expected to handle other pointing device features.
       * </p>
       *
       * @param event The motion event to be dispatched.
       * @return True if the event was handled by the view, false otherwise.
       * @hide
       */
      @UnsupportedAppUsage
      public final boolean dispatchPointerEvent(MotionEvent event) {
          if (event.isTouchEvent()) {
              return dispatchTouchEvent(event);
          } else {
              return dispatchGenericMotionEvent(event);
          }
      }
  
      /**
       * Called when the window containing this view gains or loses window focus.
       * ViewGroups should override to route to their children.
       *
       * @param hasFocus True if the window containing this view now has focus,
       *        false otherwise.
       */
      public void dispatchWindowFocusChanged(boolean hasFocus) {
          onWindowFocusChanged(hasFocus);
      }
  
      /**
       * Called when the window containing this view gains or loses focus.  Note
       * that this is separate from view focus: to receive key events, both
       * your view and its window must have focus.  If a window is displayed
       * on top of yours that takes input focus, then your own window will lose
       * focus but the view focus will remain unchanged.
       *
       * @param hasWindowFocus True if the window containing this view now has
       *        focus, false otherwise.
       */
      public void onWindowFocusChanged(boolean hasWindowFocus) {
          if (!hasWindowFocus) {
              if (isPressed()) {
                  setPressed(false);
              }
              mPrivateFlags3 &= ~PFLAG3_FINGER_DOWN;
              if ((mPrivateFlags & PFLAG_FOCUSED) != 0) {
                  notifyFocusChangeToInputMethodManager(false /* hasFocus */);
              }
              removeLongPressCallback();
              removeTapCallback();
              onFocusLost();
          } else if ((mPrivateFlags & PFLAG_FOCUSED) != 0) {
              notifyFocusChangeToInputMethodManager(true /* hasFocus */);
          }
  
          refreshDrawableState();
      }
  
      /**
       * Returns true if this view is in a window that currently has window focus.
       * Note that this is not the same as the view itself having focus.
       *
       * @return True if this view is in a window that currently has window focus.
       */
      public boolean hasWindowFocus() {
          return mAttachInfo != null && mAttachInfo.mHasWindowFocus;
      }
  
      /**
       * Dispatch a view visibility change down the view hierarchy.
       * ViewGroups should override to route to their children.
       * @param changedView The view whose visibility changed. Could be 'this' or
       * an ancestor view.
       * @param visibility The new visibility of changedView: {@link #VISIBLE},
       * {@link #INVISIBLE} or {@link #GONE}.
       */
      protected void dispatchVisibilityChanged(@NonNull View changedView,
              @Visibility int visibility) {
          onVisibilityChanged(changedView, visibility);
      }
  
      /**
       * Called when the visibility of the view or an ancestor of the view has
       * changed.
       *
       * @param changedView The view whose visibility changed. May be
       *                    {@code this} or an ancestor view.
       * @param visibility The new visibility, one of {@link #VISIBLE},
       *                   {@link #INVISIBLE} or {@link #GONE}.
       */
      protected void onVisibilityChanged(@NonNull View changedView, @Visibility int visibility) {
      }
  
      /**
       * Dispatch a hint about whether this view is displayed. For instance, when
       * a View moves out of the screen, it might receives a display hint indicating
       * the view is not displayed. Applications should not <em>rely</em> on this hint
       * as there is no guarantee that they will receive one.
       *
       * @param hint A hint about whether or not this view is displayed:
       * {@link #VISIBLE} or {@link #INVISIBLE}.
       */
      public void dispatchDisplayHint(@Visibility int hint) {
          onDisplayHint(hint);
      }
  
      /**
       * Gives this view a hint about whether is displayed or not. For instance, when
       * a View moves out of the screen, it might receives a display hint indicating
       * the view is not displayed. Applications should not <em>rely</em> on this hint
       * as there is no guarantee that they will receive one.
       *
       * @param hint A hint about whether or not this view is displayed:
       * {@link #VISIBLE} or {@link #INVISIBLE}.
       */
      protected void onDisplayHint(@Visibility int hint) {
      }
  
      /**
       * Dispatch a window visibility change down the view hierarchy.
       * ViewGroups should override to route to their children.
       *
       * @param visibility The new visibility of the window.
       *
       * @see #onWindowVisibilityChanged(int)
       */
      public void dispatchWindowVisibilityChanged(@Visibility int visibility) {
          onWindowVisibilityChanged(visibility);
      }
  
      /**
       * Called when the window containing has change its visibility
       * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}).  Note
       * that this tells you whether or not your window is being made visible
       * to the window manager; this does <em>not</em> tell you whether or not
       * your window is obscured by other windows on the screen, even if it
       * is itself visible.
       *
       * @param visibility The new visibility of the window.
       */
      protected void onWindowVisibilityChanged(@Visibility int visibility) {
          if (visibility == VISIBLE) {
              initialAwakenScrollBars();
          }
      }
  
      /**
       * @return true if this view and all ancestors are visible as of the last
       * {@link #onVisibilityAggregated(boolean)} call.
       */
      boolean isAggregatedVisible() {
          return (mPrivateFlags3 & PFLAG3_AGGREGATED_VISIBLE) != 0;
      }
  
      /**
       * Internal dispatching method for {@link #onVisibilityAggregated}. Overridden by
       * ViewGroup. Intended to only be called when {@link #isAttachedToWindow()},
       * {@link #getWindowVisibility()} is {@link #VISIBLE} and this view's parent {@link #isShown()}.
       *
       * @param isVisible true if this view's visibility to the user is uninterrupted by its
       *                  ancestors or by window visibility
       * @return true if this view is visible to the user, not counting clipping or overlapping
       */
      boolean dispatchVisibilityAggregated(boolean isVisible) {
          final boolean thisVisible = getVisibility() == VISIBLE;
          // If we're not visible but something is telling us we are, ignore it.
          if (thisVisible || !isVisible) {
              onVisibilityAggregated(isVisible);
          }
          return thisVisible && isVisible;
      }
  
      /**
       * Called when the user-visibility of this View is potentially affected by a change
       * to this view itself, an ancestor view or the window this view is attached to.
       *
       * @param isVisible true if this view and all of its ancestors are {@link #VISIBLE}
       *                  and this view's window is also visible
       */
      @CallSuper
      public void onVisibilityAggregated(boolean isVisible) {
          // Update our internal visibility tracking so we can detect changes
          boolean oldVisible = isAggregatedVisible();
          mPrivateFlags3 = isVisible ? (mPrivateFlags3 | PFLAG3_AGGREGATED_VISIBLE)
                  : (mPrivateFlags3 & ~PFLAG3_AGGREGATED_VISIBLE);
          if (isVisible && mAttachInfo != null) {
              initialAwakenScrollBars();
          }
  
          final Drawable dr = mBackground;
          if (dr != null && isVisible != dr.isVisible()) {
              dr.setVisible(isVisible, false);
          }
          final Drawable hl = mDefaultFocusHighlight;
          if (hl != null && isVisible != hl.isVisible()) {
              hl.setVisible(isVisible, false);
          }
          final Drawable fg = mForegroundInfo != null ? mForegroundInfo.mDrawable : null;
          if (fg != null && isVisible != fg.isVisible()) {
              fg.setVisible(isVisible, false);
          }
  
          if (isAutofillable()) {
              AutofillManager afm = getAutofillManager();
  
              if (afm != null && getAutofillViewId() > LAST_APP_AUTOFILL_ID) {
                  if (mVisibilityChangeForAutofillHandler != null) {
                      mVisibilityChangeForAutofillHandler.removeMessages(0);
                  }
  
                  // If the view is in the background but still part of the hierarchy this is called
                  // with isVisible=false. Hence visibility==false requires further checks
                  if (isVisible) {
                      afm.notifyViewVisibilityChanged(this, true);
                  } else {
                      if (mVisibilityChangeForAutofillHandler == null) {
                          mVisibilityChangeForAutofillHandler =
                                  new VisibilityChangeForAutofillHandler(afm, this);
                      }
                      // Let current operation (e.g. removal of the view from the hierarchy)
                      // finish before checking state
                      mVisibilityChangeForAutofillHandler.obtainMessage(0, this).sendToTarget();
                  }
              }
          }
          if (isAccessibilityPane()) {
              if (isVisible != oldVisible) {
                  notifyViewAccessibilityStateChangedIfNeeded(isVisible
                          ? AccessibilityEvent.CONTENT_CHANGE_TYPE_PANE_APPEARED
                          : AccessibilityEvent.CONTENT_CHANGE_TYPE_PANE_DISAPPEARED);
              }
          }
  
          notifyAppearedOrDisappearedForContentCaptureIfNeeded(isVisible);
          if (!getSystemGestureExclusionRects().isEmpty() && isVisible != oldVisible) {
              postUpdateSystemGestureExclusionRects();
          }
      }
  
      /**
       * Returns the current visibility of the window this view is attached to
       * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}).
       *
       * @return Returns the current visibility of the view's window.
       */
      @Visibility
      public int getWindowVisibility() {
          return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE;
      }
  
      /**
       * Retrieve the overall visible display size in which the window this view is
       * attached to has been positioned in.  This takes into account screen
       * decorations above the window, for both cases where the window itself
       * is being position inside of them or the window is being placed under
       * then and covered insets are used for the window to position its content
       * inside.  In effect, this tells you the available area where content can
       * be placed and remain visible to users.
       *
       * <p>This function requires an IPC back to the window manager to retrieve
       * the requested information, so should not be used in performance critical
       * code like drawing.
       *
       * @param outRect Filled in with the visible display frame.  If the view
       * is not attached to a window, this is simply the raw display size.
       */
      public void getWindowVisibleDisplayFrame(Rect outRect) {
          if (mAttachInfo != null) {
              try {
                  mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect);
              } catch (RemoteException e) {
                  return;
              }
              // XXX This is really broken, and probably all needs to be done
              // in the window manager, and we need to know more about whether
              // we want the area behind or in front of the IME.
              final Rect insets = mAttachInfo.mVisibleInsets;
              outRect.left += insets.left;
              outRect.top += insets.top;
              outRect.right -= insets.right;
              outRect.bottom -= insets.bottom;
              return;
          }
          // The view is not attached to a display so we don't have a context.
          // Make a best guess about the display size.
          Display d = DisplayManagerGlobal.getInstance().getRealDisplay(Display.DEFAULT_DISPLAY);
          d.getRectSize(outRect);
      }
  
      /**
       * Like {@link #getWindowVisibleDisplayFrame}, but returns the "full" display frame this window
       * is currently in without any insets.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public void getWindowDisplayFrame(Rect outRect) {
          if (mAttachInfo != null) {
              try {
                  mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect);
              } catch (RemoteException e) {
                  return;
              }
              return;
          }
          // The view is not attached to a display so we don't have a context.
          // Make a best guess about the display size.
          Display d = DisplayManagerGlobal.getInstance().getRealDisplay(Display.DEFAULT_DISPLAY);
          d.getRectSize(outRect);
      }
  
      /**
       * Dispatch a notification about a resource configuration change down
       * the view hierarchy.
       * ViewGroups should override to route to their children.
       *
       * @param newConfig The new resource configuration.
       *
       * @see #onConfigurationChanged(android.content.res.Configuration)
       */
      public void dispatchConfigurationChanged(Configuration newConfig) {
          onConfigurationChanged(newConfig);
      }
  
      /**
       * Called when the current configuration of the resources being used
       * by the application have changed.  You can use this to decide when
       * to reload resources that can changed based on orientation and other
       * configuration characteristics.  You only need to use this if you are
       * not relying on the normal {@link android.app.Activity} mechanism of
       * recreating the activity instance upon a configuration change.
       *
       * @param newConfig The new resource configuration.
       */
      protected void onConfigurationChanged(Configuration newConfig) {
      }
  
      /**
       * Private function to aggregate all per-view attributes in to the view
       * root.
       */
      void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) {
          performCollectViewAttributes(attachInfo, visibility);
      }
  
      void performCollectViewAttributes(AttachInfo attachInfo, int visibility) {
          if ((visibility & VISIBILITY_MASK) == VISIBLE) {
              if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) {
                  attachInfo.mKeepScreenOn = true;
              }
              attachInfo.mSystemUiVisibility |= mSystemUiVisibility;
              ListenerInfo li = mListenerInfo;
              if (li != null && li.mOnSystemUiVisibilityChangeListener != null) {
                  attachInfo.mHasSystemUiListeners = true;
              }
          }
      }
  
      void needGlobalAttributesUpdate(boolean force) {
          final AttachInfo ai = mAttachInfo;
          if (ai != null && !ai.mRecomputeGlobalAttributes) {
              if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0)
                      || ai.mHasSystemUiListeners) {
                  ai.mRecomputeGlobalAttributes = true;
              }
          }
      }
  
      /**
       * Returns whether the device is currently in touch mode.  Touch mode is entered
       * once the user begins interacting with the device by touch, and affects various
       * things like whether focus is always visible to the user.
       *
       * @return Whether the device is in touch mode.
       */
      @ViewDebug.ExportedProperty
      public boolean isInTouchMode() {
          if (mAttachInfo != null) {
              return mAttachInfo.mInTouchMode;
          } else {
              return ViewRootImpl.isInTouchMode();
          }
      }
  
      /**
       * Returns the context the view is running in, through which it can
       * access the current theme, resources, etc.
       *
       * @return The view's Context.
       */
      @ViewDebug.CapturedViewProperty
      public final Context getContext() {
          return mContext;
      }
  
      /**
       * Handle a key event before it is processed by any input method
       * associated with the view hierarchy.  This can be used to intercept
       * key events in special situations before the IME consumes them; a
       * typical example would be handling the BACK key to update the application's
       * UI instead of allowing the IME to see it and close itself.
       *
       * @param keyCode The value in event.getKeyCode().
       * @param event Description of the key event.
       * @return If you handled the event, return true. If you want to allow the
       *         event to be handled by the next receiver, return false.
       */
      public boolean onKeyPreIme(int keyCode, KeyEvent event) {
          return false;
      }
  
      /**
       * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent)
       * KeyEvent.Callback.onKeyDown()}: perform press of the view
       * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER}
       * is released, if the view is enabled and clickable.
       * <p>
       * Key presses in software keyboards will generally NOT trigger this
       * listener, although some may elect to do so in some situations. Do not
       * rely on this to catch software key presses.
       *
       * @param keyCode a key code that represents the button pressed, from
       *                {@link android.view.KeyEvent}
       * @param event the KeyEvent object that defines the button action
       */
      public boolean onKeyDown(int keyCode, KeyEvent event) {
          if (KeyEvent.isConfirmKey(keyCode)) {
              if ((mViewFlags & ENABLED_MASK) == DISABLED) {
                  return true;
              }
  
              if (event.getRepeatCount() == 0) {
                  // Long clickable items don't necessarily have to be clickable.
                  final boolean clickable = (mViewFlags & CLICKABLE) == CLICKABLE
                          || (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE;
                  if (clickable || (mViewFlags & TOOLTIP) == TOOLTIP) {
                      // For the purposes of menu anchoring and drawable hotspots,
                      // key events are considered to be at the center of the view.
                      final float x = getWidth() / 2f;
                      final float y = getHeight() / 2f;
                      if (clickable) {
                          setPressed(true, x, y);
                      }
                      checkForLongClick(
                              ViewConfiguration.getLongPressTimeout(),
                              x,
                              y,
                              // This is not a touch gesture -- do not classify it as one.
                              TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__UNKNOWN_CLASSIFICATION);
                      return true;
                  }
              }
          }
  
          return false;
      }
  
      /**
       * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent)
       * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle
       * the event).
       * <p>Key presses in software keyboards will generally NOT trigger this listener,
       * although some may elect to do so in some situations. Do not rely on this to
       * catch software key presses.
       */
      public boolean onKeyLongPress(int keyCode, KeyEvent event) {
          return false;
      }
  
      /**
       * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent)
       * KeyEvent.Callback.onKeyUp()}: perform clicking of the view
       * when {@link KeyEvent#KEYCODE_DPAD_CENTER}, {@link KeyEvent#KEYCODE_ENTER}
       * or {@link KeyEvent#KEYCODE_SPACE} is released.
       * <p>Key presses in software keyboards will generally NOT trigger this listener,
       * although some may elect to do so in some situations. Do not rely on this to
       * catch software key presses.
       *
       * @param keyCode A key code that represents the button pressed, from
       *                {@link android.view.KeyEvent}.
       * @param event   The KeyEvent object that defines the button action.
       */
      public boolean onKeyUp(int keyCode, KeyEvent event) {
          if (KeyEvent.isConfirmKey(keyCode)) {
              if ((mViewFlags & ENABLED_MASK) == DISABLED) {
                  return true;
              }
              if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) {
                  setPressed(false);
  
                  if (!mHasPerformedLongPress) {
                      // This is a tap, so remove the longpress check
                      removeLongPressCallback();
                      if (!event.isCanceled()) {
                          return performClickInternal();
                      }
                  }
              }
          }
          return false;
      }
  
      /**
       * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent)
       * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle
       * the event).
       * <p>Key presses in software keyboards will generally NOT trigger this listener,
       * although some may elect to do so in some situations. Do not rely on this to
       * catch software key presses.
       *
       * @param keyCode     A key code that represents the button pressed, from
       *                    {@link android.view.KeyEvent}.
       * @param repeatCount The number of times the action was made.
       * @param event       The KeyEvent object that defines the button action.
       */
      public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {
          return false;
      }
  
      /**
       * Called on the focused view when a key shortcut event is not handled.
       * Override this method to implement local key shortcuts for the View.
       * Key shortcuts can also be implemented by setting the
       * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items.
       *
       * @param keyCode The value in event.getKeyCode().
       * @param event Description of the key event.
       * @return If you handled the event, return true. If you want to allow the
       *         event to be handled by the next receiver, return false.
       */
      public boolean onKeyShortcut(int keyCode, KeyEvent event) {
          return false;
      }
  
      /**
       * Check whether the called view is a text editor, in which case it
       * would make sense to automatically display a soft input window for
       * it.  Subclasses should override this if they implement
       * {@link #onCreateInputConnection(EditorInfo)} to return true if
       * a call on that method would return a non-null InputConnection, and
       * they are really a first-class editor that the user would normally
       * start typing on when the go into a window containing your view.
       *
       * <p>The default implementation always returns false.  This does
       * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)}
       * will not be called or the user can not otherwise perform edits on your
       * view; it is just a hint to the system that this is not the primary
       * purpose of this view.
       *
       * @return Returns true if this view is a text editor, else false.
       */
      public boolean onCheckIsTextEditor() {
          return false;
      }
  
      /**
       * Create a new InputConnection for an InputMethod to interact
       * with the view.  The default implementation returns null, since it doesn't
       * support input methods.  You can override this to implement such support.
       * This is only needed for views that take focus and text input.
       *
       * <p>When implementing this, you probably also want to implement
       * {@link #onCheckIsTextEditor()} to indicate you will return a
       * non-null InputConnection.</p>
       *
       * <p>Also, take good care to fill in the {@link android.view.inputmethod.EditorInfo}
       * object correctly and in its entirety, so that the connected IME can rely
       * on its values. For example, {@link android.view.inputmethod.EditorInfo#initialSelStart}
       * and  {@link android.view.inputmethod.EditorInfo#initialSelEnd} members
       * must be filled in with the correct cursor position for IMEs to work correctly
       * with your application.</p>
       *
       * @param outAttrs Fill in with attribute information about the connection.
       */
      public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
          return null;
      }
  
      /**
       * Called by the {@link android.view.inputmethod.InputMethodManager}
       * when a view who is not the current
       * input connection target is trying to make a call on the manager.  The
       * default implementation returns false; you can override this to return
       * true for certain views if you are performing InputConnection proxying
       * to them.
       * @param view The View that is making the InputMethodManager call.
       * @return Return true to allow the call, false to reject.
       */
      public boolean checkInputConnectionProxy(View view) {
          return false;
      }
  
      /**
       * Show the context menu for this view. It is not safe to hold on to the
       * menu after returning from this method.
       *
       * You should normally not overload this method. Overload
       * {@link #onCreateContextMenu(ContextMenu)} or define an
       * {@link OnCreateContextMenuListener} to add items to the context menu.
       *
       * @param menu The context menu to populate
       */
      public void createContextMenu(ContextMenu menu) {
          ContextMenuInfo menuInfo = getContextMenuInfo();
  
          // Sets the current menu info so all items added to menu will have
          // my extra info set.
          ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo);
  
          onCreateContextMenu(menu);
          ListenerInfo li = mListenerInfo;
          if (li != null && li.mOnCreateContextMenuListener != null) {
              li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo);
          }
  
          // Clear the extra information so subsequent items that aren't mine don't
          // have my extra info.
          ((MenuBuilder)menu).setCurrentMenuInfo(null);
  
          if (mParent != null) {
              mParent.createContextMenu(menu);
          }
      }
  
      /**
       * Views should implement this if they have extra information to associate
       * with the context menu. The return result is supplied as a parameter to
       * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)}
       * callback.
       *
       * @return Extra information about the item for which the context menu
       *         should be shown. This information will vary across different
       *         subclasses of View.
       */
      protected ContextMenuInfo getContextMenuInfo() {
          return null;
      }
  
      /**
       * Views should implement this if the view itself is going to add items to
       * the context menu.
       *
       * @param menu the context menu to populate
       */
      protected void onCreateContextMenu(ContextMenu menu) {
      }
  
      /**
       * Implement this method to handle trackball motion events.  The
       * <em>relative</em> movement of the trackball since the last event
       * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and
       * {@link MotionEvent#getY MotionEvent.getY()}.  These are normalized so
       * that a movement of 1 corresponds to the user pressing one DPAD key (so
       * they will often be fractional values, representing the more fine-grained
       * movement information available from a trackball).
       *
       * @param event The motion event.
       * @return True if the event was handled, false otherwise.
       */
      public boolean onTrackballEvent(MotionEvent event) {
          return false;
      }
  
      /**
       * Implement this method to handle generic motion events.
       * <p>
       * Generic motion events describe joystick movements, mouse hovers, track pad
       * touches, scroll wheel movements and other input events.  The
       * {@link MotionEvent#getSource() source} of the motion event specifies
       * the class of input that was received.  Implementations of this method
       * must examine the bits in the source before processing the event.
       * The following code example shows how this is done.
       * </p><p>
       * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER}
       * are delivered to the view under the pointer.  All other generic motion events are
       * delivered to the focused view.
       * </p>
       * <pre> public boolean onGenericMotionEvent(MotionEvent event) {
       *     if (event.isFromSource(InputDevice.SOURCE_CLASS_JOYSTICK)) {
       *         if (event.getAction() == MotionEvent.ACTION_MOVE) {
       *             // process the joystick movement...
       *             return true;
       *         }
       *     }
       *     if (event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) {
       *         switch (event.getAction()) {
       *             case MotionEvent.ACTION_HOVER_MOVE:
       *                 // process the mouse hover movement...
       *                 return true;
       *             case MotionEvent.ACTION_SCROLL:
       *                 // process the scroll wheel movement...
       *                 return true;
       *         }
       *     }
       *     return super.onGenericMotionEvent(event);
       * }</pre>
       *
       * @param event The generic motion event being processed.
       * @return True if the event was handled, false otherwise.
       */
      public boolean onGenericMotionEvent(MotionEvent event) {
          return false;
      }
  
      /**
       * Dispatching hover events to {@link TouchDelegate} to improve accessibility.
       * <p>
       * This method is dispatching hover events to the delegate target to support explore by touch.
       * Similar to {@link ViewGroup#dispatchTouchEvent}, this method send proper hover events to
       * the delegate target according to the pointer and the touch area of the delegate while touch
       * exploration enabled.
       * </p>
       *
       * @param event The motion event dispatch to the delegate target.
       * @return True if the event was handled, false otherwise.
       *
       * @see #onHoverEvent
       */
      private boolean dispatchTouchExplorationHoverEvent(MotionEvent event) {
          final AccessibilityManager manager = AccessibilityManager.getInstance(mContext);
          if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) {
              return false;
          }
  
          final boolean oldHoveringTouchDelegate = mHoveringTouchDelegate;
          final int action = event.getActionMasked();
          boolean pointInDelegateRegion = false;
          boolean handled = false;
  
          final AccessibilityNodeInfo.TouchDelegateInfo info = mTouchDelegate.getTouchDelegateInfo();
          for (int i = 0; i < info.getRegionCount(); i++) {
              Region r = info.getRegionAt(i);
              if (r.contains((int) event.getX(), (int) event.getY())) {
                  pointInDelegateRegion = true;
              }
          }
  
          // Explore by touch should dispatch events to children under the pointer first if any
          // before dispatching to TouchDelegate. For non-hoverable views that do not consume
          // hover events but receive accessibility focus, it should also not delegate to these
          // views when hovered.
          if (!oldHoveringTouchDelegate) {
              if ((action == MotionEvent.ACTION_HOVER_ENTER
                      || action == MotionEvent.ACTION_HOVER_MOVE)
                      && !pointInHoveredChild(event)
                      && pointInDelegateRegion) {
                  mHoveringTouchDelegate = true;
              }
          } else {
              if (action == MotionEvent.ACTION_HOVER_EXIT
                      || (action == MotionEvent.ACTION_HOVER_MOVE
                          && (pointInHoveredChild(event) || !pointInDelegateRegion))) {
                  mHoveringTouchDelegate = false;
              }
          }
          switch (action) {
              case MotionEvent.ACTION_HOVER_MOVE:
                  if (oldHoveringTouchDelegate && mHoveringTouchDelegate) {
                      // Inside bounds, dispatch as is.
                      handled = mTouchDelegate.onTouchExplorationHoverEvent(event);
                  } else if (!oldHoveringTouchDelegate && mHoveringTouchDelegate) {
                      // Moving inbound, synthesize hover enter.
                      MotionEvent eventNoHistory = (event.getHistorySize() == 0)
                              ? event : MotionEvent.obtainNoHistory(event);
                      eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER);
                      handled = mTouchDelegate.onTouchExplorationHoverEvent(eventNoHistory);
                      eventNoHistory.setAction(action);
                      handled |= mTouchDelegate.onTouchExplorationHoverEvent(eventNoHistory);
                  } else if (oldHoveringTouchDelegate && !mHoveringTouchDelegate) {
                      // Moving outbound, synthesize hover exit.
                      final boolean hoverExitPending = event.isHoverExitPending();
                      event.setHoverExitPending(true);
                      mTouchDelegate.onTouchExplorationHoverEvent(event);
                      MotionEvent eventNoHistory = (event.getHistorySize() == 0)
                              ? event : MotionEvent.obtainNoHistory(event);
                      eventNoHistory.setHoverExitPending(hoverExitPending);
                      eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT);
                      mTouchDelegate.onTouchExplorationHoverEvent(eventNoHistory);
                  }  // else: outside bounds, do nothing.
                  break;
              case MotionEvent.ACTION_HOVER_ENTER:
                  if (!oldHoveringTouchDelegate && mHoveringTouchDelegate) {
                      handled = mTouchDelegate.onTouchExplorationHoverEvent(event);
                  }
                  break;
              case MotionEvent.ACTION_HOVER_EXIT:
                  if (oldHoveringTouchDelegate) {
                      mTouchDelegate.onTouchExplorationHoverEvent(event);
                  }
                  break;
          }
          return handled;
      }
  
      /**
       * Implement this method to handle hover events.
       * <p>
       * This method is called whenever a pointer is hovering into, over, or out of the
       * bounds of a view and the view is not currently being touched.
       * Hover events are represented as pointer events with action
       * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE},
       * or {@link MotionEvent#ACTION_HOVER_EXIT}.
       * </p>
       * <ul>
       * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER}
       * when the pointer enters the bounds of the view.</li>
       * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE}
       * when the pointer has already entered the bounds of the view and has moved.</li>
       * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT}
       * when the pointer has exited the bounds of the view or when the pointer is
       * about to go down due to a button click, tap, or similar user action that
       * causes the view to be touched.</li>
       * </ul>
       * <p>
       * The view should implement this method to return true to indicate that it is
       * handling the hover event, such as by changing its drawable state.
       * </p><p>
       * The default implementation calls {@link #setHovered} to update the hovered state
       * of the view when a hover enter or hover exit event is received, if the view
       * is enabled and is clickable.  The default implementation also sends hover
       * accessibility events.
       * </p>
       *
       * @param event The motion event that describes the hover.
       * @return True if the view handled the hover event.
       *
       * @see #isHovered
       * @see #setHovered
       * @see #onHoverChanged
       */
      public boolean onHoverEvent(MotionEvent event) {
          if (mTouchDelegate != null && dispatchTouchExplorationHoverEvent(event)) {
              return true;
          }
  
          // The root view may receive hover (or touch) events that are outside the bounds of
          // the window.  This code ensures that we only send accessibility events for
          // hovers that are actually within the bounds of the root view.
          final int action = event.getActionMasked();
          if (!mSendingHoverAccessibilityEvents) {
              if ((action == MotionEvent.ACTION_HOVER_ENTER
                      || action == MotionEvent.ACTION_HOVER_MOVE)
                      && !hasHoveredChild()
                      && pointInView(event.getX(), event.getY())) {
                  sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER);
                  mSendingHoverAccessibilityEvents = true;
              }
          } else {
              if (action == MotionEvent.ACTION_HOVER_EXIT
                      || (action == MotionEvent.ACTION_HOVER_MOVE
                              && !pointInView(event.getX(), event.getY()))) {
                  mSendingHoverAccessibilityEvents = false;
                  sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT);
              }
          }
  
          if ((action == MotionEvent.ACTION_HOVER_ENTER || action == MotionEvent.ACTION_HOVER_MOVE)
                  && event.isFromSource(InputDevice.SOURCE_MOUSE)
                  && isOnScrollbar(event.getX(), event.getY())) {
              awakenScrollBars();
          }
  
          // If we consider ourself hoverable, or if we we're already hovered,
          // handle changing state in response to ENTER and EXIT events.
          if (isHoverable() || isHovered()) {
              switch (action) {
                  case MotionEvent.ACTION_HOVER_ENTER:
                      setHovered(true);
                      break;
                  case MotionEvent.ACTION_HOVER_EXIT:
                      setHovered(false);
                      break;
              }
  
              // Dispatch the event to onGenericMotionEvent before returning true.
              // This is to provide compatibility with existing applications that
              // handled HOVER_MOVE events in onGenericMotionEvent and that would
              // break because of the new default handling for hoverable views
              // in onHoverEvent.
              // Note that onGenericMotionEvent will be called by default when
              // onHoverEvent returns false (refer to dispatchGenericMotionEvent).
              dispatchGenericMotionEventInternal(event);
              // The event was already handled by calling setHovered(), so always
              // return true.
              return true;
          }
  
          return false;
      }
  
      /**
       * Returns true if the view should handle {@link #onHoverEvent}
       * by calling {@link #setHovered} to change its hovered state.
       *
       * @return True if the view is hoverable.
       */
      private boolean isHoverable() {
          final int viewFlags = mViewFlags;
          if ((viewFlags & ENABLED_MASK) == DISABLED) {
              return false;
          }
  
          return (viewFlags & CLICKABLE) == CLICKABLE
                  || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE
                  || (viewFlags & CONTEXT_CLICKABLE) == CONTEXT_CLICKABLE;
      }
  
      /**
       * Returns true if the view is currently hovered.
       *
       * @return True if the view is currently hovered.
       *
       * @see #setHovered
       * @see #onHoverChanged
       */
      @ViewDebug.ExportedProperty
      public boolean isHovered() {
          return (mPrivateFlags & PFLAG_HOVERED) != 0;
      }
  
      /**
       * Sets whether the view is currently hovered.
       * <p>
       * Calling this method also changes the drawable state of the view.  This
       * enables the view to react to hover by using different drawable resources
       * to change its appearance.
       * </p><p>
       * The {@link #onHoverChanged} method is called when the hovered state changes.
       * </p>
       *
       * @param hovered True if the view is hovered.
       *
       * @see #isHovered
       * @see #onHoverChanged
       */
      public void setHovered(boolean hovered) {
          if (hovered) {
              if ((mPrivateFlags & PFLAG_HOVERED) == 0) {
                  mPrivateFlags |= PFLAG_HOVERED;
                  refreshDrawableState();
                  onHoverChanged(true);
              }
          } else {
              if ((mPrivateFlags & PFLAG_HOVERED) != 0) {
                  mPrivateFlags &= ~PFLAG_HOVERED;
                  refreshDrawableState();
                  onHoverChanged(false);
              }
          }
      }
  
      /**
       * Implement this method to handle hover state changes.
       * <p>
       * This method is called whenever the hover state changes as a result of a
       * call to {@link #setHovered}.
       * </p>
       *
       * @param hovered The current hover state, as returned by {@link #isHovered}.
       *
       * @see #isHovered
       * @see #setHovered
       */
      public void onHoverChanged(boolean hovered) {
      }
  
      /**
       * Handles scroll bar dragging by mouse input.
       *
       * @hide
       * @param event The motion event.
       *
       * @return true if the event was handled as a scroll bar dragging, false otherwise.
       */
      protected boolean handleScrollBarDragging(MotionEvent event) {
          if (mScrollCache == null) {
              return false;
          }
          final float x = event.getX();
          final float y = event.getY();
          final int action = event.getAction();
          if ((mScrollCache.mScrollBarDraggingState == ScrollabilityCache.NOT_DRAGGING
                  && action != MotionEvent.ACTION_DOWN)
                      || !event.isFromSource(InputDevice.SOURCE_MOUSE)
                      || !event.isButtonPressed(MotionEvent.BUTTON_PRIMARY)) {
              mScrollCache.mScrollBarDraggingState = ScrollabilityCache.NOT_DRAGGING;
              return false;
          }
  
          switch (action) {
              case MotionEvent.ACTION_MOVE:
                  if (mScrollCache.mScrollBarDraggingState == ScrollabilityCache.NOT_DRAGGING) {
                      return false;
                  }
                  if (mScrollCache.mScrollBarDraggingState
                          == ScrollabilityCache.DRAGGING_VERTICAL_SCROLL_BAR) {
                      final Rect bounds = mScrollCache.mScrollBarBounds;
                      getVerticalScrollBarBounds(bounds, null);
                      final int range = computeVerticalScrollRange();
                      final int offset = computeVerticalScrollOffset();
                      final int extent = computeVerticalScrollExtent();
  
                      final int thumbLength = ScrollBarUtils.getThumbLength(
                              bounds.height(), bounds.width(), extent, range);
                      final int thumbOffset = ScrollBarUtils.getThumbOffset(
                              bounds.height(), thumbLength, extent, range, offset);
  
                      final float diff = y - mScrollCache.mScrollBarDraggingPos;
                      final float maxThumbOffset = bounds.height() - thumbLength;
                      final float newThumbOffset =
                              Math.min(Math.max(thumbOffset + diff, 0.0f), maxThumbOffset);
                      final int height = getHeight();
                      if (Math.round(newThumbOffset) != thumbOffset && maxThumbOffset > 0
                              && height > 0 && extent > 0) {
                          final int newY = Math.round((range - extent)
                                  / ((float)extent / height) * (newThumbOffset / maxThumbOffset));
                          if (newY != getScrollY()) {
                              mScrollCache.mScrollBarDraggingPos = y;
                              setScrollY(newY);
                          }
                      }
                      return true;
                  }
                  if (mScrollCache.mScrollBarDraggingState
                          == ScrollabilityCache.DRAGGING_HORIZONTAL_SCROLL_BAR) {
                      final Rect bounds = mScrollCache.mScrollBarBounds;
                      getHorizontalScrollBarBounds(bounds, null);
                      final int range = computeHorizontalScrollRange();
                      final int offset = computeHorizontalScrollOffset();
                      final int extent = computeHorizontalScrollExtent();
  
                      final int thumbLength = ScrollBarUtils.getThumbLength(
                              bounds.width(), bounds.height(), extent, range);
                      final int thumbOffset = ScrollBarUtils.getThumbOffset(
                              bounds.width(), thumbLength, extent, range, offset);
  
                      final float diff = x - mScrollCache.mScrollBarDraggingPos;
                      final float maxThumbOffset = bounds.width() - thumbLength;
                      final float newThumbOffset =
                              Math.min(Math.max(thumbOffset + diff, 0.0f), maxThumbOffset);
                      final int width = getWidth();
                      if (Math.round(newThumbOffset) != thumbOffset && maxThumbOffset > 0
                              && width > 0 && extent > 0) {
                          final int newX = Math.round((range - extent)
                                  / ((float)extent / width) * (newThumbOffset / maxThumbOffset));
                          if (newX != getScrollX()) {
                              mScrollCache.mScrollBarDraggingPos = x;
                              setScrollX(newX);
                          }
                      }
                      return true;
                  }
              case MotionEvent.ACTION_DOWN:
                  if (mScrollCache.state == ScrollabilityCache.OFF) {
                      return false;
                  }
                  if (isOnVerticalScrollbarThumb(x, y)) {
                      mScrollCache.mScrollBarDraggingState =
                              ScrollabilityCache.DRAGGING_VERTICAL_SCROLL_BAR;
                      mScrollCache.mScrollBarDraggingPos = y;
                      return true;
                  }
                  if (isOnHorizontalScrollbarThumb(x, y)) {
                      mScrollCache.mScrollBarDraggingState =
                              ScrollabilityCache.DRAGGING_HORIZONTAL_SCROLL_BAR;
                      mScrollCache.mScrollBarDraggingPos = x;
                      return true;
                  }
          }
          mScrollCache.mScrollBarDraggingState = ScrollabilityCache.NOT_DRAGGING;
          return false;
      }
  
      /**
       * Implement this method to handle touch screen motion events.
       * <p>
       * If this method is used to detect click actions, it is recommended that
       * the actions be performed by implementing and calling
       * {@link #performClick()}. This will ensure consistent system behavior,
       * including:
       * <ul>
       * <li>obeying click sound preferences
       * <li>dispatching OnClickListener calls
       * <li>handling {@link AccessibilityNodeInfo#ACTION_CLICK ACTION_CLICK} when
       * accessibility features are enabled
       * </ul>
       *
       * @param event The motion event.
       * @return True if the event was handled, false otherwise.
       */
      public boolean onTouchEvent(MotionEvent event) {
          final float x = event.getX();
          final float y = event.getY();
          final int viewFlags = mViewFlags;
          final int action = event.getAction();
  
          final boolean clickable = ((viewFlags & CLICKABLE) == CLICKABLE
                  || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)
                  || (viewFlags & CONTEXT_CLICKABLE) == CONTEXT_CLICKABLE;
  
          if ((viewFlags & ENABLED_MASK) == DISABLED) {
              if (action == MotionEvent.ACTION_UP && (mPrivateFlags & PFLAG_PRESSED) != 0) {
                  setPressed(false);
              }
              mPrivateFlags3 &= ~PFLAG3_FINGER_DOWN;
              // A disabled view that is clickable still consumes the touch
              // events, it just doesn't respond to them.
              return clickable;
          }
          if (mTouchDelegate != null) {
              if (mTouchDelegate.onTouchEvent(event)) {
                  return true;
              }
          }
  
          if (clickable || (viewFlags & TOOLTIP) == TOOLTIP) {
              switch (action) {
                  case MotionEvent.ACTION_UP:
                      mPrivateFlags3 &= ~PFLAG3_FINGER_DOWN;
                      if ((viewFlags & TOOLTIP) == TOOLTIP) {
                          handleTooltipUp();
                      }
                      if (!clickable) {
                          removeTapCallback();
                          removeLongPressCallback();
                          mInContextButtonPress = false;
                          mHasPerformedLongPress = false;
                          mIgnoreNextUpEvent = false;
                          break;
                      }
                      boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0;
                      if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) {
                          // take focus if we don't have it already and we should in
                          // touch mode.
                          boolean focusTaken = false;
                          if (isFocusable() && isFocusableInTouchMode() && !isFocused()) {
                              focusTaken = requestFocus();
                          }
  
                          if (prepressed) {
                              // The button is being released before we actually
                              // showed it as pressed.  Make it show the pressed
                              // state now (before scheduling the click) to ensure
                              // the user sees it.
                              setPressed(true, x, y);
                          }
  
                          if (!mHasPerformedLongPress && !mIgnoreNextUpEvent) {
                              // This is a tap, so remove the longpress check
                              removeLongPressCallback();
  
                              // Only perform take click actions if we were in the pressed state
                              if (!focusTaken) {
                                  // Use a Runnable and post this rather than calling
                                  // performClick directly. This lets other visual state
                                  // of the view update before click actions start.
                                  if (mPerformClick == null) {
                                      mPerformClick = new PerformClick();
                                  }
                                  if (!post(mPerformClick)) {
                                      performClickInternal();
                                  }
                              }
                          }
  
                          if (mUnsetPressedState == null) {
                              mUnsetPressedState = new UnsetPressedState();
                          }
  
                          if (prepressed) {
                              postDelayed(mUnsetPressedState,
                                      ViewConfiguration.getPressedStateDuration());
                          } else if (!post(mUnsetPressedState)) {
                              // If the post failed, unpress right now
                              mUnsetPressedState.run();
                          }
  
                          removeTapCallback();
                      }
                      mIgnoreNextUpEvent = false;
                      break;
  
                  case MotionEvent.ACTION_DOWN:
                      if (event.getSource() == InputDevice.SOURCE_TOUCHSCREEN) {
                          mPrivateFlags3 |= PFLAG3_FINGER_DOWN;
                      }
                      mHasPerformedLongPress = false;
  
                      if (!clickable) {
                          checkForLongClick(
                                  ViewConfiguration.getLongPressTimeout(),
                                  x,
                                  y,
                                  TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__LONG_PRESS);
                          break;
                      }
  
                      if (performButtonActionOnTouchDown(event)) {
                          break;
                      }
  
                      // Walk up the hierarchy to determine if we're inside a scrolling container.
                      boolean isInScrollingContainer = isInScrollingContainer();
  
                      // For views inside a scrolling container, delay the pressed feedback for
                      // a short period in case this is a scroll.
                      if (isInScrollingContainer) {
                          mPrivateFlags |= PFLAG_PREPRESSED;
                          if (mPendingCheckForTap == null) {
                              mPendingCheckForTap = new CheckForTap();
                          }
                          mPendingCheckForTap.x = event.getX();
                          mPendingCheckForTap.y = event.getY();
                          postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout());
                      } else {
                          // Not inside a scrolling container, so show the feedback right away
                          setPressed(true, x, y);
                          checkForLongClick(
                                  ViewConfiguration.getLongPressTimeout(),
                                  x,
                                  y,
                                  TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__LONG_PRESS);
                      }
                      break;
  
                  case MotionEvent.ACTION_CANCEL:
                      if (clickable) {
                          setPressed(false);
                      }
                      removeTapCallback();
                      removeLongPressCallback();
                      mInContextButtonPress = false;
                      mHasPerformedLongPress = false;
                      mIgnoreNextUpEvent = false;
                      mPrivateFlags3 &= ~PFLAG3_FINGER_DOWN;
                      break;
  
                  case MotionEvent.ACTION_MOVE:
                      if (clickable) {
                          drawableHotspotChanged(x, y);
                      }
  
                      final int motionClassification = event.getClassification();
                      final boolean ambiguousGesture =
                              motionClassification == MotionEvent.CLASSIFICATION_AMBIGUOUS_GESTURE;
                      int touchSlop = mTouchSlop;
                      if (ambiguousGesture && hasPendingLongPressCallback()) {
                          final float ambiguousMultiplier =
                                  ViewConfiguration.getAmbiguousGestureMultiplier();
                          if (!pointInView(x, y, touchSlop)) {
                              // The default action here is to cancel long press. But instead, we
                              // just extend the timeout here, in case the classification
                              // stays ambiguous.
                              removeLongPressCallback();
                              long delay = (long) (ViewConfiguration.getLongPressTimeout()
                                      * ambiguousMultiplier);
                              // Subtract the time already spent
                              delay -= event.getEventTime() - event.getDownTime();
                              checkForLongClick(
                                      delay,
                                      x,
                                      y,
                                      TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__LONG_PRESS);
                          }
                          touchSlop *= ambiguousMultiplier;
                      }
  
                      // Be lenient about moving outside of buttons
                      if (!pointInView(x, y, touchSlop)) {
                          // Outside button
                          // Remove any future long press/tap checks
                          removeTapCallback();
                          removeLongPressCallback();
                          if ((mPrivateFlags & PFLAG_PRESSED) != 0) {
                              setPressed(false);
                          }
                          mPrivateFlags3 &= ~PFLAG3_FINGER_DOWN;
                      }
  
                      final boolean deepPress =
                              motionClassification == MotionEvent.CLASSIFICATION_DEEP_PRESS;
                      if (deepPress && hasPendingLongPressCallback()) {
                          // process the long click action immediately
                          removeLongPressCallback();
                          checkForLongClick(
                                  0 /* send immediately */,
                                  x,
                                  y,
                                  TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__DEEP_PRESS);
                      }
  
                      break;
              }
  
              return true;
          }
  
          return false;
      }
  
      /**
       * @hide
       */
      @UnsupportedAppUsage
      public boolean isInScrollingContainer() {
          ViewParent p = getParent();
          while (p != null && p instanceof ViewGroup) {
              if (((ViewGroup) p).shouldDelayChildPressedState()) {
                  return true;
              }
              p = p.getParent();
          }
          return false;
      }
  
      /**
       * Remove the longpress detection timer.
       */
      private void removeLongPressCallback() {
          if (mPendingCheckForLongPress != null) {
              removeCallbacks(mPendingCheckForLongPress);
          }
      }
  
      /**
       * Return true if the long press callback is scheduled to run sometime in the future.
       * Return false if there is no scheduled long press callback at the moment.
       */
      private boolean hasPendingLongPressCallback() {
          if (mPendingCheckForLongPress == null) {
              return false;
          }
          final AttachInfo attachInfo = mAttachInfo;
          if (attachInfo == null) {
              return false;
          }
          return attachInfo.mHandler.hasCallbacks(mPendingCheckForLongPress);
      }
  
     /**
       * Remove the pending click action
       */
      @UnsupportedAppUsage
      private void removePerformClickCallback() {
          if (mPerformClick != null) {
              removeCallbacks(mPerformClick);
          }
      }
  
      /**
       * Remove the prepress detection timer.
       */
      private void removeUnsetPressCallback() {
          if ((mPrivateFlags & PFLAG_PRESSED) != 0 && mUnsetPressedState != null) {
              setPressed(false);
              removeCallbacks(mUnsetPressedState);
          }
      }
  
      /**
       * Remove the tap detection timer.
       */
      private void removeTapCallback() {
          if (mPendingCheckForTap != null) {
              mPrivateFlags &= ~PFLAG_PREPRESSED;
              removeCallbacks(mPendingCheckForTap);
          }
      }
  
      /**
       * Cancels a pending long press.  Your subclass can use this if you
       * want the context menu to come up if the user presses and holds
       * at the same place, but you don't want it to come up if they press
       * and then move around enough to cause scrolling.
       */
      public void cancelLongPress() {
          removeLongPressCallback();
  
          /*
           * The prepressed state handled by the tap callback is a display
           * construct, but the tap callback will post a long press callback
           * less its own timeout. Remove it here.
           */
          removeTapCallback();
      }
  
      /**
       * Sets the TouchDelegate for this View.
       */
      public void setTouchDelegate(TouchDelegate delegate) {
          mTouchDelegate = delegate;
      }
  
      /**
       * Gets the TouchDelegate for this View.
       */
      public TouchDelegate getTouchDelegate() {
          return mTouchDelegate;
      }
  
      /**
       * Request unbuffered dispatch of the given stream of MotionEvents to this View.
       *
       * Until this View receives a corresponding {@link MotionEvent#ACTION_UP}, ask that the input
       * system not batch {@link MotionEvent}s but instead deliver them as soon as they're
       * available. This method should only be called for touch events.
       *
       * <p class="note">This api is not intended for most applications. Buffered dispatch
       * provides many of benefits, and just requesting unbuffered dispatch on most MotionEvent
       * streams will not improve your input latency. Side effects include: increased latency,
       * jittery scrolls and inability to take advantage of system resampling. Talk to your input
       * professional to see if {@link #requestUnbufferedDispatch(MotionEvent)} is right for
       * you.</p>
       */
      public final void requestUnbufferedDispatch(MotionEvent event) {
          final int action = event.getAction();
          if (mAttachInfo == null
                  || action != MotionEvent.ACTION_DOWN && action != MotionEvent.ACTION_MOVE
                  || !event.isTouchEvent()) {
              return;
          }
          mAttachInfo.mUnbufferedDispatchRequested = true;
      }
  
      private boolean hasSize() {
          return (mBottom > mTop) && (mRight > mLeft);
      }
  
      private boolean canTakeFocus() {
          return ((mViewFlags & VISIBILITY_MASK) == VISIBLE)
                  && ((mViewFlags & FOCUSABLE) == FOCUSABLE)
                  && ((mViewFlags & ENABLED_MASK) == ENABLED)
                  && (sCanFocusZeroSized || !isLayoutValid() || hasSize());
      }
  
      /**
       * Set flags controlling behavior of this view.
       *
       * @param flags Constant indicating the value which should be set
       * @param mask Constant indicating the bit range that should be changed
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
      void setFlags(int flags, int mask) {
          final boolean accessibilityEnabled =
                  AccessibilityManager.getInstance(mContext).isEnabled();
          final boolean oldIncludeForAccessibility = accessibilityEnabled && includeForAccessibility();
  
          int old = mViewFlags;
          mViewFlags = (mViewFlags & ~mask) | (flags & mask);
  
          int changed = mViewFlags ^ old;
          if (changed == 0) {
              return;
          }
          int privateFlags = mPrivateFlags;
          boolean shouldNotifyFocusableAvailable = false;
  
          // If focusable is auto, update the FOCUSABLE bit.
          int focusableChangedByAuto = 0;
          if (((mViewFlags & FOCUSABLE_AUTO) != 0)
                  && (changed & (FOCUSABLE_MASK | CLICKABLE)) != 0) {
              // Heuristic only takes into account whether view is clickable.
              final int newFocus;
              if ((mViewFlags & CLICKABLE) != 0) {
                  newFocus = FOCUSABLE;
              } else {
                  newFocus = NOT_FOCUSABLE;
              }
              mViewFlags = (mViewFlags & ~FOCUSABLE) | newFocus;
              focusableChangedByAuto = (old & FOCUSABLE) ^ (newFocus & FOCUSABLE);
              changed = (changed & ~FOCUSABLE) | focusableChangedByAuto;
          }
  
          /* Check if the FOCUSABLE bit has changed */
          if (((changed & FOCUSABLE) != 0) && ((privateFlags & PFLAG_HAS_BOUNDS) != 0)) {
              if (((old & FOCUSABLE) == FOCUSABLE)
                      && ((privateFlags & PFLAG_FOCUSED) != 0)) {
                  /* Give up focus if we are no longer focusable */
                  clearFocus();
                  if (mParent instanceof ViewGroup) {
                      ((ViewGroup) mParent).clearFocusedInCluster();
                  }
              } else if (((old & FOCUSABLE) == NOT_FOCUSABLE)
                      && ((privateFlags & PFLAG_FOCUSED) == 0)) {
                  /*
                   * Tell the view system that we are now available to take focus
                   * if no one else already has it.
                   */
                  if (mParent != null) {
                      ViewRootImpl viewRootImpl = getViewRootImpl();
                      if (!sAutoFocusableOffUIThreadWontNotifyParents
                              || focusableChangedByAuto == 0
                              || viewRootImpl == null
                              || viewRootImpl.mThread == Thread.currentThread()) {
                          shouldNotifyFocusableAvailable = canTakeFocus();
                      }
                  }
              }
          }
  
          final int newVisibility = flags & VISIBILITY_MASK;
          if (newVisibility == VISIBLE) {
              if ((changed & VISIBILITY_MASK) != 0) {
                  /*
                   * If this view is becoming visible, invalidate it in case it changed while
                   * it was not visible. Marking it drawn ensures that the invalidation will
                   * go through.
                   */
                  mPrivateFlags |= PFLAG_DRAWN;
                  invalidate(true);
  
                  needGlobalAttributesUpdate(true);
  
                  // a view becoming visible is worth notifying the parent about in case nothing has
                  // focus. Even if this specific view isn't focusable, it may contain something that
                  // is, so let the root view try to give this focus if nothing else does.
                  shouldNotifyFocusableAvailable = hasSize();
              }
          }
  
          if ((changed & ENABLED_MASK) != 0) {
              if ((mViewFlags & ENABLED_MASK) == ENABLED) {
                  // a view becoming enabled should notify the parent as long as the view is also
                  // visible and the parent wasn't already notified by becoming visible during this
                  // setFlags invocation.
                  shouldNotifyFocusableAvailable = canTakeFocus();
              } else {
                  if (isFocused()) clearFocus();
              }
          }
  
          if (shouldNotifyFocusableAvailable && mParent != null) {
              mParent.focusableViewAvailable(this);
          }
  
          /* Check if the GONE bit has changed */
          if ((changed & GONE) != 0) {
              needGlobalAttributesUpdate(false);
              requestLayout();
  
              if (((mViewFlags & VISIBILITY_MASK) == GONE)) {
                  if (hasFocus()) {
                      clearFocus();
                      if (mParent instanceof ViewGroup) {
                          ((ViewGroup) mParent).clearFocusedInCluster();
                      }
                  }
                  clearAccessibilityFocus();
                  destroyDrawingCache();
                  if (mParent instanceof View) {
                      // GONE views noop invalidation, so invalidate the parent
                      ((View) mParent).invalidate(true);
                  }
                  // Mark the view drawn to ensure that it gets invalidated properly the next
                  // time it is visible and gets invalidated
                  mPrivateFlags |= PFLAG_DRAWN;
              }
              if (mAttachInfo != null) {
                  mAttachInfo.mViewVisibilityChanged = true;
              }
          }
  
          /* Check if the VISIBLE bit has changed */
          if ((changed & INVISIBLE) != 0) {
              needGlobalAttributesUpdate(false);
              /*
               * If this view is becoming invisible, set the DRAWN flag so that
               * the next invalidate() will not be skipped.
               */
              mPrivateFlags |= PFLAG_DRAWN;
  
              if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE)) {
                  // root view becoming invisible shouldn't clear focus and accessibility focus
                  if (getRootView() != this) {
                      if (hasFocus()) {
                          clearFocus();
                          if (mParent instanceof ViewGroup) {
                              ((ViewGroup) mParent).clearFocusedInCluster();
                          }
                      }
                      clearAccessibilityFocus();
                  }
              }
              if (mAttachInfo != null) {
                  mAttachInfo.mViewVisibilityChanged = true;
              }
          }
  
          if ((changed & VISIBILITY_MASK) != 0) {
              // If the view is invisible, cleanup its display list to free up resources
              if (newVisibility != VISIBLE && mAttachInfo != null) {
                  cleanupDraw();
              }
  
              if (mParent instanceof ViewGroup) {
                  ViewGroup parent = (ViewGroup) mParent;
                  parent.onChildVisibilityChanged(this, (changed & VISIBILITY_MASK),
                          newVisibility);
                  parent.invalidate(true);
              } else if (mParent != null) {
                  mParent.invalidateChild(this, null);
              }
  
              if (mAttachInfo != null) {
                  dispatchVisibilityChanged(this, newVisibility);
  
                  // Aggregated visibility changes are dispatched to attached views
                  // in visible windows where the parent is currently shown/drawn
                  // or the parent is not a ViewGroup (and therefore assumed to be a ViewRoot),
                  // discounting clipping or overlapping. This makes it a good place
                  // to change animation states.
                  if (mParent != null && getWindowVisibility() == VISIBLE &&
                          ((!(mParent instanceof ViewGroup)) || ((ViewGroup) mParent).isShown())) {
                      dispatchVisibilityAggregated(newVisibility == VISIBLE);
                  }
                  notifySubtreeAccessibilityStateChangedIfNeeded();
              }
          }
  
          if ((changed & WILL_NOT_CACHE_DRAWING) != 0) {
              destroyDrawingCache();
          }
  
          if ((changed & DRAWING_CACHE_ENABLED) != 0) {
              destroyDrawingCache();
              mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
              invalidateParentCaches();
          }
  
          if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) {
              destroyDrawingCache();
              mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
          }
  
          if ((changed & DRAW_MASK) != 0) {
              if ((mViewFlags & WILL_NOT_DRAW) != 0) {
                  if (mBackground != null
                          || mDefaultFocusHighlight != null
                          || (mForegroundInfo != null && mForegroundInfo.mDrawable != null)) {
                      mPrivateFlags &= ~PFLAG_SKIP_DRAW;
                  } else {
                      mPrivateFlags |= PFLAG_SKIP_DRAW;
                  }
              } else {
                  mPrivateFlags &= ~PFLAG_SKIP_DRAW;
              }
              requestLayout();
              invalidate(true);
          }
  
          if ((changed & KEEP_SCREEN_ON) != 0) {
              if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) {
                  mParent.recomputeViewAttributes(this);
              }
          }
  
          if (accessibilityEnabled) {
              // If we're an accessibility pane and the visibility changed, we already have sent
              // a state change, so we really don't need to report other changes.
              if (isAccessibilityPane()) {
                  changed &= ~VISIBILITY_MASK;
              }
              if ((changed & FOCUSABLE) != 0 || (changed & VISIBILITY_MASK) != 0
                      || (changed & CLICKABLE) != 0 || (changed & LONG_CLICKABLE) != 0
                      || (changed & CONTEXT_CLICKABLE) != 0) {
                  if (oldIncludeForAccessibility != includeForAccessibility()) {
                      notifySubtreeAccessibilityStateChangedIfNeeded();
                  } else {
                      notifyViewAccessibilityStateChangedIfNeeded(
                              AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
                  }
              } else if ((changed & ENABLED_MASK) != 0) {
                  notifyViewAccessibilityStateChangedIfNeeded(
                          AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
              }
          }
      }
  
      /**
       * Change the view's z order in the tree, so it's on top of other sibling
       * views. This ordering change may affect layout, if the parent container
       * uses an order-dependent layout scheme (e.g., LinearLayout). Prior
       * to {@link android.os.Build.VERSION_CODES#KITKAT} this
       * method should be followed by calls to {@link #requestLayout()} and
       * {@link View#invalidate()} on the view's parent to force the parent to redraw
       * with the new child ordering.
       *
       * @see ViewGroup#bringChildToFront(View)
       */
      public void bringToFront() {
          if (mParent != null) {
              mParent.bringChildToFront(this);
          }
      }
  
      /**
       * This is called in response to an internal scroll in this view (i.e., the
       * view scrolled its own contents). This is typically as a result of
       * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been
       * called.
       *
       * @param l Current horizontal scroll origin.
       * @param t Current vertical scroll origin.
       * @param oldl Previous horizontal scroll origin.
       * @param oldt Previous vertical scroll origin.
       */
      protected void onScrollChanged(int l, int t, int oldl, int oldt) {
          notifySubtreeAccessibilityStateChangedIfNeeded();
  
          if (AccessibilityManager.getInstance(mContext).isEnabled()) {
              postSendViewScrolledAccessibilityEventCallback(l - oldl, t - oldt);
          }
  
          mBackgroundSizeChanged = true;
          mDefaultFocusHighlightSizeChanged = true;
          if (mForegroundInfo != null) {
              mForegroundInfo.mBoundsChanged = true;
          }
  
          final AttachInfo ai = mAttachInfo;
          if (ai != null) {
              ai.mViewScrollChanged = true;
          }
  
          if (mListenerInfo != null && mListenerInfo.mOnScrollChangeListener != null) {
              mListenerInfo.mOnScrollChangeListener.onScrollChange(this, l, t, oldl, oldt);
          }
      }
  
      /**
       * Interface definition for a callback to be invoked when the scroll
       * X or Y positions of a view change.
       * <p>
       * <b>Note:</b> Some views handle scrolling independently from View and may
       * have their own separate listeners for scroll-type events. For example,
       * {@link android.widget.ListView ListView} allows clients to register an
       * {@link android.widget.ListView#setOnScrollListener(android.widget.AbsListView.OnScrollListener) AbsListView.OnScrollListener}
       * to listen for changes in list scroll position.
       *
       * @see #setOnScrollChangeListener(View.OnScrollChangeListener)
       */
      public interface OnScrollChangeListener {
          /**
           * Called when the scroll position of a view changes.
           *
           * @param v The view whose scroll position has changed.
           * @param scrollX Current horizontal scroll origin.
           * @param scrollY Current vertical scroll origin.
           * @param oldScrollX Previous horizontal scroll origin.
           * @param oldScrollY Previous vertical scroll origin.
           */
          void onScrollChange(View v, int scrollX, int scrollY, int oldScrollX, int oldScrollY);
      }
  
      /**
       * Interface definition for a callback to be invoked when the layout bounds of a view
       * changes due to layout processing.
       */
      public interface OnLayoutChangeListener {
          /**
           * Called when the layout bounds of a view changes due to layout processing.
           *
           * @param v The view whose bounds have changed.
           * @param left The new value of the view's left property.
           * @param top The new value of the view's top property.
           * @param right The new value of the view's right property.
           * @param bottom The new value of the view's bottom property.
           * @param oldLeft The previous value of the view's left property.
           * @param oldTop The previous value of the view's top property.
           * @param oldRight The previous value of the view's right property.
           * @param oldBottom The previous value of the view's bottom property.
           */
          void onLayoutChange(View v, int left, int top, int right, int bottom,
              int oldLeft, int oldTop, int oldRight, int oldBottom);
      }
  
      /**
       * This is called during layout when the size of this view has changed. If
       * you were just added to the view hierarchy, you're called with the old
       * values of 0.
       *
       * @param w Current width of this view.
       * @param h Current height of this view.
       * @param oldw Old width of this view.
       * @param oldh Old height of this view.
       */
      protected void onSizeChanged(int w, int h, int oldw, int oldh) {
      }
  
      /**
       * Called by draw to draw the child views. This may be overridden
       * by derived classes to gain control just before its children are drawn
       * (but after its own view has been drawn).
       * @param canvas the canvas on which to draw the view
       */
      protected void dispatchDraw(Canvas canvas) {
  
      }
  
      /**
       * Gets the parent of this view. Note that the parent is a
       * ViewParent and not necessarily a View.
       *
       * @return Parent of this view.
       */
      public final ViewParent getParent() {
          return mParent;
      }
  
      /**
       * Set the horizontal scrolled position of your view. This will cause a call to
       * {@link #onScrollChanged(int, int, int, int)} and the view will be
       * invalidated.
       * @param value the x position to scroll to
       */
      public void setScrollX(int value) {
          scrollTo(value, mScrollY);
      }
  
      /**
       * Set the vertical scrolled position of your view. This will cause a call to
       * {@link #onScrollChanged(int, int, int, int)} and the view will be
       * invalidated.
       * @param value the y position to scroll to
       */
      public void setScrollY(int value) {
          scrollTo(mScrollX, value);
      }
  
      /**
       * Return the scrolled left position of this view. This is the left edge of
       * the displayed part of your view. You do not need to draw any pixels
       * farther left, since those are outside of the frame of your view on
       * screen.
       *
       * @return The left edge of the displayed part of your view, in pixels.
       */
      @InspectableProperty
      public final int getScrollX() {
          return mScrollX;
      }
  
      /**
       * Return the scrolled top position of this view. This is the top edge of
       * the displayed part of your view. You do not need to draw any pixels above
       * it, since those are outside of the frame of your view on screen.
       *
       * @return The top edge of the displayed part of your view, in pixels.
       */
      @InspectableProperty
      public final int getScrollY() {
          return mScrollY;
      }
  
      /**
       * Return the width of your view.
       *
       * @return The width of your view, in pixels.
       */
      @ViewDebug.ExportedProperty(category = "layout")
      public final int getWidth() {
          return mRight - mLeft;
      }
  
      /**
       * Return the height of your view.
       *
       * @return The height of your view, in pixels.
       */
      @ViewDebug.ExportedProperty(category = "layout")
      public final int getHeight() {
          return mBottom - mTop;
      }
  
      /**
       * Return the visible drawing bounds of your view. Fills in the output
       * rectangle with the values from getScrollX(), getScrollY(),
       * getWidth(), and getHeight(). These bounds do not account for any
       * transformation properties currently set on the view, such as
       * {@link #setScaleX(float)} or {@link #setRotation(float)}.
       *
       * @param outRect The (scrolled) drawing bounds of the view.
       */
      public void getDrawingRect(Rect outRect) {
          outRect.left = mScrollX;
          outRect.top = mScrollY;
          outRect.right = mScrollX + (mRight - mLeft);
          outRect.bottom = mScrollY + (mBottom - mTop);
      }
  
      /**
       * Like {@link #getMeasuredWidthAndState()}, but only returns the
       * raw width component (that is the result is masked by
       * {@link #MEASURED_SIZE_MASK}).
       *
       * @return The raw measured width of this view.
       */
      public final int getMeasuredWidth() {
          return mMeasuredWidth & MEASURED_SIZE_MASK;
      }
  
      /**
       * Return the full width measurement information for this view as computed
       * by the most recent call to {@link #measure(int, int)}.  This result is a bit mask
       * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}.
       * This should be used during measurement and layout calculations only. Use
       * {@link #getWidth()} to see how wide a view is after layout.
       *
       * @return The measured width of this view as a bit mask.
       */
      @ViewDebug.ExportedProperty(category = "measurement", flagMapping = {
              @ViewDebug.FlagToString(mask = MEASURED_STATE_MASK, equals = MEASURED_STATE_TOO_SMALL,
                      name = "MEASURED_STATE_TOO_SMALL"),
      })
      public final int getMeasuredWidthAndState() {
          return mMeasuredWidth;
      }
  
      /**
       * Like {@link #getMeasuredHeightAndState()}, but only returns the
       * raw height component (that is the result is masked by
       * {@link #MEASURED_SIZE_MASK}).
       *
       * @return The raw measured height of this view.
       */
      public final int getMeasuredHeight() {
          return mMeasuredHeight & MEASURED_SIZE_MASK;
      }
  
      /**
       * Return the full height measurement information for this view as computed
       * by the most recent call to {@link #measure(int, int)}.  This result is a bit mask
       * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}.
       * This should be used during measurement and layout calculations only. Use
       * {@link #getHeight()} to see how high a view is after layout.
       *
       * @return The measured height of this view as a bit mask.
       */
      @ViewDebug.ExportedProperty(category = "measurement", flagMapping = {
              @ViewDebug.FlagToString(mask = MEASURED_STATE_MASK, equals = MEASURED_STATE_TOO_SMALL,
                      name = "MEASURED_STATE_TOO_SMALL"),
      })
      public final int getMeasuredHeightAndState() {
          return mMeasuredHeight;
      }
  
      /**
       * Return only the state bits of {@link #getMeasuredWidthAndState()}
       * and {@link #getMeasuredHeightAndState()}, combined into one integer.
       * The width component is in the regular bits {@link #MEASURED_STATE_MASK}
       * and the height component is at the shifted bits
       * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}.
       */
      public final int getMeasuredState() {
          return (mMeasuredWidth&MEASURED_STATE_MASK)
                  | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT)
                          & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT));
      }
  
      /**
       * The transform matrix of this view, which is calculated based on the current
       * rotation, scale, and pivot properties.
       *
       * @see #getRotation()
       * @see #getScaleX()
       * @see #getScaleY()
       * @see #getPivotX()
       * @see #getPivotY()
       * @return The current transform matrix for the view
       */
      public Matrix getMatrix() {
          ensureTransformationInfo();
          final Matrix matrix = mTransformationInfo.mMatrix;
          mRenderNode.getMatrix(matrix);
          return matrix;
      }
  
      /**
       * Returns true if the transform matrix is the identity matrix.
       * Recomputes the matrix if necessary.
       *
       * @return True if the transform matrix is the identity matrix, false otherwise.
       * @hide
       */
      @UnsupportedAppUsage
      public final boolean hasIdentityMatrix() {
          return mRenderNode.hasIdentityMatrix();
      }
  
      @UnsupportedAppUsage
      void ensureTransformationInfo() {
          if (mTransformationInfo == null) {
              mTransformationInfo = new TransformationInfo();
          }
      }
  
      /**
       * Utility method to retrieve the inverse of the current mMatrix property.
       * We cache the matrix to avoid recalculating it when transform properties
       * have not changed.
       *
       * @return The inverse of the current matrix of this view.
       * @hide
       */
      @UnsupportedAppUsage
      public final Matrix getInverseMatrix() {
          ensureTransformationInfo();
          if (mTransformationInfo.mInverseMatrix == null) {
              mTransformationInfo.mInverseMatrix = new Matrix();
          }
          final Matrix matrix = mTransformationInfo.mInverseMatrix;
          mRenderNode.getInverseMatrix(matrix);
          return matrix;
      }
  
      /**
       * Gets the distance along the Z axis from the camera to this view.
       *
       * @see #setCameraDistance(float)
       *
       * @return The distance along the Z axis.
       */
      public float getCameraDistance() {
          final float dpi = mResources.getDisplayMetrics().densityDpi;
          return mRenderNode.getCameraDistance() * dpi;
      }
  
      /**
       * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which
       * views are drawn) from the camera to this view. The camera's distance
       * affects 3D transformations, for instance rotations around the X and Y
       * axis. If the rotationX or rotationY properties are changed and this view is
       * large (more than half the size of the screen), it is recommended to always
       * use a camera distance that's greater than the height (X axis rotation) or
       * the width (Y axis rotation) of this view.</p>
       *
       * <p>The distance of the camera from the view plane can have an affect on the
       * perspective distortion of the view when it is rotated around the x or y axis.
       * For example, a large distance will result in a large viewing angle, and there
       * will not be much perspective distortion of the view as it rotates. A short
       * distance may cause much more perspective distortion upon rotation, and can
       * also result in some drawing artifacts if the rotated view ends up partially
       * behind the camera (which is why the recommendation is to use a distance at
       * least as far as the size of the view, if the view is to be rotated.)</p>
       *
       * <p>The distance is expressed in "depth pixels." The default distance depends
       * on the screen density. For instance, on a medium density display, the
       * default distance is 1280. On a high density display, the default distance
       * is 1920.</p>
       *
       * <p>If you want to specify a distance that leads to visually consistent
       * results across various densities, use the following formula:</p>
       * <pre>
       * float scale = context.getResources().getDisplayMetrics().density;
       * view.setCameraDistance(distance * scale);
       * </pre>
       *
       * <p>The density scale factor of a high density display is 1.5,
       * and 1920 = 1280 * 1.5.</p>
       *
       * @param distance The distance in "depth pixels", if negative the opposite
       *        value is used
       *
       * @see #setRotationX(float)
       * @see #setRotationY(float)
       */
      public void setCameraDistance(float distance) {
          final float dpi = mResources.getDisplayMetrics().densityDpi;
  
          invalidateViewProperty(true, false);
          mRenderNode.setCameraDistance(Math.abs(distance) / dpi);
          invalidateViewProperty(false, false);
  
          invalidateParentIfNeededAndWasQuickRejected();
      }
  
      /**
       * The degrees that the view is rotated around the pivot point.
       *
       * @see #setRotation(float)
       * @see #getPivotX()
       * @see #getPivotY()
       *
       * @return The degrees of rotation.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      @InspectableProperty
      public float getRotation() {
          return mRenderNode.getRotationZ();
      }
  
      /**
       * Sets the degrees that the view is rotated around the pivot point. Increasing values
       * result in clockwise rotation.
       *
       * @param rotation The degrees of rotation.
       *
       * @see #getRotation()
       * @see #getPivotX()
       * @see #getPivotY()
       * @see #setRotationX(float)
       * @see #setRotationY(float)
       *
       * @attr ref android.R.styleable#View_rotation
       */
      public void setRotation(float rotation) {
          if (rotation != getRotation()) {
              // Double-invalidation is necessary to capture view's old and new areas
              invalidateViewProperty(true, false);
              mRenderNode.setRotationZ(rotation);
              invalidateViewProperty(false, true);
  
              invalidateParentIfNeededAndWasQuickRejected();
              notifySubtreeAccessibilityStateChangedIfNeeded();
          }
      }
  
      /**
       * The degrees that the view is rotated around the vertical axis through the pivot point.
       *
       * @see #getPivotX()
       * @see #getPivotY()
       * @see #setRotationY(float)
       *
       * @return The degrees of Y rotation.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      @InspectableProperty
      public float getRotationY() {
          return mRenderNode.getRotationY();
      }
  
      /**
       * Sets the degrees that the view is rotated around the vertical axis through the pivot point.
       * Increasing values result in counter-clockwise rotation from the viewpoint of looking
       * down the y axis.
       *
       * When rotating large views, it is recommended to adjust the camera distance
       * accordingly. Refer to {@link #setCameraDistance(float)} for more information.
       *
       * @param rotationY The degrees of Y rotation.
       *
       * @see #getRotationY()
       * @see #getPivotX()
       * @see #getPivotY()
       * @see #setRotation(float)
       * @see #setRotationX(float)
       * @see #setCameraDistance(float)
       *
       * @attr ref android.R.styleable#View_rotationY
       */
      public void setRotationY(float rotationY) {
          if (rotationY != getRotationY()) {
              invalidateViewProperty(true, false);
              mRenderNode.setRotationY(rotationY);
              invalidateViewProperty(false, true);
  
              invalidateParentIfNeededAndWasQuickRejected();
              notifySubtreeAccessibilityStateChangedIfNeeded();
          }
      }
  
      /**
       * The degrees that the view is rotated around the horizontal axis through the pivot point.
       *
       * @see #getPivotX()
       * @see #getPivotY()
       * @see #setRotationX(float)
       *
       * @return The degrees of X rotation.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      @InspectableProperty
      public float getRotationX() {
          return mRenderNode.getRotationX();
      }
  
      /**
       * Sets the degrees that the view is rotated around the horizontal axis through the pivot point.
       * Increasing values result in clockwise rotation from the viewpoint of looking down the
       * x axis.
       *
       * When rotating large views, it is recommended to adjust the camera distance
       * accordingly. Refer to {@link #setCameraDistance(float)} for more information.
       *
       * @param rotationX The degrees of X rotation.
       *
       * @see #getRotationX()
       * @see #getPivotX()
       * @see #getPivotY()
       * @see #setRotation(float)
       * @see #setRotationY(float)
       * @see #setCameraDistance(float)
       *
       * @attr ref android.R.styleable#View_rotationX
       */
      public void setRotationX(float rotationX) {
          if (rotationX != getRotationX()) {
              invalidateViewProperty(true, false);
              mRenderNode.setRotationX(rotationX);
              invalidateViewProperty(false, true);
  
              invalidateParentIfNeededAndWasQuickRejected();
              notifySubtreeAccessibilityStateChangedIfNeeded();
          }
      }
  
      /**
       * The amount that the view is scaled in x around the pivot point, as a proportion of
       * the view's unscaled width. A value of 1, the default, means that no scaling is applied.
       *
       * <p>By default, this is 1.0f.
       *
       * @see #getPivotX()
       * @see #getPivotY()
       * @return The scaling factor.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      @InspectableProperty
      public float getScaleX() {
          return mRenderNode.getScaleX();
      }
  
      /**
       * Sets the amount that the view is scaled in x around the pivot point, as a proportion of
       * the view's unscaled width. A value of 1 means that no scaling is applied.
       *
       * @param scaleX The scaling factor.
       * @see #getPivotX()
       * @see #getPivotY()
       *
       * @attr ref android.R.styleable#View_scaleX
       */
      public void setScaleX(float scaleX) {
          if (scaleX != getScaleX()) {
              scaleX = sanitizeFloatPropertyValue(scaleX, "scaleX");
              invalidateViewProperty(true, false);
              mRenderNode.setScaleX(scaleX);
              invalidateViewProperty(false, true);
  
              invalidateParentIfNeededAndWasQuickRejected();
              notifySubtreeAccessibilityStateChangedIfNeeded();
          }
      }
  
      /**
       * The amount that the view is scaled in y around the pivot point, as a proportion of
       * the view's unscaled height. A value of 1, the default, means that no scaling is applied.
       *
       * <p>By default, this is 1.0f.
       *
       * @see #getPivotX()
       * @see #getPivotY()
       * @return The scaling factor.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      @InspectableProperty
      public float getScaleY() {
          return mRenderNode.getScaleY();
      }
  
      /**
       * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of
       * the view's unscaled width. A value of 1 means that no scaling is applied.
       *
       * @param scaleY The scaling factor.
       * @see #getPivotX()
       * @see #getPivotY()
       *
       * @attr ref android.R.styleable#View_scaleY
       */
      public void setScaleY(float scaleY) {
          if (scaleY != getScaleY()) {
              scaleY = sanitizeFloatPropertyValue(scaleY, "scaleY");
              invalidateViewProperty(true, false);
              mRenderNode.setScaleY(scaleY);
              invalidateViewProperty(false, true);
  
              invalidateParentIfNeededAndWasQuickRejected();
              notifySubtreeAccessibilityStateChangedIfNeeded();
          }
      }
  
      /**
       * The x location of the point around which the view is {@link #setRotation(float) rotated}
       * and {@link #setScaleX(float) scaled}.
       *
       * @see #getRotation()
       * @see #getScaleX()
       * @see #getScaleY()
       * @see #getPivotY()
       * @return The x location of the pivot point.
       *
       * @attr ref android.R.styleable#View_transformPivotX
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      @InspectableProperty(name = "transformPivotX")
      public float getPivotX() {
          return mRenderNode.getPivotX();
      }
  
      /**
       * Sets the x location of the point around which the view is
       * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}.
       * By default, the pivot point is centered on the object.
       * Setting this property disables this behavior and causes the view to use only the
       * explicitly set pivotX and pivotY values.
       *
       * @param pivotX The x location of the pivot point.
       * @see #getRotation()
       * @see #getScaleX()
       * @see #getScaleY()
       * @see #getPivotY()
       *
       * @attr ref android.R.styleable#View_transformPivotX
       */
      public void setPivotX(float pivotX) {
          if (!mRenderNode.isPivotExplicitlySet() || pivotX != getPivotX()) {
              invalidateViewProperty(true, false);
              mRenderNode.setPivotX(pivotX);
              invalidateViewProperty(false, true);
  
              invalidateParentIfNeededAndWasQuickRejected();
          }
      }
  
      /**
       * The y location of the point around which the view is {@link #setRotation(float) rotated}
       * and {@link #setScaleY(float) scaled}.
       *
       * @see #getRotation()
       * @see #getScaleX()
       * @see #getScaleY()
       * @see #getPivotY()
       * @return The y location of the pivot point.
       *
       * @attr ref android.R.styleable#View_transformPivotY
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      @InspectableProperty(name = "transformPivotY")
      public float getPivotY() {
          return mRenderNode.getPivotY();
      }
  
      /**
       * Sets the y location of the point around which the view is {@link #setRotation(float) rotated}
       * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object.
       * Setting this property disables this behavior and causes the view to use only the
       * explicitly set pivotX and pivotY values.
       *
       * @param pivotY The y location of the pivot point.
       * @see #getRotation()
       * @see #getScaleX()
       * @see #getScaleY()
       * @see #getPivotY()
       *
       * @attr ref android.R.styleable#View_transformPivotY
       */
      public void setPivotY(float pivotY) {
          if (!mRenderNode.isPivotExplicitlySet() || pivotY != getPivotY()) {
              invalidateViewProperty(true, false);
              mRenderNode.setPivotY(pivotY);
              invalidateViewProperty(false, true);
  
              invalidateParentIfNeededAndWasQuickRejected();
          }
      }
  
      /**
       * Returns whether or not a pivot has been set by a call to {@link #setPivotX(float)} or
       * {@link #setPivotY(float)}. If no pivot has been set then the pivot will be the center
       * of the view.
       *
       * @return True if a pivot has been set, false if the default pivot is being used
       */
      public boolean isPivotSet() {
          return mRenderNode.isPivotExplicitlySet();
      }
  
      /**
       * Clears any pivot previously set by a call to  {@link #setPivotX(float)} or
       * {@link #setPivotY(float)}. After calling this {@link #isPivotSet()} will be false
       * and the pivot used for rotation will return to default of being centered on the view.
       */
      public void resetPivot() {
          if (mRenderNode.resetPivot()) {
              invalidateViewProperty(false, false);
          }
      }
  
      /**
       * The opacity of the view. This is a value from 0 to 1, where 0 means the view is
       * completely transparent and 1 means the view is completely opaque.
       *
       * <p>By default this is 1.0f.
       * @return The opacity of the view.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      @InspectableProperty
      public float getAlpha() {
          return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1;
      }
  
      /**
       * Sets the behavior for overlapping rendering for this view (see {@link
       * #hasOverlappingRendering()} for more details on this behavior). Calling this method
       * is an alternative to overriding {@link #hasOverlappingRendering()} in a subclass,
       * providing the value which is then used internally. That is, when {@link
       * #forceHasOverlappingRendering(boolean)} is called, the value of {@link
       * #hasOverlappingRendering()} is ignored and the value passed into this method is used
       * instead.
       *
       * @param hasOverlappingRendering The value for overlapping rendering to be used internally
       * instead of that returned by {@link #hasOverlappingRendering()}.
       *
       * @attr ref android.R.styleable#View_forceHasOverlappingRendering
       */
      public void forceHasOverlappingRendering(boolean hasOverlappingRendering) {
          mPrivateFlags3 |= PFLAG3_HAS_OVERLAPPING_RENDERING_FORCED;
          if (hasOverlappingRendering) {
              mPrivateFlags3 |= PFLAG3_OVERLAPPING_RENDERING_FORCED_VALUE;
          } else {
              mPrivateFlags3 &= ~PFLAG3_OVERLAPPING_RENDERING_FORCED_VALUE;
          }
      }
  
      /**
       * Returns the value for overlapping rendering that is used internally. This is either
       * the value passed into {@link #forceHasOverlappingRendering(boolean)}, if called, or
       * the return value of {@link #hasOverlappingRendering()}, otherwise.
       *
       * @return The value for overlapping rendering being used internally.
       */
      public final boolean getHasOverlappingRendering() {
          return (mPrivateFlags3 & PFLAG3_HAS_OVERLAPPING_RENDERING_FORCED) != 0 ?
                  (mPrivateFlags3 & PFLAG3_OVERLAPPING_RENDERING_FORCED_VALUE) != 0 :
                  hasOverlappingRendering();
      }
  
      /**
       * Returns whether this View has content which overlaps.
       *
       * <p>This function, intended to be overridden by specific View types, is an optimization when
       * alpha is set on a view. If rendering overlaps in a view with alpha < 1, that view is drawn to
       * an offscreen buffer and then composited into place, which can be expensive. If the view has
       * no overlapping rendering, the view can draw each primitive with the appropriate alpha value
       * directly. An example of overlapping rendering is a TextView with a background image, such as
       * a Button. An example of non-overlapping rendering is a TextView with no background, or an
       * ImageView with only the foreground image. The default implementation returns true; subclasses
       * should override if they have cases which can be optimized.</p>
       *
       * <p><strong>Note:</strong> The return value of this method is ignored if {@link
       * #forceHasOverlappingRendering(boolean)} has been called on this view.</p>
       *
       * @return true if the content in this view might overlap, false otherwise.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      public boolean hasOverlappingRendering() {
          return true;
      }
  
      /**
       * Sets the opacity of the view to a value from 0 to 1, where 0 means the view is
       * completely transparent and 1 means the view is completely opaque.
       *
       * <p class="note"><strong>Note:</strong> setting alpha to a translucent value (0 < alpha < 1)
       * can have significant performance implications, especially for large views. It is best to use
       * the alpha property sparingly and transiently, as in the case of fading animations.</p>
       *
       * <p>For a view with a frequently changing alpha, such as during a fading animation, it is
       * strongly recommended for performance reasons to either override
       * {@link #hasOverlappingRendering()} to return <code>false</code> if appropriate, or setting a
       * {@link #setLayerType(int, android.graphics.Paint) layer type} on the view for the duration
       * of the animation. On versions {@link android.os.Build.VERSION_CODES#M} and below,
       * the default path for rendering an unlayered View with alpha could add multiple milliseconds
       * of rendering cost, even for simple or small views. Starting with
       * {@link android.os.Build.VERSION_CODES#M}, {@link #LAYER_TYPE_HARDWARE} is automatically
       * applied to the view at the rendering level.</p>
       *
       * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is
       * responsible for applying the opacity itself.</p>
       *
       * <p>On versions {@link android.os.Build.VERSION_CODES#LOLLIPOP_MR1} and below, note that if
       * the view is backed by a {@link #setLayerType(int, android.graphics.Paint) layer} and is
       * associated with a {@link #setLayerPaint(android.graphics.Paint) layer paint}, setting an
       * alpha value less than 1.0 will supersede the alpha of the layer paint.</p>
       *
       * <p>Starting with {@link android.os.Build.VERSION_CODES#M}, setting a translucent alpha
       * value will clip a View to its bounds, unless the View returns <code>false</code> from
       * {@link #hasOverlappingRendering}.</p>
       *
       * @param alpha The opacity of the view.
       *
       * @see #hasOverlappingRendering()
       * @see #setLayerType(int, android.graphics.Paint)
       *
       * @attr ref android.R.styleable#View_alpha
       */
      public void setAlpha(@FloatRange(from=0.0, to=1.0) float alpha) {
          ensureTransformationInfo();
          if (mTransformationInfo.mAlpha != alpha) {
              setAlphaInternal(alpha);
              if (onSetAlpha((int) (alpha * 255))) {
                  mPrivateFlags |= PFLAG_ALPHA_SET;
                  // subclass is handling alpha - don't optimize rendering cache invalidation
                  invalidateParentCaches();
                  invalidate(true);
              } else {
                  mPrivateFlags &= ~PFLAG_ALPHA_SET;
                  invalidateViewProperty(true, false);
                  mRenderNode.setAlpha(getFinalAlpha());
              }
          }
      }
  
      /**
       * Faster version of setAlpha() which performs the same steps except there are
       * no calls to invalidate(). The caller of this function should perform proper invalidation
       * on the parent and this object. The return value indicates whether the subclass handles
       * alpha (the return value for onSetAlpha()).
       *
       * @param alpha The new value for the alpha property
       * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and
       *         the new value for the alpha property is different from the old value
       */
      @UnsupportedAppUsage(maxTargetSdk  = Build.VERSION_CODES.P, trackingBug = 123768435)
      boolean setAlphaNoInvalidation(float alpha) {
          ensureTransformationInfo();
          if (mTransformationInfo.mAlpha != alpha) {
              setAlphaInternal(alpha);
              boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255));
              if (subclassHandlesAlpha) {
                  mPrivateFlags |= PFLAG_ALPHA_SET;
                  return true;
              } else {
                  mPrivateFlags &= ~PFLAG_ALPHA_SET;
                  mRenderNode.setAlpha(getFinalAlpha());
              }
          }
          return false;
      }
  
      void setAlphaInternal(float alpha) {
          float oldAlpha = mTransformationInfo.mAlpha;
          mTransformationInfo.mAlpha = alpha;
          // Report visibility changes, which can affect children, to accessibility
          if ((alpha == 0) ^ (oldAlpha == 0)) {
              notifySubtreeAccessibilityStateChangedIfNeeded();
          }
      }
  
      /**
       * This property is intended only for use by the Fade transition, which animates it
       * to produce a visual translucency that does not side-effect (or get affected by)
       * the real alpha property. This value is composited with the other alpha value
       * (and the AlphaAnimation value, when that is present) to produce a final visual
       * translucency result, which is what is passed into the DisplayList.
       */
      public void setTransitionAlpha(float alpha) {
          ensureTransformationInfo();
          if (mTransformationInfo.mTransitionAlpha != alpha) {
              mTransformationInfo.mTransitionAlpha = alpha;
              mPrivateFlags &= ~PFLAG_ALPHA_SET;
              invalidateViewProperty(true, false);
              mRenderNode.setAlpha(getFinalAlpha());
          }
      }
  
      /**
       * Calculates the visual alpha of this view, which is a combination of the actual
       * alpha value and the transitionAlpha value (if set).
       */
      private float getFinalAlpha() {
          if (mTransformationInfo != null) {
              return mTransformationInfo.mAlpha * mTransformationInfo.mTransitionAlpha;
          }
          return 1;
      }
  
      /**
       * This property is intended only for use by the Fade transition, which animates
       * it to produce a visual translucency that does not side-effect (or get affected
       * by) the real alpha property. This value is composited with the other alpha
       * value (and the AlphaAnimation value, when that is present) to produce a final
       * visual translucency result, which is what is passed into the DisplayList.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      public float getTransitionAlpha() {
          return mTransformationInfo != null ? mTransformationInfo.mTransitionAlpha : 1;
      }
  
      /**
       * Sets whether or not to allow force dark to apply to this view.
       *
       * Setting this to false will disable the auto-dark feature on everything this view
       * draws, including any descendants.
       *
       * Setting this to true will allow this view to be automatically made dark, however
       * a value of 'true' will not override any 'false' value in its parent chain nor will
       * it prevent any 'false' in any of its children.
       *
       * The default behavior of force dark is also influenced by the Theme's
       * {@link android.R.styleable#Theme_isLightTheme isLightTheme} attribute.
       * If a theme is isLightTheme="false", then force dark is globally disabled for that theme.
       *
       * @param allow Whether or not to allow force dark.
       */
      public void setForceDarkAllowed(boolean allow) {
          if (mRenderNode.setForceDarkAllowed(allow)) {
              // Currently toggling force-dark requires a new display list push to apply
              // TODO: Make it not clobber the display list so this is just a damageSelf() instead
              invalidate();
          }
      }
  
      /**
       * See {@link #setForceDarkAllowed(boolean)}
       *
       * @return true if force dark is allowed (default), false if it is disabled
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      @InspectableProperty
      public boolean isForceDarkAllowed() {
          return mRenderNode.isForceDarkAllowed();
      }
  
      /**
       * Top position of this view relative to its parent.
       *
       * @return The top of this view, in pixels.
       */
      @ViewDebug.CapturedViewProperty
      public final int getTop() {
          return mTop;
      }
  
      /**
       * Sets the top position of this view relative to its parent. This method is meant to be called
       * by the layout system and should not generally be called otherwise, because the property
       * may be changed at any time by the layout.
       *
       * @param top The top of this view, in pixels.
       */
      public final void setTop(int top) {
          if (top != mTop) {
              final boolean matrixIsIdentity = hasIdentityMatrix();
              if (matrixIsIdentity) {
                  if (mAttachInfo != null) {
                      int minTop;
                      int yLoc;
                      if (top < mTop) {
                          minTop = top;
                          yLoc = top - mTop;
                      } else {
                          minTop = mTop;
                          yLoc = 0;
                      }
                      invalidate(0, yLoc, mRight - mLeft, mBottom - minTop);
                  }
              } else {
                  // Double-invalidation is necessary to capture view's old and new areas
                  invalidate(true);
              }
  
              int width = mRight - mLeft;
              int oldHeight = mBottom - mTop;
  
              mTop = top;
              mRenderNode.setTop(mTop);
  
              sizeChange(width, mBottom - mTop, width, oldHeight);
  
              if (!matrixIsIdentity) {
                  mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation
                  invalidate(true);
              }
              mBackgroundSizeChanged = true;
              mDefaultFocusHighlightSizeChanged = true;
              if (mForegroundInfo != null) {
                  mForegroundInfo.mBoundsChanged = true;
              }
              invalidateParentIfNeeded();
              if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
                  // View was rejected last time it was drawn by its parent; this may have changed
                  invalidateParentIfNeeded();
              }
          }
      }
  
      /**
       * Bottom position of this view relative to its parent.
       *
       * @return The bottom of this view, in pixels.
       */
      @ViewDebug.CapturedViewProperty
      public final int getBottom() {
          return mBottom;
      }
  
      /**
       * True if this view has changed since the last time being drawn.
       *
       * @return The dirty state of this view.
       */
      public boolean isDirty() {
          return (mPrivateFlags & PFLAG_DIRTY_MASK) != 0;
      }
  
      /**
       * Sets the bottom position of this view relative to its parent. This method is meant to be
       * called by the layout system and should not generally be called otherwise, because the
       * property may be changed at any time by the layout.
       *
       * @param bottom The bottom of this view, in pixels.
       */
      public final void setBottom(int bottom) {
          if (bottom != mBottom) {
              final boolean matrixIsIdentity = hasIdentityMatrix();
              if (matrixIsIdentity) {
                  if (mAttachInfo != null) {
                      int maxBottom;
                      if (bottom < mBottom) {
                          maxBottom = mBottom;
                      } else {
                          maxBottom = bottom;
                      }
                      invalidate(0, 0, mRight - mLeft, maxBottom - mTop);
                  }
              } else {
                  // Double-invalidation is necessary to capture view's old and new areas
                  invalidate(true);
              }
  
              int width = mRight - mLeft;
              int oldHeight = mBottom - mTop;
  
              mBottom = bottom;
              mRenderNode.setBottom(mBottom);
  
              sizeChange(width, mBottom - mTop, width, oldHeight);
  
              if (!matrixIsIdentity) {
                  mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation
                  invalidate(true);
              }
              mBackgroundSizeChanged = true;
              mDefaultFocusHighlightSizeChanged = true;
              if (mForegroundInfo != null) {
                  mForegroundInfo.mBoundsChanged = true;
              }
              invalidateParentIfNeeded();
              if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
                  // View was rejected last time it was drawn by its parent; this may have changed
                  invalidateParentIfNeeded();
              }
          }
      }
  
      /**
       * Left position of this view relative to its parent.
       *
       * @return The left edge of this view, in pixels.
       */
      @ViewDebug.CapturedViewProperty
      public final int getLeft() {
          return mLeft;
      }
  
      /**
       * Sets the left position of this view relative to its parent. This method is meant to be called
       * by the layout system and should not generally be called otherwise, because the property
       * may be changed at any time by the layout.
       *
       * @param left The left of this view, in pixels.
       */
      public final void setLeft(int left) {
          if (left != mLeft) {
              final boolean matrixIsIdentity = hasIdentityMatrix();
              if (matrixIsIdentity) {
                  if (mAttachInfo != null) {
                      int minLeft;
                      int xLoc;
                      if (left < mLeft) {
                          minLeft = left;
                          xLoc = left - mLeft;
                      } else {
                          minLeft = mLeft;
                          xLoc = 0;
                      }
                      invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop);
                  }
              } else {
                  // Double-invalidation is necessary to capture view's old and new areas
                  invalidate(true);
              }
  
              int oldWidth = mRight - mLeft;
              int height = mBottom - mTop;
  
              mLeft = left;
              mRenderNode.setLeft(left);
  
              sizeChange(mRight - mLeft, height, oldWidth, height);
  
              if (!matrixIsIdentity) {
                  mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation
                  invalidate(true);
              }
              mBackgroundSizeChanged = true;
              mDefaultFocusHighlightSizeChanged = true;
              if (mForegroundInfo != null) {
                  mForegroundInfo.mBoundsChanged = true;
              }
              invalidateParentIfNeeded();
              if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
                  // View was rejected last time it was drawn by its parent; this may have changed
                  invalidateParentIfNeeded();
              }
          }
      }
  
      /**
       * Right position of this view relative to its parent.
       *
       * @return The right edge of this view, in pixels.
       */
      @ViewDebug.CapturedViewProperty
      public final int getRight() {
          return mRight;
      }
  
      /**
       * Sets the right position of this view relative to its parent. This method is meant to be called
       * by the layout system and should not generally be called otherwise, because the property
       * may be changed at any time by the layout.
       *
       * @param right The right of this view, in pixels.
       */
      public final void setRight(int right) {
          if (right != mRight) {
              final boolean matrixIsIdentity = hasIdentityMatrix();
              if (matrixIsIdentity) {
                  if (mAttachInfo != null) {
                      int maxRight;
                      if (right < mRight) {
                          maxRight = mRight;
                      } else {
                          maxRight = right;
                      }
                      invalidate(0, 0, maxRight - mLeft, mBottom - mTop);
                  }
              } else {
                  // Double-invalidation is necessary to capture view's old and new areas
                  invalidate(true);
              }
  
              int oldWidth = mRight - mLeft;
              int height = mBottom - mTop;
  
              mRight = right;
              mRenderNode.setRight(mRight);
  
              sizeChange(mRight - mLeft, height, oldWidth, height);
  
              if (!matrixIsIdentity) {
                  mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation
                  invalidate(true);
              }
              mBackgroundSizeChanged = true;
              mDefaultFocusHighlightSizeChanged = true;
              if (mForegroundInfo != null) {
                  mForegroundInfo.mBoundsChanged = true;
              }
              invalidateParentIfNeeded();
              if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
                  // View was rejected last time it was drawn by its parent; this may have changed
                  invalidateParentIfNeeded();
              }
          }
      }
  
      private static float sanitizeFloatPropertyValue(float value, String propertyName) {
          return sanitizeFloatPropertyValue(value, propertyName, -Float.MAX_VALUE, Float.MAX_VALUE);
      }
  
      private static float sanitizeFloatPropertyValue(float value, String propertyName,
              float min, float max) {
          // The expected "nothing bad happened" path
          if (value >= min && value <= max) return value;
  
          if (value < min || value == Float.NEGATIVE_INFINITY) {
              if (sThrowOnInvalidFloatProperties) {
                  throw new IllegalArgumentException("Cannot set '" + propertyName + "' to "
                          + value + ", the value must be >= " + min);
              }
              return min;
          }
  
          if (value > max || value == Float.POSITIVE_INFINITY) {
              if (sThrowOnInvalidFloatProperties) {
                  throw new IllegalArgumentException("Cannot set '" + propertyName + "' to "
                          + value + ", the value must be <= " + max);
              }
              return max;
          }
  
          if (Float.isNaN(value)) {
              if (sThrowOnInvalidFloatProperties) {
                  throw new IllegalArgumentException(
                          "Cannot set '" + propertyName + "' to Float.NaN");
              }
              return 0; // Unclear which direction this NaN went so... 0?
          }
  
          // Shouldn't be possible to reach this.
          throw new IllegalStateException("How do you get here?? " + value);
      }
  
      /**
       * The visual x position of this view, in pixels. This is equivalent to the
       * {@link #setTranslationX(float) translationX} property plus the current
       * {@link #getLeft() left} property.
       *
       * @return The visual x position of this view, in pixels.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      public float getX() {
          return mLeft + getTranslationX();
      }
  
      /**
       * Sets the visual x position of this view, in pixels. This is equivalent to setting the
       * {@link #setTranslationX(float) translationX} property to be the difference between
       * the x value passed in and the current {@link #getLeft() left} property.
       *
       * @param x The visual x position of this view, in pixels.
       */
      public void setX(float x) {
          setTranslationX(x - mLeft);
      }
  
      /**
       * The visual y position of this view, in pixels. This is equivalent to the
       * {@link #setTranslationY(float) translationY} property plus the current
       * {@link #getTop() top} property.
       *
       * @return The visual y position of this view, in pixels.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      public float getY() {
          return mTop + getTranslationY();
      }
  
      /**
       * Sets the visual y position of this view, in pixels. This is equivalent to setting the
       * {@link #setTranslationY(float) translationY} property to be the difference between
       * the y value passed in and the current {@link #getTop() top} property.
       *
       * @param y The visual y position of this view, in pixels.
       */
      public void setY(float y) {
          setTranslationY(y - mTop);
      }
  
      /**
       * The visual z position of this view, in pixels. This is equivalent to the
       * {@link #setTranslationZ(float) translationZ} property plus the current
       * {@link #getElevation() elevation} property.
       *
       * @return The visual z position of this view, in pixels.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      public float getZ() {
          return getElevation() + getTranslationZ();
      }
  
      /**
       * Sets the visual z position of this view, in pixels. This is equivalent to setting the
       * {@link #setTranslationZ(float) translationZ} property to be the difference between
       * the z value passed in and the current {@link #getElevation() elevation} property.
       *
       * @param z The visual z position of this view, in pixels.
       */
      public void setZ(float z) {
          setTranslationZ(z - getElevation());
      }
  
      /**
       * The base elevation of this view relative to its parent, in pixels.
       *
       * @return The base depth position of the view, in pixels.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      @InspectableProperty
      public float getElevation() {
          return mRenderNode.getElevation();
      }
  
      /**
       * Sets the base elevation of this view, in pixels.
       *
       * @attr ref android.R.styleable#View_elevation
       */
      public void setElevation(float elevation) {
          if (elevation != getElevation()) {
              elevation = sanitizeFloatPropertyValue(elevation, "elevation");
              invalidateViewProperty(true, false);
              mRenderNode.setElevation(elevation);
              invalidateViewProperty(false, true);
  
              invalidateParentIfNeededAndWasQuickRejected();
          }
      }
  
      /**
       * The horizontal location of this view relative to its {@link #getLeft() left} position.
       * This position is post-layout, in addition to wherever the object's
       * layout placed it.
       *
       * @return The horizontal position of this view relative to its left position, in pixels.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      @InspectableProperty
      public float getTranslationX() {
          return mRenderNode.getTranslationX();
      }
  
      /**
       * Sets the horizontal location of this view relative to its {@link #getLeft() left} position.
       * This effectively positions the object post-layout, in addition to wherever the object's
       * layout placed it.
       *
       * @param translationX The horizontal position of this view relative to its left position,
       * in pixels.
       *
       * @attr ref android.R.styleable#View_translationX
       */
      public void setTranslationX(float translationX) {
          if (translationX != getTranslationX()) {
              invalidateViewProperty(true, false);
              mRenderNode.setTranslationX(translationX);
              invalidateViewProperty(false, true);
  
              invalidateParentIfNeededAndWasQuickRejected();
              notifySubtreeAccessibilityStateChangedIfNeeded();
          }
      }
  
      /**
       * The vertical location of this view relative to its {@link #getTop() top} position.
       * This position is post-layout, in addition to wherever the object's
       * layout placed it.
       *
       * @return The vertical position of this view relative to its top position,
       * in pixels.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      @InspectableProperty
      public float getTranslationY() {
          return mRenderNode.getTranslationY();
      }
  
      /**
       * Sets the vertical location of this view relative to its {@link #getTop() top} position.
       * This effectively positions the object post-layout, in addition to wherever the object's
       * layout placed it.
       *
       * @param translationY The vertical position of this view relative to its top position,
       * in pixels.
       *
       * @attr ref android.R.styleable#View_translationY
       */
      public void setTranslationY(float translationY) {
          if (translationY != getTranslationY()) {
              invalidateViewProperty(true, false);
              mRenderNode.setTranslationY(translationY);
              invalidateViewProperty(false, true);
  
              invalidateParentIfNeededAndWasQuickRejected();
              notifySubtreeAccessibilityStateChangedIfNeeded();
          }
      }
  
      /**
       * The depth location of this view relative to its {@link #getElevation() elevation}.
       *
       * @return The depth of this view relative to its elevation.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      @InspectableProperty
      public float getTranslationZ() {
          return mRenderNode.getTranslationZ();
      }
  
      /**
       * Sets the depth location of this view relative to its {@link #getElevation() elevation}.
       *
       * @attr ref android.R.styleable#View_translationZ
       */
      public void setTranslationZ(float translationZ) {
          if (translationZ != getTranslationZ()) {
              translationZ = sanitizeFloatPropertyValue(translationZ, "translationZ");
              invalidateViewProperty(true, false);
              mRenderNode.setTranslationZ(translationZ);
              invalidateViewProperty(false, true);
  
              invalidateParentIfNeededAndWasQuickRejected();
          }
      }
  
      /**
       * Changes the transformation matrix on the view. This is used in animation frameworks,
       * such as {@link android.transition.Transition}. When the animation finishes, the matrix
       * should be cleared by calling this method with <code>null</code> as the matrix parameter.
       * Application developers should use transformation methods like {@link #setRotation(float)},
       * {@link #setScaleX(float)}, {@link #setScaleX(float)}, {@link #setTranslationX(float)}}
       * and {@link #setTranslationY(float)} (float)}} instead.
       *
       * @param matrix The matrix, null indicates that the matrix should be cleared.
       * @see #getAnimationMatrix()
       */
      public void setAnimationMatrix(@Nullable Matrix matrix) {
          invalidateViewProperty(true, false);
          mRenderNode.setAnimationMatrix(matrix);
          invalidateViewProperty(false, true);
  
          invalidateParentIfNeededAndWasQuickRejected();
      }
  
      /**
       * Return the current transformation matrix of the view. This is used in animation frameworks,
       * such as {@link android.transition.Transition}. Returns <code>null</code> when there is no
       * transformation provided by {@link #setAnimationMatrix(Matrix)}.
       * Application developers should use transformation methods like {@link #setRotation(float)},
       * {@link #setScaleX(float)}, {@link #setScaleX(float)}, {@link #setTranslationX(float)}}
       * and {@link #setTranslationY(float)} (float)}} instead.
       *
       * @return the Matrix, null indicates there is no transformation
       * @see #setAnimationMatrix(Matrix)
       */
      @Nullable
      public Matrix getAnimationMatrix() {
          return mRenderNode.getAnimationMatrix();
      }
  
      /**
       * Returns the current StateListAnimator if exists.
       *
       * @return StateListAnimator or null if it does not exists
       * @see    #setStateListAnimator(android.animation.StateListAnimator)
       */
      @InspectableProperty
      public StateListAnimator getStateListAnimator() {
          return mStateListAnimator;
      }
  
      /**
       * Attaches the provided StateListAnimator to this View.
       * <p>
       * Any previously attached StateListAnimator will be detached.
       *
       * @param stateListAnimator The StateListAnimator to update the view
       * @see android.animation.StateListAnimator
       */
      public void setStateListAnimator(StateListAnimator stateListAnimator) {
          if (mStateListAnimator == stateListAnimator) {
              return;
          }
          if (mStateListAnimator != null) {
              mStateListAnimator.setTarget(null);
          }
          mStateListAnimator = stateListAnimator;
          if (stateListAnimator != null) {
              stateListAnimator.setTarget(this);
              if (isAttachedToWindow()) {
                  stateListAnimator.setState(getDrawableState());
              }
          }
      }
  
      /**
       * Returns whether the Outline should be used to clip the contents of the View.
       * <p>
       * Note that this flag will only be respected if the View's Outline returns true from
       * {@link Outline#canClip()}.
       *
       * @see #setOutlineProvider(ViewOutlineProvider)
       * @see #setClipToOutline(boolean)
       */
      public final boolean getClipToOutline() {
          return mRenderNode.getClipToOutline();
      }
  
      /**
       * Sets whether the View's Outline should be used to clip the contents of the View.
       * <p>
       * Only a single non-rectangular clip can be applied on a View at any time.
       * Circular clips from a {@link ViewAnimationUtils#createCircularReveal(View, int, int, float, float)
       * circular reveal} animation take priority over Outline clipping, and
       * child Outline clipping takes priority over Outline clipping done by a
       * parent.
       * <p>
       * Note that this flag will only be respected if the View's Outline returns true from
       * {@link Outline#canClip()}.
       *
       * @see #setOutlineProvider(ViewOutlineProvider)
       * @see #getClipToOutline()
       */
      public void setClipToOutline(boolean clipToOutline) {
          damageInParent();
          if (getClipToOutline() != clipToOutline) {
              mRenderNode.setClipToOutline(clipToOutline);
          }
      }
  
      // correspond to the enum values of View_outlineProvider
      private static final int PROVIDER_BACKGROUND = 0;
      private static final int PROVIDER_NONE = 1;
      private static final int PROVIDER_BOUNDS = 2;
      private static final int PROVIDER_PADDED_BOUNDS = 3;
      private void setOutlineProviderFromAttribute(int providerInt) {
          switch (providerInt) {
              case PROVIDER_BACKGROUND:
                  setOutlineProvider(ViewOutlineProvider.BACKGROUND);
                  break;
              case PROVIDER_NONE:
                  setOutlineProvider(null);
                  break;
              case PROVIDER_BOUNDS:
                  setOutlineProvider(ViewOutlineProvider.BOUNDS);
                  break;
              case PROVIDER_PADDED_BOUNDS:
                  setOutlineProvider(ViewOutlineProvider.PADDED_BOUNDS);
                  break;
          }
      }
  
      /**
       * Sets the {@link ViewOutlineProvider} of the view, which generates the Outline that defines
       * the shape of the shadow it casts, and enables outline clipping.
       * <p>
       * The default ViewOutlineProvider, {@link ViewOutlineProvider#BACKGROUND}, queries the Outline
       * from the View's background drawable, via {@link Drawable#getOutline(Outline)}. Changing the
       * outline provider with this method allows this behavior to be overridden.
       * <p>
       * If the ViewOutlineProvider is null, if querying it for an outline returns false,
       * or if the produced Outline is {@link Outline#isEmpty()}, shadows will not be cast.
       * <p>
       * Only outlines that return true from {@link Outline#canClip()} may be used for clipping.
       *
       * @see #setClipToOutline(boolean)
       * @see #getClipToOutline()
       * @see #getOutlineProvider()
       */
      public void setOutlineProvider(ViewOutlineProvider provider) {
          mOutlineProvider = provider;
          invalidateOutline();
      }
  
      /**
       * Returns the current {@link ViewOutlineProvider} of the view, which generates the Outline
       * that defines the shape of the shadow it casts, and enables outline clipping.
       *
       * @see #setOutlineProvider(ViewOutlineProvider)
       */
      @InspectableProperty
      public ViewOutlineProvider getOutlineProvider() {
          return mOutlineProvider;
      }
  
      /**
       * Called to rebuild this View's Outline from its {@link ViewOutlineProvider outline provider}
       *
       * @see #setOutlineProvider(ViewOutlineProvider)
       */
      public void invalidateOutline() {
          rebuildOutline();
  
          notifySubtreeAccessibilityStateChangedIfNeeded();
          invalidateViewProperty(false, false);
      }
  
      /**
       * Internal version of {@link #invalidateOutline()} which invalidates the
       * outline without invalidating the view itself. This is intended to be called from
       * within methods in the View class itself which are the result of the view being
       * invalidated already. For example, when we are drawing the background of a View,
       * we invalidate the outline in case it changed in the meantime, but we do not
       * need to invalidate the view because we're already drawing the background as part
       * of drawing the view in response to an earlier invalidation of the view.
       */
      private void rebuildOutline() {
          // Unattached views ignore this signal, and outline is recomputed in onAttachedToWindow()
          if (mAttachInfo == null) return;
  
          if (mOutlineProvider == null) {
              // no provider, remove outline
              mRenderNode.setOutline(null);
          } else {
              final Outline outline = mAttachInfo.mTmpOutline;
              outline.setEmpty();
              outline.setAlpha(1.0f);
  
              mOutlineProvider.getOutline(this, outline);
              mRenderNode.setOutline(outline);
          }
      }
  
      /**
       * HierarchyViewer only
       *
       * @hide
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      public boolean hasShadow() {
          return mRenderNode.hasShadow();
      }
  
      /**
       * Sets the color of the spot shadow that is drawn when the view has a positive Z or
       * elevation value.
       * <p>
       * By default the shadow color is black. Generally, this color will be opaque so the intensity
       * of the shadow is consistent between different views with different colors.
       * <p>
       * The opacity of the final spot shadow is a function of the shadow caster height, the
       * alpha channel of the outlineSpotShadowColor (typically opaque), and the
       * {@link android.R.attr#spotShadowAlpha} theme attribute.
       *
       * @attr ref android.R.styleable#View_outlineSpotShadowColor
       * @param color The color this View will cast for its elevation spot shadow.
       */
      public void setOutlineSpotShadowColor(@ColorInt int color) {
          if (mRenderNode.setSpotShadowColor(color)) {
              invalidateViewProperty(true, true);
          }
      }
  
      /**
       * @return The shadow color set by {@link #setOutlineSpotShadowColor(int)}, or black if nothing
       * was set
       */
      @InspectableProperty
      public @ColorInt int getOutlineSpotShadowColor() {
          return mRenderNode.getSpotShadowColor();
      }
  
      /**
       * Sets the color of the ambient shadow that is drawn when the view has a positive Z or
       * elevation value.
       * <p>
       * By default the shadow color is black. Generally, this color will be opaque so the intensity
       * of the shadow is consistent between different views with different colors.
       * <p>
       * The opacity of the final ambient shadow is a function of the shadow caster height, the
       * alpha channel of the outlineAmbientShadowColor (typically opaque), and the
       * {@link android.R.attr#ambientShadowAlpha} theme attribute.
       *
       * @attr ref android.R.styleable#View_outlineAmbientShadowColor
       * @param color The color this View will cast for its elevation shadow.
       */
      public void setOutlineAmbientShadowColor(@ColorInt int color) {
          if (mRenderNode.setAmbientShadowColor(color)) {
              invalidateViewProperty(true, true);
          }
      }
  
      /**
       * @return The shadow color set by {@link #setOutlineAmbientShadowColor(int)}, or black if
       * nothing was set
       */
      @InspectableProperty
      public @ColorInt int getOutlineAmbientShadowColor() {
          return mRenderNode.getAmbientShadowColor();
      }
  
  
      /** @hide */
      public void setRevealClip(boolean shouldClip, float x, float y, float radius) {
          mRenderNode.setRevealClip(shouldClip, x, y, radius);
          invalidateViewProperty(false, false);
      }
  
      /**
       * Hit rectangle in parent's coordinates
       *
       * @param outRect The hit rectangle of the view.
       */
      public void getHitRect(Rect outRect) {
          if (hasIdentityMatrix() || mAttachInfo == null) {
              outRect.set(mLeft, mTop, mRight, mBottom);
          } else {
              final RectF tmpRect = mAttachInfo.mTmpTransformRect;
              tmpRect.set(0, 0, getWidth(), getHeight());
              getMatrix().mapRect(tmpRect); // TODO: mRenderNode.mapRect(tmpRect)
              outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop,
                      (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop);
          }
      }
  
      /**
       * Determines whether the given point, in local coordinates is inside the view.
       */
      /*package*/ final boolean pointInView(float localX, float localY) {
          return pointInView(localX, localY, 0);
      }
  
      /**
       * Utility method to determine whether the given point, in local coordinates,
       * is inside the view, where the area of the view is expanded by the slop factor.
       * This method is called while processing touch-move events to determine if the event
       * is still within the view.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public boolean pointInView(float localX, float localY, float slop) {
          return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) &&
                  localY < ((mBottom - mTop) + slop);
      }
  
      /**
       * When a view has focus and the user navigates away from it, the next view is searched for
       * starting from the rectangle filled in by this method.
       *
       * By default, the rectangle is the {@link #getDrawingRect(android.graphics.Rect)})
       * of the view.  However, if your view maintains some idea of internal selection,
       * such as a cursor, or a selected row or column, you should override this method and
       * fill in a more specific rectangle.
       *
       * @param r The rectangle to fill in, in this view's coordinates.
       */
      public void getFocusedRect(Rect r) {
          getDrawingRect(r);
      }
  
      /**
       * If some part of this view is not clipped by any of its parents, then
       * return that area in r in global (root) coordinates. To convert r to local
       * coordinates (without taking possible View rotations into account), offset
       * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)).
       * If the view is completely clipped or translated out, return false.
       *
       * @param r If true is returned, r holds the global coordinates of the
       *        visible portion of this view.
       * @param globalOffset If true is returned, globalOffset holds the dx,dy
       *        between this view and its root. globalOffet may be null.
       * @return true if r is non-empty (i.e. part of the view is visible at the
       *         root level.
       */
      public boolean getGlobalVisibleRect(Rect r, Point globalOffset) {
          int width = mRight - mLeft;
          int height = mBottom - mTop;
          if (width > 0 && height > 0) {
              r.set(0, 0, width, height);
              if (globalOffset != null) {
                  globalOffset.set(-mScrollX, -mScrollY);
              }
              return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset);
          }
          return false;
      }
  
      public final boolean getGlobalVisibleRect(Rect r) {
          return getGlobalVisibleRect(r, null);
      }
  
      public final boolean getLocalVisibleRect(Rect r) {
          final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point();
          if (getGlobalVisibleRect(r, offset)) {
              r.offset(-offset.x, -offset.y); // make r local
              return true;
          }
          return false;
      }
  
      /**
       * Offset this view's vertical location by the specified number of pixels.
       *
       * @param offset the number of pixels to offset the view by
       */
      public void offsetTopAndBottom(int offset) {
          if (offset != 0) {
              final boolean matrixIsIdentity = hasIdentityMatrix();
              if (matrixIsIdentity) {
                  if (isHardwareAccelerated()) {
                      invalidateViewProperty(false, false);
                  } else {
                      final ViewParent p = mParent;
                      if (p != null && mAttachInfo != null) {
                          final Rect r = mAttachInfo.mTmpInvalRect;
                          int minTop;
                          int maxBottom;
                          int yLoc;
                          if (offset < 0) {
                              minTop = mTop + offset;
                              maxBottom = mBottom;
                              yLoc = offset;
                          } else {
                              minTop = mTop;
                              maxBottom = mBottom + offset;
                              yLoc = 0;
                          }
                          r.set(0, yLoc, mRight - mLeft, maxBottom - minTop);
                          p.invalidateChild(this, r);
                      }
                  }
              } else {
                  invalidateViewProperty(false, false);
              }
  
              mTop += offset;
              mBottom += offset;
              mRenderNode.offsetTopAndBottom(offset);
              if (isHardwareAccelerated()) {
                  invalidateViewProperty(false, false);
                  invalidateParentIfNeededAndWasQuickRejected();
              } else {
                  if (!matrixIsIdentity) {
                      invalidateViewProperty(false, true);
                  }
                  invalidateParentIfNeeded();
              }
              notifySubtreeAccessibilityStateChangedIfNeeded();
          }
      }
  
      /**
       * Offset this view's horizontal location by the specified amount of pixels.
       *
       * @param offset the number of pixels to offset the view by
       */
      public void offsetLeftAndRight(int offset) {
          if (offset != 0) {
              final boolean matrixIsIdentity = hasIdentityMatrix();
              if (matrixIsIdentity) {
                  if (isHardwareAccelerated()) {
                      invalidateViewProperty(false, false);
                  } else {
                      final ViewParent p = mParent;
                      if (p != null && mAttachInfo != null) {
                          final Rect r = mAttachInfo.mTmpInvalRect;
                          int minLeft;
                          int maxRight;
                          if (offset < 0) {
                              minLeft = mLeft + offset;
                              maxRight = mRight;
                          } else {
                              minLeft = mLeft;
                              maxRight = mRight + offset;
                          }
                          r.set(0, 0, maxRight - minLeft, mBottom - mTop);
                          p.invalidateChild(this, r);
                      }
                  }
              } else {
                  invalidateViewProperty(false, false);
              }
  
              mLeft += offset;
              mRight += offset;
              mRenderNode.offsetLeftAndRight(offset);
              if (isHardwareAccelerated()) {
                  invalidateViewProperty(false, false);
                  invalidateParentIfNeededAndWasQuickRejected();
              } else {
                  if (!matrixIsIdentity) {
                      invalidateViewProperty(false, true);
                  }
                  invalidateParentIfNeeded();
              }
              notifySubtreeAccessibilityStateChangedIfNeeded();
          }
      }
  
      /**
       * Get the LayoutParams associated with this view. All views should have
       * layout parameters. These supply parameters to the <i>parent</i> of this
       * view specifying how it should be arranged. There are many subclasses of
       * ViewGroup.LayoutParams, and these correspond to the different subclasses
       * of ViewGroup that are responsible for arranging their children.
       *
       * This method may return null if this View is not attached to a parent
       * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)}
       * was not invoked successfully. When a View is attached to a parent
       * ViewGroup, this method must not return null.
       *
       * @return The LayoutParams associated with this view, or null if no
       *         parameters have been set yet
       */
      @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_")
      public ViewGroup.LayoutParams getLayoutParams() {
          return mLayoutParams;
      }
  
      /**
       * Set the layout parameters associated with this view. These supply
       * parameters to the <i>parent</i> of this view specifying how it should be
       * arranged. There are many subclasses of ViewGroup.LayoutParams, and these
       * correspond to the different subclasses of ViewGroup that are responsible
       * for arranging their children.
       *
       * @param params The layout parameters for this view, cannot be null
       */
      public void setLayoutParams(ViewGroup.LayoutParams params) {
          if (params == null) {
              throw new NullPointerException("Layout parameters cannot be null");
          }
          mLayoutParams = params;
          resolveLayoutParams();
          if (mParent instanceof ViewGroup) {
              ((ViewGroup) mParent).onSetLayoutParams(this, params);
          }
          requestLayout();
      }
  
      /**
       * Resolve the layout parameters depending on the resolved layout direction
       *
       * @hide
       */
      public void resolveLayoutParams() {
          if (mLayoutParams != null) {
              mLayoutParams.resolveLayoutDirection(getLayoutDirection());
          }
      }
  
      /**
       * Set the scrolled position of your view. This will cause a call to
       * {@link #onScrollChanged(int, int, int, int)} and the view will be
       * invalidated.
       * @param x the x position to scroll to
       * @param y the y position to scroll to
       */
      public void scrollTo(int x, int y) {
          if (mScrollX != x || mScrollY != y) {
              int oldX = mScrollX;
              int oldY = mScrollY;
              mScrollX = x;
              mScrollY = y;
              invalidateParentCaches();
              onScrollChanged(mScrollX, mScrollY, oldX, oldY);
              if (!awakenScrollBars()) {
                  postInvalidateOnAnimation();
              }
          }
      }
  
      /**
       * Move the scrolled position of your view. This will cause a call to
       * {@link #onScrollChanged(int, int, int, int)} and the view will be
       * invalidated.
       * @param x the amount of pixels to scroll by horizontally
       * @param y the amount of pixels to scroll by vertically
       */
      public void scrollBy(int x, int y) {
          scrollTo(mScrollX + x, mScrollY + y);
      }
  
      /**
       * <p>Trigger the scrollbars to draw. When invoked this method starts an
       * animation to fade the scrollbars out after a default delay. If a subclass
       * provides animated scrolling, the start delay should equal the duration
       * of the scrolling animation.</p>
       *
       * <p>The animation starts only if at least one of the scrollbars is
       * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and
       * {@link #isVerticalScrollBarEnabled()}. When the animation is started,
       * this method returns true, and false otherwise. If the animation is
       * started, this method calls {@link #invalidate()}; in that case the
       * caller should not call {@link #invalidate()}.</p>
       *
       * <p>This method should be invoked every time a subclass directly updates
       * the scroll parameters.</p>
       *
       * <p>This method is automatically invoked by {@link #scrollBy(int, int)}
       * and {@link #scrollTo(int, int)}.</p>
       *
       * @return true if the animation is played, false otherwise
       *
       * @see #awakenScrollBars(int)
       * @see #scrollBy(int, int)
       * @see #scrollTo(int, int)
       * @see #isHorizontalScrollBarEnabled()
       * @see #isVerticalScrollBarEnabled()
       * @see #setHorizontalScrollBarEnabled(boolean)
       * @see #setVerticalScrollBarEnabled(boolean)
       */
      protected boolean awakenScrollBars() {
          return mScrollCache != null &&
                  awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true);
      }
  
      /**
       * Trigger the scrollbars to draw.
       * This method differs from awakenScrollBars() only in its default duration.
       * initialAwakenScrollBars() will show the scroll bars for longer than
       * usual to give the user more of a chance to notice them.
       *
       * @return true if the animation is played, false otherwise.
       */
      private boolean initialAwakenScrollBars() {
          return mScrollCache != null &&
                  awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true);
      }
  
      /**
       * <p>
       * Trigger the scrollbars to draw. When invoked this method starts an
       * animation to fade the scrollbars out after a fixed delay. If a subclass
       * provides animated scrolling, the start delay should equal the duration of
       * the scrolling animation.
       * </p>
       *
       * <p>
       * The animation starts only if at least one of the scrollbars is enabled,
       * as specified by {@link #isHorizontalScrollBarEnabled()} and
       * {@link #isVerticalScrollBarEnabled()}. When the animation is started,
       * this method returns true, and false otherwise. If the animation is
       * started, this method calls {@link #invalidate()}; in that case the caller
       * should not call {@link #invalidate()}.
       * </p>
       *
       * <p>
       * This method should be invoked every time a subclass directly updates the
       * scroll parameters.
       * </p>
       *
       * @param startDelay the delay, in milliseconds, after which the animation
       *        should start; when the delay is 0, the animation starts
       *        immediately
       * @return true if the animation is played, false otherwise
       *
       * @see #scrollBy(int, int)
       * @see #scrollTo(int, int)
       * @see #isHorizontalScrollBarEnabled()
       * @see #isVerticalScrollBarEnabled()
       * @see #setHorizontalScrollBarEnabled(boolean)
       * @see #setVerticalScrollBarEnabled(boolean)
       */
      protected boolean awakenScrollBars(int startDelay) {
          return awakenScrollBars(startDelay, true);
      }
  
      /**
       * <p>
       * Trigger the scrollbars to draw. When invoked this method starts an
       * animation to fade the scrollbars out after a fixed delay. If a subclass
       * provides animated scrolling, the start delay should equal the duration of
       * the scrolling animation.
       * </p>
       *
       * <p>
       * The animation starts only if at least one of the scrollbars is enabled,
       * as specified by {@link #isHorizontalScrollBarEnabled()} and
       * {@link #isVerticalScrollBarEnabled()}. When the animation is started,
       * this method returns true, and false otherwise. If the animation is
       * started, this method calls {@link #invalidate()} if the invalidate parameter
       * is set to true; in that case the caller
       * should not call {@link #invalidate()}.
       * </p>
       *
       * <p>
       * This method should be invoked every time a subclass directly updates the
       * scroll parameters.
       * </p>
       *
       * @param startDelay the delay, in milliseconds, after which the animation
       *        should start; when the delay is 0, the animation starts
       *        immediately
       *
       * @param invalidate Whether this method should call invalidate
       *
       * @return true if the animation is played, false otherwise
       *
       * @see #scrollBy(int, int)
       * @see #scrollTo(int, int)
       * @see #isHorizontalScrollBarEnabled()
       * @see #isVerticalScrollBarEnabled()
       * @see #setHorizontalScrollBarEnabled(boolean)
       * @see #setVerticalScrollBarEnabled(boolean)
       */
      protected boolean awakenScrollBars(int startDelay, boolean invalidate) {
          final ScrollabilityCache scrollCache = mScrollCache;
  
          if (scrollCache == null || !scrollCache.fadeScrollBars) {
              return false;
          }
  
          if (scrollCache.scrollBar == null) {
              scrollCache.scrollBar = new ScrollBarDrawable();
              scrollCache.scrollBar.setState(getDrawableState());
              scrollCache.scrollBar.setCallback(this);
          }
  
          if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) {
  
              if (invalidate) {
                  // Invalidate to show the scrollbars
                  postInvalidateOnAnimation();
              }
  
              if (scrollCache.state == ScrollabilityCache.OFF) {
                  // FIXME: this is copied from WindowManagerService.
                  // We should get this value from the system when it
                  // is possible to do so.
                  final int KEY_REPEAT_FIRST_DELAY = 750;
                  startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay);
              }
  
              // Tell mScrollCache when we should start fading. This may
              // extend the fade start time if one was already scheduled
              long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay;
              scrollCache.fadeStartTime = fadeStartTime;
              scrollCache.state = ScrollabilityCache.ON;
  
              // Schedule our fader to run, unscheduling any old ones first
              if (mAttachInfo != null) {
                  mAttachInfo.mHandler.removeCallbacks(scrollCache);
                  mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime);
              }
  
              return true;
          }
  
          return false;
      }
  
      /**
       * Do not invalidate views which are not visible and which are not running an animation. They
       * will not get drawn and they should not set dirty flags as if they will be drawn
       */
      private boolean skipInvalidate() {
          return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null &&
                  (!(mParent instanceof ViewGroup) ||
                          !((ViewGroup) mParent).isViewTransitioning(this));
      }
  
      /**
       * Mark the area defined by dirty as needing to be drawn. If the view is
       * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some
       * point in the future.
       * <p>
       * This must be called from a UI thread. To call from a non-UI thread, call
       * {@link #postInvalidate()}.
       * <p>
       * <b>WARNING:</b> In API 19 and below, this method may be destructive to
       * {@code dirty}.
       *
       * @param dirty the rectangle representing the bounds of the dirty region
       *
       * @deprecated The switch to hardware accelerated rendering in API 14 reduced
       * the importance of the dirty rectangle. In API 21 the given rectangle is
       * ignored entirely in favor of an internally-calculated area instead.
       * Because of this, clients are encouraged to just call {@link #invalidate()}.
       */
      @Deprecated
      public void invalidate(Rect dirty) {
          final int scrollX = mScrollX;
          final int scrollY = mScrollY;
          invalidateInternal(dirty.left - scrollX, dirty.top - scrollY,
                  dirty.right - scrollX, dirty.bottom - scrollY, true, false);
      }
  
      /**
       * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. The
       * coordinates of the dirty rect are relative to the view. If the view is
       * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some
       * point in the future.
       * <p>
       * This must be called from a UI thread. To call from a non-UI thread, call
       * {@link #postInvalidate()}.
       *
       * @param l the left position of the dirty region
       * @param t the top position of the dirty region
       * @param r the right position of the dirty region
       * @param b the bottom position of the dirty region
       *
       * @deprecated The switch to hardware accelerated rendering in API 14 reduced
       * the importance of the dirty rectangle. In API 21 the given rectangle is
       * ignored entirely in favor of an internally-calculated area instead.
       * Because of this, clients are encouraged to just call {@link #invalidate()}.
       */
      @Deprecated
      public void invalidate(int l, int t, int r, int b) {
          final int scrollX = mScrollX;
          final int scrollY = mScrollY;
          invalidateInternal(l - scrollX, t - scrollY, r - scrollX, b - scrollY, true, false);
      }
  
      /**
       * Invalidate the whole view. If the view is visible,
       * {@link #onDraw(android.graphics.Canvas)} will be called at some point in
       * the future.
       * <p>
       * This must be called from a UI thread. To call from a non-UI thread, call
       * {@link #postInvalidate()}.
       */
      public void invalidate() {
          invalidate(true);
      }
  
      /**
       * This is where the invalidate() work actually happens. A full invalidate()
       * causes the drawing cache to be invalidated, but this function can be
       * called with invalidateCache set to false to skip that invalidation step
       * for cases that do not need it (for example, a component that remains at
       * the same dimensions with the same content).
       *
       * @param invalidateCache Whether the drawing cache for this view should be
       *            invalidated as well. This is usually true for a full
       *            invalidate, but may be set to false if the View's contents or
       *            dimensions have not changed.
       * @hide
       */
      @UnsupportedAppUsage
      public void invalidate(boolean invalidateCache) {
          invalidateInternal(0, 0, mRight - mLeft, mBottom - mTop, invalidateCache, true);
      }
  
      void invalidateInternal(int l, int t, int r, int b, boolean invalidateCache,
              boolean fullInvalidate) {
          if (mGhostView != null) {
              mGhostView.invalidate(true);
              return;
          }
  
          if (skipInvalidate()) {
              return;
          }
  
          // Reset content capture caches
          mPrivateFlags4 &= ~PFLAG4_CONTENT_CAPTURE_IMPORTANCE_MASK;
          mCachedContentCaptureSession = null;
  
          if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)
                  || (invalidateCache && (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID)
                  || (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED
                  || (fullInvalidate && isOpaque() != mLastIsOpaque)) {
              if (fullInvalidate) {
                  mLastIsOpaque = isOpaque();
                  mPrivateFlags &= ~PFLAG_DRAWN;
              }
  
              mPrivateFlags |= PFLAG_DIRTY;
  
              if (invalidateCache) {
                  mPrivateFlags |= PFLAG_INVALIDATED;
                  mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
              }
  
              // Propagate the damage rectangle to the parent view.
              final AttachInfo ai = mAttachInfo;
              final ViewParent p = mParent;
              if (p != null && ai != null && l < r && t < b) {
                  final Rect damage = ai.mTmpInvalRect;
                  damage.set(l, t, r, b);
                  p.invalidateChild(this, damage);
              }
  
              // Damage the entire projection receiver, if necessary.
              if (mBackground != null && mBackground.isProjected()) {
                  final View receiver = getProjectionReceiver();
                  if (receiver != null) {
                      receiver.damageInParent();
                  }
              }
          }
      }
  
      /**
       * @return this view's projection receiver, or {@code null} if none exists
       */
      private View getProjectionReceiver() {
          ViewParent p = getParent();
          while (p != null && p instanceof View) {
              final View v = (View) p;
              if (v.isProjectionReceiver()) {
                  return v;
              }
              p = p.getParent();
          }
  
          return null;
      }
  
      /**
       * @return whether the view is a projection receiver
       */
      private boolean isProjectionReceiver() {
          return mBackground != null;
      }
  
      /**
       * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to
       * set any flags or handle all of the cases handled by the default invalidation methods.
       * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate
       * dirty rect. This method calls into fast invalidation methods in ViewGroup that
       * walk up the hierarchy, transforming the dirty rect as necessary.
       *
       * The method also handles normal invalidation logic if display list properties are not
       * being used in this view. The invalidateParent and forceRedraw flags are used by that
       * backup approach, to handle these cases used in the various property-setting methods.
       *
       * @param invalidateParent Force a call to invalidateParentCaches() if display list properties
       * are not being used in this view
       * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display
       * list properties are not being used in this view
       */
      @UnsupportedAppUsage
      void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) {
          if (!isHardwareAccelerated()
                  || !mRenderNode.hasDisplayList()
                  || (mPrivateFlags & PFLAG_DRAW_ANIMATION) != 0) {
              if (invalidateParent) {
                  invalidateParentCaches();
              }
              if (forceRedraw) {
                  mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation
              }
              invalidate(false);
          } else {
              damageInParent();
          }
      }
  
      /**
       * Tells the parent view to damage this view's bounds.
       *
       * @hide
       */
      protected void damageInParent() {
          if (mParent != null && mAttachInfo != null) {
              mParent.onDescendantInvalidated(this, this);
          }
      }
  
      /**
       * Used to indicate that the parent of this view should clear its caches. This functionality
       * is used to force the parent to rebuild its display list (when hardware-accelerated),
       * which is necessary when various parent-managed properties of the view change, such as
       * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only
       * clears the parent caches and does not causes an invalidate event.
       *
       * @hide
       */
      @UnsupportedAppUsage
      protected void invalidateParentCaches() {
          if (mParent instanceof View) {
              ((View) mParent).mPrivateFlags |= PFLAG_INVALIDATED;
          }
      }
  
      /**
       * Used to indicate that the parent of this view should be invalidated. This functionality
       * is used to force the parent to rebuild its display list (when hardware-accelerated),
       * which is necessary when various parent-managed properties of the view change, such as
       * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate
       * an invalidation event to the parent.
       *
       * @hide
       */
      @UnsupportedAppUsage
      protected void invalidateParentIfNeeded() {
          if (isHardwareAccelerated() && mParent instanceof View) {
              ((View) mParent).invalidate(true);
          }
      }
  
      /**
       * @hide
       */
      protected void invalidateParentIfNeededAndWasQuickRejected() {
          if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) != 0) {
              // View was rejected last time it was drawn by its parent; this may have changed
              invalidateParentIfNeeded();
          }
      }
  
      /**
       * Indicates whether this View is opaque. An opaque View guarantees that it will
       * draw all the pixels overlapping its bounds using a fully opaque color.
       *
       * Subclasses of View should override this method whenever possible to indicate
       * whether an instance is opaque. Opaque Views are treated in a special way by
       * the View hierarchy, possibly allowing it to perform optimizations during
       * invalidate/draw passes.
       *
       * @return True if this View is guaranteed to be fully opaque, false otherwise.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      public boolean isOpaque() {
          return (mPrivateFlags & PFLAG_OPAQUE_MASK) == PFLAG_OPAQUE_MASK &&
                  getFinalAlpha() >= 1.0f;
      }
  
      /**
       * @hide
       */
      @UnsupportedAppUsage
      protected void computeOpaqueFlags() {
          // Opaque if:
          //   - Has a background
          //   - Background is opaque
          //   - Doesn't have scrollbars or scrollbars overlay
  
          if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) {
              mPrivateFlags |= PFLAG_OPAQUE_BACKGROUND;
          } else {
              mPrivateFlags &= ~PFLAG_OPAQUE_BACKGROUND;
          }
  
          final int flags = mViewFlags;
          if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) ||
                  (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY ||
                  (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_OUTSIDE_OVERLAY) {
              mPrivateFlags |= PFLAG_OPAQUE_SCROLLBARS;
          } else {
              mPrivateFlags &= ~PFLAG_OPAQUE_SCROLLBARS;
          }
      }
  
      /**
       * @hide
       */
      protected boolean hasOpaqueScrollbars() {
          return (mPrivateFlags & PFLAG_OPAQUE_SCROLLBARS) == PFLAG_OPAQUE_SCROLLBARS;
      }
  
      /**
       * @return A handler associated with the thread running the View. This
       * handler can be used to pump events in the UI events queue.
       */
      public Handler getHandler() {
          final AttachInfo attachInfo = mAttachInfo;
          if (attachInfo != null) {
              return attachInfo.mHandler;
          }
          return null;
      }
  
      /**
       * Returns the queue of runnable for this view.
       *
       * @return the queue of runnables for this view
       */
      private HandlerActionQueue getRunQueue() {
          if (mRunQueue == null) {
              mRunQueue = new HandlerActionQueue();
          }
          return mRunQueue;
      }
  
      /**
       * Gets the view root associated with the View.
       * @return The view root, or null if none.
       * @hide
       */
      @UnsupportedAppUsage
      public ViewRootImpl getViewRootImpl() {
          if (mAttachInfo != null) {
              return mAttachInfo.mViewRootImpl;
          }
          return null;
      }
  
      /**
       * @hide
       */
      @UnsupportedAppUsage
      public ThreadedRenderer getThreadedRenderer() {
          return mAttachInfo != null ? mAttachInfo.mThreadedRenderer : null;
      }
  
      /**
       * <p>Causes the Runnable to be added to the message queue.
       * The runnable will be run on the user interface thread.</p>
       *
       * @param action The Runnable that will be executed.
       *
       * @return Returns true if the Runnable was successfully placed in to the
       *         message queue.  Returns false on failure, usually because the
       *         looper processing the message queue is exiting.
       *
       * @see #postDelayed
       * @see #removeCallbacks
       */
      public boolean post(Runnable action) {
          final AttachInfo attachInfo = mAttachInfo;
          if (attachInfo != null) {
              return attachInfo.mHandler.post(action);
          }
  
          // Postpone the runnable until we know on which thread it needs to run.
          // Assume that the runnable will be successfully placed after attach.
          getRunQueue().post(action);
          return true;
      }
  
      /**
       * <p>Causes the Runnable to be added to the message queue, to be run
       * after the specified amount of time elapses.
       * The runnable will be run on the user interface thread.</p>
       *
       * @param action The Runnable that will be executed.
       * @param delayMillis The delay (in milliseconds) until the Runnable
       *        will be executed.
       *
       * @return true if the Runnable was successfully placed in to the
       *         message queue.  Returns false on failure, usually because the
       *         looper processing the message queue is exiting.  Note that a
       *         result of true does not mean the Runnable will be processed --
       *         if the looper is quit before the delivery time of the message
       *         occurs then the message will be dropped.
       *
       * @see #post
       * @see #removeCallbacks
       */
      public boolean postDelayed(Runnable action, long delayMillis) {
          final AttachInfo attachInfo = mAttachInfo;
          if (attachInfo != null) {
              return attachInfo.mHandler.postDelayed(action, delayMillis);
          }
  
          // Postpone the runnable until we know on which thread it needs to run.
          // Assume that the runnable will be successfully placed after attach.
          getRunQueue().postDelayed(action, delayMillis);
          return true;
      }
  
      /**
       * <p>Causes the Runnable to execute on the next animation time step.
       * The runnable will be run on the user interface thread.</p>
       *
       * @param action The Runnable that will be executed.
       *
       * @see #postOnAnimationDelayed
       * @see #removeCallbacks
       */
      public void postOnAnimation(Runnable action) {
          final AttachInfo attachInfo = mAttachInfo;
          if (attachInfo != null) {
              attachInfo.mViewRootImpl.mChoreographer.postCallback(
                      Choreographer.CALLBACK_ANIMATION, action, null);
          } else {
              // Postpone the runnable until we know
              // on which thread it needs to run.
              getRunQueue().post(action);
          }
      }
  
      /**
       * <p>Causes the Runnable to execute on the next animation time step,
       * after the specified amount of time elapses.
       * The runnable will be run on the user interface thread.</p>
       *
       * @param action The Runnable that will be executed.
       * @param delayMillis The delay (in milliseconds) until the Runnable
       *        will be executed.
       *
       * @see #postOnAnimation
       * @see #removeCallbacks
       */
      public void postOnAnimationDelayed(Runnable action, long delayMillis) {
          final AttachInfo attachInfo = mAttachInfo;
          if (attachInfo != null) {
              attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed(
                      Choreographer.CALLBACK_ANIMATION, action, null, delayMillis);
          } else {
              // Postpone the runnable until we know
              // on which thread it needs to run.
              getRunQueue().postDelayed(action, delayMillis);
          }
      }
  
      /**
       * <p>Removes the specified Runnable from the message queue.</p>
       *
       * @param action The Runnable to remove from the message handling queue
       *
       * @return true if this view could ask the Handler to remove the Runnable,
       *         false otherwise. When the returned value is true, the Runnable
       *         may or may not have been actually removed from the message queue
       *         (for instance, if the Runnable was not in the queue already.)
       *
       * @see #post
       * @see #postDelayed
       * @see #postOnAnimation
       * @see #postOnAnimationDelayed
       */
      public boolean removeCallbacks(Runnable action) {
          if (action != null) {
              final AttachInfo attachInfo = mAttachInfo;
              if (attachInfo != null) {
                  attachInfo.mHandler.removeCallbacks(action);
                  attachInfo.mViewRootImpl.mChoreographer.removeCallbacks(
                          Choreographer.CALLBACK_ANIMATION, action, null);
              }
              getRunQueue().removeCallbacks(action);
          }
          return true;
      }
  
      /**
       * <p>Cause an invalidate to happen on a subsequent cycle through the event loop.
       * Use this to invalidate the View from a non-UI thread.</p>
       *
       * <p>This method can be invoked from outside of the UI thread
       * only when this View is attached to a window.</p>
       *
       * @see #invalidate()
       * @see #postInvalidateDelayed(long)
       */
      public void postInvalidate() {
          postInvalidateDelayed(0);
      }
  
      /**
       * <p>Cause an invalidate of the specified area to happen on a subsequent cycle
       * through the event loop. Use this to invalidate the View from a non-UI thread.</p>
       *
       * <p>This method can be invoked from outside of the UI thread
       * only when this View is attached to a window.</p>
       *
       * @param left The left coordinate of the rectangle to invalidate.
       * @param top The top coordinate of the rectangle to invalidate.
       * @param right The right coordinate of the rectangle to invalidate.
       * @param bottom The bottom coordinate of the rectangle to invalidate.
       *
       * @see #invalidate(int, int, int, int)
       * @see #invalidate(Rect)
       * @see #postInvalidateDelayed(long, int, int, int, int)
       */
      public void postInvalidate(int left, int top, int right, int bottom) {
          postInvalidateDelayed(0, left, top, right, bottom);
      }
  
      /**
       * <p>Cause an invalidate to happen on a subsequent cycle through the event
       * loop. Waits for the specified amount of time.</p>
       *
       * <p>This method can be invoked from outside of the UI thread
       * only when this View is attached to a window.</p>
       *
       * @param delayMilliseconds the duration in milliseconds to delay the
       *         invalidation by
       *
       * @see #invalidate()
       * @see #postInvalidate()
       */
      public void postInvalidateDelayed(long delayMilliseconds) {
          // We try only with the AttachInfo because there's no point in invalidating
          // if we are not attached to our window
          final AttachInfo attachInfo = mAttachInfo;
          if (attachInfo != null) {
              attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds);
          }
      }
  
      /**
       * <p>Cause an invalidate of the specified area to happen on a subsequent cycle
       * through the event loop. Waits for the specified amount of time.</p>
       *
       * <p>This method can be invoked from outside of the UI thread
       * only when this View is attached to a window.</p>
       *
       * @param delayMilliseconds the duration in milliseconds to delay the
       *         invalidation by
       * @param left The left coordinate of the rectangle to invalidate.
       * @param top The top coordinate of the rectangle to invalidate.
       * @param right The right coordinate of the rectangle to invalidate.
       * @param bottom The bottom coordinate of the rectangle to invalidate.
       *
       * @see #invalidate(int, int, int, int)
       * @see #invalidate(Rect)
       * @see #postInvalidate(int, int, int, int)
       */
      public void postInvalidateDelayed(long delayMilliseconds, int left, int top,
              int right, int bottom) {
  
          // We try only with the AttachInfo because there's no point in invalidating
          // if we are not attached to our window
          final AttachInfo attachInfo = mAttachInfo;
          if (attachInfo != null) {
              final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain();
              info.target = this;
              info.left = left;
              info.top = top;
              info.right = right;
              info.bottom = bottom;
  
              attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds);
          }
      }
  
      /**
       * <p>Cause an invalidate to happen on the next animation time step, typically the
       * next display frame.</p>
       *
       * <p>This method can be invoked from outside of the UI thread
       * only when this View is attached to a window.</p>
       *
       * @see #invalidate()
       */
      public void postInvalidateOnAnimation() {
          // We try only with the AttachInfo because there's no point in invalidating
          // if we are not attached to our window
          final AttachInfo attachInfo = mAttachInfo;
          if (attachInfo != null) {
              attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this);
          }
      }
  
      /**
       * <p>Cause an invalidate of the specified area to happen on the next animation
       * time step, typically the next display frame.</p>
       *
       * <p>This method can be invoked from outside of the UI thread
       * only when this View is attached to a window.</p>
       *
       * @param left The left coordinate of the rectangle to invalidate.
       * @param top The top coordinate of the rectangle to invalidate.
       * @param right The right coordinate of the rectangle to invalidate.
       * @param bottom The bottom coordinate of the rectangle to invalidate.
       *
       * @see #invalidate(int, int, int, int)
       * @see #invalidate(Rect)
       */
      public void postInvalidateOnAnimation(int left, int top, int right, int bottom) {
          // We try only with the AttachInfo because there's no point in invalidating
          // if we are not attached to our window
          final AttachInfo attachInfo = mAttachInfo;
          if (attachInfo != null) {
              final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain();
              info.target = this;
              info.left = left;
              info.top = top;
              info.right = right;
              info.bottom = bottom;
  
              attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info);
          }
      }
  
      /**
       * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event.
       * This event is sent at most once every
       * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}.
       */
      private void postSendViewScrolledAccessibilityEventCallback(int dx, int dy) {
          if (mSendViewScrolledAccessibilityEvent == null) {
              mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent();
          }
          mSendViewScrolledAccessibilityEvent.post(dx, dy);
      }
  
      /**
       * Called by a parent to request that a child update its values for mScrollX
       * and mScrollY if necessary. This will typically be done if the child is
       * animating a scroll using a {@link android.widget.Scroller Scroller}
       * object.
       */
      public void computeScroll() {
      }
  
      /**
       * <p>Indicate whether the horizontal edges are faded when the view is
       * scrolled horizontally.</p>
       *
       * @return true if the horizontal edges should are faded on scroll, false
       *         otherwise
       *
       * @see #setHorizontalFadingEdgeEnabled(boolean)
       *
       * @attr ref android.R.styleable#View_requiresFadingEdge
       */
      public boolean isHorizontalFadingEdgeEnabled() {
          return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL;
      }
  
      /**
       * <p>Define whether the horizontal edges should be faded when this view
       * is scrolled horizontally.</p>
       *
       * @param horizontalFadingEdgeEnabled true if the horizontal edges should
       *                                    be faded when the view is scrolled
       *                                    horizontally
       *
       * @see #isHorizontalFadingEdgeEnabled()
       *
       * @attr ref android.R.styleable#View_requiresFadingEdge
       */
      public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) {
          if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) {
              if (horizontalFadingEdgeEnabled) {
                  initScrollCache();
              }
  
              mViewFlags ^= FADING_EDGE_HORIZONTAL;
          }
      }
  
      /**
       * <p>Indicate whether the vertical edges are faded when the view is
       * scrolled horizontally.</p>
       *
       * @return true if the vertical edges should are faded on scroll, false
       *         otherwise
       *
       * @see #setVerticalFadingEdgeEnabled(boolean)
       *
       * @attr ref android.R.styleable#View_requiresFadingEdge
       */
      public boolean isVerticalFadingEdgeEnabled() {
          return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL;
      }
  
      /**
       * <p>Define whether the vertical edges should be faded when this view
       * is scrolled vertically.</p>
       *
       * @param verticalFadingEdgeEnabled true if the vertical edges should
       *                                  be faded when the view is scrolled
       *                                  vertically
       *
       * @see #isVerticalFadingEdgeEnabled()
       *
       * @attr ref android.R.styleable#View_requiresFadingEdge
       */
      public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) {
          if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) {
              if (verticalFadingEdgeEnabled) {
                  initScrollCache();
              }
  
              mViewFlags ^= FADING_EDGE_VERTICAL;
          }
      }
  
      /**
       * Get the fading edge flags, used for inspection.
       *
       * @return One of {@link #FADING_EDGE_NONE}, {@link #FADING_EDGE_VERTICAL},
       *         or {@link #FADING_EDGE_HORIZONTAL}
       * @hide
       */
      @InspectableProperty(name = "requiresFadingEdge", flagMapping = {
              @FlagEntry(target = FADING_EDGE_NONE, mask = FADING_EDGE_MASK, name = "none"),
              @FlagEntry(target = FADING_EDGE_VERTICAL, name = "vertical"),
              @FlagEntry(target = FADING_EDGE_HORIZONTAL, name = "horizontal")
      })
      public int getFadingEdge() {
          return mViewFlags & FADING_EDGE_MASK;
      }
  
      /**
       * Get the fading edge length, used for inspection
       *
       * @return The fading edge length or 0
       * @hide
       */
      @InspectableProperty
      public int getFadingEdgeLength() {
          if (mScrollCache != null && (mViewFlags & FADING_EDGE_MASK) != FADING_EDGE_NONE) {
              return mScrollCache.fadingEdgeLength;
          }
          return 0;
      }
  
      /**
       * Returns the strength, or intensity, of the top faded edge. The strength is
       * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
       * returns 0.0 or 1.0 but no value in between.
       *
       * Subclasses should override this method to provide a smoother fade transition
       * when scrolling occurs.
       *
       * @return the intensity of the top fade as a float between 0.0f and 1.0f
       */
      protected float getTopFadingEdgeStrength() {
          return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f;
      }
  
      /**
       * Returns the strength, or intensity, of the bottom faded edge. The strength is
       * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
       * returns 0.0 or 1.0 but no value in between.
       *
       * Subclasses should override this method to provide a smoother fade transition
       * when scrolling occurs.
       *
       * @return the intensity of the bottom fade as a float between 0.0f and 1.0f
       */
      protected float getBottomFadingEdgeStrength() {
          return computeVerticalScrollOffset() + computeVerticalScrollExtent() <
                  computeVerticalScrollRange() ? 1.0f : 0.0f;
      }
  
      /**
       * Returns the strength, or intensity, of the left faded edge. The strength is
       * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
       * returns 0.0 or 1.0 but no value in between.
       *
       * Subclasses should override this method to provide a smoother fade transition
       * when scrolling occurs.
       *
       * @return the intensity of the left fade as a float between 0.0f and 1.0f
       */
      protected float getLeftFadingEdgeStrength() {
          return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f;
      }
  
      /**
       * Returns the strength, or intensity, of the right faded edge. The strength is
       * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
       * returns 0.0 or 1.0 but no value in between.
       *
       * Subclasses should override this method to provide a smoother fade transition
       * when scrolling occurs.
       *
       * @return the intensity of the right fade as a float between 0.0f and 1.0f
       */
      protected float getRightFadingEdgeStrength() {
          return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() <
                  computeHorizontalScrollRange() ? 1.0f : 0.0f;
      }
  
      /**
       * <p>Indicate whether the horizontal scrollbar should be drawn or not. The
       * scrollbar is not drawn by default.</p>
       *
       * @return true if the horizontal scrollbar should be painted, false
       *         otherwise
       *
       * @see #setHorizontalScrollBarEnabled(boolean)
       */
      public boolean isHorizontalScrollBarEnabled() {
          return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL;
      }
  
      /**
       * <p>Define whether the horizontal scrollbar should be drawn or not. The
       * scrollbar is not drawn by default.</p>
       *
       * @param horizontalScrollBarEnabled true if the horizontal scrollbar should
       *                                   be painted
       *
       * @see #isHorizontalScrollBarEnabled()
       */
      public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) {
          if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) {
              mViewFlags ^= SCROLLBARS_HORIZONTAL;
              computeOpaqueFlags();
              resolvePadding();
          }
      }
  
      /**
       * <p>Indicate whether the vertical scrollbar should be drawn or not. The
       * scrollbar is not drawn by default.</p>
       *
       * @return true if the vertical scrollbar should be painted, false
       *         otherwise
       *
       * @see #setVerticalScrollBarEnabled(boolean)
       */
      public boolean isVerticalScrollBarEnabled() {
          return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL;
      }
  
      /**
       * <p>Define whether the vertical scrollbar should be drawn or not. The
       * scrollbar is not drawn by default.</p>
       *
       * @param verticalScrollBarEnabled true if the vertical scrollbar should
       *                                 be painted
       *
       * @see #isVerticalScrollBarEnabled()
       */
      public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) {
          if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) {
              mViewFlags ^= SCROLLBARS_VERTICAL;
              computeOpaqueFlags();
              resolvePadding();
          }
      }
  
      /**
       * @hide
       */
      @UnsupportedAppUsage
      protected void recomputePadding() {
          internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom);
      }
  
      /**
       * Define whether scrollbars will fade when the view is not scrolling.
       *
       * @param fadeScrollbars whether to enable fading
       *
       * @attr ref android.R.styleable#View_fadeScrollbars
       */
      public void setScrollbarFadingEnabled(boolean fadeScrollbars) {
          initScrollCache();
          final ScrollabilityCache scrollabilityCache = mScrollCache;
          scrollabilityCache.fadeScrollBars = fadeScrollbars;
          if (fadeScrollbars) {
              scrollabilityCache.state = ScrollabilityCache.OFF;
          } else {
              scrollabilityCache.state = ScrollabilityCache.ON;
          }
      }
  
      /**
       *
       * Returns true if scrollbars will fade when this view is not scrolling
       *
       * @return true if scrollbar fading is enabled
       *
       * @attr ref android.R.styleable#View_fadeScrollbars
       */
      public boolean isScrollbarFadingEnabled() {
          return mScrollCache != null && mScrollCache.fadeScrollBars;
      }
  
      /**
       *
       * Returns the delay before scrollbars fade.
       *
       * @return the delay before scrollbars fade
       *
       * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade
       */
      @InspectableProperty(name = "scrollbarDefaultDelayBeforeFade")
      public int getScrollBarDefaultDelayBeforeFade() {
          return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() :
                  mScrollCache.scrollBarDefaultDelayBeforeFade;
      }
  
      /**
       * Define the delay before scrollbars fade.
       *
       * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade
       *
       * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade
       */
      public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) {
          getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade;
      }
  
      /**
       *
       * Returns the scrollbar fade duration.
       *
       * @return the scrollbar fade duration, in milliseconds
       *
       * @attr ref android.R.styleable#View_scrollbarFadeDuration
       */
      @InspectableProperty(name = "scrollbarFadeDuration")
      public int getScrollBarFadeDuration() {
          return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() :
                  mScrollCache.scrollBarFadeDuration;
      }
  
      /**
       * Define the scrollbar fade duration.
       *
       * @param scrollBarFadeDuration - the scrollbar fade duration, in milliseconds
       *
       * @attr ref android.R.styleable#View_scrollbarFadeDuration
       */
      public void setScrollBarFadeDuration(int scrollBarFadeDuration) {
          getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration;
      }
  
      /**
       *
       * Returns the scrollbar size.
       *
       * @return the scrollbar size
       *
       * @attr ref android.R.styleable#View_scrollbarSize
       */
      @InspectableProperty(name = "scrollbarSize")
      public int getScrollBarSize() {
          return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() :
                  mScrollCache.scrollBarSize;
      }
  
      /**
       * Define the scrollbar size.
       *
       * @param scrollBarSize - the scrollbar size
       *
       * @attr ref android.R.styleable#View_scrollbarSize
       */
      public void setScrollBarSize(int scrollBarSize) {
          getScrollCache().scrollBarSize = scrollBarSize;
      }
  
      /**
       * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or
       * inset. When inset, they add to the padding of the view. And the scrollbars
       * can be drawn inside the padding area or on the edge of the view. For example,
       * if a view has a background drawable and you want to draw the scrollbars
       * inside the padding specified by the drawable, you can use
       * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to
       * appear at the edge of the view, ignoring the padding, then you can use
       * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p>
       * @param style the style of the scrollbars. Should be one of
       * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET,
       * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.
       * @see #SCROLLBARS_INSIDE_OVERLAY
       * @see #SCROLLBARS_INSIDE_INSET
       * @see #SCROLLBARS_OUTSIDE_OVERLAY
       * @see #SCROLLBARS_OUTSIDE_INSET
       *
       * @attr ref android.R.styleable#View_scrollbarStyle
       */
      public void setScrollBarStyle(@ScrollBarStyle int style) {
          if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) {
              mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK);
              computeOpaqueFlags();
              resolvePadding();
          }
      }
  
      /**
       * <p>Returns the current scrollbar style.</p>
       * @return the current scrollbar style
       * @see #SCROLLBARS_INSIDE_OVERLAY
       * @see #SCROLLBARS_INSIDE_INSET
       * @see #SCROLLBARS_OUTSIDE_OVERLAY
       * @see #SCROLLBARS_OUTSIDE_INSET
       *
       * @attr ref android.R.styleable#View_scrollbarStyle
       */
      @ViewDebug.ExportedProperty(mapping = {
              @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"),
              @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"),
              @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"),
              @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET")
      })
      @InspectableProperty(name = "scrollbarStyle", enumMapping = {
              @EnumEntry(value = SCROLLBARS_INSIDE_OVERLAY, name = "insideOverlay"),
              @EnumEntry(value = SCROLLBARS_INSIDE_INSET, name = "insideInset"),
              @EnumEntry(value = SCROLLBARS_OUTSIDE_OVERLAY, name = "outsideOverlay"),
              @EnumEntry(value = SCROLLBARS_OUTSIDE_INSET, name = "outsideInset")
      })
      @ScrollBarStyle
      public int getScrollBarStyle() {
          return mViewFlags & SCROLLBARS_STYLE_MASK;
      }
  
      /**
       * <p>Compute the horizontal range that the horizontal scrollbar
       * represents.</p>
       *
       * <p>The range is expressed in arbitrary units that must be the same as the
       * units used by {@link #computeHorizontalScrollExtent()} and
       * {@link #computeHorizontalScrollOffset()}.</p>
       *
       * <p>The default range is the drawing width of this view.</p>
       *
       * @return the total horizontal range represented by the horizontal
       *         scrollbar
       *
       * @see #computeHorizontalScrollExtent()
       * @see #computeHorizontalScrollOffset()
       */
      protected int computeHorizontalScrollRange() {
          return getWidth();
      }
  
      /**
       * <p>Compute the horizontal offset of the horizontal scrollbar's thumb
       * within the horizontal range. This value is used to compute the position
       * of the thumb within the scrollbar's track.</p>
       *
       * <p>The range is expressed in arbitrary units that must be the same as the
       * units used by {@link #computeHorizontalScrollRange()} and
       * {@link #computeHorizontalScrollExtent()}.</p>
       *
       * <p>The default offset is the scroll offset of this view.</p>
       *
       * @return the horizontal offset of the scrollbar's thumb
       *
       * @see #computeHorizontalScrollRange()
       * @see #computeHorizontalScrollExtent()
       */
      protected int computeHorizontalScrollOffset() {
          return mScrollX;
      }
  
      /**
       * <p>Compute the horizontal extent of the horizontal scrollbar's thumb
       * within the horizontal range. This value is used to compute the length
       * of the thumb within the scrollbar's track.</p>
       *
       * <p>The range is expressed in arbitrary units that must be the same as the
       * units used by {@link #computeHorizontalScrollRange()} and
       * {@link #computeHorizontalScrollOffset()}.</p>
       *
       * <p>The default extent is the drawing width of this view.</p>
       *
       * @return the horizontal extent of the scrollbar's thumb
       *
       * @see #computeHorizontalScrollRange()
       * @see #computeHorizontalScrollOffset()
       */
      protected int computeHorizontalScrollExtent() {
          return getWidth();
      }
  
      /**
       * <p>Compute the vertical range that the vertical scrollbar represents.</p>
       *
       * <p>The range is expressed in arbitrary units that must be the same as the
       * units used by {@link #computeVerticalScrollExtent()} and
       * {@link #computeVerticalScrollOffset()}.</p>
       *
       * @return the total vertical range represented by the vertical scrollbar
       *
       * <p>The default range is the drawing height of this view.</p>
       *
       * @see #computeVerticalScrollExtent()
       * @see #computeVerticalScrollOffset()
       */
      protected int computeVerticalScrollRange() {
          return getHeight();
      }
  
      /**
       * <p>Compute the vertical offset of the vertical scrollbar's thumb
       * within the horizontal range. This value is used to compute the position
       * of the thumb within the scrollbar's track.</p>
       *
       * <p>The range is expressed in arbitrary units that must be the same as the
       * units used by {@link #computeVerticalScrollRange()} and
       * {@link #computeVerticalScrollExtent()}.</p>
       *
       * <p>The default offset is the scroll offset of this view.</p>
       *
       * @return the vertical offset of the scrollbar's thumb
       *
       * @see #computeVerticalScrollRange()
       * @see #computeVerticalScrollExtent()
       */
      protected int computeVerticalScrollOffset() {
          return mScrollY;
      }
  
      /**
       * <p>Compute the vertical extent of the vertical scrollbar's thumb
       * within the vertical range. This value is used to compute the length
       * of the thumb within the scrollbar's track.</p>
       *
       * <p>The range is expressed in arbitrary units that must be the same as the
       * units used by {@link #computeVerticalScrollRange()} and
       * {@link #computeVerticalScrollOffset()}.</p>
       *
       * <p>The default extent is the drawing height of this view.</p>
       *
       * @return the vertical extent of the scrollbar's thumb
       *
       * @see #computeVerticalScrollRange()
       * @see #computeVerticalScrollOffset()
       */
      protected int computeVerticalScrollExtent() {
          return getHeight();
      }
  
      /**
       * Check if this view can be scrolled horizontally in a certain direction.
       *
       * @param direction Negative to check scrolling left, positive to check scrolling right.
       * @return true if this view can be scrolled in the specified direction, false otherwise.
       */
      public boolean canScrollHorizontally(int direction) {
          final int offset = computeHorizontalScrollOffset();
          final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent();
          if (range == 0) return false;
          if (direction < 0) {
              return offset > 0;
          } else {
              return offset < range - 1;
          }
      }
  
      /**
       * Check if this view can be scrolled vertically in a certain direction.
       *
       * @param direction Negative to check scrolling up, positive to check scrolling down.
       * @return true if this view can be scrolled in the specified direction, false otherwise.
       */
      public boolean canScrollVertically(int direction) {
          final int offset = computeVerticalScrollOffset();
          final int range = computeVerticalScrollRange() - computeVerticalScrollExtent();
          if (range == 0) return false;
          if (direction < 0) {
              return offset > 0;
          } else {
              return offset < range - 1;
          }
      }
  
      void getScrollIndicatorBounds(@NonNull Rect out) {
          out.left = mScrollX;
          out.right = mScrollX + mRight - mLeft;
          out.top = mScrollY;
          out.bottom = mScrollY + mBottom - mTop;
      }
  
      private void onDrawScrollIndicators(Canvas c) {
          if ((mPrivateFlags3 & SCROLL_INDICATORS_PFLAG3_MASK) == 0) {
              // No scroll indicators enabled.
              return;
          }
  
          final Drawable dr = mScrollIndicatorDrawable;
          if (dr == null) {
              // Scroll indicators aren't supported here.
              return;
          }
  
          final int h = dr.getIntrinsicHeight();
          final int w = dr.getIntrinsicWidth();
          final Rect rect = mAttachInfo.mTmpInvalRect;
          getScrollIndicatorBounds(rect);
  
          if ((mPrivateFlags3 & PFLAG3_SCROLL_INDICATOR_TOP) != 0) {
              final boolean canScrollUp = canScrollVertically(-1);
              if (canScrollUp) {
                  dr.setBounds(rect.left, rect.top, rect.right, rect.top + h);
                  dr.draw(c);
              }
          }
  
          if ((mPrivateFlags3 & PFLAG3_SCROLL_INDICATOR_BOTTOM) != 0) {
              final boolean canScrollDown = canScrollVertically(1);
              if (canScrollDown) {
                  dr.setBounds(rect.left, rect.bottom - h, rect.right, rect.bottom);
                  dr.draw(c);
              }
          }
  
          final int leftRtl;
          final int rightRtl;
          if (getLayoutDirection() == LAYOUT_DIRECTION_RTL) {
              leftRtl = PFLAG3_SCROLL_INDICATOR_END;
              rightRtl = PFLAG3_SCROLL_INDICATOR_START;
          } else {
              leftRtl = PFLAG3_SCROLL_INDICATOR_START;
              rightRtl = PFLAG3_SCROLL_INDICATOR_END;
          }
  
          final int leftMask = PFLAG3_SCROLL_INDICATOR_LEFT | leftRtl;
          if ((mPrivateFlags3 & leftMask) != 0) {
              final boolean canScrollLeft = canScrollHorizontally(-1);
              if (canScrollLeft) {
                  dr.setBounds(rect.left, rect.top, rect.left + w, rect.bottom);
                  dr.draw(c);
              }
          }
  
          final int rightMask = PFLAG3_SCROLL_INDICATOR_RIGHT | rightRtl;
          if ((mPrivateFlags3 & rightMask) != 0) {
              final boolean canScrollRight = canScrollHorizontally(1);
              if (canScrollRight) {
                  dr.setBounds(rect.right - w, rect.top, rect.right, rect.bottom);
                  dr.draw(c);
              }
          }
      }
  
      private void getHorizontalScrollBarBounds(@Nullable Rect drawBounds,
              @Nullable Rect touchBounds) {
          final Rect bounds = drawBounds != null ? drawBounds : touchBounds;
          if (bounds == null) {
              return;
          }
          final int inside = (mViewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0;
          final boolean drawVerticalScrollBar = isVerticalScrollBarEnabled()
                  && !isVerticalScrollBarHidden();
          final int size = getHorizontalScrollbarHeight();
          final int verticalScrollBarGap = drawVerticalScrollBar ?
                  getVerticalScrollbarWidth() : 0;
          final int width = mRight - mLeft;
          final int height = mBottom - mTop;
          bounds.top = mScrollY + height - size - (mUserPaddingBottom & inside);
          bounds.left = mScrollX + (mPaddingLeft & inside);
          bounds.right = mScrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap;
          bounds.bottom = bounds.top + size;
  
          if (touchBounds == null) {
              return;
          }
          if (touchBounds != bounds) {
              touchBounds.set(bounds);
          }
          final int minTouchTarget = mScrollCache.scrollBarMinTouchTarget;
          if (touchBounds.height() < minTouchTarget) {
              final int adjust = (minTouchTarget - touchBounds.height()) / 2;
              touchBounds.bottom = Math.min(touchBounds.bottom + adjust, mScrollY + height);
              touchBounds.top = touchBounds.bottom - minTouchTarget;
          }
          if (touchBounds.width() < minTouchTarget) {
              final int adjust = (minTouchTarget - touchBounds.width()) / 2;
              touchBounds.left -= adjust;
              touchBounds.right = touchBounds.left + minTouchTarget;
          }
      }
  
      private void getVerticalScrollBarBounds(@Nullable Rect bounds, @Nullable Rect touchBounds) {
          if (mRoundScrollbarRenderer == null) {
              getStraightVerticalScrollBarBounds(bounds, touchBounds);
          } else {
              getRoundVerticalScrollBarBounds(bounds != null ? bounds : touchBounds);
          }
      }
  
      private void getRoundVerticalScrollBarBounds(Rect bounds) {
          final int width = mRight - mLeft;
          final int height = mBottom - mTop;
          // Do not take padding into account as we always want the scrollbars
          // to hug the screen for round wearable devices.
          bounds.left = mScrollX;
          bounds.top = mScrollY;
          bounds.right = bounds.left + width;
          bounds.bottom = mScrollY + height;
      }
  
      private void getStraightVerticalScrollBarBounds(@Nullable Rect drawBounds,
              @Nullable Rect touchBounds) {
          final Rect bounds = drawBounds != null ? drawBounds : touchBounds;
          if (bounds == null) {
              return;
          }
          final int inside = (mViewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0;
          final int size = getVerticalScrollbarWidth();
          int verticalScrollbarPosition = mVerticalScrollbarPosition;
          if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) {
              verticalScrollbarPosition = isLayoutRtl() ?
                      SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT;
          }
          final int width = mRight - mLeft;
          final int height = mBottom - mTop;
          switch (verticalScrollbarPosition) {
              default:
              case SCROLLBAR_POSITION_RIGHT:
                  bounds.left = mScrollX + width - size - (mUserPaddingRight & inside);
                  break;
              case SCROLLBAR_POSITION_LEFT:
                  bounds.left = mScrollX + (mUserPaddingLeft & inside);
                  break;
          }
          bounds.top = mScrollY + (mPaddingTop & inside);
          bounds.right = bounds.left + size;
          bounds.bottom = mScrollY + height - (mUserPaddingBottom & inside);
  
          if (touchBounds == null) {
              return;
          }
          if (touchBounds != bounds) {
              touchBounds.set(bounds);
          }
          final int minTouchTarget = mScrollCache.scrollBarMinTouchTarget;
          if (touchBounds.width() < minTouchTarget) {
              final int adjust = (minTouchTarget - touchBounds.width()) / 2;
              if (verticalScrollbarPosition == SCROLLBAR_POSITION_RIGHT) {
                  touchBounds.right = Math.min(touchBounds.right + adjust, mScrollX + width);
                  touchBounds.left = touchBounds.right - minTouchTarget;
              } else {
                  touchBounds.left = Math.max(touchBounds.left + adjust, mScrollX);
                  touchBounds.right = touchBounds.left + minTouchTarget;
              }
          }
          if (touchBounds.height() < minTouchTarget) {
              final int adjust = (minTouchTarget - touchBounds.height()) / 2;
              touchBounds.top -= adjust;
              touchBounds.bottom = touchBounds.top + minTouchTarget;
          }
      }
  
      /**
       * <p>Request the drawing of the horizontal and the vertical scrollbar. The
       * scrollbars are painted only if they have been awakened first.</p>
       *
       * @param canvas the canvas on which to draw the scrollbars
       *
       * @see #awakenScrollBars(int)
       */
      protected final void onDrawScrollBars(Canvas canvas) {
          // scrollbars are drawn only when the animation is running
          final ScrollabilityCache cache = mScrollCache;
  
          if (cache != null) {
  
              int state = cache.state;
  
              if (state == ScrollabilityCache.OFF) {
                  return;
              }
  
              boolean invalidate = false;
  
              if (state == ScrollabilityCache.FADING) {
                  // We're fading -- get our fade interpolation
                  if (cache.interpolatorValues == null) {
                      cache.interpolatorValues = new float[1];
                  }
  
                  float[] values = cache.interpolatorValues;
  
                  // Stops the animation if we're done
                  if (cache.scrollBarInterpolator.timeToValues(values) ==
                          Interpolator.Result.FREEZE_END) {
                      cache.state = ScrollabilityCache.OFF;
                  } else {
                      cache.scrollBar.mutate().setAlpha(Math.round(values[0]));
                  }
  
                  // This will make the scroll bars inval themselves after
                  // drawing. We only want this when we're fading so that
                  // we prevent excessive redraws
                  invalidate = true;
              } else {
                  // We're just on -- but we may have been fading before so
                  // reset alpha
                  cache.scrollBar.mutate().setAlpha(255);
              }
  
              final boolean drawHorizontalScrollBar = isHorizontalScrollBarEnabled();
              final boolean drawVerticalScrollBar = isVerticalScrollBarEnabled()
                      && !isVerticalScrollBarHidden();
  
              // Fork out the scroll bar drawing for round wearable devices.
              if (mRoundScrollbarRenderer != null) {
                  if (drawVerticalScrollBar) {
                      final Rect bounds = cache.mScrollBarBounds;
                      getVerticalScrollBarBounds(bounds, null);
                      mRoundScrollbarRenderer.drawRoundScrollbars(
                              canvas, (float) cache.scrollBar.getAlpha() / 255f, bounds);
                      if (invalidate) {
                          invalidate();
                      }
                  }
                  // Do not draw horizontal scroll bars for round wearable devices.
              } else if (drawVerticalScrollBar || drawHorizontalScrollBar) {
                  final ScrollBarDrawable scrollBar = cache.scrollBar;
  
                  if (drawHorizontalScrollBar) {
                      scrollBar.setParameters(computeHorizontalScrollRange(),
                              computeHorizontalScrollOffset(),
                              computeHorizontalScrollExtent(), false);
                      final Rect bounds = cache.mScrollBarBounds;
                      getHorizontalScrollBarBounds(bounds, null);
                      onDrawHorizontalScrollBar(canvas, scrollBar, bounds.left, bounds.top,
                              bounds.right, bounds.bottom);
                      if (invalidate) {
                          invalidate(bounds);
                      }
                  }
  
                  if (drawVerticalScrollBar) {
                      scrollBar.setParameters(computeVerticalScrollRange(),
                              computeVerticalScrollOffset(),
                              computeVerticalScrollExtent(), true);
                      final Rect bounds = cache.mScrollBarBounds;
                      getVerticalScrollBarBounds(bounds, null);
                      onDrawVerticalScrollBar(canvas, scrollBar, bounds.left, bounds.top,
                              bounds.right, bounds.bottom);
                      if (invalidate) {
                          invalidate(bounds);
                      }
                  }
              }
          }
      }
  
      /**
       * Override this if the vertical scrollbar needs to be hidden in a subclass, like when
       * FastScroller is visible.
       * @return whether to temporarily hide the vertical scrollbar
       * @hide
       */
      protected boolean isVerticalScrollBarHidden() {
          return false;
      }
  
      /**
       * <p>Draw the horizontal scrollbar if
       * {@link #isHorizontalScrollBarEnabled()} returns true.</p>
       *
       * @param canvas the canvas on which to draw the scrollbar
       * @param scrollBar the scrollbar's drawable
       *
       * @see #isHorizontalScrollBarEnabled()
       * @see #computeHorizontalScrollRange()
       * @see #computeHorizontalScrollExtent()
       * @see #computeHorizontalScrollOffset()
       * @hide
       */
      @UnsupportedAppUsage
      protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar,
              int l, int t, int r, int b) {
          scrollBar.setBounds(l, t, r, b);
          scrollBar.draw(canvas);
      }
  
      /**
       * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()}
       * returns true.</p>
       *
       * @param canvas the canvas on which to draw the scrollbar
       * @param scrollBar the scrollbar's drawable
       *
       * @see #isVerticalScrollBarEnabled()
       * @see #computeVerticalScrollRange()
       * @see #computeVerticalScrollExtent()
       * @see #computeVerticalScrollOffset()
       * @hide
       */
      @UnsupportedAppUsage
      protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar,
              int l, int t, int r, int b) {
          scrollBar.setBounds(l, t, r, b);
          scrollBar.draw(canvas);
      }
  
      /**
       * Implement this to do your drawing.
       *
       * @param canvas the canvas on which the background will be drawn
       */
      protected void onDraw(Canvas canvas) {
      }
  
      /*
       * Caller is responsible for calling requestLayout if necessary.
       * (This allows addViewInLayout to not request a new layout.)
       */
      @UnsupportedAppUsage
      void assignParent(ViewParent parent) {
          if (mParent == null) {
              mParent = parent;
          } else if (parent == null) {
              mParent = null;
          } else {
              throw new RuntimeException("view " + this + " being added, but"
                      + " it already has a parent");
          }
      }
  
      /**
       * This is called when the view is attached to a window.  At this point it
       * has a Surface and will start drawing.  Note that this function is
       * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)},
       * however it may be called any time before the first onDraw -- including
       * before or after {@link #onMeasure(int, int)}.
       *
       * @see #onDetachedFromWindow()
       */
      @CallSuper
      protected void onAttachedToWindow() {
          if ((mPrivateFlags & PFLAG_REQUEST_TRANSPARENT_REGIONS) != 0) {
              mParent.requestTransparentRegion(this);
          }
  
          mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT;
  
          jumpDrawablesToCurrentState();
  
          AccessibilityNodeIdManager.getInstance().registerViewWithId(this, getAccessibilityViewId());
          resetSubtreeAccessibilityStateChanged();
  
          // rebuild, since Outline not maintained while View is detached
          rebuildOutline();
  
          if (isFocused()) {
              notifyFocusChangeToInputMethodManager(true /* hasFocus */);
          }
      }
  
      /**
       * Resolve all RTL related properties.
       *
       * @return true if resolution of RTL properties has been done
       *
       * @hide
       */
      public boolean resolveRtlPropertiesIfNeeded() {
          if (!needRtlPropertiesResolution()) return false;
  
          // Order is important here: LayoutDirection MUST be resolved first
          if (!isLayoutDirectionResolved()) {
              resolveLayoutDirection();
              resolveLayoutParams();
          }
          // ... then we can resolve the others properties depending on the resolved LayoutDirection.
          if (!isTextDirectionResolved()) {
              resolveTextDirection();
          }
          if (!isTextAlignmentResolved()) {
              resolveTextAlignment();
          }
          // Should resolve Drawables before Padding because we need the layout direction of the
          // Drawable to correctly resolve Padding.
          if (!areDrawablesResolved()) {
              resolveDrawables();
          }
          if (!isPaddingResolved()) {
              resolvePadding();
          }
          onRtlPropertiesChanged(getLayoutDirection());
          return true;
      }
  
      /**
       * Reset resolution of all RTL related properties.
       *
       * @hide
       */
      @TestApi
      public void resetRtlProperties() {
          resetResolvedLayoutDirection();
          resetResolvedTextDirection();
          resetResolvedTextAlignment();
          resetResolvedPadding();
          resetResolvedDrawables();
      }
  
      /**
       * @see #onScreenStateChanged(int)
       */
      void dispatchScreenStateChanged(int screenState) {
          onScreenStateChanged(screenState);
      }
  
      /**
       * This method is called whenever the state of the screen this view is
       * attached to changes. A state change will usually occurs when the screen
       * turns on or off (whether it happens automatically or the user does it
       * manually.)
       *
       * @param screenState The new state of the screen. Can be either
       *                    {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF}
       */
      public void onScreenStateChanged(int screenState) {
      }
  
      /**
       * @see #onMovedToDisplay(int, Configuration)
       */
      void dispatchMovedToDisplay(Display display, Configuration config) {
          mAttachInfo.mDisplay = display;
          mAttachInfo.mDisplayState = display.getState();
          onMovedToDisplay(display.getDisplayId(), config);
      }
  
      /**
       * Called by the system when the hosting activity is moved from one display to another without
       * recreation. This means that the activity is declared to handle all changes to configuration
       * that happened when it was switched to another display, so it wasn't destroyed and created
       * again.
       *
       * <p>This call will be followed by {@link #onConfigurationChanged(Configuration)} if the
       * applied configuration actually changed. It is up to app developer to choose whether to handle
       * the change in this method or in the following {@link #onConfigurationChanged(Configuration)}
       * call.
       *
       * <p>Use this callback to track changes to the displays if some functionality relies on an
       * association with some display properties.
       *
       * @param displayId The id of the display to which the view was moved.
       * @param config Configuration of the resources on new display after move.
       *
       * @see #onConfigurationChanged(Configuration)
       * @hide
       */
      public void onMovedToDisplay(int displayId, Configuration config) {
      }
  
      /**
       * Return true if the application tag in the AndroidManifest has set "supportRtl" to true
       */
      @UnsupportedAppUsage
      private boolean hasRtlSupport() {
          return mContext.getApplicationInfo().hasRtlSupport();
      }
  
      /**
       * Return true if we are in RTL compatibility mode (either before Jelly Bean MR1 or
       * RTL not supported)
       */
      private boolean isRtlCompatibilityMode() {
          final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion;
          return targetSdkVersion < Build.VERSION_CODES.JELLY_BEAN_MR1 || !hasRtlSupport();
      }
  
      /**
       * @return true if RTL properties need resolution.
       *
       */
      private boolean needRtlPropertiesResolution() {
          return (mPrivateFlags2 & ALL_RTL_PROPERTIES_RESOLVED) != ALL_RTL_PROPERTIES_RESOLVED;
      }
  
      /**
       * Called when any RTL property (layout direction or text direction or text alignment) has
       * been changed.
       *
       * Subclasses need to override this method to take care of cached information that depends on the
       * resolved layout direction, or to inform child views that inherit their layout direction.
       *
       * The default implementation does nothing.
       *
       * @param layoutDirection the direction of the layout
       *
       * @see #LAYOUT_DIRECTION_LTR
       * @see #LAYOUT_DIRECTION_RTL
       */
      public void onRtlPropertiesChanged(@ResolvedLayoutDir int layoutDirection) {
      }
  
      /**
       * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing
       * that the parent directionality can and will be resolved before its children.
       *
       * @return true if resolution has been done, false otherwise.
       *
       * @hide
       */
      public boolean resolveLayoutDirection() {
          // Clear any previous layout direction resolution
          mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK;
  
          if (hasRtlSupport()) {
              // Set resolved depending on layout direction
              switch ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >>
                      PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) {
                  case LAYOUT_DIRECTION_INHERIT:
                      // We cannot resolve yet. LTR is by default and let the resolution happen again
                      // later to get the correct resolved value
                      if (!canResolveLayoutDirection()) return false;
  
                      // Parent has not yet resolved, LTR is still the default
                      try {
                          if (!mParent.isLayoutDirectionResolved()) return false;
  
                          if (mParent.getLayoutDirection() == LAYOUT_DIRECTION_RTL) {
                              mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL;
                          }
                      } catch (AbstractMethodError e) {
                          Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
                                  " does not fully implement ViewParent", e);
                      }
                      break;
                  case LAYOUT_DIRECTION_RTL:
                      mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL;
                      break;
                  case LAYOUT_DIRECTION_LOCALE:
                      if((LAYOUT_DIRECTION_RTL ==
                              TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))) {
                          mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL;
                      }
                      break;
                  default:
                      // Nothing to do, LTR by default
              }
          }
  
          // Set to resolved
          mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED;
          return true;
      }
  
      /**
       * Check if layout direction resolution can be done.
       *
       * @return true if layout direction resolution can be done otherwise return false.
       */
      public boolean canResolveLayoutDirection() {
          switch (getRawLayoutDirection()) {
              case LAYOUT_DIRECTION_INHERIT:
                  if (mParent != null) {
                      try {
                          return mParent.canResolveLayoutDirection();
                      } catch (AbstractMethodError e) {
                          Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
                                  " does not fully implement ViewParent", e);
                      }
                  }
                  return false;
  
              default:
                  return true;
          }
      }
  
      /**
       * Reset the resolved layout direction. Layout direction will be resolved during a call to
       * {@link #onMeasure(int, int)}.
       *
       * @hide
       */
      @TestApi
      public void resetResolvedLayoutDirection() {
          // Reset the current resolved bits
          mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK;
      }
  
      /**
       * @return true if the layout direction is inherited.
       *
       * @hide
       */
      public boolean isLayoutDirectionInherited() {
          return (getRawLayoutDirection() == LAYOUT_DIRECTION_INHERIT);
      }
  
      /**
       * @return true if layout direction has been resolved.
       */
      public boolean isLayoutDirectionResolved() {
          return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED) == PFLAG2_LAYOUT_DIRECTION_RESOLVED;
      }
  
      /**
       * Return if padding has been resolved
       *
       * @hide
       */
      @UnsupportedAppUsage
      boolean isPaddingResolved() {
          return (mPrivateFlags2 & PFLAG2_PADDING_RESOLVED) == PFLAG2_PADDING_RESOLVED;
      }
  
      /**
       * Resolves padding depending on layout direction, if applicable, and
       * recomputes internal padding values to adjust for scroll bars.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public void resolvePadding() {
          final int resolvedLayoutDirection = getLayoutDirection();
  
          if (!isRtlCompatibilityMode()) {
              // Post Jelly Bean MR1 case: we need to take the resolved layout direction into account.
              // If start / end padding are defined, they will be resolved (hence overriding) to
              // left / right or right / left depending on the resolved layout direction.
              // If start / end padding are not defined, use the left / right ones.
              if (mBackground != null && (!mLeftPaddingDefined || !mRightPaddingDefined)) {
                  Rect padding = sThreadLocal.get();
                  if (padding == null) {
                      padding = new Rect();
                      sThreadLocal.set(padding);
                  }
                  mBackground.getPadding(padding);
                  if (!mLeftPaddingDefined) {
                      mUserPaddingLeftInitial = padding.left;
                  }
                  if (!mRightPaddingDefined) {
                      mUserPaddingRightInitial = padding.right;
                  }
              }
              switch (resolvedLayoutDirection) {
                  case LAYOUT_DIRECTION_RTL:
                      if (mUserPaddingStart != UNDEFINED_PADDING) {
                          mUserPaddingRight = mUserPaddingStart;
                      } else {
                          mUserPaddingRight = mUserPaddingRightInitial;
                      }
                      if (mUserPaddingEnd != UNDEFINED_PADDING) {
                          mUserPaddingLeft = mUserPaddingEnd;
                      } else {
                          mUserPaddingLeft = mUserPaddingLeftInitial;
                      }
                      break;
                  case LAYOUT_DIRECTION_LTR:
                  default:
                      if (mUserPaddingStart != UNDEFINED_PADDING) {
                          mUserPaddingLeft = mUserPaddingStart;
                      } else {
                          mUserPaddingLeft = mUserPaddingLeftInitial;
                      }
                      if (mUserPaddingEnd != UNDEFINED_PADDING) {
                          mUserPaddingRight = mUserPaddingEnd;
                      } else {
                          mUserPaddingRight = mUserPaddingRightInitial;
                      }
              }
  
              mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom;
          }
  
          internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom);
          onRtlPropertiesChanged(resolvedLayoutDirection);
  
          mPrivateFlags2 |= PFLAG2_PADDING_RESOLVED;
      }
  
      /**
       * Reset the resolved layout direction.
       *
       * @hide
       */
      @TestApi
      public void resetResolvedPadding() {
          resetResolvedPaddingInternal();
      }
  
      /**
       * Used when we only want to reset *this* view's padding and not trigger overrides
       * in ViewGroup that reset children too.
       */
      void resetResolvedPaddingInternal() {
          mPrivateFlags2 &= ~PFLAG2_PADDING_RESOLVED;
      }
  
      /**
       * This is called when the view is detached from a window.  At this point it
       * no longer has a surface for drawing.
       *
       * @see #onAttachedToWindow()
       */
      @CallSuper
      protected void onDetachedFromWindow() {
      }
  
      /**
       * This is a framework-internal mirror of onDetachedFromWindow() that's called
       * after onDetachedFromWindow().
       *
       * If you override this you *MUST* call super.onDetachedFromWindowInternal()!
       * The super method should be called at the end of the overridden method to ensure
       * subclasses are destroyed first
       *
       * @hide
       */
      @CallSuper
      @UnsupportedAppUsage
      protected void onDetachedFromWindowInternal() {
          mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT;
          mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT;
          mPrivateFlags3 &= ~PFLAG3_TEMPORARY_DETACH;
  
          removeUnsetPressCallback();
          removeLongPressCallback();
          removePerformClickCallback();
          cancel(mSendViewScrolledAccessibilityEvent);
          stopNestedScroll();
  
          // Anything that started animating right before detach should already
          // be in its final state when re-attached.
          jumpDrawablesToCurrentState();
  
          destroyDrawingCache();
  
          cleanupDraw();
          mCurrentAnimation = null;
  
          if ((mViewFlags & TOOLTIP) == TOOLTIP) {
              hideTooltip();
          }
  
          AccessibilityNodeIdManager.getInstance().unregisterViewWithId(getAccessibilityViewId());
      }
  
      private void cleanupDraw() {
          resetDisplayList();
          if (mAttachInfo != null) {
              mAttachInfo.mViewRootImpl.cancelInvalidate(this);
          }
      }
  
      void invalidateInheritedLayoutMode(int layoutModeOfRoot) {
      }
  
      /**
       * @return The number of times this view has been attached to a window
       */
      protected int getWindowAttachCount() {
          return mWindowAttachCount;
      }
  
      /**
       * Retrieve a unique token identifying the window this view is attached to.
       * @return Return the window's token for use in
       * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}.
       */
      public IBinder getWindowToken() {
          return mAttachInfo != null ? mAttachInfo.mWindowToken : null;
      }
  
      /**
       * Retrieve the {@link WindowId} for the window this view is
       * currently attached to.
       */
      public WindowId getWindowId() {
          AttachInfo ai = mAttachInfo;
          if (ai == null) {
              return null;
          }
          if (ai.mWindowId == null) {
              try {
                  ai.mIWindowId = ai.mSession.getWindowId(ai.mWindowToken);
                  if (ai.mIWindowId != null) {
                      ai.mWindowId = new WindowId(ai.mIWindowId);
                  }
              } catch (RemoteException e) {
              }
          }
          return ai.mWindowId;
      }
  
      /**
       * Retrieve a unique token identifying the top-level "real" window of
       * the window that this view is attached to.  That is, this is like
       * {@link #getWindowToken}, except if the window this view in is a panel
       * window (attached to another containing window), then the token of
       * the containing window is returned instead.
       *
       * @return Returns the associated window token, either
       * {@link #getWindowToken()} or the containing window's token.
       */
      public IBinder getApplicationWindowToken() {
          AttachInfo ai = mAttachInfo;
          if (ai != null) {
              IBinder appWindowToken = ai.mPanelParentWindowToken;
              if (appWindowToken == null) {
                  appWindowToken = ai.mWindowToken;
              }
              return appWindowToken;
          }
          return null;
      }
  
      /**
       * Gets the logical display to which the view's window has been attached.
       *
       * @return The logical display, or null if the view is not currently attached to a window.
       */
      public Display getDisplay() {
          return mAttachInfo != null ? mAttachInfo.mDisplay : null;
      }
  
      /**
       * Retrieve private session object this view hierarchy is using to
       * communicate with the window manager.
       * @return the session object to communicate with the window manager
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
      /*package*/ IWindowSession getWindowSession() {
          return mAttachInfo != null ? mAttachInfo.mSession : null;
      }
  
      /**
       * Return the window this view is currently attached to. Used in
       * {@link android.app.ActivityView} to communicate with WM.
       * @hide
       */
      protected IWindow getWindow() {
          return mAttachInfo != null ? mAttachInfo.mWindow : null;
      }
  
      /**
       * Return the visibility value of the least visible component passed.
       */
      int combineVisibility(int vis1, int vis2) {
          // This works because VISIBLE < INVISIBLE < GONE.
          return Math.max(vis1, vis2);
      }
  
      /**
       * @param info the {@link android.view.View.AttachInfo} to associated with
       *        this view
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
      void dispatchAttachedToWindow(AttachInfo info, int visibility) {
          mAttachInfo = info;
          if (mOverlay != null) {
              mOverlay.getOverlayView().dispatchAttachedToWindow(info, visibility);
          }
          mWindowAttachCount++;
          // We will need to evaluate the drawable state at least once.
          mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY;
          if (mFloatingTreeObserver != null) {
              info.mTreeObserver.merge(mFloatingTreeObserver);
              mFloatingTreeObserver = null;
          }
  
          registerPendingFrameMetricsObservers();
  
          if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER) != 0) {
              mAttachInfo.mScrollContainers.add(this);
              mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED;
          }
          // Transfer all pending runnables.
          if (mRunQueue != null) {
              mRunQueue.executeActions(info.mHandler);
              mRunQueue = null;
          }
          performCollectViewAttributes(mAttachInfo, visibility);
          onAttachedToWindow();
  
          ListenerInfo li = mListenerInfo;
          final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners =
                  li != null ? li.mOnAttachStateChangeListeners : null;
          if (listeners != null && listeners.size() > 0) {
              // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to
              // perform the dispatching. The iterator is a safe guard against listeners that
              // could mutate the list by calling the various add/remove methods. This prevents
              // the array from being modified while we iterate it.
              for (OnAttachStateChangeListener listener : listeners) {
                  listener.onViewAttachedToWindow(this);
              }
          }
  
          int vis = info.mWindowVisibility;
          if (vis != GONE) {
              onWindowVisibilityChanged(vis);
              if (isShown()) {
                  // Calling onVisibilityAggregated directly here since the subtree will also
                  // receive dispatchAttachedToWindow and this same call
                  onVisibilityAggregated(vis == VISIBLE);
              }
          }
  
          // Send onVisibilityChanged directly instead of dispatchVisibilityChanged.
          // As all views in the subtree will already receive dispatchAttachedToWindow
          // traversing the subtree again here is not desired.
          onVisibilityChanged(this, visibility);
  
          if ((mPrivateFlags&PFLAG_DRAWABLE_STATE_DIRTY) != 0) {
              // If nobody has evaluated the drawable state yet, then do it now.
              refreshDrawableState();
          }
          needGlobalAttributesUpdate(false);
  
          notifyEnterOrExitForAutoFillIfNeeded(true);
          notifyAppearedOrDisappearedForContentCaptureIfNeeded(true);
      }
  
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
      void dispatchDetachedFromWindow() {
          AttachInfo info = mAttachInfo;
          if (info != null) {
              int vis = info.mWindowVisibility;
              if (vis != GONE) {
                  onWindowVisibilityChanged(GONE);
                  if (isShown()) {
                      // Invoking onVisibilityAggregated directly here since the subtree
                      // will also receive detached from window
                      onVisibilityAggregated(false);
                  }
              }
          }
  
          onDetachedFromWindow();
          onDetachedFromWindowInternal();
  
          InputMethodManager imm = getContext().getSystemService(InputMethodManager.class);
          if (imm != null) {
              imm.onViewDetachedFromWindow(this);
          }
  
          ListenerInfo li = mListenerInfo;
          final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners =
                  li != null ? li.mOnAttachStateChangeListeners : null;
          if (listeners != null && listeners.size() > 0) {
              // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to
              // perform the dispatching. The iterator is a safe guard against listeners that
              // could mutate the list by calling the various add/remove methods. This prevents
              // the array from being modified while we iterate it.
              for (OnAttachStateChangeListener listener : listeners) {
                  listener.onViewDetachedFromWindow(this);
              }
          }
  
          if ((mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0) {
              mAttachInfo.mScrollContainers.remove(this);
              mPrivateFlags &= ~PFLAG_SCROLL_CONTAINER_ADDED;
          }
  
          mAttachInfo = null;
          if (mOverlay != null) {
              mOverlay.getOverlayView().dispatchDetachedFromWindow();
          }
  
          notifyEnterOrExitForAutoFillIfNeeded(false);
          notifyAppearedOrDisappearedForContentCaptureIfNeeded(false);
      }
  
      /**
       * Cancel any deferred high-level input events that were previously posted to the event queue.
       *
       * <p>Many views post high-level events such as click handlers to the event queue
       * to run deferred in order to preserve a desired user experience - clearing visible
       * pressed states before executing, etc. This method will abort any events of this nature
       * that are currently in flight.</p>
       *
       * <p>Custom views that generate their own high-level deferred input events should override
       * {@link #onCancelPendingInputEvents()} and remove those pending events from the queue.</p>
       *
       * <p>This will also cancel pending input events for any child views.</p>
       *
       * <p>Note that this may not be sufficient as a debouncing strategy for clicks in all cases.
       * This will not impact newer events posted after this call that may occur as a result of
       * lower-level input events still waiting in the queue. If you are trying to prevent
       * double-submitted  events for the duration of some sort of asynchronous transaction
       * you should also take other steps to protect against unexpected double inputs e.g. calling
       * {@link #setEnabled(boolean) setEnabled(false)} and re-enabling the view when
       * the transaction completes, tracking already submitted transaction IDs, etc.</p>
       */
      public final void cancelPendingInputEvents() {
          dispatchCancelPendingInputEvents();
      }
  
      /**
       * Called by {@link #cancelPendingInputEvents()} to cancel input events in flight.
       * Overridden by ViewGroup to dispatch. Package scoped to prevent app-side meddling.
       */
      void dispatchCancelPendingInputEvents() {
          mPrivateFlags3 &= ~PFLAG3_CALLED_SUPER;
          onCancelPendingInputEvents();
          if ((mPrivateFlags3 & PFLAG3_CALLED_SUPER) != PFLAG3_CALLED_SUPER) {
              throw new SuperNotCalledException("View " + getClass().getSimpleName() +
                      " did not call through to super.onCancelPendingInputEvents()");
          }
      }
  
      /**
       * Called as the result of a call to {@link #cancelPendingInputEvents()} on this view or
       * a parent view.
       *
       * <p>This method is responsible for removing any pending high-level input events that were
       * posted to the event queue to run later. Custom view classes that post their own deferred
       * high-level events via {@link #post(Runnable)}, {@link #postDelayed(Runnable, long)} or
       * {@link android.os.Handler} should override this method, call
       * <code>super.onCancelPendingInputEvents()</code> and remove those callbacks as appropriate.
       * </p>
       */
      public void onCancelPendingInputEvents() {
          removePerformClickCallback();
          cancelLongPress();
          mPrivateFlags3 |= PFLAG3_CALLED_SUPER;
      }
  
      /**
       * Store this view hierarchy's frozen state into the given container.
       *
       * @param container The SparseArray in which to save the view's state.
       *
       * @see #restoreHierarchyState(android.util.SparseArray)
       * @see #dispatchSaveInstanceState(android.util.SparseArray)
       * @see #onSaveInstanceState()
       */
      public void saveHierarchyState(SparseArray<Parcelable> container) {
          dispatchSaveInstanceState(container);
      }
  
      /**
       * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for
       * this view and its children. May be overridden to modify how freezing happens to a
       * view's children; for example, some views may want to not store state for their children.
       *
       * @param container The SparseArray in which to save the view's state.
       *
       * @see #dispatchRestoreInstanceState(android.util.SparseArray)
       * @see #saveHierarchyState(android.util.SparseArray)
       * @see #onSaveInstanceState()
       */
      protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) {
          if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) {
              mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED;
              Parcelable state = onSaveInstanceState();
              if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) {
                  throw new IllegalStateException(
                          "Derived class did not call super.onSaveInstanceState()");
              }
              if (state != null) {
                  // Log.i("View", "Freezing #" + Integer.toHexString(mID)
                  // + ": " + state);
                  container.put(mID, state);
              }
          }
      }
  
      /**
       * Hook allowing a view to generate a representation of its internal state
       * that can later be used to create a new instance with that same state.
       * This state should only contain information that is not persistent or can
       * not be reconstructed later. For example, you will never store your
       * current position on screen because that will be computed again when a
       * new instance of the view is placed in its view hierarchy.
       * <p>
       * Some examples of things you may store here: the current cursor position
       * in a text view (but usually not the text itself since that is stored in a
       * content provider or other persistent storage), the currently selected
       * item in a list view.
       *
       * @return Returns a Parcelable object containing the view's current dynamic
       *         state, or null if there is nothing interesting to save.
       * @see #onRestoreInstanceState(Parcelable)
       * @see #saveHierarchyState(SparseArray)
       * @see #dispatchSaveInstanceState(SparseArray)
       * @see #setSaveEnabled(boolean)
       */
      @CallSuper
      @Nullable protected Parcelable onSaveInstanceState() {
          mPrivateFlags |= PFLAG_SAVE_STATE_CALLED;
          if (mStartActivityRequestWho != null || isAutofilled()
                  || mAutofillViewId > LAST_APP_AUTOFILL_ID) {
              BaseSavedState state = new BaseSavedState(AbsSavedState.EMPTY_STATE);
  
              if (mStartActivityRequestWho != null) {
                  state.mSavedData |= BaseSavedState.START_ACTIVITY_REQUESTED_WHO_SAVED;
              }
  
              if (isAutofilled()) {
                  state.mSavedData |= BaseSavedState.IS_AUTOFILLED;
              }
  
              if (mAutofillViewId > LAST_APP_AUTOFILL_ID) {
                  state.mSavedData |= BaseSavedState.AUTOFILL_ID;
              }
  
              state.mStartActivityRequestWhoSaved = mStartActivityRequestWho;
              state.mIsAutofilled = isAutofilled();
              state.mAutofillViewId = mAutofillViewId;
              return state;
          }
          return BaseSavedState.EMPTY_STATE;
      }
  
      /**
       * Restore this view hierarchy's frozen state from the given container.
       *
       * @param container The SparseArray which holds previously frozen states.
       *
       * @see #saveHierarchyState(android.util.SparseArray)
       * @see #dispatchRestoreInstanceState(android.util.SparseArray)
       * @see #onRestoreInstanceState(android.os.Parcelable)
       */
      public void restoreHierarchyState(SparseArray<Parcelable> container) {
          dispatchRestoreInstanceState(container);
      }
  
      /**
       * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the
       * state for this view and its children. May be overridden to modify how restoring
       * happens to a view's children; for example, some views may want to not store state
       * for their children.
       *
       * @param container The SparseArray which holds previously saved state.
       *
       * @see #dispatchSaveInstanceState(android.util.SparseArray)
       * @see #restoreHierarchyState(android.util.SparseArray)
       * @see #onRestoreInstanceState(android.os.Parcelable)
       */
      protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) {
          if (mID != NO_ID) {
              Parcelable state = container.get(mID);
              if (state != null) {
                  // Log.i("View", "Restoreing #" + Integer.toHexString(mID)
                  // + ": " + state);
                  mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED;
                  onRestoreInstanceState(state);
                  if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) {
                      throw new IllegalStateException(
                              "Derived class did not call super.onRestoreInstanceState()");
                  }
              }
          }
      }
  
      /**
       * Hook allowing a view to re-apply a representation of its internal state that had previously
       * been generated by {@link #onSaveInstanceState}. This function will never be called with a
       * null state.
       *
       * @param state The frozen state that had previously been returned by
       *        {@link #onSaveInstanceState}.
       *
       * @see #onSaveInstanceState()
       * @see #restoreHierarchyState(android.util.SparseArray)
       * @see #dispatchRestoreInstanceState(android.util.SparseArray)
       */
      @CallSuper
      protected void onRestoreInstanceState(Parcelable state) {
          mPrivateFlags |= PFLAG_SAVE_STATE_CALLED;
          if (state != null && !(state instanceof AbsSavedState)) {
              throw new IllegalArgumentException("Wrong state class, expecting View State but "
                      + "received " + state.getClass().toString() + " instead. This usually happens "
                      + "when two views of different type have the same id in the same hierarchy. "
                      + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure "
                      + "other views do not use the same id.");
          }
          if (state != null && state instanceof BaseSavedState) {
              BaseSavedState baseState = (BaseSavedState) state;
  
              if ((baseState.mSavedData & BaseSavedState.START_ACTIVITY_REQUESTED_WHO_SAVED) != 0) {
                  mStartActivityRequestWho = baseState.mStartActivityRequestWhoSaved;
              }
              if ((baseState.mSavedData & BaseSavedState.IS_AUTOFILLED) != 0) {
                  setAutofilled(baseState.mIsAutofilled);
              }
              if ((baseState.mSavedData & BaseSavedState.AUTOFILL_ID) != 0) {
                  // It can happen that views have the same view id and the restoration path will not
                  // be able to distinguish between them. The autofill id needs to be unique though.
                  // Hence prevent the same autofill view id from being restored multiple times.
                  ((BaseSavedState) state).mSavedData &= ~BaseSavedState.AUTOFILL_ID;
  
                  if ((mPrivateFlags3 & PFLAG3_AUTOFILLID_EXPLICITLY_SET) != 0) {
                      // Ignore when view already set it through setAutofillId();
                      if (Log.isLoggable(AUTOFILL_LOG_TAG, Log.DEBUG)) {
                          Log.d(AUTOFILL_LOG_TAG, "onRestoreInstanceState(): not setting autofillId "
                                  + "to " + baseState.mAutofillViewId + " because view explicitly set"
                                  + " it to " + mAutofillId);
                      }
                  } else {
                      mAutofillViewId = baseState.mAutofillViewId;
                      mAutofillId = null; // will be set on demand by getAutofillId()
                  }
              }
          }
      }
  
      /**
       * <p>Return the time at which the drawing of the view hierarchy started.</p>
       *
       * @return the drawing start time in milliseconds
       */
      public long getDrawingTime() {
          return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0;
      }
  
      /**
       * <p>Enables or disables the duplication of the parent's state into this view. When
       * duplication is enabled, this view gets its drawable state from its parent rather
       * than from its own internal properties.</p>
       *
       * <p>Note: in the current implementation, setting this property to true after the
       * view was added to a ViewGroup might have no effect at all. This property should
       * always be used from XML or set to true before adding this view to a ViewGroup.</p>
       *
       * <p>Note: if this view's parent addStateFromChildren property is enabled and this
       * property is enabled, an exception will be thrown.</p>
       *
       * <p>Note: if the child view uses and updates additional states which are unknown to the
       * parent, these states should not be affected by this method.</p>
       *
       * @param enabled True to enable duplication of the parent's drawable state, false
       *                to disable it.
       *
       * @see #getDrawableState()
       * @see #isDuplicateParentStateEnabled()
       */
      public void setDuplicateParentStateEnabled(boolean enabled) {
          setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE);
      }
  
      /**
       * <p>Indicates whether this duplicates its drawable state from its parent.</p>
       *
       * @return True if this view's drawable state is duplicated from the parent,
       *         false otherwise
       *
       * @see #getDrawableState()
       * @see #setDuplicateParentStateEnabled(boolean)
       */
      @InspectableProperty(name = "duplicateParentState")
      public boolean isDuplicateParentStateEnabled() {
          return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE;
      }
  
      /**
       * <p>Specifies the type of layer backing this view. The layer can be
       * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or
       * {@link #LAYER_TYPE_HARDWARE}.</p>
       *
       * <p>A layer is associated with an optional {@link android.graphics.Paint}
       * instance that controls how the layer is composed on screen. The following
       * properties of the paint are taken into account when composing the layer:</p>
       * <ul>
       * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li>
       * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li>
       * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li>
       * </ul>
       *
       * <p>If this view has an alpha value set to < 1.0 by calling
       * {@link #setAlpha(float)}, the alpha value of the layer's paint is superseded
       * by this view's alpha value.</p>
       *
       * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE},
       * {@link #LAYER_TYPE_SOFTWARE} and {@link #LAYER_TYPE_HARDWARE}
       * for more information on when and how to use layers.</p>
       *
       * @param layerType The type of layer to use with this view, must be one of
       *        {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or
       *        {@link #LAYER_TYPE_HARDWARE}
       * @param paint The paint used to compose the layer. This argument is optional
       *        and can be null. It is ignored when the layer type is
       *        {@link #LAYER_TYPE_NONE}
       *
       * @see #getLayerType()
       * @see #LAYER_TYPE_NONE
       * @see #LAYER_TYPE_SOFTWARE
       * @see #LAYER_TYPE_HARDWARE
       * @see #setAlpha(float)
       *
       * @attr ref android.R.styleable#View_layerType
       */
      public void setLayerType(@LayerType int layerType, @Nullable Paint paint) {
          if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) {
              throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, "
                      + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE");
          }
  
          boolean typeChanged = mRenderNode.setLayerType(layerType);
  
          if (!typeChanged) {
              setLayerPaint(paint);
              return;
          }
  
          if (layerType != LAYER_TYPE_SOFTWARE) {
              // Destroy any previous software drawing cache if present
              // NOTE: even if previous layer type is HW, we do this to ensure we've cleaned up
              // drawing cache created in View#draw when drawing to a SW canvas.
              destroyDrawingCache();
          }
  
          mLayerType = layerType;
          mLayerPaint = mLayerType == LAYER_TYPE_NONE ? null : paint;
          mRenderNode.setLayerPaint(mLayerPaint);
  
          // draw() behaves differently if we are on a layer, so we need to
          // invalidate() here
          invalidateParentCaches();
          invalidate(true);
      }
  
      /**
       * Updates the {@link Paint} object used with the current layer (used only if the current
       * layer type is not set to {@link #LAYER_TYPE_NONE}). Changed properties of the Paint
       * provided to {@link #setLayerType(int, android.graphics.Paint)} will be used the next time
       * the View is redrawn, but {@link #setLayerPaint(android.graphics.Paint)} must be called to
       * ensure that the view gets redrawn immediately.
       *
       * <p>A layer is associated with an optional {@link android.graphics.Paint}
       * instance that controls how the layer is composed on screen. The following
       * properties of the paint are taken into account when composing the layer:</p>
       * <ul>
       * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li>
       * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li>
       * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li>
       * </ul>
       *
       * <p>If this view has an alpha value set to < 1.0 by calling {@link #setAlpha(float)}, the
       * alpha value of the layer's paint is superseded by this view's alpha value.</p>
       *
       * @param paint The paint used to compose the layer. This argument is optional
       *        and can be null. It is ignored when the layer type is
       *        {@link #LAYER_TYPE_NONE}
       *
       * @see #setLayerType(int, android.graphics.Paint)
       */
      public void setLayerPaint(@Nullable Paint paint) {
          int layerType = getLayerType();
          if (layerType != LAYER_TYPE_NONE) {
              mLayerPaint = paint;
              if (layerType == LAYER_TYPE_HARDWARE) {
                  if (mRenderNode.setLayerPaint(paint)) {
                      invalidateViewProperty(false, false);
                  }
              } else {
                  invalidate();
              }
          }
      }
  
      /**
       * Indicates what type of layer is currently associated with this view. By default
       * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}.
       * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)}
       * for more information on the different types of layers.
       *
       * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or
       *         {@link #LAYER_TYPE_HARDWARE}
       *
       * @see #setLayerType(int, android.graphics.Paint)
       * @see #buildLayer()
       * @see #LAYER_TYPE_NONE
       * @see #LAYER_TYPE_SOFTWARE
       * @see #LAYER_TYPE_HARDWARE
       */
      @InspectableProperty(enumMapping = {
              @EnumEntry(value = LAYER_TYPE_NONE, name = "none"),
              @EnumEntry(value = LAYER_TYPE_SOFTWARE, name = "software"),
              @EnumEntry(value = LAYER_TYPE_HARDWARE, name = "hardware")
      })
      @LayerType
      public int getLayerType() {
          return mLayerType;
      }
  
      /**
       * Forces this view's layer to be created and this view to be rendered
       * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE},
       * invoking this method will have no effect.
       *
       * This method can for instance be used to render a view into its layer before
       * starting an animation. If this view is complex, rendering into the layer
       * before starting the animation will avoid skipping frames.
       *
       * @throws IllegalStateException If this view is not attached to a window
       *
       * @see #setLayerType(int, android.graphics.Paint)
       */
      public void buildLayer() {
          if (mLayerType == LAYER_TYPE_NONE) return;
  
          final AttachInfo attachInfo = mAttachInfo;
          if (attachInfo == null) {
              throw new IllegalStateException("This view must be attached to a window first");
          }
  
          if (getWidth() == 0 || getHeight() == 0) {
              return;
          }
  
          switch (mLayerType) {
              case LAYER_TYPE_HARDWARE:
                  updateDisplayListIfDirty();
                  if (attachInfo.mThreadedRenderer != null && mRenderNode.hasDisplayList()) {
                      attachInfo.mThreadedRenderer.buildLayer(mRenderNode);
                  }
                  break;
              case LAYER_TYPE_SOFTWARE:
                  buildDrawingCache(true);
                  break;
          }
      }
  
      /**
       * Destroys all hardware rendering resources. This method is invoked
       * when the system needs to reclaim resources. Upon execution of this
       * method, you should free any OpenGL resources created by the view.
       *
       * Note: you <strong>must</strong> call
       * <code>super.destroyHardwareResources()</code> when overriding
       * this method.
       *
       * @hide
       */
      @CallSuper
      @UnsupportedAppUsage
      protected void destroyHardwareResources() {
          if (mOverlay != null) {
              mOverlay.getOverlayView().destroyHardwareResources();
          }
          if (mGhostView != null) {
              mGhostView.destroyHardwareResources();
          }
      }
  
      /**
       * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call
       * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a
       * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when
       * the cache is enabled. To benefit from the cache, you must request the drawing cache by
       * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not
       * null.</p>
       *
       * <p>Enabling the drawing cache is similar to
       * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware
       * acceleration is turned off. When hardware acceleration is turned on, enabling the
       * drawing cache has no effect on rendering because the system uses a different mechanism
       * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even
       * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)}
       * for information on how to enable software and hardware layers.</p>
       *
       * <p>This API can be used to manually generate
       * a bitmap copy of this view, by setting the flag to <code>true</code> and calling
       * {@link #getDrawingCache()}.</p>
       *
       * @param enabled true to enable the drawing cache, false otherwise
       *
       * @see #isDrawingCacheEnabled()
       * @see #getDrawingCache()
       * @see #buildDrawingCache()
       * @see #setLayerType(int, android.graphics.Paint)
       *
       * @deprecated The view drawing cache was largely made obsolete with the introduction of
       * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache
       * layers are largely unnecessary and can easily result in a net loss in performance due to the
       * cost of creating and updating the layer. In the rare cases where caching layers are useful,
       * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware
       * rendering. For software-rendered snapshots of a small part of the View hierarchy or
       * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or
       * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these
       * software-rendered usages are discouraged and have compatibility issues with hardware-only
       * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE}
       * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback
       * reports or unit testing the {@link PixelCopy} API is recommended.
       */
      @Deprecated
      public void setDrawingCacheEnabled(boolean enabled) {
          mCachingFailed = false;
          setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED);
      }
  
      /**
       * <p>Indicates whether the drawing cache is enabled for this view.</p>
       *
       * @return true if the drawing cache is enabled
       *
       * @see #setDrawingCacheEnabled(boolean)
       * @see #getDrawingCache()
       *
       * @deprecated The view drawing cache was largely made obsolete with the introduction of
       * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache
       * layers are largely unnecessary and can easily result in a net loss in performance due to the
       * cost of creating and updating the layer. In the rare cases where caching layers are useful,
       * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware
       * rendering. For software-rendered snapshots of a small part of the View hierarchy or
       * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or
       * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these
       * software-rendered usages are discouraged and have compatibility issues with hardware-only
       * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE}
       * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback
       * reports or unit testing the {@link PixelCopy} API is recommended.
       */
      @Deprecated
      @ViewDebug.ExportedProperty(category = "drawing")
      public boolean isDrawingCacheEnabled() {
          return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED;
      }
  
      /**
       * Debugging utility which recursively outputs the dirty state of a view and its
       * descendants.
       *
       * @hide
       */
      @SuppressWarnings({"UnusedDeclaration"})
      public void outputDirtyFlags(String indent, boolean clear, int clearMask) {
          Log.d(VIEW_LOG_TAG, indent + this + "             DIRTY("
                  + (mPrivateFlags & View.PFLAG_DIRTY_MASK)
                  + ") DRAWN(" + (mPrivateFlags & PFLAG_DRAWN) + ")" + " CACHE_VALID("
                  + (mPrivateFlags & View.PFLAG_DRAWING_CACHE_VALID)
                  + ") INVALIDATED(" + (mPrivateFlags & PFLAG_INVALIDATED) + ")");
          if (clear) {
              mPrivateFlags &= clearMask;
          }
          if (this instanceof ViewGroup) {
              ViewGroup parent = (ViewGroup) this;
              final int count = parent.getChildCount();
              for (int i = 0; i < count; i++) {
                  final View child = parent.getChildAt(i);
                  child.outputDirtyFlags(indent + "  ", clear, clearMask);
              }
          }
      }
  
      /**
       * This method is used by ViewGroup to cause its children to restore or recreate their
       * display lists. It is called by getDisplayList() when the parent ViewGroup does not need
       * to recreate its own display list, which would happen if it went through the normal
       * draw/dispatchDraw mechanisms.
       *
       * @hide
       */
      protected void dispatchGetDisplayList() {}
  
      /**
       * A view that is not attached or hardware accelerated cannot create a display list.
       * This method checks these conditions and returns the appropriate result.
       *
       * @return true if view has the ability to create a display list, false otherwise.
       *
       * @hide
       */
      public boolean canHaveDisplayList() {
          return !(mAttachInfo == null || mAttachInfo.mThreadedRenderer == null);
      }
  
      /**
       * Gets the RenderNode for the view, and updates its DisplayList (if needed and supported)
       * @hide
       */
      @NonNull
      @UnsupportedAppUsage
      public RenderNode updateDisplayListIfDirty() {
          final RenderNode renderNode = mRenderNode;
          if (!canHaveDisplayList()) {
              // can't populate RenderNode, don't try
              return renderNode;
          }
  
          if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0
                  || !renderNode.hasDisplayList()
                  || (mRecreateDisplayList)) {
              // Don't need to recreate the display list, just need to tell our
              // children to restore/recreate theirs
              if (renderNode.hasDisplayList()
                      && !mRecreateDisplayList) {
                  mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID;
                  mPrivateFlags &= ~PFLAG_DIRTY_MASK;
                  dispatchGetDisplayList();
  
                  return renderNode; // no work needed
              }
  
              // If we got here, we're recreating it. Mark it as such to ensure that
              // we copy in child display lists into ours in drawChild()
              mRecreateDisplayList = true;
  
              int width = mRight - mLeft;
              int height = mBottom - mTop;
              int layerType = getLayerType();
  
              final RecordingCanvas canvas = renderNode.beginRecording(width, height);
  
              try {
                  if (layerType == LAYER_TYPE_SOFTWARE) {
                      buildDrawingCache(true);
                      Bitmap cache = getDrawingCache(true);
                      if (cache != null) {
                          canvas.drawBitmap(cache, 0, 0, mLayerPaint);
                      }
                  } else {
                      computeScroll();
  
                      canvas.translate(-mScrollX, -mScrollY);
                      mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID;
                      mPrivateFlags &= ~PFLAG_DIRTY_MASK;
  
                      // Fast path for layouts with no backgrounds
                      if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) {
                          dispatchDraw(canvas);
                          drawAutofilledHighlight(canvas);
                          if (mOverlay != null && !mOverlay.isEmpty()) {
                              mOverlay.getOverlayView().draw(canvas);
                          }
                          if (debugDraw()) {
                              debugDrawFocus(canvas);
                          }
                      } else {
                          draw(canvas);
                      }
                  }
              } finally {
                  renderNode.endRecording();
                  setDisplayListProperties(renderNode);
              }
          } else {
              mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID;
              mPrivateFlags &= ~PFLAG_DIRTY_MASK;
          }
          return renderNode;
      }
  
      @UnsupportedAppUsage
      private void resetDisplayList() {
          mRenderNode.discardDisplayList();
          if (mBackgroundRenderNode != null) {
              mBackgroundRenderNode.discardDisplayList();
          }
      }
  
      /**
       * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p>
       *
       * @return A non-scaled bitmap representing this view or null if cache is disabled.
       *
       * @see #getDrawingCache(boolean)
       *
       * @deprecated The view drawing cache was largely made obsolete with the introduction of
       * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache
       * layers are largely unnecessary and can easily result in a net loss in performance due to the
       * cost of creating and updating the layer. In the rare cases where caching layers are useful,
       * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware
       * rendering. For software-rendered snapshots of a small part of the View hierarchy or
       * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or
       * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these
       * software-rendered usages are discouraged and have compatibility issues with hardware-only
       * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE}
       * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback
       * reports or unit testing the {@link PixelCopy} API is recommended.
       */
      @Deprecated
      public Bitmap getDrawingCache() {
          return getDrawingCache(false);
      }
  
      /**
       * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap
       * is null when caching is disabled. If caching is enabled and the cache is not ready,
       * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not
       * draw from the cache when the cache is enabled. To benefit from the cache, you must
       * request the drawing cache by calling this method and draw it on screen if the
       * returned bitmap is not null.</p>
       *
       * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled,
       * this method will create a bitmap of the same size as this view. Because this bitmap
       * will be drawn scaled by the parent ViewGroup, the result on screen might show
       * scaling artifacts. To avoid such artifacts, you should call this method by setting
       * the auto scaling to true. Doing so, however, will generate a bitmap of a different
       * size than the view. This implies that your application must be able to handle this
       * size.</p>
       *
       * @param autoScale Indicates whether the generated bitmap should be scaled based on
       *        the current density of the screen when the application is in compatibility
       *        mode.
       *
       * @return A bitmap representing this view or null if cache is disabled.
       *
       * @see #setDrawingCacheEnabled(boolean)
       * @see #isDrawingCacheEnabled()
       * @see #buildDrawingCache(boolean)
       * @see #destroyDrawingCache()
       *
       * @deprecated The view drawing cache was largely made obsolete with the introduction of
       * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache
       * layers are largely unnecessary and can easily result in a net loss in performance due to the
       * cost of creating and updating the layer. In the rare cases where caching layers are useful,
       * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware
       * rendering. For software-rendered snapshots of a small part of the View hierarchy or
       * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or
       * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these
       * software-rendered usages are discouraged and have compatibility issues with hardware-only
       * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE}
       * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback
       * reports or unit testing the {@link PixelCopy} API is recommended.
       */
      @Deprecated
      public Bitmap getDrawingCache(boolean autoScale) {
          if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) {
              return null;
          }
          if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) {
              buildDrawingCache(autoScale);
          }
          return autoScale ? mDrawingCache : mUnscaledDrawingCache;
      }
  
      /**
       * <p>Frees the resources used by the drawing cache. If you call
       * {@link #buildDrawingCache()} manually without calling
       * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you
       * should cleanup the cache with this method afterwards.</p>
       *
       * @see #setDrawingCacheEnabled(boolean)
       * @see #buildDrawingCache()
       * @see #getDrawingCache()
       *
       * @deprecated The view drawing cache was largely made obsolete with the introduction of
       * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache
       * layers are largely unnecessary and can easily result in a net loss in performance due to the
       * cost of creating and updating the layer. In the rare cases where caching layers are useful,
       * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware
       * rendering. For software-rendered snapshots of a small part of the View hierarchy or
       * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or
       * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these
       * software-rendered usages are discouraged and have compatibility issues with hardware-only
       * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE}
       * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback
       * reports or unit testing the {@link PixelCopy} API is recommended.
       */
      @Deprecated
      public void destroyDrawingCache() {
          if (mDrawingCache != null) {
              mDrawingCache.recycle();
              mDrawingCache = null;
          }
          if (mUnscaledDrawingCache != null) {
              mUnscaledDrawingCache.recycle();
              mUnscaledDrawingCache = null;
          }
      }
  
      /**
       * Setting a solid background color for the drawing cache's bitmaps will improve
       * performance and memory usage. Note, though that this should only be used if this
       * view will always be drawn on top of a solid color.
       *
       * @param color The background color to use for the drawing cache's bitmap
       *
       * @see #setDrawingCacheEnabled(boolean)
       * @see #buildDrawingCache()
       * @see #getDrawingCache()
       *
       * @deprecated The view drawing cache was largely made obsolete with the introduction of
       * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache
       * layers are largely unnecessary and can easily result in a net loss in performance due to the
       * cost of creating and updating the layer. In the rare cases where caching layers are useful,
       * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware
       * rendering. For software-rendered snapshots of a small part of the View hierarchy or
       * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or
       * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these
       * software-rendered usages are discouraged and have compatibility issues with hardware-only
       * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE}
       * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback
       * reports or unit testing the {@link PixelCopy} API is recommended.
       */
      @Deprecated
      public void setDrawingCacheBackgroundColor(@ColorInt int color) {
          if (color != mDrawingCacheBackgroundColor) {
              mDrawingCacheBackgroundColor = color;
              mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
          }
      }
  
      /**
       * @see #setDrawingCacheBackgroundColor(int)
       *
       * @return The background color to used for the drawing cache's bitmap
       *
       * @deprecated The view drawing cache was largely made obsolete with the introduction of
       * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache
       * layers are largely unnecessary and can easily result in a net loss in performance due to the
       * cost of creating and updating the layer. In the rare cases where caching layers are useful,
       * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware
       * rendering. For software-rendered snapshots of a small part of the View hierarchy or
       * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or
       * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these
       * software-rendered usages are discouraged and have compatibility issues with hardware-only
       * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE}
       * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback
       * reports or unit testing the {@link PixelCopy} API is recommended.
       */
      @Deprecated
      @ColorInt
      public int getDrawingCacheBackgroundColor() {
          return mDrawingCacheBackgroundColor;
      }
  
      /**
       * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p>
       *
       * @see #buildDrawingCache(boolean)
       *
       * @deprecated The view drawing cache was largely made obsolete with the introduction of
       * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache
       * layers are largely unnecessary and can easily result in a net loss in performance due to the
       * cost of creating and updating the layer. In the rare cases where caching layers are useful,
       * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware
       * rendering. For software-rendered snapshots of a small part of the View hierarchy or
       * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or
       * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these
       * software-rendered usages are discouraged and have compatibility issues with hardware-only
       * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE}
       * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback
       * reports or unit testing the {@link PixelCopy} API is recommended.
       */
      @Deprecated
      public void buildDrawingCache() {
          buildDrawingCache(false);
      }
  
      /**
       * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p>
       *
       * <p>If you call {@link #buildDrawingCache()} manually without calling
       * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you
       * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p>
       *
       * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled,
       * this method will create a bitmap of the same size as this view. Because this bitmap
       * will be drawn scaled by the parent ViewGroup, the result on screen might show
       * scaling artifacts. To avoid such artifacts, you should call this method by setting
       * the auto scaling to true. Doing so, however, will generate a bitmap of a different
       * size than the view. This implies that your application must be able to handle this
       * size.</p>
       *
       * <p>You should avoid calling this method when hardware acceleration is enabled. If
       * you do not need the drawing cache bitmap, calling this method will increase memory
       * usage and cause the view to be rendered in software once, thus negatively impacting
       * performance.</p>
       *
       * @see #getDrawingCache()
       * @see #destroyDrawingCache()
       *
       * @deprecated The view drawing cache was largely made obsolete with the introduction of
       * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache
       * layers are largely unnecessary and can easily result in a net loss in performance due to the
       * cost of creating and updating the layer. In the rare cases where caching layers are useful,
       * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware
       * rendering. For software-rendered snapshots of a small part of the View hierarchy or
       * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or
       * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these
       * software-rendered usages are discouraged and have compatibility issues with hardware-only
       * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE}
       * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback
       * reports or unit testing the {@link PixelCopy} API is recommended.
       */
      @Deprecated
      public void buildDrawingCache(boolean autoScale) {
          if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || (autoScale ?
                  mDrawingCache == null : mUnscaledDrawingCache == null)) {
              if (Trace.isTagEnabled(Trace.TRACE_TAG_VIEW)) {
                  Trace.traceBegin(Trace.TRACE_TAG_VIEW,
                          "buildDrawingCache/SW Layer for " + getClass().getSimpleName());
              }
              try {
                  buildDrawingCacheImpl(autoScale);
              } finally {
                  Trace.traceEnd(Trace.TRACE_TAG_VIEW);
              }
          }
      }
  
      /**
       * private, internal implementation of buildDrawingCache, used to enable tracing
       */
      private void buildDrawingCacheImpl(boolean autoScale) {
          mCachingFailed = false;
  
          int width = mRight - mLeft;
          int height = mBottom - mTop;
  
          final AttachInfo attachInfo = mAttachInfo;
          final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired;
  
          if (autoScale && scalingRequired) {
              width = (int) ((width * attachInfo.mApplicationScale) + 0.5f);
              height = (int) ((height * attachInfo.mApplicationScale) + 0.5f);
          }
  
          final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor;
          final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque();
          final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache;
  
          final long projectedBitmapSize = width * height * (opaque && !use32BitCache ? 2 : 4);
          final long drawingCacheSize =
                  ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize();
          if (width <= 0 || height <= 0 || projectedBitmapSize > drawingCacheSize) {
              if (width > 0 && height > 0) {
                  Log.w(VIEW_LOG_TAG, getClass().getSimpleName() + " not displayed because it is"
                          + " too large to fit into a software layer (or drawing cache), needs "
                          + projectedBitmapSize + " bytes, only "
                          + drawingCacheSize + " available");
              }
              destroyDrawingCache();
              mCachingFailed = true;
              return;
          }
  
          boolean clear = true;
          Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache;
  
          if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) {
              Bitmap.Config quality;
              if (!opaque) {
                  // Never pick ARGB_4444 because it looks awful
                  // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case
                  switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) {
                      case DRAWING_CACHE_QUALITY_AUTO:
                      case DRAWING_CACHE_QUALITY_LOW:
                      case DRAWING_CACHE_QUALITY_HIGH:
                      default:
                          quality = Bitmap.Config.ARGB_8888;
                          break;
                  }
              } else {
                  // Optimization for translucent windows
                  // If the window is translucent, use a 32 bits bitmap to benefit from memcpy()
                  quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
              }
  
              // Try to cleanup memory
              if (bitmap != null) bitmap.recycle();
  
              try {
                  bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(),
                          width, height, quality);
                  bitmap.setDensity(getResources().getDisplayMetrics().densityDpi);
                  if (autoScale) {
                      mDrawingCache = bitmap;
                  } else {
                      mUnscaledDrawingCache = bitmap;
                  }
                  if (opaque && use32BitCache) bitmap.setHasAlpha(false);
              } catch (OutOfMemoryError e) {
                  // If there is not enough memory to create the bitmap cache, just
                  // ignore the issue as bitmap caches are not required to draw the
                  // view hierarchy
                  if (autoScale) {
                      mDrawingCache = null;
                  } else {
                      mUnscaledDrawingCache = null;
                  }
                  mCachingFailed = true;
                  return;
              }
  
              clear = drawingCacheBackgroundColor != 0;
          }
  
          Canvas canvas;
          if (attachInfo != null) {
              canvas = attachInfo.mCanvas;
              if (canvas == null) {
                  canvas = new Canvas();
              }
              canvas.setBitmap(bitmap);
              // Temporarily clobber the cached Canvas in case one of our children
              // is also using a drawing cache. Without this, the children would
              // steal the canvas by attaching their own bitmap to it and bad, bad
              // thing would happen (invisible views, corrupted drawings, etc.)
              attachInfo.mCanvas = null;
          } else {
              // This case should hopefully never or seldom happen
              canvas = new Canvas(bitmap);
          }
  
          if (clear) {
              bitmap.eraseColor(drawingCacheBackgroundColor);
          }
  
          computeScroll();
          final int restoreCount = canvas.save();
  
          if (autoScale && scalingRequired) {
              final float scale = attachInfo.mApplicationScale;
              canvas.scale(scale, scale);
          }
  
          canvas.translate(-mScrollX, -mScrollY);
  
          mPrivateFlags |= PFLAG_DRAWN;
          if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated ||
                  mLayerType != LAYER_TYPE_NONE) {
              mPrivateFlags |= PFLAG_DRAWING_CACHE_VALID;
          }
  
          // Fast path for layouts with no backgrounds
          if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) {
              mPrivateFlags &= ~PFLAG_DIRTY_MASK;
              dispatchDraw(canvas);
              drawAutofilledHighlight(canvas);
              if (mOverlay != null && !mOverlay.isEmpty()) {
                  mOverlay.getOverlayView().draw(canvas);
              }
          } else {
              draw(canvas);
          }
  
          canvas.restoreToCount(restoreCount);
          canvas.setBitmap(null);
  
          if (attachInfo != null) {
              // Restore the cached Canvas for our siblings
              attachInfo.mCanvas = canvas;
          }
      }
  
      /**
       * Create a snapshot of the view into a bitmap.  We should probably make
       * some form of this public, but should think about the API.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public Bitmap createSnapshot(ViewDebug.CanvasProvider canvasProvider, boolean skipChildren) {
          int width = mRight - mLeft;
          int height = mBottom - mTop;
  
          final AttachInfo attachInfo = mAttachInfo;
          final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f;
          width = (int) ((width * scale) + 0.5f);
          height = (int) ((height * scale) + 0.5f);
  
          Canvas oldCanvas = null;
          try {
              Canvas canvas = canvasProvider.getCanvas(this,
                      width > 0 ? width : 1, height > 0 ? height : 1);
  
              if (attachInfo != null) {
                  oldCanvas = attachInfo.mCanvas;
                  // Temporarily clobber the cached Canvas in case one of our children
                  // is also using a drawing cache. Without this, the children would
                  // steal the canvas by attaching their own bitmap to it and bad, bad
                  // things would happen (invisible views, corrupted drawings, etc.)
                  attachInfo.mCanvas = null;
              }
  
              computeScroll();
              final int restoreCount = canvas.save();
              canvas.scale(scale, scale);
              canvas.translate(-mScrollX, -mScrollY);
  
              // Temporarily remove the dirty mask
              int flags = mPrivateFlags;
              mPrivateFlags &= ~PFLAG_DIRTY_MASK;
  
              // Fast path for layouts with no backgrounds
              if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) {
                  dispatchDraw(canvas);
                  drawAutofilledHighlight(canvas);
                  if (mOverlay != null && !mOverlay.isEmpty()) {
                      mOverlay.getOverlayView().draw(canvas);
                  }
              } else {
                  draw(canvas);
              }
  
              mPrivateFlags = flags;
              canvas.restoreToCount(restoreCount);
              return canvasProvider.createBitmap();
          } finally {
              if (oldCanvas != null) {
                  attachInfo.mCanvas = oldCanvas;
              }
          }
      }
  
      /**
       * Indicates whether this View is currently in edit mode. A View is usually
       * in edit mode when displayed within a developer tool. For instance, if
       * this View is being drawn by a visual user interface builder, this method
       * should return true.
       *
       * Subclasses should check the return value of this method to provide
       * different behaviors if their normal behavior might interfere with the
       * host environment. For instance: the class spawns a thread in its
       * constructor, the drawing code relies on device-specific features, etc.
       *
       * This method is usually checked in the drawing code of custom widgets.
       *
       * @return True if this View is in edit mode, false otherwise.
       */
      public boolean isInEditMode() {
          return false;
      }
  
      /**
       * If the View draws content inside its padding and enables fading edges,
       * it needs to support padding offsets. Padding offsets are added to the
       * fading edges to extend the length of the fade so that it covers pixels
       * drawn inside the padding.
       *
       * Subclasses of this class should override this method if they need
       * to draw content inside the padding.
       *
       * @return True if padding offset must be applied, false otherwise.
       *
       * @see #getLeftPaddingOffset()
       * @see #getRightPaddingOffset()
       * @see #getTopPaddingOffset()
       * @see #getBottomPaddingOffset()
       *
       * @since CURRENT
       */
      protected boolean isPaddingOffsetRequired() {
          return false;
      }
  
      /**
       * Amount by which to extend the left fading region. Called only when
       * {@link #isPaddingOffsetRequired()} returns true.
       *
       * @return The left padding offset in pixels.
       *
       * @see #isPaddingOffsetRequired()
       *
       * @since CURRENT
       */
      protected int getLeftPaddingOffset() {
          return 0;
      }
  
      /**
       * Amount by which to extend the right fading region. Called only when
       * {@link #isPaddingOffsetRequired()} returns true.
       *
       * @return The right padding offset in pixels.
       *
       * @see #isPaddingOffsetRequired()
       *
       * @since CURRENT
       */
      protected int getRightPaddingOffset() {
          return 0;
      }
  
      /**
       * Amount by which to extend the top fading region. Called only when
       * {@link #isPaddingOffsetRequired()} returns true.
       *
       * @return The top padding offset in pixels.
       *
       * @see #isPaddingOffsetRequired()
       *
       * @since CURRENT
       */
      protected int getTopPaddingOffset() {
          return 0;
      }
  
      /**
       * Amount by which to extend the bottom fading region. Called only when
       * {@link #isPaddingOffsetRequired()} returns true.
       *
       * @return The bottom padding offset in pixels.
       *
       * @see #isPaddingOffsetRequired()
       *
       * @since CURRENT
       */
      protected int getBottomPaddingOffset() {
          return 0;
      }
  
      /**
       * @hide
       * @param offsetRequired
       */
      protected int getFadeTop(boolean offsetRequired) {
          int top = mPaddingTop;
          if (offsetRequired) top += getTopPaddingOffset();
          return top;
      }
  
      /**
       * @hide
       * @param offsetRequired
       */
      protected int getFadeHeight(boolean offsetRequired) {
          int padding = mPaddingTop;
          if (offsetRequired) padding += getTopPaddingOffset();
          return mBottom - mTop - mPaddingBottom - padding;
      }
  
      /**
       * <p>Indicates whether this view is attached to a hardware accelerated
       * window or not.</p>
       *
       * <p>Even if this method returns true, it does not mean that every call
       * to {@link #draw(android.graphics.Canvas)} will be made with an hardware
       * accelerated {@link android.graphics.Canvas}. For instance, if this view
       * is drawn onto an offscreen {@link android.graphics.Bitmap} and its
       * window is hardware accelerated,
       * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely
       * return false, and this method will return true.</p>
       *
       * @return True if the view is attached to a window and the window is
       *         hardware accelerated; false in any other case.
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      public boolean isHardwareAccelerated() {
          return mAttachInfo != null && mAttachInfo.mHardwareAccelerated;
      }
  
      /**
       * Sets a rectangular area on this view to which the view will be clipped
       * when it is drawn. Setting the value to null will remove the clip bounds
       * and the view will draw normally, using its full bounds.
       *
       * @param clipBounds The rectangular area, in the local coordinates of
       * this view, to which future drawing operations will be clipped.
       */
      public void setClipBounds(Rect clipBounds) {
          if (clipBounds == mClipBounds
                  || (clipBounds != null && clipBounds.equals(mClipBounds))) {
              return;
          }
          if (clipBounds != null) {
              if (mClipBounds == null) {
                  mClipBounds = new Rect(clipBounds);
              } else {
                  mClipBounds.set(clipBounds);
              }
          } else {
              mClipBounds = null;
          }
          mRenderNode.setClipRect(mClipBounds);
          invalidateViewProperty(false, false);
      }
  
      /**
       * Returns a copy of the current {@link #setClipBounds(Rect) clipBounds}.
       *
       * @return A copy of the current clip bounds if clip bounds are set,
       * otherwise null.
       */
      public Rect getClipBounds() {
          return (mClipBounds != null) ? new Rect(mClipBounds) : null;
      }
  
  
      /**
       * Populates an output rectangle with the clip bounds of the view,
       * returning {@code true} if successful or {@code false} if the view's
       * clip bounds are {@code null}.
       *
       * @param outRect rectangle in which to place the clip bounds of the view
       * @return {@code true} if successful or {@code false} if the view's
       *         clip bounds are {@code null}
       */
      public boolean getClipBounds(Rect outRect) {
          if (mClipBounds != null) {
              outRect.set(mClipBounds);
              return true;
          }
          return false;
      }
  
      /**
       * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common
       * case of an active Animation being run on the view.
       */
      private boolean applyLegacyAnimation(ViewGroup parent, long drawingTime,
              Animation a, boolean scalingRequired) {
          Transformation invalidationTransform;
          final int flags = parent.mGroupFlags;
          final boolean initialized = a.isInitialized();
          if (!initialized) {
              a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight());
              a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop);
              if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler);
              onAnimationStart();
          }
  
          final Transformation t = parent.getChildTransformation();
          boolean more = a.getTransformation(drawingTime, t, 1f);
          if (scalingRequired && mAttachInfo.mApplicationScale != 1f) {
              if (parent.mInvalidationTransformation == null) {
                  parent.mInvalidationTransformation = new Transformation();
              }
              invalidationTransform = parent.mInvalidationTransformation;
              a.getTransformation(drawingTime, invalidationTransform, 1f);
          } else {
              invalidationTransform = t;
          }
  
          if (more) {
              if (!a.willChangeBounds()) {
                  if ((flags & (ViewGroup.FLAG_OPTIMIZE_INVALIDATE | ViewGroup.FLAG_ANIMATION_DONE)) ==
                          ViewGroup.FLAG_OPTIMIZE_INVALIDATE) {
                      parent.mGroupFlags |= ViewGroup.FLAG_INVALIDATE_REQUIRED;
                  } else if ((flags & ViewGroup.FLAG_INVALIDATE_REQUIRED) == 0) {
                      // The child need to draw an animation, potentially offscreen, so
                      // make sure we do not cancel invalidate requests
                      parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION;
                      parent.invalidate(mLeft, mTop, mRight, mBottom);
                  }
              } else {
                  if (parent.mInvalidateRegion == null) {
                      parent.mInvalidateRegion = new RectF();
                  }
                  final RectF region = parent.mInvalidateRegion;
                  a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region,
                          invalidationTransform);
  
                  // The child need to draw an animation, potentially offscreen, so
                  // make sure we do not cancel invalidate requests
                  parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION;
  
                  final int left = mLeft + (int) region.left;
                  final int top = mTop + (int) region.top;
                  parent.invalidate(left, top, left + (int) (region.width() + .5f),
                          top + (int) (region.height() + .5f));
              }
          }
          return more;
      }
  
      /**
       * This method is called by getDisplayList() when a display list is recorded for a View.
       * It pushes any properties to the RenderNode that aren't managed by the RenderNode.
       */
      void setDisplayListProperties(RenderNode renderNode) {
          if (renderNode != null) {
              renderNode.setHasOverlappingRendering(getHasOverlappingRendering());
              renderNode.setClipToBounds(mParent instanceof ViewGroup
                      && ((ViewGroup) mParent).getClipChildren());
  
              float alpha = 1;
              if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags &
                      ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) {
                  ViewGroup parentVG = (ViewGroup) mParent;
                  final Transformation t = parentVG.getChildTransformation();
                  if (parentVG.getChildStaticTransformation(this, t)) {
                      final int transformType = t.getTransformationType();
                      if (transformType != Transformation.TYPE_IDENTITY) {
                          if ((transformType & Transformation.TYPE_ALPHA) != 0) {
                              alpha = t.getAlpha();
                          }
                          if ((transformType & Transformation.TYPE_MATRIX) != 0) {
                              renderNode.setStaticMatrix(t.getMatrix());
                          }
                      }
                  }
              }
              if (mTransformationInfo != null) {
                  alpha *= getFinalAlpha();
                  if (alpha < 1) {
                      final int multipliedAlpha = (int) (255 * alpha);
                      if (onSetAlpha(multipliedAlpha)) {
                          alpha = 1;
                      }
                  }
                  renderNode.setAlpha(alpha);
              } else if (alpha < 1) {
                  renderNode.setAlpha(alpha);
              }
          }
      }
  
      /**
       * This method is called by ViewGroup.drawChild() to have each child view draw itself.
       *
       * This is where the View specializes rendering behavior based on layer type,
       * and hardware acceleration.
       */
      boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) {
          final boolean hardwareAcceleratedCanvas = canvas.isHardwareAccelerated();
          /* If an attached view draws to a HW canvas, it may use its RenderNode + DisplayList.
           *
           * If a view is dettached, its DisplayList shouldn't exist. If the canvas isn't
           * HW accelerated, it can't handle drawing RenderNodes.
           */
          boolean drawingWithRenderNode = mAttachInfo != null
                  && mAttachInfo.mHardwareAccelerated
                  && hardwareAcceleratedCanvas;
  
          boolean more = false;
          final boolean childHasIdentityMatrix = hasIdentityMatrix();
          final int parentFlags = parent.mGroupFlags;
  
          if ((parentFlags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) != 0) {
              parent.getChildTransformation().clear();
              parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION;
          }
  
          Transformation transformToApply = null;
          boolean concatMatrix = false;
          final boolean scalingRequired = mAttachInfo != null && mAttachInfo.mScalingRequired;
          final Animation a = getAnimation();
          if (a != null) {
              more = applyLegacyAnimation(parent, drawingTime, a, scalingRequired);
              concatMatrix = a.willChangeTransformationMatrix();
              if (concatMatrix) {
                  mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_TRANSFORM;
              }
              transformToApply = parent.getChildTransformation();
          } else {
              if ((mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_TRANSFORM) != 0) {
                  // No longer animating: clear out old animation matrix
                  mRenderNode.setAnimationMatrix(null);
                  mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_TRANSFORM;
              }
              if (!drawingWithRenderNode
                      && (parentFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) {
                  final Transformation t = parent.getChildTransformation();
                  final boolean hasTransform = parent.getChildStaticTransformation(this, t);
                  if (hasTransform) {
                      final int transformType = t.getTransformationType();
                      transformToApply = transformType != Transformation.TYPE_IDENTITY ? t : null;
                      concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0;
                  }
              }
          }
  
          concatMatrix |= !childHasIdentityMatrix;
  
          // Sets the flag as early as possible to allow draw() implementations
          // to call invalidate() successfully when doing animations
          mPrivateFlags |= PFLAG_DRAWN;
  
          if (!concatMatrix &&
                  (parentFlags & (ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS |
                          ViewGroup.FLAG_CLIP_CHILDREN)) == ViewGroup.FLAG_CLIP_CHILDREN &&
                  canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) &&
                  (mPrivateFlags & PFLAG_DRAW_ANIMATION) == 0) {
              mPrivateFlags2 |= PFLAG2_VIEW_QUICK_REJECTED;
              return more;
          }
          mPrivateFlags2 &= ~PFLAG2_VIEW_QUICK_REJECTED;
  
          if (hardwareAcceleratedCanvas) {
              // Clear INVALIDATED flag to allow invalidation to occur during rendering, but
              // retain the flag's value temporarily in the mRecreateDisplayList flag
              mRecreateDisplayList = (mPrivateFlags & PFLAG_INVALIDATED) != 0;
              mPrivateFlags &= ~PFLAG_INVALIDATED;
          }
  
          RenderNode renderNode = null;
          Bitmap cache = null;
          int layerType = getLayerType(); // TODO: signify cache state with just 'cache' local
          if (layerType == LAYER_TYPE_SOFTWARE || !drawingWithRenderNode) {
               if (layerType != LAYER_TYPE_NONE) {
                   // If not drawing with RenderNode, treat HW layers as SW
                   layerType = LAYER_TYPE_SOFTWARE;
                   buildDrawingCache(true);
              }
              cache = getDrawingCache(true);
          }
  
          if (drawingWithRenderNode) {
              // Delay getting the display list until animation-driven alpha values are
              // set up and possibly passed on to the view
              renderNode = updateDisplayListIfDirty();
              if (!renderNode.hasDisplayList()) {
                  // Uncommon, but possible. If a view is removed from the hierarchy during the call
                  // to getDisplayList(), the display list will be marked invalid and we should not
                  // try to use it again.
                  renderNode = null;
                  drawingWithRenderNode = false;
              }
          }
  
          int sx = 0;
          int sy = 0;
          if (!drawingWithRenderNode) {
              computeScroll();
              sx = mScrollX;
              sy = mScrollY;
          }
  
          final boolean drawingWithDrawingCache = cache != null && !drawingWithRenderNode;
          final boolean offsetForScroll = cache == null && !drawingWithRenderNode;
  
          int restoreTo = -1;
          if (!drawingWithRenderNode || transformToApply != null) {
              restoreTo = canvas.save();
          }
          if (offsetForScroll) {
              canvas.translate(mLeft - sx, mTop - sy);
          } else {
              if (!drawingWithRenderNode) {
                  canvas.translate(mLeft, mTop);
              }
              if (scalingRequired) {
                  if (drawingWithRenderNode) {
                      // TODO: Might not need this if we put everything inside the DL
                      restoreTo = canvas.save();
                  }
                  // mAttachInfo cannot be null, otherwise scalingRequired == false
                  final float scale = 1.0f / mAttachInfo.mApplicationScale;
                  canvas.scale(scale, scale);
              }
          }
  
          float alpha = drawingWithRenderNode ? 1 : (getAlpha() * getTransitionAlpha());
          if (transformToApply != null
                  || alpha < 1
                  || !hasIdentityMatrix()
                  || (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) != 0) {
              if (transformToApply != null || !childHasIdentityMatrix) {
                  int transX = 0;
                  int transY = 0;
  
                  if (offsetForScroll) {
                      transX = -sx;
                      transY = -sy;
                  }
  
                  if (transformToApply != null) {
                      if (concatMatrix) {
                          if (drawingWithRenderNode) {
                              renderNode.setAnimationMatrix(transformToApply.getMatrix());
                          } else {
                              // Undo the scroll translation, apply the transformation matrix,
                              // then redo the scroll translate to get the correct result.
                              canvas.translate(-transX, -transY);
                              canvas.concat(transformToApply.getMatrix());
                              canvas.translate(transX, transY);
                          }
                          parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION;
                      }
  
                      float transformAlpha = transformToApply.getAlpha();
                      if (transformAlpha < 1) {
                          alpha *= transformAlpha;
                          parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION;
                      }
                  }
  
                  if (!childHasIdentityMatrix && !drawingWithRenderNode) {
                      canvas.translate(-transX, -transY);
                      canvas.concat(getMatrix());
                      canvas.translate(transX, transY);
                  }
              }
  
              // Deal with alpha if it is or used to be <1
              if (alpha < 1 || (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) != 0) {
                  if (alpha < 1) {
                      mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_ALPHA;
                  } else {
                      mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_ALPHA;
                  }
                  parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION;
                  if (!drawingWithDrawingCache) {
                      final int multipliedAlpha = (int) (255 * alpha);
                      if (!onSetAlpha(multipliedAlpha)) {
                          if (drawingWithRenderNode) {
                              renderNode.setAlpha(alpha * getAlpha() * getTransitionAlpha());
                          } else if (layerType == LAYER_TYPE_NONE) {
                              canvas.saveLayerAlpha(sx, sy, sx + getWidth(), sy + getHeight(),
                                      multipliedAlpha);
                          }
                      } else {
                          // Alpha is handled by the child directly, clobber the layer's alpha
                          mPrivateFlags |= PFLAG_ALPHA_SET;
                      }
                  }
              }
          } else if ((mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) {
              onSetAlpha(255);
              mPrivateFlags &= ~PFLAG_ALPHA_SET;
          }
  
          if (!drawingWithRenderNode) {
              // apply clips directly, since RenderNode won't do it for this draw
              if ((parentFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 && cache == null) {
                  if (offsetForScroll) {
                      canvas.clipRect(sx, sy, sx + getWidth(), sy + getHeight());
                  } else {
                      if (!scalingRequired || cache == null) {
                          canvas.clipRect(0, 0, getWidth(), getHeight());
                      } else {
                          canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight());
                      }
                  }
              }
  
              if (mClipBounds != null) {
                  // clip bounds ignore scroll
                  canvas.clipRect(mClipBounds);
              }
          }
  
          if (!drawingWithDrawingCache) {
              if (drawingWithRenderNode) {
                  mPrivateFlags &= ~PFLAG_DIRTY_MASK;
                  ((RecordingCanvas) canvas).drawRenderNode(renderNode);
              } else {
                  // Fast path for layouts with no backgrounds
                  if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) {
                      mPrivateFlags &= ~PFLAG_DIRTY_MASK;
                      dispatchDraw(canvas);
                  } else {
                      draw(canvas);
                  }
              }
          } else if (cache != null) {
              mPrivateFlags &= ~PFLAG_DIRTY_MASK;
              if (layerType == LAYER_TYPE_NONE || mLayerPaint == null) {
                  // no layer paint, use temporary paint to draw bitmap
                  Paint cachePaint = parent.mCachePaint;
                  if (cachePaint == null) {
                      cachePaint = new Paint();
                      cachePaint.setDither(false);
                      parent.mCachePaint = cachePaint;
                  }
                  cachePaint.setAlpha((int) (alpha * 255));
                  canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint);
              } else {
                  // use layer paint to draw the bitmap, merging the two alphas, but also restore
                  int layerPaintAlpha = mLayerPaint.getAlpha();
                  if (alpha < 1) {
                      mLayerPaint.setAlpha((int) (alpha * layerPaintAlpha));
                  }
                  canvas.drawBitmap(cache, 0.0f, 0.0f, mLayerPaint);
                  if (alpha < 1) {
                      mLayerPaint.setAlpha(layerPaintAlpha);
                  }
              }
          }
  
          if (restoreTo >= 0) {
              canvas.restoreToCount(restoreTo);
          }
  
          if (a != null && !more) {
              if (!hardwareAcceleratedCanvas && !a.getFillAfter()) {
                  onSetAlpha(255);
              }
              parent.finishAnimatingView(this, a);
          }
  
          if (more && hardwareAcceleratedCanvas) {
              if (a.hasAlpha() && (mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) {
                  // alpha animations should cause the child to recreate its display list
                  invalidate(true);
              }
          }
  
          mRecreateDisplayList = false;
  
          return more;
      }
  
      static Paint getDebugPaint() {
          if (sDebugPaint == null) {
              sDebugPaint = new Paint();
              sDebugPaint.setAntiAlias(false);
          }
          return sDebugPaint;
      }
  
      final int dipsToPixels(int dips) {
          float scale = getContext().getResources().getDisplayMetrics().density;
          return (int) (dips * scale + 0.5f);
      }
  
      final private void debugDrawFocus(Canvas canvas) {
          if (isFocused()) {
              final int cornerSquareSize = dipsToPixels(DEBUG_CORNERS_SIZE_DIP);
              final int l = mScrollX;
              final int r = l + mRight - mLeft;
              final int t = mScrollY;
              final int b = t + mBottom - mTop;
  
              final Paint paint = getDebugPaint();
              paint.setColor(DEBUG_CORNERS_COLOR);
  
              // Draw squares in corners.
              paint.setStyle(Paint.Style.FILL);
              canvas.drawRect(l, t, l + cornerSquareSize, t + cornerSquareSize, paint);
              canvas.drawRect(r - cornerSquareSize, t, r, t + cornerSquareSize, paint);
              canvas.drawRect(l, b - cornerSquareSize, l + cornerSquareSize, b, paint);
              canvas.drawRect(r - cornerSquareSize, b - cornerSquareSize, r, b, paint);
  
              // Draw big X across the view.
              paint.setStyle(Paint.Style.STROKE);
              canvas.drawLine(l, t, r, b, paint);
              canvas.drawLine(l, b, r, t, paint);
          }
      }
  
      /**
       * Manually render this view (and all of its children) to the given Canvas.
       * The view must have already done a full layout before this function is
       * called.  When implementing a view, implement
       * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method.
       * If you do need to override this method, call the superclass version.
       *
       * @param canvas The Canvas to which the View is rendered.
       */
      @CallSuper
      public void draw(Canvas canvas) {
          final int privateFlags = mPrivateFlags;
          mPrivateFlags = (privateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN;
  
          /*
           * Draw traversal performs several drawing steps which must be executed
           * in the appropriate order:
           *
           *      1. Draw the background
           *      2. If necessary, save the canvas' layers to prepare for fading
           *      3. Draw view's content
           *      4. Draw children
           *      5. If necessary, draw the fading edges and restore layers
           *      6. Draw decorations (scrollbars for instance)
           */
  
          // Step 1, draw the background, if needed
          int saveCount;
  
          drawBackground(canvas);
  
          // skip step 2 & 5 if possible (common case)
          final int viewFlags = mViewFlags;
          boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0;
          boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0;
          if (!verticalEdges && !horizontalEdges) {
              // Step 3, draw the content
              onDraw(canvas);
  
              // Step 4, draw the children
              dispatchDraw(canvas);
  
              drawAutofilledHighlight(canvas);
  
              // Overlay is part of the content and draws beneath Foreground
              if (mOverlay != null && !mOverlay.isEmpty()) {
                  mOverlay.getOverlayView().dispatchDraw(canvas);
              }
  
              // Step 6, draw decorations (foreground, scrollbars)
              onDrawForeground(canvas);
  
              // Step 7, draw the default focus highlight
              drawDefaultFocusHighlight(canvas);
  
              if (debugDraw()) {
                  debugDrawFocus(canvas);
              }
  
              // we're done...
              return;
          }
  
          /*
           * Here we do the full fledged routine...
           * (this is an uncommon case where speed matters less,
           * this is why we repeat some of the tests that have been
           * done above)
           */
  
          boolean drawTop = false;
          boolean drawBottom = false;
          boolean drawLeft = false;
          boolean drawRight = false;
  
          float topFadeStrength = 0.0f;
          float bottomFadeStrength = 0.0f;
          float leftFadeStrength = 0.0f;
          float rightFadeStrength = 0.0f;
  
          // Step 2, save the canvas' layers
          int paddingLeft = mPaddingLeft;
  
          final boolean offsetRequired = isPaddingOffsetRequired();
          if (offsetRequired) {
              paddingLeft += getLeftPaddingOffset();
          }
  
          int left = mScrollX + paddingLeft;
          int right = left + mRight - mLeft - mPaddingRight - paddingLeft;
          int top = mScrollY + getFadeTop(offsetRequired);
          int bottom = top + getFadeHeight(offsetRequired);
  
          if (offsetRequired) {
              right += getRightPaddingOffset();
              bottom += getBottomPaddingOffset();
          }
  
          final ScrollabilityCache scrollabilityCache = mScrollCache;
          final float fadeHeight = scrollabilityCache.fadingEdgeLength;
          int length = (int) fadeHeight;
  
          // clip the fade length if top and bottom fades overlap
          // overlapping fades produce odd-looking artifacts
          if (verticalEdges && (top + length > bottom - length)) {
              length = (bottom - top) / 2;
          }
  
          // also clip horizontal fades if necessary
          if (horizontalEdges && (left + length > right - length)) {
              length = (right - left) / 2;
          }
  
          if (verticalEdges) {
              topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength()));
              drawTop = topFadeStrength * fadeHeight > 1.0f;
              bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength()));
              drawBottom = bottomFadeStrength * fadeHeight > 1.0f;
          }
  
          if (horizontalEdges) {
              leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength()));
              drawLeft = leftFadeStrength * fadeHeight > 1.0f;
              rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength()));
              drawRight = rightFadeStrength * fadeHeight > 1.0f;
          }
  
          saveCount = canvas.getSaveCount();
          int topSaveCount = -1;
          int bottomSaveCount = -1;
          int leftSaveCount = -1;
          int rightSaveCount = -1;
  
          int solidColor = getSolidColor();
          if (solidColor == 0) {
              if (drawTop) {
                  topSaveCount = canvas.saveUnclippedLayer(left, top, right, top + length);
              }
  
              if (drawBottom) {
                  bottomSaveCount = canvas.saveUnclippedLayer(left, bottom - length, right, bottom);
              }
  
              if (drawLeft) {
                  leftSaveCount = canvas.saveUnclippedLayer(left, top, left + length, bottom);
              }
  
              if (drawRight) {
                  rightSaveCount = canvas.saveUnclippedLayer(right - length, top, right, bottom);
              }
          } else {
              scrollabilityCache.setFadeColor(solidColor);
          }
  
          // Step 3, draw the content
          onDraw(canvas);
  
          // Step 4, draw the children
          dispatchDraw(canvas);
  
          // Step 5, draw the fade effect and restore layers
          final Paint p = scrollabilityCache.paint;
          final Matrix matrix = scrollabilityCache.matrix;
          final Shader fade = scrollabilityCache.shader;
  
          // must be restored in the reverse order that they were saved
          if (drawRight) {
              matrix.setScale(1, fadeHeight * rightFadeStrength);
              matrix.postRotate(90);
              matrix.postTranslate(right, top);
              fade.setLocalMatrix(matrix);
              p.setShader(fade);
              if (solidColor == 0) {
                  canvas.restoreUnclippedLayer(rightSaveCount, p);
  
              } else {
                  canvas.drawRect(right - length, top, right, bottom, p);
              }
          }
  
          if (drawLeft) {
              matrix.setScale(1, fadeHeight * leftFadeStrength);
              matrix.postRotate(-90);
              matrix.postTranslate(left, top);
              fade.setLocalMatrix(matrix);
              p.setShader(fade);
              if (solidColor == 0) {
                  canvas.restoreUnclippedLayer(leftSaveCount, p);
              } else {
                  canvas.drawRect(left, top, left + length, bottom, p);
              }
          }
  
          if (drawBottom) {
              matrix.setScale(1, fadeHeight * bottomFadeStrength);
              matrix.postRotate(180);
              matrix.postTranslate(left, bottom);
              fade.setLocalMatrix(matrix);
              p.setShader(fade);
              if (solidColor == 0) {
                  canvas.restoreUnclippedLayer(bottomSaveCount, p);
              } else {
                  canvas.drawRect(left, bottom - length, right, bottom, p);
              }
          }
  
          if (drawTop) {
              matrix.setScale(1, fadeHeight * topFadeStrength);
              matrix.postTranslate(left, top);
              fade.setLocalMatrix(matrix);
              p.setShader(fade);
              if (solidColor == 0) {
                  canvas.restoreUnclippedLayer(topSaveCount, p);
              } else {
                  canvas.drawRect(left, top, right, top + length, p);
              }
          }
  
          canvas.restoreToCount(saveCount);
  
          drawAutofilledHighlight(canvas);
  
          // Overlay is part of the content and draws beneath Foreground
          if (mOverlay != null && !mOverlay.isEmpty()) {
              mOverlay.getOverlayView().dispatchDraw(canvas);
          }
  
          // Step 6, draw decorations (foreground, scrollbars)
          onDrawForeground(canvas);
  
          if (debugDraw()) {
              debugDrawFocus(canvas);
          }
      }
  
      /**
       * Draws the background onto the specified canvas.
       *
       * @param canvas Canvas on which to draw the background
       */
      @UnsupportedAppUsage
      private void drawBackground(Canvas canvas) {
          final Drawable background = mBackground;
          if (background == null) {
              return;
          }
  
          setBackgroundBounds();
  
          // Attempt to use a display list if requested.
          if (canvas.isHardwareAccelerated() && mAttachInfo != null
                  && mAttachInfo.mThreadedRenderer != null) {
              mBackgroundRenderNode = getDrawableRenderNode(background, mBackgroundRenderNode);
  
              final RenderNode renderNode = mBackgroundRenderNode;
              if (renderNode != null && renderNode.hasDisplayList()) {
                  setBackgroundRenderNodeProperties(renderNode);
                  ((RecordingCanvas) canvas).drawRenderNode(renderNode);
                  return;
              }
          }
  
          final int scrollX = mScrollX;
          final int scrollY = mScrollY;
          if ((scrollX | scrollY) == 0) {
              background.draw(canvas);
          } else {
              canvas.translate(scrollX, scrollY);
              background.draw(canvas);
              canvas.translate(-scrollX, -scrollY);
          }
      }
  
      /**
       * Sets the correct background bounds and rebuilds the outline, if needed.
       * <p/>
       * This is called by LayoutLib.
       */
      void setBackgroundBounds() {
          if (mBackgroundSizeChanged && mBackground != null) {
              mBackground.setBounds(0, 0, mRight - mLeft, mBottom - mTop);
              mBackgroundSizeChanged = false;
              rebuildOutline();
          }
      }
  
      private void setBackgroundRenderNodeProperties(RenderNode renderNode) {
          renderNode.setTranslationX(mScrollX);
          renderNode.setTranslationY(mScrollY);
      }
  
      /**
       * Creates a new display list or updates the existing display list for the
       * specified Drawable.
       *
       * @param drawable Drawable for which to create a display list
       * @param renderNode Existing RenderNode, or {@code null}
       * @return A valid display list for the specified drawable
       */
      private RenderNode getDrawableRenderNode(Drawable drawable, RenderNode renderNode) {
          if (renderNode == null) {
              renderNode = RenderNode.create(drawable.getClass().getName(),
                      new ViewAnimationHostBridge(this));
              renderNode.setUsageHint(RenderNode.USAGE_BACKGROUND);
          }
  
          final Rect bounds = drawable.getBounds();
          final int width = bounds.width();
          final int height = bounds.height();
          final RecordingCanvas canvas = renderNode.beginRecording(width, height);
  
          // Reverse left/top translation done by drawable canvas, which will
          // instead be applied by rendernode's LTRB bounds below. This way, the
          // drawable's bounds match with its rendernode bounds and its content
          // will lie within those bounds in the rendernode tree.
          canvas.translate(-bounds.left, -bounds.top);
  
          try {
              drawable.draw(canvas);
          } finally {
              renderNode.endRecording();
          }
  
          // Set up drawable properties that are view-independent.
          renderNode.setLeftTopRightBottom(bounds.left, bounds.top, bounds.right, bounds.bottom);
          renderNode.setProjectBackwards(drawable.isProjected());
          renderNode.setProjectionReceiver(true);
          renderNode.setClipToBounds(false);
          return renderNode;
      }
  
      /**
       * Returns the overlay for this view, creating it if it does not yet exist.
       * Adding drawables to the overlay will cause them to be displayed whenever
       * the view itself is redrawn. Objects in the overlay should be actively
       * managed: remove them when they should not be displayed anymore. The
       * overlay will always have the same size as its host view.
       *
       * <p>Note: Overlays do not currently work correctly with {@link
       * SurfaceView} or {@link TextureView}; contents in overlays for these
       * types of views may not display correctly.</p>
       *
       * @return The ViewOverlay object for this view.
       * @see ViewOverlay
       */
      public ViewOverlay getOverlay() {
          if (mOverlay == null) {
              mOverlay = new ViewOverlay(mContext, this);
          }
          return mOverlay;
      }
  
      /**
       * Override this if your view is known to always be drawn on top of a solid color background,
       * and needs to draw fading edges. Returning a non-zero color enables the view system to
       * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha
       * should be set to 0xFF.
       *
       * @see #setVerticalFadingEdgeEnabled(boolean)
       * @see #setHorizontalFadingEdgeEnabled(boolean)
       *
       * @return The known solid color background for this view, or 0 if the color may vary
       */
      @ViewDebug.ExportedProperty(category = "drawing")
      @InspectableProperty
      @ColorInt
      public int getSolidColor() {
          return 0;
      }
  
      /**
       * Build a human readable string representation of the specified view flags.
       *
       * @param flags the view flags to convert to a string
       * @return a String representing the supplied flags
       */
      private static String printFlags(int flags) {
          String output = "";
          int numFlags = 0;
          if ((flags & FOCUSABLE) == FOCUSABLE) {
              output += "TAKES_FOCUS";
              numFlags++;
          }
  
          switch (flags & VISIBILITY_MASK) {
          case INVISIBLE:
              if (numFlags > 0) {
                  output += " ";
              }
              output += "INVISIBLE";
              // USELESS HERE numFlags++;
              break;
          case GONE:
              if (numFlags > 0) {
                  output += " ";
              }
              output += "GONE";
              // USELESS HERE numFlags++;
              break;
          default:
              break;
          }
          return output;
      }
  
      /**
       * Build a human readable string representation of the specified private
       * view flags.
       *
       * @param privateFlags the private view flags to convert to a string
       * @return a String representing the supplied flags
       */
      private static String printPrivateFlags(int privateFlags) {
          String output = "";
          int numFlags = 0;
  
          if ((privateFlags & PFLAG_WANTS_FOCUS) == PFLAG_WANTS_FOCUS) {
              output += "WANTS_FOCUS";
              numFlags++;
          }
  
          if ((privateFlags & PFLAG_FOCUSED) == PFLAG_FOCUSED) {
              if (numFlags > 0) {
                  output += " ";
              }
              output += "FOCUSED";
              numFlags++;
          }
  
          if ((privateFlags & PFLAG_SELECTED) == PFLAG_SELECTED) {
              if (numFlags > 0) {
                  output += " ";
              }
              output += "SELECTED";
              numFlags++;
          }
  
          if ((privateFlags & PFLAG_IS_ROOT_NAMESPACE) == PFLAG_IS_ROOT_NAMESPACE) {
              if (numFlags > 0) {
                  output += " ";
              }
              output += "IS_ROOT_NAMESPACE";
              numFlags++;
          }
  
          if ((privateFlags & PFLAG_HAS_BOUNDS) == PFLAG_HAS_BOUNDS) {
              if (numFlags > 0) {
                  output += " ";
              }
              output += "HAS_BOUNDS";
              numFlags++;
          }
  
          if ((privateFlags & PFLAG_DRAWN) == PFLAG_DRAWN) {
              if (numFlags > 0) {
                  output += " ";
              }
              output += "DRAWN";
              // USELESS HERE numFlags++;
          }
          return output;
      }
  
      /**
       * <p>Indicates whether or not this view's layout will be requested during
       * the next hierarchy layout pass.</p>
       *
       * @return true if the layout will be forced during next layout pass
       */
      public boolean isLayoutRequested() {
          return (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT;
      }
  
      /**
       * Return true if o is a ViewGroup that is laying out using optical bounds.
       * @hide
       */
      public static boolean isLayoutModeOptical(Object o) {
          return o instanceof ViewGroup && ((ViewGroup) o).isLayoutModeOptical();
      }
  
      private boolean setOpticalFrame(int left, int top, int right, int bottom) {
          Insets parentInsets = mParent instanceof View ?
                  ((View) mParent).getOpticalInsets() : Insets.NONE;
          Insets childInsets = getOpticalInsets();
          return setFrame(
                  left   + parentInsets.left - childInsets.left,
                  top    + parentInsets.top  - childInsets.top,
                  right  + parentInsets.left + childInsets.right,
                  bottom + parentInsets.top  + childInsets.bottom);
      }
  
      /**
       * Assign a size and position to a view and all of its
       * descendants
       *
       * <p>This is the second phase of the layout mechanism.
       * (The first is measuring). In this phase, each parent calls
       * layout on all of its children to position them.
       * This is typically done using the child measurements
       * that were stored in the measure pass().</p>
       *
       * <p>Derived classes should not override this method.
       * Derived classes with children should override
       * onLayout. In that method, they should
       * call layout on each of their children.</p>
       *
       * @param l Left position, relative to parent
       * @param t Top position, relative to parent
       * @param r Right position, relative to parent
       * @param b Bottom position, relative to parent
       */
      @SuppressWarnings({"unchecked"})
      public void layout(int l, int t, int r, int b) {
          if ((mPrivateFlags3 & PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT) != 0) {
              onMeasure(mOldWidthMeasureSpec, mOldHeightMeasureSpec);
              mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT;
          }
  
          int oldL = mLeft;
          int oldT = mTop;
          int oldB = mBottom;
          int oldR = mRight;
  
          boolean changed = isLayoutModeOptical(mParent) ?
                  setOpticalFrame(l, t, r, b) : setFrame(l, t, r, b);
  
          if (changed || (mPrivateFlags & PFLAG_LAYOUT_REQUIRED) == PFLAG_LAYOUT_REQUIRED) {
              onLayout(changed, l, t, r, b);
  
              if (shouldDrawRoundScrollbar()) {
                  if(mRoundScrollbarRenderer == null) {
                      mRoundScrollbarRenderer = new RoundScrollbarRenderer(this);
                  }
              } else {
                  mRoundScrollbarRenderer = null;
              }
  
              mPrivateFlags &= ~PFLAG_LAYOUT_REQUIRED;
  
              ListenerInfo li = mListenerInfo;
              if (li != null && li.mOnLayoutChangeListeners != null) {
                  ArrayList<OnLayoutChangeListener> listenersCopy =
                          (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone();
                  int numListeners = listenersCopy.size();
                  for (int i = 0; i < numListeners; ++i) {
                      listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB);
                  }
              }
          }
  
          final boolean wasLayoutValid = isLayoutValid();
  
          mPrivateFlags &= ~PFLAG_FORCE_LAYOUT;
          mPrivateFlags3 |= PFLAG3_IS_LAID_OUT;
  
          if (!wasLayoutValid && isFocused()) {
              mPrivateFlags &= ~PFLAG_WANTS_FOCUS;
              if (canTakeFocus()) {
                  // We have a robust focus, so parents should no longer be wanting focus.
                  clearParentsWantFocus();
              } else if (getViewRootImpl() == null || !getViewRootImpl().isInLayout()) {
                  // This is a weird case. Most-likely the user, rather than ViewRootImpl, called
                  // layout. In this case, there's no guarantee that parent layouts will be evaluated
                  // and thus the safest action is to clear focus here.
                  clearFocusInternal(null, /* propagate */ true, /* refocus */ false);
                  clearParentsWantFocus();
              } else if (!hasParentWantsFocus()) {
                  // original requestFocus was likely on this view directly, so just clear focus
                  clearFocusInternal(null, /* propagate */ true, /* refocus */ false);
              }
              // otherwise, we let parents handle re-assigning focus during their layout passes.
          } else if ((mPrivateFlags & PFLAG_WANTS_FOCUS) != 0) {
              mPrivateFlags &= ~PFLAG_WANTS_FOCUS;
              View focused = findFocus();
              if (focused != null) {
                  // Try to restore focus as close as possible to our starting focus.
                  if (!restoreDefaultFocus() && !hasParentWantsFocus()) {
                      // Give up and clear focus once we've reached the top-most parent which wants
                      // focus.
                      focused.clearFocusInternal(null, /* propagate */ true, /* refocus */ false);
                  }
              }
          }
  
          if ((mPrivateFlags3 & PFLAG3_NOTIFY_AUTOFILL_ENTER_ON_LAYOUT) != 0) {
              mPrivateFlags3 &= ~PFLAG3_NOTIFY_AUTOFILL_ENTER_ON_LAYOUT;
              notifyEnterOrExitForAutoFillIfNeeded(true);
          }
  
          notifyAppearedOrDisappearedForContentCaptureIfNeeded(true);
      }
  
      private boolean hasParentWantsFocus() {
          ViewParent parent = mParent;
          while (parent instanceof ViewGroup) {
              ViewGroup pv = (ViewGroup) parent;
              if ((pv.mPrivateFlags & PFLAG_WANTS_FOCUS) != 0) {
                  return true;
              }
              parent = pv.mParent;
          }
          return false;
      }
  
      /**
       * Called from layout when this view should
       * assign a size and position to each of its children.
       *
       * Derived classes with children should override
       * this method and call layout on each of
       * their children.
       * @param changed This is a new size or position for this view
       * @param left Left position, relative to parent
       * @param top Top position, relative to parent
       * @param right Right position, relative to parent
       * @param bottom Bottom position, relative to parent
       */
      protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
      }
  
      /**
       * Assign a size and position to this view.
       *
       * This is called from layout.
       *
       * @param left Left position, relative to parent
       * @param top Top position, relative to parent
       * @param right Right position, relative to parent
       * @param bottom Bottom position, relative to parent
       * @return true if the new size and position are different than the
       *         previous ones
       * {@hide}
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
      protected boolean setFrame(int left, int top, int right, int bottom) {
          boolean changed = false;
  
          if (DBG) {
              Log.d(VIEW_LOG_TAG, this + " View.setFrame(" + left + "," + top + ","
                      + right + "," + bottom + ")");
          }
  
          if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) {
              changed = true;
  
              // Remember our drawn bit
              int drawn = mPrivateFlags & PFLAG_DRAWN;
  
              int oldWidth = mRight - mLeft;
              int oldHeight = mBottom - mTop;
              int newWidth = right - left;
              int newHeight = bottom - top;
              boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight);
  
              // Invalidate our old position
              invalidate(sizeChanged);
  
              mLeft = left;
              mTop = top;
              mRight = right;
              mBottom = bottom;
              mRenderNode.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom);
  
              mPrivateFlags |= PFLAG_HAS_BOUNDS;
  
  
              if (sizeChanged) {
                  sizeChange(newWidth, newHeight, oldWidth, oldHeight);
              }
  
              if ((mViewFlags & VISIBILITY_MASK) == VISIBLE || mGhostView != null) {
                  // If we are visible, force the DRAWN bit to on so that
                  // this invalidate will go through (at least to our parent).
                  // This is because someone may have invalidated this view
                  // before this call to setFrame came in, thereby clearing
                  // the DRAWN bit.
                  mPrivateFlags |= PFLAG_DRAWN;
                  invalidate(sizeChanged);
                  // parent display list may need to be recreated based on a change in the bounds
                  // of any child
                  invalidateParentCaches();
              }
  
              // Reset drawn bit to original value (invalidate turns it off)
              mPrivateFlags |= drawn;
  
              mBackgroundSizeChanged = true;
              mDefaultFocusHighlightSizeChanged = true;
              if (mForegroundInfo != null) {
                  mForegroundInfo.mBoundsChanged = true;
              }
  
              notifySubtreeAccessibilityStateChangedIfNeeded();
          }
          return changed;
      }
  
      /**
       * Assign a size and position to this view.
       *
       * This method is meant to be used in animations only as it applies this position and size
       * for the view only temporary and it can be changed back at any time by the layout.
       *
       * @param left Left position, relative to parent
       * @param top Top position, relative to parent
       * @param right Right position, relative to parent
       * @param bottom Bottom position, relative to parent
       *
       * @see #setLeft(int), #setRight(int), #setTop(int), #setBottom(int)
       */
      public final void setLeftTopRightBottom(int left, int top, int right, int bottom) {
          setFrame(left, top, right, bottom);
      }
  
      private void sizeChange(int newWidth, int newHeight, int oldWidth, int oldHeight) {
          onSizeChanged(newWidth, newHeight, oldWidth, oldHeight);
          if (mOverlay != null) {
              mOverlay.getOverlayView().setRight(newWidth);
              mOverlay.getOverlayView().setBottom(newHeight);
          }
          // If this isn't laid out yet, focus assignment will be handled during the "deferment/
          // backtracking" of requestFocus during layout, so don't touch focus here.
          if (!sCanFocusZeroSized && isLayoutValid()
                  // Don't touch focus if animating
                  && !(mParent instanceof ViewGroup && ((ViewGroup) mParent).isLayoutSuppressed())) {
              if (newWidth <= 0 || newHeight <= 0) {
                  if (hasFocus()) {
                      clearFocus();
                      if (mParent instanceof ViewGroup) {
                          ((ViewGroup) mParent).clearFocusedInCluster();
                      }
                  }
                  clearAccessibilityFocus();
              } else if (oldWidth <= 0 || oldHeight <= 0) {
                  if (mParent != null && canTakeFocus()) {
                      mParent.focusableViewAvailable(this);
                  }
              }
          }
          rebuildOutline();
      }
  
      /**
       * Finalize inflating a view from XML.  This is called as the last phase
       * of inflation, after all child views have been added.
       *
       * <p>Even if the subclass overrides onFinishInflate, they should always be
       * sure to call the super method, so that we get called.
       */
      @CallSuper
      protected void onFinishInflate() {
      }
  
      /**
       * Returns the resources associated with this view.
       *
       * @return Resources object.
       */
      public Resources getResources() {
          return mResources;
      }
  
      /**
       * Invalidates the specified Drawable.
       *
       * @param drawable the drawable to invalidate
       */
      @Override
      public void invalidateDrawable(@NonNull Drawable drawable) {
          if (verifyDrawable(drawable)) {
              final Rect dirty = drawable.getDirtyBounds();
              final int scrollX = mScrollX;
              final int scrollY = mScrollY;
  
              invalidate(dirty.left + scrollX, dirty.top + scrollY,
                      dirty.right + scrollX, dirty.bottom + scrollY);
              rebuildOutline();
          }
      }
  
      /**
       * Schedules an action on a drawable to occur at a specified time.
       *
       * @param who the recipient of the action
       * @param what the action to run on the drawable
       * @param when the time at which the action must occur. Uses the
       *        {@link SystemClock#uptimeMillis} timebase.
       */
      @Override
      public void scheduleDrawable(@NonNull Drawable who, @NonNull Runnable what, long when) {
          if (verifyDrawable(who) && what != null) {
              final long delay = when - SystemClock.uptimeMillis();
              if (mAttachInfo != null) {
                  mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed(
                          Choreographer.CALLBACK_ANIMATION, what, who,
                          Choreographer.subtractFrameDelay(delay));
              } else {
                  // Postpone the runnable until we know
                  // on which thread it needs to run.
                  getRunQueue().postDelayed(what, delay);
              }
          }
      }
  
      /**
       * Cancels a scheduled action on a drawable.
       *
       * @param who the recipient of the action
       * @param what the action to cancel
       */
      @Override
      public void unscheduleDrawable(@NonNull Drawable who, @NonNull Runnable what) {
          if (verifyDrawable(who) && what != null) {
              if (mAttachInfo != null) {
                  mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks(
                          Choreographer.CALLBACK_ANIMATION, what, who);
              }
              getRunQueue().removeCallbacks(what);
          }
      }
  
      /**
       * Unschedule any events associated with the given Drawable.  This can be
       * used when selecting a new Drawable into a view, so that the previous
       * one is completely unscheduled.
       *
       * @param who The Drawable to unschedule.
       *
       * @see #drawableStateChanged
       */
      public void unscheduleDrawable(Drawable who) {
          if (mAttachInfo != null && who != null) {
              mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks(
                      Choreographer.CALLBACK_ANIMATION, null, who);
          }
      }
  
      /**
       * Resolve the Drawables depending on the layout direction. This is implicitly supposing
       * that the View directionality can and will be resolved before its Drawables.
       *
       * Will call {@link View#onResolveDrawables} when resolution is done.
       *
       * @hide
       */
      protected void resolveDrawables() {
          // Drawables resolution may need to happen before resolving the layout direction (which is
          // done only during the measure() call).
          // If the layout direction is not resolved yet, we cannot resolve the Drawables except in
          // one case: when the raw layout direction has not been defined as LAYOUT_DIRECTION_INHERIT.
          // So, if the raw layout direction is LAYOUT_DIRECTION_LTR or LAYOUT_DIRECTION_RTL or
          // LAYOUT_DIRECTION_LOCALE, we can "cheat" and we don't need to wait for the layout
          // direction to be resolved as its resolved value will be the same as its raw value.
          if (!isLayoutDirectionResolved() &&
                  getRawLayoutDirection() == View.LAYOUT_DIRECTION_INHERIT) {
              return;
          }
  
          final int layoutDirection = isLayoutDirectionResolved() ?
                  getLayoutDirection() : getRawLayoutDirection();
  
          if (mBackground != null) {
              mBackground.setLayoutDirection(layoutDirection);
          }
          if (mForegroundInfo != null && mForegroundInfo.mDrawable != null) {
              mForegroundInfo.mDrawable.setLayoutDirection(layoutDirection);
          }
          if (mDefaultFocusHighlight != null) {
              mDefaultFocusHighlight.setLayoutDirection(layoutDirection);
          }
          mPrivateFlags2 |= PFLAG2_DRAWABLE_RESOLVED;
          onResolveDrawables(layoutDirection);
      }
  
      boolean areDrawablesResolved() {
          return (mPrivateFlags2 & PFLAG2_DRAWABLE_RESOLVED) == PFLAG2_DRAWABLE_RESOLVED;
      }
  
      /**
       * Called when layout direction has been resolved.
       *
       * The default implementation does nothing.
       *
       * @param layoutDirection The resolved layout direction.
       *
       * @see #LAYOUT_DIRECTION_LTR
       * @see #LAYOUT_DIRECTION_RTL
       *
       * @hide
       */
      public void onResolveDrawables(@ResolvedLayoutDir int layoutDirection) {
      }
  
      /**
       * @hide
       */
      @TestApi
      protected void resetResolvedDrawables() {
          resetResolvedDrawablesInternal();
      }
  
      void resetResolvedDrawablesInternal() {
          mPrivateFlags2 &= ~PFLAG2_DRAWABLE_RESOLVED;
      }
  
      /**
       * If your view subclass is displaying its own Drawable objects, it should
       * override this function and return true for any Drawable it is
       * displaying.  This allows animations for those drawables to be
       * scheduled.
       *
       * <p>Be sure to call through to the super class when overriding this
       * function.
       *
       * @param who The Drawable to verify.  Return true if it is one you are
       *            displaying, else return the result of calling through to the
       *            super class.
       *
       * @return boolean If true than the Drawable is being displayed in the
       *         view; else false and it is not allowed to animate.
       *
       * @see #unscheduleDrawable(android.graphics.drawable.Drawable)
       * @see #drawableStateChanged()
       */
      @CallSuper
      protected boolean verifyDrawable(@NonNull Drawable who) {
          // Avoid verifying the scroll bar drawable so that we don't end up in
          // an invalidation loop. This effectively prevents the scroll bar
          // drawable from triggering invalidations and scheduling runnables.
          return who == mBackground || (mForegroundInfo != null && mForegroundInfo.mDrawable == who)
                  || (mDefaultFocusHighlight == who);
      }
  
      /**
       * This function is called whenever the state of the view changes in such
       * a way that it impacts the state of drawables being shown.
       * <p>
       * If the View has a StateListAnimator, it will also be called to run necessary state
       * change animations.
       * <p>
       * Be sure to call through to the superclass when overriding this function.
       *
       * @see Drawable#setState(int[])
       */
      @CallSuper
      protected void drawableStateChanged() {
          final int[] state = getDrawableState();
          boolean changed = false;
  
          final Drawable bg = mBackground;
          if (bg != null && bg.isStateful()) {
              changed |= bg.setState(state);
          }
  
          final Drawable hl = mDefaultFocusHighlight;
          if (hl != null && hl.isStateful()) {
              changed |= hl.setState(state);
          }
  
          final Drawable fg = mForegroundInfo != null ? mForegroundInfo.mDrawable : null;
          if (fg != null && fg.isStateful()) {
              changed |= fg.setState(state);
          }
  
          if (mScrollCache != null) {
              final Drawable scrollBar = mScrollCache.scrollBar;
              if (scrollBar != null && scrollBar.isStateful()) {
                  changed |= scrollBar.setState(state)
                          && mScrollCache.state != ScrollabilityCache.OFF;
              }
          }
  
          if (mStateListAnimator != null) {
              mStateListAnimator.setState(state);
          }
  
          if (changed) {
              invalidate();
          }
      }
  
      /**
       * This function is called whenever the view hotspot changes and needs to
       * be propagated to drawables or child views managed by the view.
       * <p>
       * Dispatching to child views is handled by
       * {@link #dispatchDrawableHotspotChanged(float, float)}.
       * <p>
       * Be sure to call through to the superclass when overriding this function.
       *
       * @param x hotspot x coordinate
       * @param y hotspot y coordinate
       */
      @CallSuper
      public void drawableHotspotChanged(float x, float y) {
          if (mBackground != null) {
              mBackground.setHotspot(x, y);
          }
          if (mDefaultFocusHighlight != null) {
              mDefaultFocusHighlight.setHotspot(x, y);
          }
          if (mForegroundInfo != null && mForegroundInfo.mDrawable != null) {
              mForegroundInfo.mDrawable.setHotspot(x, y);
          }
  
          dispatchDrawableHotspotChanged(x, y);
      }
  
      /**
       * Dispatches drawableHotspotChanged to all of this View's children.
       *
       * @param x hotspot x coordinate
       * @param y hotspot y coordinate
       * @see #drawableHotspotChanged(float, float)
       */
      public void dispatchDrawableHotspotChanged(float x, float y) {
      }
  
      /**
       * Call this to force a view to update its drawable state. This will cause
       * drawableStateChanged to be called on this view. Views that are interested
       * in the new state should call getDrawableState.
       *
       * @see #drawableStateChanged
       * @see #getDrawableState
       */
      public void refreshDrawableState() {
          mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY;
          drawableStateChanged();
  
          ViewParent parent = mParent;
          if (parent != null) {
              parent.childDrawableStateChanged(this);
          }
      }
  
      /**
       * Create a default focus highlight if it doesn't exist.
       * @return a default focus highlight.
       */
      private Drawable getDefaultFocusHighlightDrawable() {
          if (mDefaultFocusHighlightCache == null) {
              if (mContext != null) {
                  final int[] attrs = new int[] { android.R.attr.selectableItemBackground };
                  final TypedArray ta = mContext.obtainStyledAttributes(attrs);
                  mDefaultFocusHighlightCache = ta.getDrawable(0);
                  ta.recycle();
              }
          }
          return mDefaultFocusHighlightCache;
      }
  
      /**
       * Set the current default focus highlight.
       * @param highlight the highlight drawable, or {@code null} if it's no longer needed.
       */
      private void setDefaultFocusHighlight(Drawable highlight) {
          mDefaultFocusHighlight = highlight;
          mDefaultFocusHighlightSizeChanged = true;
          if (highlight != null) {
              if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) {
                  mPrivateFlags &= ~PFLAG_SKIP_DRAW;
              }
              highlight.setLayoutDirection(getLayoutDirection());
              if (highlight.isStateful()) {
                  highlight.setState(getDrawableState());
              }
              if (isAttachedToWindow()) {
                  highlight.setVisible(getWindowVisibility() == VISIBLE && isShown(), false);
              }
              // Set callback last, since the view may still be initializing.
              highlight.setCallback(this);
          } else if ((mViewFlags & WILL_NOT_DRAW) != 0 && mBackground == null
                  && (mForegroundInfo == null || mForegroundInfo.mDrawable == null)) {
              mPrivateFlags |= PFLAG_SKIP_DRAW;
          }
          invalidate();
      }
  
      /**
       * Check whether we need to draw a default focus highlight when this view gets focused,
       * which requires:
       * <ul>
       *     <li>In both background and foreground, {@link android.R.attr#state_focused}
       *         is not defined.</li>
       *     <li>This view is not in touch mode.</li>
       *     <li>This view doesn't opt out for a default focus highlight, via
       *         {@link #setDefaultFocusHighlightEnabled(boolean)}.</li>
       *     <li>This view is attached to window.</li>
       * </ul>
       * @return {@code true} if a default focus highlight is needed.
       * @hide
       */
      @TestApi
      public boolean isDefaultFocusHighlightNeeded(Drawable background, Drawable foreground) {
          final boolean lackFocusState = (background == null || !background.isStateful()
                  || !background.hasFocusStateSpecified())
                  && (foreground == null || !foreground.isStateful()
                  || !foreground.hasFocusStateSpecified());
          return !isInTouchMode() && getDefaultFocusHighlightEnabled() && lackFocusState
                  && isAttachedToWindow() && sUseDefaultFocusHighlight;
      }
  
      /**
       * When this view is focused, switches on/off the default focused highlight.
       * <p>
       * This always happens when this view is focused, and only at this moment the default focus
       * highlight can be visible.
       */
      private void switchDefaultFocusHighlight() {
          if (isFocused()) {
              final boolean needed = isDefaultFocusHighlightNeeded(mBackground,
                      mForegroundInfo == null ? null : mForegroundInfo.mDrawable);
              final boolean active = mDefaultFocusHighlight != null;
              if (needed && !active) {
                  setDefaultFocusHighlight(getDefaultFocusHighlightDrawable());
              } else if (!needed && active) {
                  // The highlight is no longer needed, so tear it down.
                  setDefaultFocusHighlight(null);
              }
          }
      }
  
      /**
       * Draw the default focus highlight onto the canvas.
       * @param canvas the canvas where we're drawing the highlight.
       */
      private void drawDefaultFocusHighlight(Canvas canvas) {
          if (mDefaultFocusHighlight != null) {
              if (mDefaultFocusHighlightSizeChanged) {
                  mDefaultFocusHighlightSizeChanged = false;
                  final int l = mScrollX;
                  final int r = l + mRight - mLeft;
                  final int t = mScrollY;
                  final int b = t + mBottom - mTop;
                  mDefaultFocusHighlight.setBounds(l, t, r, b);
              }
              mDefaultFocusHighlight.draw(canvas);
          }
      }
  
      /**
       * Return an array of resource IDs of the drawable states representing the
       * current state of the view.
       *
       * @return The current drawable state
       *
       * @see Drawable#setState(int[])
       * @see #drawableStateChanged()
       * @see #onCreateDrawableState(int)
       */
      public final int[] getDrawableState() {
          if ((mDrawableState != null) && ((mPrivateFlags & PFLAG_DRAWABLE_STATE_DIRTY) == 0)) {
              return mDrawableState;
          } else {
              mDrawableState = onCreateDrawableState(0);
              mPrivateFlags &= ~PFLAG_DRAWABLE_STATE_DIRTY;
              return mDrawableState;
          }
      }
  
      /**
       * Generate the new {@link android.graphics.drawable.Drawable} state for
       * this view. This is called by the view
       * system when the cached Drawable state is determined to be invalid.  To
       * retrieve the current state, you should use {@link #getDrawableState}.
       *
       * @param extraSpace if non-zero, this is the number of extra entries you
       * would like in the returned array in which you can place your own
       * states.
       *
       * @return Returns an array holding the current {@link Drawable} state of
       * the view.
       *
       * @see #mergeDrawableStates(int[], int[])
       */
      protected int[] onCreateDrawableState(int extraSpace) {
          if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE &&
                  mParent instanceof View) {
              return ((View) mParent).onCreateDrawableState(extraSpace);
          }
  
          int[] drawableState;
  
          int privateFlags = mPrivateFlags;
  
          int viewStateIndex = 0;
          if ((privateFlags & PFLAG_PRESSED) != 0) viewStateIndex |= StateSet.VIEW_STATE_PRESSED;
          if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= StateSet.VIEW_STATE_ENABLED;
          if (isFocused()) viewStateIndex |= StateSet.VIEW_STATE_FOCUSED;
          if ((privateFlags & PFLAG_SELECTED) != 0) viewStateIndex |= StateSet.VIEW_STATE_SELECTED;
          if (hasWindowFocus()) viewStateIndex |= StateSet.VIEW_STATE_WINDOW_FOCUSED;
          if ((privateFlags & PFLAG_ACTIVATED) != 0) viewStateIndex |= StateSet.VIEW_STATE_ACTIVATED;
          if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested &&
                  ThreadedRenderer.isAvailable()) {
              // This is set if HW acceleration is requested, even if the current
              // process doesn't allow it.  This is just to allow app preview
              // windows to better match their app.
              viewStateIndex |= StateSet.VIEW_STATE_ACCELERATED;
          }
          if ((privateFlags & PFLAG_HOVERED) != 0) viewStateIndex |= StateSet.VIEW_STATE_HOVERED;
  
          final int privateFlags2 = mPrivateFlags2;
          if ((privateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0) {
              viewStateIndex |= StateSet.VIEW_STATE_DRAG_CAN_ACCEPT;
          }
          if ((privateFlags2 & PFLAG2_DRAG_HOVERED) != 0) {
              viewStateIndex |= StateSet.VIEW_STATE_DRAG_HOVERED;
          }
  
          drawableState = StateSet.get(viewStateIndex);
  
          //noinspection ConstantIfStatement
          if (false) {
              Log.i("View", "drawableStateIndex=" + viewStateIndex);
              Log.i("View", toString()
                      + " pressed=" + ((privateFlags & PFLAG_PRESSED) != 0)
                      + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED)
                      + " fo=" + hasFocus()
                      + " sl=" + ((privateFlags & PFLAG_SELECTED) != 0)
                      + " wf=" + hasWindowFocus()
                      + ": " + Arrays.toString(drawableState));
          }
  
          if (extraSpace == 0) {
              return drawableState;
          }
  
          final int[] fullState;
          if (drawableState != null) {
              fullState = new int[drawableState.length + extraSpace];
              System.arraycopy(drawableState, 0, fullState, 0, drawableState.length);
          } else {
              fullState = new int[extraSpace];
          }
  
          return fullState;
      }
  
      /**
       * Merge your own state values in <var>additionalState</var> into the base
       * state values <var>baseState</var> that were returned by
       * {@link #onCreateDrawableState(int)}.
       *
       * @param baseState The base state values returned by
       * {@link #onCreateDrawableState(int)}, which will be modified to also hold your
       * own additional state values.
       *
       * @param additionalState The additional state values you would like
       * added to <var>baseState</var>; this array is not modified.
       *
       * @return As a convenience, the <var>baseState</var> array you originally
       * passed into the function is returned.
       *
       * @see #onCreateDrawableState(int)
       */
      protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) {
          final int N = baseState.length;
          int i = N - 1;
          while (i >= 0 && baseState[i] == 0) {
              i--;
          }
          System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length);
          return baseState;
      }
  
      /**
       * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()}
       * on all Drawable objects associated with this view.
       * <p>
       * Also calls {@link StateListAnimator#jumpToCurrentState()} if there is a StateListAnimator
       * attached to this view.
       */
      @CallSuper
      public void jumpDrawablesToCurrentState() {
          if (mBackground != null) {
              mBackground.jumpToCurrentState();
          }
          if (mStateListAnimator != null) {
              mStateListAnimator.jumpToCurrentState();
          }
          if (mDefaultFocusHighlight != null) {
              mDefaultFocusHighlight.jumpToCurrentState();
          }
          if (mForegroundInfo != null && mForegroundInfo.mDrawable != null) {
              mForegroundInfo.mDrawable.jumpToCurrentState();
          }
      }
  
      /**
       * Sets the background color for this view.
       * @param color the color of the background
       */
      @RemotableViewMethod
      public void setBackgroundColor(@ColorInt int color) {
          if (mBackground instanceof ColorDrawable) {
              ((ColorDrawable) mBackground.mutate()).setColor(color);
              computeOpaqueFlags();
              mBackgroundResource = 0;
          } else {
              setBackground(new ColorDrawable(color));
          }
      }
  
      /**
       * Set the background to a given resource. The resource should refer to
       * a Drawable object or 0 to remove the background.
       * @param resid The identifier of the resource.
       *
       * @attr ref android.R.styleable#View_background
       */
      @RemotableViewMethod
      public void setBackgroundResource(@DrawableRes int resid) {
          if (resid != 0 && resid == mBackgroundResource) {
              return;
          }
  
          Drawable d = null;
          if (resid != 0) {
              d = mContext.getDrawable(resid);
          }
          setBackground(d);
  
          mBackgroundResource = resid;
      }
  
      /**
       * Set the background to a given Drawable, or remove the background. If the
       * background has padding, this View's padding is set to the background's
       * padding. However, when a background is removed, this View's padding isn't
       * touched. If setting the padding is desired, please use
       * {@link #setPadding(int, int, int, int)}.
       *
       * @param background The Drawable to use as the background, or null to remove the
       *        background
       */
      public void setBackground(Drawable background) {
          //noinspection deprecation
          setBackgroundDrawable(background);
      }
  
      /**
       * @deprecated use {@link #setBackground(Drawable)} instead
       */
      @Deprecated
      public void setBackgroundDrawable(Drawable background) {
          computeOpaqueFlags();
  
          if (background == mBackground) {
              return;
          }
  
          boolean requestLayout = false;
  
          mBackgroundResource = 0;
  
          /*
           * Regardless of whether we're setting a new background or not, we want
           * to clear the previous drawable. setVisible first while we still have the callback set.
           */
          if (mBackground != null) {
              if (isAttachedToWindow()) {
                  mBackground.setVisible(false, false);
              }
              mBackground.setCallback(null);
              unscheduleDrawable(mBackground);
          }
  
          if (background != null) {
              Rect padding = sThreadLocal.get();
              if (padding == null) {
                  padding = new Rect();
                  sThreadLocal.set(padding);
              }
              resetResolvedDrawablesInternal();
              background.setLayoutDirection(getLayoutDirection());
              if (background.getPadding(padding)) {
                  resetResolvedPaddingInternal();
                  switch (background.getLayoutDirection()) {
                      case LAYOUT_DIRECTION_RTL:
                          mUserPaddingLeftInitial = padding.right;
                          mUserPaddingRightInitial = padding.left;
                          internalSetPadding(padding.right, padding.top, padding.left, padding.bottom);
                          break;
                      case LAYOUT_DIRECTION_LTR:
                      default:
                          mUserPaddingLeftInitial = padding.left;
                          mUserPaddingRightInitial = padding.right;
                          internalSetPadding(padding.left, padding.top, padding.right, padding.bottom);
                  }
                  mLeftPaddingDefined = false;
                  mRightPaddingDefined = false;
              }
  
              // Compare the minimum sizes of the old Drawable and the new.  If there isn't an old or
              // if it has a different minimum size, we should layout again
              if (mBackground == null
                      || mBackground.getMinimumHeight() != background.getMinimumHeight()
                      || mBackground.getMinimumWidth() != background.getMinimumWidth()) {
                  requestLayout = true;
              }
  
              // Set mBackground before we set this as the callback and start making other
              // background drawable state change calls. In particular, the setVisible call below
              // can result in drawables attempting to start animations or otherwise invalidate,
              // which requires the view set as the callback (us) to recognize the drawable as
              // belonging to it as per verifyDrawable.
              mBackground = background;
              if (background.isStateful()) {
                  background.setState(getDrawableState());
              }
              if (isAttachedToWindow()) {
                  background.setVisible(getWindowVisibility() == VISIBLE && isShown(), false);
              }
  
              applyBackgroundTint();
  
              // Set callback last, since the view may still be initializing.
              background.setCallback(this);
  
              if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) {
                  mPrivateFlags &= ~PFLAG_SKIP_DRAW;
                  requestLayout = true;
              }
          } else {
              /* Remove the background */
              mBackground = null;
              if ((mViewFlags & WILL_NOT_DRAW) != 0
                      && (mDefaultFocusHighlight == null)
                      && (mForegroundInfo == null || mForegroundInfo.mDrawable == null)) {
                  mPrivateFlags |= PFLAG_SKIP_DRAW;
              }
  
              /*
               * When the background is set, we try to apply its padding to this
               * View. When the background is removed, we don't touch this View's
               * padding. This is noted in the Javadocs. Hence, we don't need to
               * requestLayout(), the invalidate() below is sufficient.
               */
  
              // The old background's minimum size could have affected this
              // View's layout, so let's requestLayout
              requestLayout = true;
          }
  
          computeOpaqueFlags();
  
          if (requestLayout) {
              requestLayout();
          }
  
          mBackgroundSizeChanged = true;
          invalidate(true);
          invalidateOutline();
      }
  
      /**
       * Gets the background drawable
       *
       * @return The drawable used as the background for this view, if any.
       *
       * @see #setBackground(Drawable)
       *
       * @attr ref android.R.styleable#View_background
       */
      @InspectableProperty
      public Drawable getBackground() {
          return mBackground;
      }
  
      /**
       * Applies a tint to the background drawable. Does not modify the current tint
       * mode, which is {@link BlendMode#SRC_IN} by default.
       * <p>
       * Subsequent calls to {@link #setBackground(Drawable)} will automatically
       * mutate the drawable and apply the specified tint and tint mode using
       * {@link Drawable#setTintList(ColorStateList)}.
       *
       * @param tint the tint to apply, may be {@code null} to clear tint
       *
       * @attr ref android.R.styleable#View_backgroundTint
       * @see #getBackgroundTintList()
       * @see Drawable#setTintList(ColorStateList)
       */
      public void setBackgroundTintList(@Nullable ColorStateList tint) {
          if (mBackgroundTint == null) {
              mBackgroundTint = new TintInfo();
          }
          mBackgroundTint.mTintList = tint;
          mBackgroundTint.mHasTintList = true;
  
          applyBackgroundTint();
      }
  
      /**
       * Return the tint applied to the background drawable, if specified.
       *
       * @return the tint applied to the background drawable
       * @attr ref android.R.styleable#View_backgroundTint
       * @see #setBackgroundTintList(ColorStateList)
       */
      @InspectableProperty(name = "backgroundTint")
      @Nullable
      public ColorStateList getBackgroundTintList() {
          return mBackgroundTint != null ? mBackgroundTint.mTintList : null;
      }
  
      /**
       * Specifies the blending mode used to apply the tint specified by
       * {@link #setBackgroundTintList(ColorStateList)}} to the background
       * drawable. The default mode is {@link PorterDuff.Mode#SRC_IN}.
       *
       * @param tintMode the blending mode used to apply the tint, may be
       *                 {@code null} to clear tint
       * @attr ref android.R.styleable#View_backgroundTintMode
       * @see #getBackgroundTintMode()
       * @see Drawable#setTintMode(PorterDuff.Mode)
       */
      public void setBackgroundTintMode(@Nullable PorterDuff.Mode tintMode) {
          BlendMode mode = null;
          if (tintMode != null) {
              mode = BlendMode.fromValue(tintMode.nativeInt);
          }
  
          setBackgroundTintBlendMode(mode);
      }
  
      /**
       * Specifies the blending mode used to apply the tint specified by
       * {@link #setBackgroundTintList(ColorStateList)}} to the background
       * drawable. The default mode is {@link BlendMode#SRC_IN}.
       *
       * @param blendMode the blending mode used to apply the tint, may be
       *                 {@code null} to clear tint
       * @attr ref android.R.styleable#View_backgroundTintMode
       * @see #getBackgroundTintMode()
       * @see Drawable#setTintBlendMode(BlendMode)
       */
      public void setBackgroundTintBlendMode(@Nullable BlendMode blendMode) {
          if (mBackgroundTint == null) {
              mBackgroundTint = new TintInfo();
          }
  
          mBackgroundTint.mBlendMode = blendMode;
          mBackgroundTint.mHasTintMode = true;
  
          applyBackgroundTint();
      }
  
      /**
       * Return the blending mode used to apply the tint to the background
       * drawable, if specified.
       *
       * @return the blending mode used to apply the tint to the background
       *         drawable
       * @attr ref android.R.styleable#View_backgroundTintMode
       * @see #setBackgroundTintBlendMode(BlendMode)
       *
       */
      @Nullable
      @InspectableProperty
      public PorterDuff.Mode getBackgroundTintMode() {
          PorterDuff.Mode porterDuffMode;
          if (mBackgroundTint != null && mBackgroundTint.mBlendMode != null) {
              porterDuffMode = BlendMode.blendModeToPorterDuffMode(mBackgroundTint.mBlendMode);
          } else {
              porterDuffMode = null;
          }
          return porterDuffMode;
      }
  
      /**
       * Return the blending mode used to apply the tint to the background
       * drawable, if specified.
       *
       * @return the blending mode used to apply the tint to the background
       *         drawable, null if no blend has previously been configured
       * @attr ref android.R.styleable#View_backgroundTintMode
       * @see #setBackgroundTintBlendMode(BlendMode)
       */
      public @Nullable BlendMode getBackgroundTintBlendMode() {
          return mBackgroundTint != null ? mBackgroundTint.mBlendMode : null;
      }
  
      private void applyBackgroundTint() {
          if (mBackground != null && mBackgroundTint != null) {
              final TintInfo tintInfo = mBackgroundTint;
              if (tintInfo.mHasTintList || tintInfo.mHasTintMode) {
                  mBackground = mBackground.mutate();
  
                  if (tintInfo.mHasTintList) {
                      mBackground.setTintList(tintInfo.mTintList);
                  }
  
                  if (tintInfo.mHasTintMode) {
                      mBackground.setTintBlendMode(tintInfo.mBlendMode);
                  }
  
                  // The drawable (or one of its children) may not have been
                  // stateful before applying the tint, so let's try again.
                  if (mBackground.isStateful()) {
                      mBackground.setState(getDrawableState());
                  }
              }
          }
      }
  
      /**
       * Returns the drawable used as the foreground of this View. The
       * foreground drawable, if non-null, is always drawn on top of the view's content.
       *
       * @return a Drawable or null if no foreground was set
       *
       * @see #onDrawForeground(Canvas)
       */
      @InspectableProperty
      public Drawable getForeground() {
          return mForegroundInfo != null ? mForegroundInfo.mDrawable : null;
      }
  
      /**
       * Supply a Drawable that is to be rendered on top of all of the content in the view.
       *
       * @param foreground the Drawable to be drawn on top of the children
       *
       * @attr ref android.R.styleable#View_foreground
       */
      public void setForeground(Drawable foreground) {
          if (mForegroundInfo == null) {
              if (foreground == null) {
                  // Nothing to do.
                  return;
              }
              mForegroundInfo = new ForegroundInfo();
          }
  
          if (foreground == mForegroundInfo.mDrawable) {
              // Nothing to do
              return;
          }
  
          if (mForegroundInfo.mDrawable != null) {
              if (isAttachedToWindow()) {
                  mForegroundInfo.mDrawable.setVisible(false, false);
              }
              mForegroundInfo.mDrawable.setCallback(null);
              unscheduleDrawable(mForegroundInfo.mDrawable);
          }
  
          mForegroundInfo.mDrawable = foreground;
          mForegroundInfo.mBoundsChanged = true;
          if (foreground != null) {
              if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) {
                  mPrivateFlags &= ~PFLAG_SKIP_DRAW;
              }
              foreground.setLayoutDirection(getLayoutDirection());
              if (foreground.isStateful()) {
                  foreground.setState(getDrawableState());
              }
              applyForegroundTint();
              if (isAttachedToWindow()) {
                  foreground.setVisible(getWindowVisibility() == VISIBLE && isShown(), false);
              }
              // Set callback last, since the view may still be initializing.
              foreground.setCallback(this);
          } else if ((mViewFlags & WILL_NOT_DRAW) != 0 && mBackground == null
                  && (mDefaultFocusHighlight == null)) {
              mPrivateFlags |= PFLAG_SKIP_DRAW;
          }
          requestLayout();
          invalidate();
      }
  
      /**
       * Magic bit used to support features of framework-internal window decor implementation details.
       * This used to live exclusively in FrameLayout.
       *
       * @return true if the foreground should draw inside the padding region or false
       *         if it should draw inset by the view's padding
       * @hide internal use only; only used by FrameLayout and internal screen layouts.
       */
      public boolean isForegroundInsidePadding() {
          return mForegroundInfo != null ? mForegroundInfo.mInsidePadding : true;
      }
  
      /**
       * Describes how the foreground is positioned.
       *
       * @return foreground gravity.
       *
       * @see #setForegroundGravity(int)
       *
       * @attr ref android.R.styleable#View_foregroundGravity
       */
      @InspectableProperty(valueType = InspectableProperty.ValueType.GRAVITY)
      public int getForegroundGravity() {
          return mForegroundInfo != null ? mForegroundInfo.mGravity
                  : Gravity.START | Gravity.TOP;
      }
  
      /**
       * Describes how the foreground is positioned. Defaults to START and TOP.
       *
       * @param gravity see {@link android.view.Gravity}
       *
       * @see #getForegroundGravity()
       *
       * @attr ref android.R.styleable#View_foregroundGravity
       */
      public void setForegroundGravity(int gravity) {
          if (mForegroundInfo == null) {
              mForegroundInfo = new ForegroundInfo();
          }
  
          if (mForegroundInfo.mGravity != gravity) {
              if ((gravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK) == 0) {
                  gravity |= Gravity.START;
              }
  
              if ((gravity & Gravity.VERTICAL_GRAVITY_MASK) == 0) {
                  gravity |= Gravity.TOP;
              }
  
              mForegroundInfo.mGravity = gravity;
              requestLayout();
          }
      }
  
      /**
       * Applies a tint to the foreground drawable. Does not modify the current tint
       * mode, which is {@link PorterDuff.Mode#SRC_IN} by default.
       * <p>
       * Subsequent calls to {@link #setForeground(Drawable)} will automatically
       * mutate the drawable and apply the specified tint and tint mode using
       * {@link Drawable#setTintList(ColorStateList)}.
       *
       * @param tint the tint to apply, may be {@code null} to clear tint
       *
       * @attr ref android.R.styleable#View_foregroundTint
       * @see #getForegroundTintList()
       * @see Drawable#setTintList(ColorStateList)
       */
      public void setForegroundTintList(@Nullable ColorStateList tint) {
          if (mForegroundInfo == null) {
              mForegroundInfo = new ForegroundInfo();
          }
          if (mForegroundInfo.mTintInfo == null) {
              mForegroundInfo.mTintInfo = new TintInfo();
          }
          mForegroundInfo.mTintInfo.mTintList = tint;
          mForegroundInfo.mTintInfo.mHasTintList = true;
  
          applyForegroundTint();
      }
  
      /**
       * Return the tint applied to the foreground drawable, if specified.
       *
       * @return the tint applied to the foreground drawable
       * @attr ref android.R.styleable#View_foregroundTint
       * @see #setForegroundTintList(ColorStateList)
       */
      @InspectableProperty(name = "foregroundTint")
      @Nullable
      public ColorStateList getForegroundTintList() {
          return mForegroundInfo != null && mForegroundInfo.mTintInfo != null
                  ? mForegroundInfo.mTintInfo.mTintList : null;
      }
  
      /**
       * Specifies the blending mode used to apply the tint specified by
       * {@link #setForegroundTintList(ColorStateList)}} to the background
       * drawable. The default mode is {@link PorterDuff.Mode#SRC_IN}.
       *
       * @param tintMode the blending mode used to apply the tint, may be
       *                 {@code null} to clear tint
       * @attr ref android.R.styleable#View_foregroundTintMode
       * @see #getForegroundTintMode()
       * @see Drawable#setTintMode(PorterDuff.Mode)
       *
       */
      public void setForegroundTintMode(@Nullable PorterDuff.Mode tintMode) {
          BlendMode mode = null;
          if (tintMode != null) {
              mode = BlendMode.fromValue(tintMode.nativeInt);
          }
          setForegroundTintBlendMode(mode);
      }
  
      /**
       * Specifies the blending mode used to apply the tint specified by
       * {@link #setForegroundTintList(ColorStateList)}} to the background
       * drawable. The default mode is {@link BlendMode#SRC_IN}.
       *
       * @param blendMode the blending mode used to apply the tint, may be
       *                 {@code null} to clear tint
       * @attr ref android.R.styleable#View_foregroundTintMode
       * @see #getForegroundTintMode()
       * @see Drawable#setTintBlendMode(BlendMode)
       */
      public void setForegroundTintBlendMode(@Nullable BlendMode blendMode) {
          if (mForegroundInfo == null) {
              mForegroundInfo = new ForegroundInfo();
          }
          if (mForegroundInfo.mTintInfo == null) {
              mForegroundInfo.mTintInfo = new TintInfo();
          }
          mForegroundInfo.mTintInfo.mBlendMode = blendMode;
          mForegroundInfo.mTintInfo.mHasTintMode = true;
  
          applyForegroundTint();
      }
  
      /**
       * Return the blending mode used to apply the tint to the foreground
       * drawable, if specified.
       *
       * @return the blending mode used to apply the tint to the foreground
       *         drawable
       * @attr ref android.R.styleable#View_foregroundTintMode
       * @see #setForegroundTintMode(PorterDuff.Mode)
       */
      @InspectableProperty
      @Nullable
      public PorterDuff.Mode getForegroundTintMode() {
          BlendMode blendMode = mForegroundInfo != null && mForegroundInfo.mTintInfo != null
                  ? mForegroundInfo.mTintInfo.mBlendMode : null;
          if (blendMode != null) {
              return BlendMode.blendModeToPorterDuffMode(blendMode);
          } else {
              return null;
          }
      }
  
      /**
       * Return the blending mode used to apply the tint to the foreground
       * drawable, if specified.
       *
       * @return the blending mode used to apply the tint to the foreground
       *         drawable
       * @attr ref android.R.styleable#View_foregroundTintMode
       * @see #setForegroundTintBlendMode(BlendMode)
       *
       */
      public @Nullable BlendMode getForegroundTintBlendMode() {
          return mForegroundInfo != null && mForegroundInfo.mTintInfo != null
                  ? mForegroundInfo.mTintInfo.mBlendMode : null;
      }
  
      private void applyForegroundTint() {
          if (mForegroundInfo != null && mForegroundInfo.mDrawable != null
                  && mForegroundInfo.mTintInfo != null) {
              final TintInfo tintInfo = mForegroundInfo.mTintInfo;
              if (tintInfo.mHasTintList || tintInfo.mHasTintMode) {
                  mForegroundInfo.mDrawable = mForegroundInfo.mDrawable.mutate();
  
                  if (tintInfo.mHasTintList) {
                      mForegroundInfo.mDrawable.setTintList(tintInfo.mTintList);
                  }
  
                  if (tintInfo.mHasTintMode) {
                      mForegroundInfo.mDrawable.setTintBlendMode(tintInfo.mBlendMode);
                  }
  
                  // The drawable (or one of its children) may not have been
                  // stateful before applying the tint, so let's try again.
                  if (mForegroundInfo.mDrawable.isStateful()) {
                      mForegroundInfo.mDrawable.setState(getDrawableState());
                  }
              }
          }
      }
  
      /**
       * Get the drawable to be overlayed when a view is autofilled
       *
       * @return The drawable
       *
       * @throws IllegalStateException if the drawable could not be found.
       */
      @Nullable private Drawable getAutofilledDrawable() {
          if (mAttachInfo == null) {
              return null;
          }
          // Lazily load the isAutofilled drawable.
          if (mAttachInfo.mAutofilledDrawable == null) {
              Context rootContext = getRootView().getContext();
              TypedArray a = rootContext.getTheme().obtainStyledAttributes(AUTOFILL_HIGHLIGHT_ATTR);
              int attributeResourceId = a.getResourceId(0, 0);
              mAttachInfo.mAutofilledDrawable = rootContext.getDrawable(attributeResourceId);
              a.recycle();
          }
  
          return mAttachInfo.mAutofilledDrawable;
      }
  
      /**
       * Draw {@link View#isAutofilled()} highlight over view if the view is autofilled.
       *
       * @param canvas The canvas to draw on
       */
      private void drawAutofilledHighlight(@NonNull Canvas canvas) {
          if (isAutofilled()) {
              Drawable autofilledHighlight = getAutofilledDrawable();
  
              if (autofilledHighlight != null) {
                  autofilledHighlight.setBounds(0, 0, getWidth(), getHeight());
                  autofilledHighlight.draw(canvas);
              }
          }
      }
  
      /**
       * Draw any foreground content for this view.
       *
       * <p>Foreground content may consist of scroll bars, a {@link #setForeground foreground}
       * drawable or other view-specific decorations. The foreground is drawn on top of the
       * primary view content.</p>
       *
       * @param canvas canvas to draw into
       */
      public void onDrawForeground(Canvas canvas) {
          onDrawScrollIndicators(canvas);
          onDrawScrollBars(canvas);
  
          final Drawable foreground = mForegroundInfo != null ? mForegroundInfo.mDrawable : null;
          if (foreground != null) {
              if (mForegroundInfo.mBoundsChanged) {
                  mForegroundInfo.mBoundsChanged = false;
                  final Rect selfBounds = mForegroundInfo.mSelfBounds;
                  final Rect overlayBounds = mForegroundInfo.mOverlayBounds;
  
                  if (mForegroundInfo.mInsidePadding) {
                      selfBounds.set(0, 0, getWidth(), getHeight());
                  } else {
                      selfBounds.set(getPaddingLeft(), getPaddingTop(),
                              getWidth() - getPaddingRight(), getHeight() - getPaddingBottom());
                  }
  
                  final int ld = getLayoutDirection();
                  Gravity.apply(mForegroundInfo.mGravity, foreground.getIntrinsicWidth(),
                          foreground.getIntrinsicHeight(), selfBounds, overlayBounds, ld);
                  foreground.setBounds(overlayBounds);
              }
  
              foreground.draw(canvas);
          }
      }
  
      /**
       * Sets the padding. The view may add on the space required to display
       * the scrollbars, depending on the style and visibility of the scrollbars.
       * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop},
       * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different
       * from the values set in this call.
       *
       * @attr ref android.R.styleable#View_padding
       * @attr ref android.R.styleable#View_paddingBottom
       * @attr ref android.R.styleable#View_paddingLeft
       * @attr ref android.R.styleable#View_paddingRight
       * @attr ref android.R.styleable#View_paddingTop
       * @param left the left padding in pixels
       * @param top the top padding in pixels
       * @param right the right padding in pixels
       * @param bottom the bottom padding in pixels
       */
      public void setPadding(int left, int top, int right, int bottom) {
          resetResolvedPaddingInternal();
  
          mUserPaddingStart = UNDEFINED_PADDING;
          mUserPaddingEnd = UNDEFINED_PADDING;
  
          mUserPaddingLeftInitial = left;
          mUserPaddingRightInitial = right;
  
          mLeftPaddingDefined = true;
          mRightPaddingDefined = true;
  
          internalSetPadding(left, top, right, bottom);
      }
  
      /**
       * @hide
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 123768420)
      protected void internalSetPadding(int left, int top, int right, int bottom) {
          mUserPaddingLeft = left;
          mUserPaddingRight = right;
          mUserPaddingBottom = bottom;
  
          final int viewFlags = mViewFlags;
          boolean changed = false;
  
          // Common case is there are no scroll bars.
          if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) {
              if ((viewFlags & SCROLLBARS_VERTICAL) != 0) {
                  final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0
                          ? 0 : getVerticalScrollbarWidth();
                  switch (mVerticalScrollbarPosition) {
                      case SCROLLBAR_POSITION_DEFAULT:
                          if (isLayoutRtl()) {
                              left += offset;
                          } else {
                              right += offset;
                          }
                          break;
                      case SCROLLBAR_POSITION_RIGHT:
                          right += offset;
                          break;
                      case SCROLLBAR_POSITION_LEFT:
                          left += offset;
                          break;
                  }
              }
              if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) {
                  bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0
                          ? 0 : getHorizontalScrollbarHeight();
              }
          }
  
          if (mPaddingLeft != left) {
              changed = true;
              mPaddingLeft = left;
          }
          if (mPaddingTop != top) {
              changed = true;
              mPaddingTop = top;
          }
          if (mPaddingRight != right) {
              changed = true;
              mPaddingRight = right;
          }
          if (mPaddingBottom != bottom) {
              changed = true;
              mPaddingBottom = bottom;
          }
  
          if (changed) {
              requestLayout();
              invalidateOutline();
          }
      }
  
      /**
       * Sets the relative padding. The view may add on the space required to display
       * the scrollbars, depending on the style and visibility of the scrollbars.
       * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop},
       * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different
       * from the values set in this call.
       *
       * @attr ref android.R.styleable#View_padding
       * @attr ref android.R.styleable#View_paddingBottom
       * @attr ref android.R.styleable#View_paddingStart
       * @attr ref android.R.styleable#View_paddingEnd
       * @attr ref android.R.styleable#View_paddingTop
       * @param start the start padding in pixels
       * @param top the top padding in pixels
       * @param end the end padding in pixels
       * @param bottom the bottom padding in pixels
       */
      public void setPaddingRelative(int start, int top, int end, int bottom) {
          resetResolvedPaddingInternal();
  
          mUserPaddingStart = start;
          mUserPaddingEnd = end;
          mLeftPaddingDefined = true;
          mRightPaddingDefined = true;
  
          switch(getLayoutDirection()) {
              case LAYOUT_DIRECTION_RTL:
                  mUserPaddingLeftInitial = end;
                  mUserPaddingRightInitial = start;
                  internalSetPadding(end, top, start, bottom);
                  break;
              case LAYOUT_DIRECTION_LTR:
              default:
                  mUserPaddingLeftInitial = start;
                  mUserPaddingRightInitial = end;
                  internalSetPadding(start, top, end, bottom);
          }
      }
  
      /**
       * A {@link View} can be inflated from an XML layout. For such Views this method returns the
       * resource ID of the source layout.
       *
       * @return The layout resource id if this view was inflated from XML, otherwise
       * {@link Resources#ID_NULL}.
       */
      @LayoutRes
      public int getSourceLayoutResId() {
          return mSourceLayoutId;
      }
  
      /**
       * Returns the top padding of this view.
       *
       * @return the top padding in pixels
       */
      @InspectableProperty
      public int getPaddingTop() {
          return mPaddingTop;
      }
  
      /**
       * Returns the bottom padding of this view. If there are inset and enabled
       * scrollbars, this value may include the space required to display the
       * scrollbars as well.
       *
       * @return the bottom padding in pixels
       */
      @InspectableProperty
      public int getPaddingBottom() {
          return mPaddingBottom;
      }
  
      /**
       * Returns the left padding of this view. If there are inset and enabled
       * scrollbars, this value may include the space required to display the
       * scrollbars as well.
       *
       * @return the left padding in pixels
       */
      @InspectableProperty
      public int getPaddingLeft() {
          if (!isPaddingResolved()) {
              resolvePadding();
          }
          return mPaddingLeft;
      }
  
      /**
       * Returns the start padding of this view depending on its resolved layout direction.
       * If there are inset and enabled scrollbars, this value may include the space
       * required to display the scrollbars as well.
       *
       * @return the start padding in pixels
       */
      public int getPaddingStart() {
          if (!isPaddingResolved()) {
              resolvePadding();
          }
          return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ?
                  mPaddingRight : mPaddingLeft;
      }
  
      /**
       * Returns the right padding of this view. If there are inset and enabled
       * scrollbars, this value may include the space required to display the
       * scrollbars as well.
       *
       * @return the right padding in pixels
       */
      @InspectableProperty
      public int getPaddingRight() {
          if (!isPaddingResolved()) {
              resolvePadding();
          }
          return mPaddingRight;
      }
  
      /**
       * Returns the end padding of this view depending on its resolved layout direction.
       * If there are inset and enabled scrollbars, this value may include the space
       * required to display the scrollbars as well.
       *
       * @return the end padding in pixels
       */
      public int getPaddingEnd() {
          if (!isPaddingResolved()) {
              resolvePadding();
          }
          return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ?
                  mPaddingLeft : mPaddingRight;
      }
  
      /**
       * Return if the padding has been set through relative values
       * {@link #setPaddingRelative(int, int, int, int)} or through
       * @attr ref android.R.styleable#View_paddingStart or
       * @attr ref android.R.styleable#View_paddingEnd
       *
       * @return true if the padding is relative or false if it is not.
       */
      public boolean isPaddingRelative() {
          return (mUserPaddingStart != UNDEFINED_PADDING || mUserPaddingEnd != UNDEFINED_PADDING);
      }
  
      Insets computeOpticalInsets() {
          return (mBackground == null) ? Insets.NONE : mBackground.getOpticalInsets();
      }
  
      /**
       * @hide
       */
      @UnsupportedAppUsage
      public void resetPaddingToInitialValues() {
          if (isRtlCompatibilityMode()) {
              mPaddingLeft = mUserPaddingLeftInitial;
              mPaddingRight = mUserPaddingRightInitial;
              return;
          }
          if (isLayoutRtl()) {
              mPaddingLeft = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingLeftInitial;
              mPaddingRight = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingRightInitial;
          } else {
              mPaddingLeft = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingLeftInitial;
              mPaddingRight = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingRightInitial;
          }
      }
  
      /**
       * @hide
       */
      public Insets getOpticalInsets() {
          if (mLayoutInsets == null) {
              mLayoutInsets = computeOpticalInsets();
          }
          return mLayoutInsets;
      }
  
      /**
       * Set this view's optical insets.
       *
       * <p>This method should be treated similarly to setMeasuredDimension and not as a general
       * property. Views that compute their own optical insets should call it as part of measurement.
       * This method does not request layout. If you are setting optical insets outside of
       * measure/layout itself you will want to call requestLayout() yourself.
       * </p>
       * @hide
       */
      public void setOpticalInsets(Insets insets) {
          mLayoutInsets = insets;
      }
  
      /**
       * Changes the selection state of this view. A view can be selected or not.
       * Note that selection is not the same as focus. Views are typically
       * selected in the context of an AdapterView like ListView or GridView;
       * the selected view is the view that is highlighted.
       *
       * @param selected true if the view must be selected, false otherwise
       */
      public void setSelected(boolean selected) {
          //noinspection DoubleNegation
          if (((mPrivateFlags & PFLAG_SELECTED) != 0) != selected) {
              mPrivateFlags = (mPrivateFlags & ~PFLAG_SELECTED) | (selected ? PFLAG_SELECTED : 0);
              if (!selected) resetPressedState();
              invalidate(true);
              refreshDrawableState();
              dispatchSetSelected(selected);
              if (selected) {
                  sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
              } else {
                  notifyViewAccessibilityStateChangedIfNeeded(
                          AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
              }
          }
      }
  
      /**
       * Dispatch setSelected to all of this View's children.
       *
       * @see #setSelected(boolean)
       *
       * @param selected The new selected state
       */
      protected void dispatchSetSelected(boolean selected) {
      }
  
      /**
       * Indicates the selection state of this view.
       *
       * @return true if the view is selected, false otherwise
       */
      @ViewDebug.ExportedProperty
      @InspectableProperty(hasAttributeId = false)
      public boolean isSelected() {
          return (mPrivateFlags & PFLAG_SELECTED) != 0;
      }
  
      /**
       * Changes the activated state of this view. A view can be activated or not.
       * Note that activation is not the same as selection.  Selection is
       * a transient property, representing the view (hierarchy) the user is
       * currently interacting with.  Activation is a longer-term state that the
       * user can move views in and out of.  For example, in a list view with
       * single or multiple selection enabled, the views in the current selection
       * set are activated.  (Um, yeah, we are deeply sorry about the terminology
       * here.)  The activated state is propagated down to children of the view it
       * is set on.
       *
       * @param activated true if the view must be activated, false otherwise
       */
      public void setActivated(boolean activated) {
          //noinspection DoubleNegation
          if (((mPrivateFlags & PFLAG_ACTIVATED) != 0) != activated) {
              mPrivateFlags = (mPrivateFlags & ~PFLAG_ACTIVATED) | (activated ? PFLAG_ACTIVATED : 0);
              invalidate(true);
              refreshDrawableState();
              dispatchSetActivated(activated);
          }
      }
  
      /**
       * Dispatch setActivated to all of this View's children.
       *
       * @see #setActivated(boolean)
       *
       * @param activated The new activated state
       */
      protected void dispatchSetActivated(boolean activated) {
      }
  
      /**
       * Indicates the activation state of this view.
       *
       * @return true if the view is activated, false otherwise
       */
      @ViewDebug.ExportedProperty
      @InspectableProperty(hasAttributeId = false)
      public boolean isActivated() {
          return (mPrivateFlags & PFLAG_ACTIVATED) != 0;
      }
  
      /**
       * Returns the ViewTreeObserver for this view's hierarchy. The view tree
       * observer can be used to get notifications when global events, like
       * layout, happen.
       *
       * The returned ViewTreeObserver observer is not guaranteed to remain
       * valid for the lifetime of this View. If the caller of this method keeps
       * a long-lived reference to ViewTreeObserver, it should always check for
       * the return value of {@link ViewTreeObserver#isAlive()}.
       *
       * @return The ViewTreeObserver for this view's hierarchy.
       */
      public ViewTreeObserver getViewTreeObserver() {
          if (mAttachInfo != null) {
              return mAttachInfo.mTreeObserver;
          }
          if (mFloatingTreeObserver == null) {
              mFloatingTreeObserver = new ViewTreeObserver(mContext);
          }
          return mFloatingTreeObserver;
      }
  
      /**
       * <p>Finds the topmost view in the current view hierarchy.</p>
       *
       * @return the topmost view containing this view
       */
      public View getRootView() {
          if (mAttachInfo != null) {
              final View v = mAttachInfo.mRootView;
              if (v != null) {
                  return v;
              }
          }
  
          View parent = this;
  
          while (parent.mParent != null && parent.mParent instanceof View) {
              parent = (View) parent.mParent;
          }
  
          return parent;
      }
  
      /**
       * Transforms a motion event from view-local coordinates to on-screen
       * coordinates.
       *
       * @param ev the view-local motion event
       * @return false if the transformation could not be applied
       * @hide
       */
      @UnsupportedAppUsage
      public boolean toGlobalMotionEvent(MotionEvent ev) {
          final AttachInfo info = mAttachInfo;
          if (info == null) {
              return false;
          }
  
          final Matrix m = info.mTmpMatrix;
          m.set(Matrix.IDENTITY_MATRIX);
          transformMatrixToGlobal(m);
          ev.transform(m);
          return true;
      }
  
      /**
       * Transforms a motion event from on-screen coordinates to view-local
       * coordinates.
       *
       * @param ev the on-screen motion event
       * @return false if the transformation could not be applied
       * @hide
       */
      @UnsupportedAppUsage
      public boolean toLocalMotionEvent(MotionEvent ev) {
          final AttachInfo info = mAttachInfo;
          if (info == null) {
              return false;
          }
  
          final Matrix m = info.mTmpMatrix;
          m.set(Matrix.IDENTITY_MATRIX);
          transformMatrixToLocal(m);
          ev.transform(m);
          return true;
      }
  
      /**
       * Modifies the input matrix such that it maps view-local coordinates to
       * on-screen coordinates.
       *
       * @param matrix input matrix to modify
       */
      public void transformMatrixToGlobal(@NonNull Matrix matrix) {
          final ViewParent parent = mParent;
          if (parent instanceof View) {
              final View vp = (View) parent;
              vp.transformMatrixToGlobal(matrix);
              matrix.preTranslate(-vp.mScrollX, -vp.mScrollY);
          } else if (parent instanceof ViewRootImpl) {
              final ViewRootImpl vr = (ViewRootImpl) parent;
              vr.transformMatrixToGlobal(matrix);
              matrix.preTranslate(0, -vr.mCurScrollY);
          }
  
          matrix.preTranslate(mLeft, mTop);
  
          if (!hasIdentityMatrix()) {
              matrix.preConcat(getMatrix());
          }
      }
  
      /**
       * Modifies the input matrix such that it maps on-screen coordinates to
       * view-local coordinates.
       *
       * @param matrix input matrix to modify
       */
      public void transformMatrixToLocal(@NonNull Matrix matrix) {
          final ViewParent parent = mParent;
          if (parent instanceof View) {
              final View vp = (View) parent;
              vp.transformMatrixToLocal(matrix);
              matrix.postTranslate(vp.mScrollX, vp.mScrollY);
          } else if (parent instanceof ViewRootImpl) {
              final ViewRootImpl vr = (ViewRootImpl) parent;
              vr.transformMatrixToLocal(matrix);
              matrix.postTranslate(0, vr.mCurScrollY);
          }
  
          matrix.postTranslate(-mLeft, -mTop);
  
          if (!hasIdentityMatrix()) {
              matrix.postConcat(getInverseMatrix());
          }
      }
  
      /**
       * @hide
       */
      @ViewDebug.ExportedProperty(category = "layout", indexMapping = {
              @ViewDebug.IntToString(from = 0, to = "x"),
              @ViewDebug.IntToString(from = 1, to = "y")
      })
      @UnsupportedAppUsage
      public int[] getLocationOnScreen() {
          int[] location = new int[2];
          getLocationOnScreen(location);
          return location;
      }
  
      /**
       * <p>Computes the coordinates of this view on the screen. The argument
       * must be an array of two integers. After the method returns, the array
       * contains the x and y location in that order.</p>
       *
       * @param outLocation an array of two integers in which to hold the coordinates
       */
      public void getLocationOnScreen(@Size(2) int[] outLocation) {
          getLocationInWindow(outLocation);
  
          final AttachInfo info = mAttachInfo;
          if (info != null) {
              outLocation[0] += info.mWindowLeft;
              outLocation[1] += info.mWindowTop;
          }
      }
  
      /**
       * <p>Computes the coordinates of this view in its window. The argument
       * must be an array of two integers. After the method returns, the array
       * contains the x and y location in that order.</p>
       *
       * @param outLocation an array of two integers in which to hold the coordinates
       */
      public void getLocationInWindow(@Size(2) int[] outLocation) {
          if (outLocation == null || outLocation.length < 2) {
              throw new IllegalArgumentException("outLocation must be an array of two integers");
          }
  
          outLocation[0] = 0;
          outLocation[1] = 0;
  
          transformFromViewToWindowSpace(outLocation);
      }
  
      /** @hide */
      public void transformFromViewToWindowSpace(@Size(2) int[] inOutLocation) {
          if (inOutLocation == null || inOutLocation.length < 2) {
              throw new IllegalArgumentException("inOutLocation must be an array of two integers");
          }
  
          if (mAttachInfo == null) {
              // When the view is not attached to a window, this method does not make sense
              inOutLocation[0] = inOutLocation[1] = 0;
              return;
          }
  
          float position[] = mAttachInfo.mTmpTransformLocation;
          position[0] = inOutLocation[0];
          position[1] = inOutLocation[1];
  
          if (!hasIdentityMatrix()) {
              getMatrix().mapPoints(position);
          }
  
          position[0] += mLeft;
          position[1] += mTop;
  
          ViewParent viewParent = mParent;
          while (viewParent instanceof View) {
              final View view = (View) viewParent;
  
              position[0] -= view.mScrollX;
              position[1] -= view.mScrollY;
  
              if (!view.hasIdentityMatrix()) {
                  view.getMatrix().mapPoints(position);
              }
  
              position[0] += view.mLeft;
              position[1] += view.mTop;
  
              viewParent = view.mParent;
           }
  
          if (viewParent instanceof ViewRootImpl) {
              // *cough*
              final ViewRootImpl vr = (ViewRootImpl) viewParent;
              position[1] -= vr.mCurScrollY;
          }
  
          inOutLocation[0] = Math.round(position[0]);
          inOutLocation[1] = Math.round(position[1]);
      }
  
      /**
       * @param id the id of the view to be found
       * @return the view of the specified id, null if cannot be found
       * @hide
       */
      protected <T extends View> T findViewTraversal(@IdRes int id) {
          if (id == mID) {
              return (T) this;
          }
          return null;
      }
  
      /**
       * @param tag the tag of the view to be found
       * @return the view of specified tag, null if cannot be found
       * @hide
       */
      protected <T extends View> T findViewWithTagTraversal(Object tag) {
          if (tag != null && tag.equals(mTag)) {
              return (T) this;
          }
          return null;
      }
  
      /**
       * @param predicate The predicate to evaluate.
       * @param childToSkip If not null, ignores this child during the recursive traversal.
       * @return The first view that matches the predicate or null.
       * @hide
       */
      protected <T extends View> T findViewByPredicateTraversal(Predicate<View> predicate,
              View childToSkip) {
          if (predicate.test(this)) {
              return (T) this;
          }
          return null;
      }
  
      /**
       * Finds the first descendant view with the given ID, the view itself if
       * the ID matches {@link #getId()}, or {@code null} if the ID is invalid
       * (< 0) or there is no matching view in the hierarchy.
       * <p>
       * <strong>Note:</strong> In most cases -- depending on compiler support --
       * the resulting view is automatically cast to the target class type. If
       * the target class type is unconstrained, an explicit cast may be
       * necessary.
       *
       * @param id the ID to search for
       * @return a view with given ID if found, or {@code null} otherwise
       * @see View#requireViewById(int)
       */
      @Nullable
      public final <T extends View> T findViewById(@IdRes int id) {
          if (id == NO_ID) {
              return null;
          }
          return findViewTraversal(id);
      }
  
      /**
       * Finds the first descendant view with the given ID, the view itself if the ID matches
       * {@link #getId()}, or throws an IllegalArgumentException if the ID is invalid or there is no
       * matching view in the hierarchy.
       * <p>
       * <strong>Note:</strong> In most cases -- depending on compiler support --
       * the resulting view is automatically cast to the target class type. If
       * the target class type is unconstrained, an explicit cast may be
       * necessary.
       *
       * @param id the ID to search for
       * @return a view with given ID
       * @see View#findViewById(int)
       */
      @NonNull
      public final <T extends View> T requireViewById(@IdRes int id) {
          T view = findViewById(id);
          if (view == null) {
              throw new IllegalArgumentException("ID does not reference a View inside this View");
          }
          return view;
      }
  
      /**
       * Performs the traversal to find a view by its unique and stable accessibility id.
       *
       * <strong>Note:</strong>This method does not stop at the root namespace
       * boundary since the user can touch the screen at an arbitrary location
       * potentially crossing the root namespace boundary which will send an
       * accessibility event to accessibility services and they should be able
       * to obtain the event source. Also accessibility ids are guaranteed to be
       * unique in the window.
       *
       * @param accessibilityId The accessibility id.
       * @return The found view.
       * @hide
       */
      public <T extends View> T findViewByAccessibilityIdTraversal(int accessibilityId) {
          if (getAccessibilityViewId() == accessibilityId) {
              return (T) this;
          }
          return null;
      }
  
      /**
       * Performs the traversal to find a view by its autofill id.
       *
       * <strong>Note:</strong>This method does not stop at the root namespace
       * boundary.
       *
       * @param autofillId The autofill id.
       * @return The found view.
       * @hide
       */
      public <T extends View> T findViewByAutofillIdTraversal(int autofillId) {
          if (getAutofillViewId() == autofillId) {
              return (T) this;
          }
          return null;
      }
  
      /**
       * Look for a child view with the given tag.  If this view has the given
       * tag, return this view.
       *
       * @param tag The tag to search for, using "tag.equals(getTag())".
       * @return The View that has the given tag in the hierarchy or null
       */
      public final <T extends View> T findViewWithTag(Object tag) {
          if (tag == null) {
              return null;
          }
          return findViewWithTagTraversal(tag);
      }
  
      /**
       * Look for a child view that matches the specified predicate.
       * If this view matches the predicate, return this view.
       *
       * @param predicate The predicate to evaluate.
       * @return The first view that matches the predicate or null.
       * @hide
       */
      public final <T extends View> T findViewByPredicate(Predicate<View> predicate) {
          return findViewByPredicateTraversal(predicate, null);
      }
  
      /**
       * Look for a child view that matches the specified predicate,
       * starting with the specified view and its descendents and then
       * recusively searching the ancestors and siblings of that view
       * until this view is reached.
       *
       * This method is useful in cases where the predicate does not match
       * a single unique view (perhaps multiple views use the same id)
       * and we are trying to find the view that is "closest" in scope to the
       * starting view.
       *
       * @param start The view to start from.
       * @param predicate The predicate to evaluate.
       * @return The first view that matches the predicate or null.
       * @hide
       */
      public final <T extends View> T findViewByPredicateInsideOut(
              View start, Predicate<View> predicate) {
          View childToSkip = null;
          for (;;) {
              T view = start.findViewByPredicateTraversal(predicate, childToSkip);
              if (view != null || start == this) {
                  return view;
              }
  
              ViewParent parent = start.getParent();
              if (parent == null || !(parent instanceof View)) {
                  return null;
              }
  
              childToSkip = start;
              start = (View) parent;
          }
      }
  
      /**
       * Sets the identifier for this view. The identifier does not have to be
       * unique in this view's hierarchy. The identifier should be a positive
       * number.
       *
       * @see #NO_ID
       * @see #getId()
       * @see #findViewById(int)
       *
       * @param id a number used to identify the view
       *
       * @attr ref android.R.styleable#View_id
       */
      public void setId(@IdRes int id) {
          mID = id;
          if (mID == View.NO_ID && mLabelForId != View.NO_ID) {
              mID = generateViewId();
          }
      }
  
      /**
       * {@hide}
       *
       * @param isRoot true if the view belongs to the root namespace, false
       *        otherwise
       */
      @TestApi
      public void setIsRootNamespace(boolean isRoot) {
          if (isRoot) {
              mPrivateFlags |= PFLAG_IS_ROOT_NAMESPACE;
          } else {
              mPrivateFlags &= ~PFLAG_IS_ROOT_NAMESPACE;
          }
      }
  
      /**
       * {@hide}
       *
       * @return true if the view belongs to the root namespace, false otherwise
       */
      @UnsupportedAppUsage
      public boolean isRootNamespace() {
          return (mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0;
      }
  
      /**
       * Returns this view's identifier.
       *
       * @return a positive integer used to identify the view or {@link #NO_ID}
       *         if the view has no ID
       *
       * @see #setId(int)
       * @see #findViewById(int)
       * @attr ref android.R.styleable#View_id
       */
      @IdRes
      @ViewDebug.CapturedViewProperty
      @InspectableProperty
      public int getId() {
          return mID;
      }
  
      /**
       * Get the identifier used for this view by the drawing system.
       *
       * @see RenderNode#getUniqueId()
       * @return A long that uniquely identifies this view's drawing component
       */
      public long getUniqueDrawingId() {
          return mRenderNode.getUniqueId();
      }
  
      /**
       * Returns this view's tag.
       *
       * @return the Object stored in this view as a tag, or {@code null} if not
       *         set
       *
       * @see #setTag(Object)
       * @see #getTag(int)
       */
      @ViewDebug.ExportedProperty
      @InspectableProperty
      public Object getTag() {
          return mTag;
      }
  
      /**
       * Sets the tag associated with this view. A tag can be used to mark
       * a view in its hierarchy and does not have to be unique within the
       * hierarchy. Tags can also be used to store data within a view without
       * resorting to another data structure.
       *
       * @param tag an Object to tag the view with
       *
       * @see #getTag()
       * @see #setTag(int, Object)
       */
      public void setTag(final Object tag) {
          mTag = tag;
      }
  
      /**
       * Returns the tag associated with this view and the specified key.
       *
       * @param key The key identifying the tag
       *
       * @return the Object stored in this view as a tag, or {@code null} if not
       *         set
       *
       * @see #setTag(int, Object)
       * @see #getTag()
       */
      public Object getTag(int key) {
          if (mKeyedTags != null) return mKeyedTags.get(key);
          return null;
      }
  
      /**
       * Sets a tag associated with this view and a key. A tag can be used
       * to mark a view in its hierarchy and does not have to be unique within
       * the hierarchy. Tags can also be used to store data within a view
       * without resorting to another data structure.
       *
       * The specified key should be an id declared in the resources of the
       * application to ensure it is unique (see the <a
       * href="{@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>).
       * Keys identified as belonging to
       * the Android framework or not associated with any package will cause
       * an {@link IllegalArgumentException} to be thrown.
       *
       * @param key The key identifying the tag
       * @param tag An Object to tag the view with
       *
       * @throws IllegalArgumentException If they specified key is not valid
       *
       * @see #setTag(Object)
       * @see #getTag(int)
       */
      public void setTag(int key, final Object tag) {
          // If the package id is 0x00 or 0x01, it's either an undefined package
          // or a framework id
          if ((key >>> 24) < 2) {
              throw new IllegalArgumentException("The key must be an application-specific "
                      + "resource id.");
          }
  
          setKeyedTag(key, tag);
      }
  
      /**
       * Variation of {@link #setTag(int, Object)} that enforces the key to be a
       * framework id.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public void setTagInternal(int key, Object tag) {
          if ((key >>> 24) != 0x1) {
              throw new IllegalArgumentException("The key must be a framework-specific "
                      + "resource id.");
          }
  
          setKeyedTag(key, tag);
      }
  
      private void setKeyedTag(int key, Object tag) {
          if (mKeyedTags == null) {
              mKeyedTags = new SparseArray<Object>(2);
          }
  
          mKeyedTags.put(key, tag);
      }
  
      /**
       * Prints information about this view in the log output, with the tag
       * {@link #VIEW_LOG_TAG}.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public void debug() {
          debug(0);
      }
  
      /**
       * Prints information about this view in the log output, with the tag
       * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an
       * indentation defined by the <code>depth</code>.
       *
       * @param depth the indentation level
       *
       * @hide
       */
      @UnsupportedAppUsage
      protected void debug(int depth) {
          String output = debugIndent(depth - 1);
  
          output += "+ " + this;
          int id = getId();
          if (id != -1) {
              output += " (id=" + id + ")";
          }
          Object tag = getTag();
          if (tag != null) {
              output += " (tag=" + tag + ")";
          }
          Log.d(VIEW_LOG_TAG, output);
  
          if ((mPrivateFlags & PFLAG_FOCUSED) != 0) {
              output = debugIndent(depth) + " FOCUSED";
              Log.d(VIEW_LOG_TAG, output);
          }
  
          output = debugIndent(depth);
          output += "frame={" + mLeft + ", " + mTop + ", " + mRight
                  + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY
                  + "} ";
          Log.d(VIEW_LOG_TAG, output);
  
          if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0
                  || mPaddingBottom != 0) {
              output = debugIndent(depth);
              output += "padding={" + mPaddingLeft + ", " + mPaddingTop
                      + ", " + mPaddingRight + ", " + mPaddingBottom + "}";
              Log.d(VIEW_LOG_TAG, output);
          }
  
          output = debugIndent(depth);
          output += "mMeasureWidth=" + mMeasuredWidth +
                  " mMeasureHeight=" + mMeasuredHeight;
          Log.d(VIEW_LOG_TAG, output);
  
          output = debugIndent(depth);
          if (mLayoutParams == null) {
              output += "BAD! no layout params";
          } else {
              output = mLayoutParams.debug(output);
          }
          Log.d(VIEW_LOG_TAG, output);
  
          output = debugIndent(depth);
          output += "flags={";
          output += View.printFlags(mViewFlags);
          output += "}";
          Log.d(VIEW_LOG_TAG, output);
  
          output = debugIndent(depth);
          output += "privateFlags={";
          output += View.printPrivateFlags(mPrivateFlags);
          output += "}";
          Log.d(VIEW_LOG_TAG, output);
      }
  
      /**
       * Creates a string of whitespaces used for indentation.
       *
       * @param depth the indentation level
       * @return a String containing (depth * 2 + 3) * 2 white spaces
       *
       * @hide
       */
      protected static String debugIndent(int depth) {
          StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2);
          for (int i = 0; i < (depth * 2) + 3; i++) {
              spaces.append(' ').append(' ');
          }
          return spaces.toString();
      }
  
      /**
       * <p>Return the offset of the widget's text baseline from the widget's top
       * boundary. If this widget does not support baseline alignment, this
       * method returns -1. </p>
       *
       * @return the offset of the baseline within the widget's bounds or -1
       *         if baseline alignment is not supported
       */
      @ViewDebug.ExportedProperty(category = "layout")
      @InspectableProperty
      public int getBaseline() {
          return -1;
      }
  
      /**
       * Returns whether the view hierarchy is currently undergoing a layout pass. This
       * information is useful to avoid situations such as calling {@link #requestLayout()} during
       * a layout pass.
       *
       * @return whether the view hierarchy is currently undergoing a layout pass
       */
      public boolean isInLayout() {
          ViewRootImpl viewRoot = getViewRootImpl();
          return (viewRoot != null && viewRoot.isInLayout());
      }
  
      /**
       * Call this when something has changed which has invalidated the
       * layout of this view. This will schedule a layout pass of the view
       * tree. This should not be called while the view hierarchy is currently in a layout
       * pass ({@link #isInLayout()}. If layout is happening, the request may be honored at the
       * end of the current layout pass (and then layout will run again) or after the current
       * frame is drawn and the next layout occurs.
       *
       * <p>Subclasses which override this method should call the superclass method to
       * handle possible request-during-layout errors correctly.</p>
       */
      @CallSuper
      public void requestLayout() {
          if (mMeasureCache != null) mMeasureCache.clear();
  
          if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == null) {
              // Only trigger request-during-layout logic if this is the view requesting it,
              // not the views in its parent hierarchy
              ViewRootImpl viewRoot = getViewRootImpl();
              if (viewRoot != null && viewRoot.isInLayout()) {
                  if (!viewRoot.requestLayoutDuringLayout(this)) {
                      return;
                  }
              }
              mAttachInfo.mViewRequestingLayout = this;
          }
  
          mPrivateFlags |= PFLAG_FORCE_LAYOUT;
          mPrivateFlags |= PFLAG_INVALIDATED;
  
          if (mParent != null && !mParent.isLayoutRequested()) {
              mParent.requestLayout();
          }
          if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == this) {
              mAttachInfo.mViewRequestingLayout = null;
          }
      }
  
      /**
       * Forces this view to be laid out during the next layout pass.
       * This method does not call requestLayout() or forceLayout()
       * on the parent.
       */
      public void forceLayout() {
          if (mMeasureCache != null) mMeasureCache.clear();
  
          mPrivateFlags |= PFLAG_FORCE_LAYOUT;
          mPrivateFlags |= PFLAG_INVALIDATED;
      }
  
      /**
       * <p>
       * This is called to find out how big a view should be. The parent
       * supplies constraint information in the width and height parameters.
       * </p>
       *
       * <p>
       * The actual measurement work of a view is performed in
       * {@link #onMeasure(int, int)}, called by this method. Therefore, only
       * {@link #onMeasure(int, int)} can and must be overridden by subclasses.
       * </p>
       *
       *
       * @param widthMeasureSpec Horizontal space requirements as imposed by the
       *        parent
       * @param heightMeasureSpec Vertical space requirements as imposed by the
       *        parent
       *
       * @see #onMeasure(int, int)
       */
      public final void measure(int widthMeasureSpec, int heightMeasureSpec) {
          boolean optical = isLayoutModeOptical(this);
          if (optical != isLayoutModeOptical(mParent)) {
              Insets insets = getOpticalInsets();
              int oWidth  = insets.left + insets.right;
              int oHeight = insets.top  + insets.bottom;
              widthMeasureSpec  = MeasureSpec.adjust(widthMeasureSpec,  optical ? -oWidth  : oWidth);
              heightMeasureSpec = MeasureSpec.adjust(heightMeasureSpec, optical ? -oHeight : oHeight);
          }
  
          // Suppress sign extension for the low bytes
          long key = (long) widthMeasureSpec << 32 | (long) heightMeasureSpec & 0xffffffffL;
          if (mMeasureCache == null) mMeasureCache = new LongSparseLongArray(2);
  
          final boolean forceLayout = (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT;
  
          // Optimize layout by avoiding an extra EXACTLY pass when the view is
          // already measured as the correct size. In API 23 and below, this
          // extra pass is required to make LinearLayout re-distribute weight.
          final boolean specChanged = widthMeasureSpec != mOldWidthMeasureSpec
                  || heightMeasureSpec != mOldHeightMeasureSpec;
          final boolean isSpecExactly = MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.EXACTLY
                  && MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.EXACTLY;
          final boolean matchesSpecSize = getMeasuredWidth() == MeasureSpec.getSize(widthMeasureSpec)
                  && getMeasuredHeight() == MeasureSpec.getSize(heightMeasureSpec);
          final boolean needsLayout = specChanged
                  && (sAlwaysRemeasureExactly || !isSpecExactly || !matchesSpecSize);
  
          if (forceLayout || needsLayout) {
              // first clears the measured dimension flag
              mPrivateFlags &= ~PFLAG_MEASURED_DIMENSION_SET;
  
              resolveRtlPropertiesIfNeeded();
  
              int cacheIndex = forceLayout ? -1 : mMeasureCache.indexOfKey(key);
              if (cacheIndex < 0 || sIgnoreMeasureCache) {
                  // measure ourselves, this should set the measured dimension flag back
                  onMeasure(widthMeasureSpec, heightMeasureSpec);
                  mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT;
              } else {
                  long value = mMeasureCache.valueAt(cacheIndex);
                  // Casting a long to int drops the high 32 bits, no mask needed
                  setMeasuredDimensionRaw((int) (value >> 32), (int) value);
                  mPrivateFlags3 |= PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT;
              }
  
              // flag not set, setMeasuredDimension() was not invoked, we raise
              // an exception to warn the developer
              if ((mPrivateFlags & PFLAG_MEASURED_DIMENSION_SET) != PFLAG_MEASURED_DIMENSION_SET) {
                  throw new IllegalStateException("View with id " + getId() + ": "
                          + getClass().getName() + "#onMeasure() did not set the"
                          + " measured dimension by calling"
                          + " setMeasuredDimension()");
              }
  
              mPrivateFlags |= PFLAG_LAYOUT_REQUIRED;
          }
  
          mOldWidthMeasureSpec = widthMeasureSpec;
          mOldHeightMeasureSpec = heightMeasureSpec;
  
          mMeasureCache.put(key, ((long) mMeasuredWidth) << 32 |
                  (long) mMeasuredHeight & 0xffffffffL); // suppress sign extension
      }
  
      /**
       * <p>
       * Measure the view and its content to determine the measured width and the
       * measured height. This method is invoked by {@link #measure(int, int)} and
       * should be overridden by subclasses to provide accurate and efficient
       * measurement of their contents.
       * </p>
       *
       * <p>
       * <strong>CONTRACT:</strong> When overriding this method, you
       * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the
       * measured width and height of this view. Failure to do so will trigger an
       * <code>IllegalStateException</code>, thrown by
       * {@link #measure(int, int)}. Calling the superclass'
       * {@link #onMeasure(int, int)} is a valid use.
       * </p>
       *
       * <p>
       * The base class implementation of measure defaults to the background size,
       * unless a larger size is allowed by the MeasureSpec. Subclasses should
       * override {@link #onMeasure(int, int)} to provide better measurements of
       * their content.
       * </p>
       *
       * <p>
       * If this method is overridden, it is the subclass's responsibility to make
       * sure the measured height and width are at least the view's minimum height
       * and width ({@link #getSuggestedMinimumHeight()} and
       * {@link #getSuggestedMinimumWidth()}).
       * </p>
       *
       * @param widthMeasureSpec horizontal space requirements as imposed by the parent.
       *                         The requirements are encoded with
       *                         {@link android.view.View.MeasureSpec}.
       * @param heightMeasureSpec vertical space requirements as imposed by the parent.
       *                         The requirements are encoded with
       *                         {@link android.view.View.MeasureSpec}.
       *
       * @see #getMeasuredWidth()
       * @see #getMeasuredHeight()
       * @see #setMeasuredDimension(int, int)
       * @see #getSuggestedMinimumHeight()
       * @see #getSuggestedMinimumWidth()
       * @see android.view.View.MeasureSpec#getMode(int)
       * @see android.view.View.MeasureSpec#getSize(int)
       */
      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
          setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec),
                  getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec));
      }
  
      /**
       * <p>This method must be called by {@link #onMeasure(int, int)} to store the
       * measured width and measured height. Failing to do so will trigger an
       * exception at measurement time.</p>
       *
       * @param measuredWidth The measured width of this view.  May be a complex
       * bit mask as defined by {@link #MEASURED_SIZE_MASK} and
       * {@link #MEASURED_STATE_TOO_SMALL}.
       * @param measuredHeight The measured height of this view.  May be a complex
       * bit mask as defined by {@link #MEASURED_SIZE_MASK} and
       * {@link #MEASURED_STATE_TOO_SMALL}.
       */
      protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) {
          boolean optical = isLayoutModeOptical(this);
          if (optical != isLayoutModeOptical(mParent)) {
              Insets insets = getOpticalInsets();
              int opticalWidth  = insets.left + insets.right;
              int opticalHeight = insets.top  + insets.bottom;
  
              measuredWidth  += optical ? opticalWidth  : -opticalWidth;
              measuredHeight += optical ? opticalHeight : -opticalHeight;
          }
          setMeasuredDimensionRaw(measuredWidth, measuredHeight);
      }
  
      /**
       * Sets the measured dimension without extra processing for things like optical bounds.
       * Useful for reapplying consistent values that have already been cooked with adjustments
       * for optical bounds, etc. such as those from the measurement cache.
       *
       * @param measuredWidth The measured width of this view.  May be a complex
       * bit mask as defined by {@link #MEASURED_SIZE_MASK} and
       * {@link #MEASURED_STATE_TOO_SMALL}.
       * @param measuredHeight The measured height of this view.  May be a complex
       * bit mask as defined by {@link #MEASURED_SIZE_MASK} and
       * {@link #MEASURED_STATE_TOO_SMALL}.
       */
      private void setMeasuredDimensionRaw(int measuredWidth, int measuredHeight) {
          mMeasuredWidth = measuredWidth;
          mMeasuredHeight = measuredHeight;
  
          mPrivateFlags |= PFLAG_MEASURED_DIMENSION_SET;
      }
  
      /**
       * Merge two states as returned by {@link #getMeasuredState()}.
       * @param curState The current state as returned from a view or the result
       * of combining multiple views.
       * @param newState The new view state to combine.
       * @return Returns a new integer reflecting the combination of the two
       * states.
       */
      public static int combineMeasuredStates(int curState, int newState) {
          return curState | newState;
      }
  
      /**
       * Version of {@link #resolveSizeAndState(int, int, int)}
       * returning only the {@link #MEASURED_SIZE_MASK} bits of the result.
       */
      public static int resolveSize(int size, int measureSpec) {
          return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK;
      }
  
      /**
       * Utility to reconcile a desired size and state, with constraints imposed
       * by a MeasureSpec. Will take the desired size, unless a different size
       * is imposed by the constraints. The returned value is a compound integer,
       * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and
       * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the
       * resulting size is smaller than the size the view wants to be.
       *
       * @param size How big the view wants to be.
       * @param measureSpec Constraints imposed by the parent.
       * @param childMeasuredState Size information bit mask for the view's
       *                           children.
       * @return Size information bit mask as defined by
       *         {@link #MEASURED_SIZE_MASK} and
       *         {@link #MEASURED_STATE_TOO_SMALL}.
       */
      public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) {
          final int specMode = MeasureSpec.getMode(measureSpec);
          final int specSize = MeasureSpec.getSize(measureSpec);
          final int result;
          switch (specMode) {
              case MeasureSpec.AT_MOST:
                  if (specSize < size) {
                      result = specSize | MEASURED_STATE_TOO_SMALL;
                  } else {
                      result = size;
                  }
                  break;
              case MeasureSpec.EXACTLY:
                  result = specSize;
                  break;
              case MeasureSpec.UNSPECIFIED:
              default:
                  result = size;
          }
          return result | (childMeasuredState & MEASURED_STATE_MASK);
      }
  
      /**
       * Utility to return a default size. Uses the supplied size if the
       * MeasureSpec imposed no constraints. Will get larger if allowed
       * by the MeasureSpec.
       *
       * @param size Default size for this view
       * @param measureSpec Constraints imposed by the parent
       * @return The size this view should be.
       */
      public static int getDefaultSize(int size, int measureSpec) {
          int result = size;
          int specMode = MeasureSpec.getMode(measureSpec);
          int specSize = MeasureSpec.getSize(measureSpec);
  
          switch (specMode) {
          case MeasureSpec.UNSPECIFIED:
              result = size;
              break;
          case MeasureSpec.AT_MOST:
          case MeasureSpec.EXACTLY:
              result = specSize;
              break;
          }
          return result;
      }
  
      /**
       * Returns the suggested minimum height that the view should use. This
       * returns the maximum of the view's minimum height
       * and the background's minimum height
       * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}).
       * <p>
       * When being used in {@link #onMeasure(int, int)}, the caller should still
       * ensure the returned height is within the requirements of the parent.
       *
       * @return The suggested minimum height of the view.
       */
      protected int getSuggestedMinimumHeight() {
          return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight());
  
      }
  
      /**
       * Returns the suggested minimum width that the view should use. This
       * returns the maximum of the view's minimum width
       * and the background's minimum width
       *  ({@link android.graphics.drawable.Drawable#getMinimumWidth()}).
       * <p>
       * When being used in {@link #onMeasure(int, int)}, the caller should still
       * ensure the returned width is within the requirements of the parent.
       *
       * @return The suggested minimum width of the view.
       */
      protected int getSuggestedMinimumWidth() {
          return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth());
      }
  
      /**
       * Returns the minimum height of the view.
       *
       * @return the minimum height the view will try to be, in pixels
       *
       * @see #setMinimumHeight(int)
       *
       * @attr ref android.R.styleable#View_minHeight
       */
      @InspectableProperty(name = "minHeight")
      public int getMinimumHeight() {
          return mMinHeight;
      }
  
      /**
       * Sets the minimum height of the view. It is not guaranteed the view will
       * be able to achieve this minimum height (for example, if its parent layout
       * constrains it with less available height).
       *
       * @param minHeight The minimum height the view will try to be, in pixels
       *
       * @see #getMinimumHeight()
       *
       * @attr ref android.R.styleable#View_minHeight
       */
      @RemotableViewMethod
      public void setMinimumHeight(int minHeight) {
          mMinHeight = minHeight;
          requestLayout();
      }
  
      /**
       * Returns the minimum width of the view.
       *
       * @return the minimum width the view will try to be, in pixels
       *
       * @see #setMinimumWidth(int)
       *
       * @attr ref android.R.styleable#View_minWidth
       */
      @InspectableProperty(name = "minWidth")
      public int getMinimumWidth() {
          return mMinWidth;
      }
  
      /**
       * Sets the minimum width of the view. It is not guaranteed the view will
       * be able to achieve this minimum width (for example, if its parent layout
       * constrains it with less available width).
       *
       * @param minWidth The minimum width the view will try to be, in pixels
       *
       * @see #getMinimumWidth()
       *
       * @attr ref android.R.styleable#View_minWidth
       */
      public void setMinimumWidth(int minWidth) {
          mMinWidth = minWidth;
          requestLayout();
  
      }
  
      /**
       * Get the animation currently associated with this view.
       *
       * @return The animation that is currently playing or
       *         scheduled to play for this view.
       */
      public Animation getAnimation() {
          return mCurrentAnimation;
      }
  
      /**
       * Start the specified animation now.
       *
       * @param animation the animation to start now
       */
      public void startAnimation(Animation animation) {
          animation.setStartTime(Animation.START_ON_FIRST_FRAME);
          setAnimation(animation);
          invalidateParentCaches();
          invalidate(true);
      }
  
      /**
       * Cancels any animations for this view.
       */
      public void clearAnimation() {
          if (mCurrentAnimation != null) {
              mCurrentAnimation.detach();
          }
          mCurrentAnimation = null;
          invalidateParentIfNeeded();
      }
  
      /**
       * Sets the next animation to play for this view.
       * If you want the animation to play immediately, use
       * {@link #startAnimation(android.view.animation.Animation)} instead.
       * This method provides allows fine-grained
       * control over the start time and invalidation, but you
       * must make sure that 1) the animation has a start time set, and
       * 2) the view's parent (which controls animations on its children)
       * will be invalidated when the animation is supposed to
       * start.
       *
       * @param animation The next animation, or null.
       */
      public void setAnimation(Animation animation) {
          mCurrentAnimation = animation;
  
          if (animation != null) {
              // If the screen is off assume the animation start time is now instead of
              // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time
              // would cause the animation to start when the screen turns back on
              if (mAttachInfo != null && mAttachInfo.mDisplayState == Display.STATE_OFF
                      && animation.getStartTime() == Animation.START_ON_FIRST_FRAME) {
                  animation.setStartTime(AnimationUtils.currentAnimationTimeMillis());
              }
              animation.reset();
          }
      }
  
      /**
       * Invoked by a parent ViewGroup to notify the start of the animation
       * currently associated with this view. If you override this method,
       * always call super.onAnimationStart();
       *
       * @see #setAnimation(android.view.animation.Animation)
       * @see #getAnimation()
       */
      @CallSuper
      protected void onAnimationStart() {
          mPrivateFlags |= PFLAG_ANIMATION_STARTED;
      }
  
      /**
       * Invoked by a parent ViewGroup to notify the end of the animation
       * currently associated with this view. If you override this method,
       * always call super.onAnimationEnd();
       *
       * @see #setAnimation(android.view.animation.Animation)
       * @see #getAnimation()
       */
      @CallSuper
      protected void onAnimationEnd() {
          mPrivateFlags &= ~PFLAG_ANIMATION_STARTED;
      }
  
      /**
       * Invoked if there is a Transform that involves alpha. Subclass that can
       * draw themselves with the specified alpha should return true, and then
       * respect that alpha when their onDraw() is called. If this returns false
       * then the view may be redirected to draw into an offscreen buffer to
       * fulfill the request, which will look fine, but may be slower than if the
       * subclass handles it internally. The default implementation returns false.
       *
       * @param alpha The alpha (0..255) to apply to the view's drawing
       * @return true if the view can draw with the specified alpha.
       */
      protected boolean onSetAlpha(int alpha) {
          return false;
      }
  
      /**
       * This is used by the RootView to perform an optimization when
       * the view hierarchy contains one or several SurfaceView.
       * SurfaceView is always considered transparent, but its children are not,
       * therefore all View objects remove themselves from the global transparent
       * region (passed as a parameter to this function).
       *
       * @param region The transparent region for this ViewAncestor (window).
       *
       * @return Returns true if the effective visibility of the view at this
       * point is opaque, regardless of the transparent region; returns false
       * if it is possible for underlying windows to be seen behind the view.
       *
       * {@hide}
       */
      @UnsupportedAppUsage
      public boolean gatherTransparentRegion(Region region) {
          final AttachInfo attachInfo = mAttachInfo;
          if (region != null && attachInfo != null) {
              final int pflags = mPrivateFlags;
              if ((pflags & PFLAG_SKIP_DRAW) == 0) {
                  // The SKIP_DRAW flag IS NOT set, so this view draws. We need to
                  // remove it from the transparent region.
                  final int[] location = attachInfo.mTransparentLocation;
                  getLocationInWindow(location);
                  // When a view has Z value, then it will be better to leave some area below the view
                  // for drawing shadow. The shadow outset is proportional to the Z value. Note that
                  // the bottom part needs more offset than the left, top and right parts due to the
                  // spot light effects.
                  int shadowOffset = getZ() > 0 ? (int) getZ() : 0;
                  region.op(location[0] - shadowOffset, location[1] - shadowOffset,
                          location[0] + mRight - mLeft + shadowOffset,
                          location[1] + mBottom - mTop + (shadowOffset * 3), Region.Op.DIFFERENCE);
              } else {
                  if (mBackground != null && mBackground.getOpacity() != PixelFormat.TRANSPARENT) {
                      // The SKIP_DRAW flag IS set and the background drawable exists, we remove
                      // the background drawable's non-transparent parts from this transparent region.
                      applyDrawableToTransparentRegion(mBackground, region);
                  }
                  if (mForegroundInfo != null && mForegroundInfo.mDrawable != null
                          && mForegroundInfo.mDrawable.getOpacity() != PixelFormat.TRANSPARENT) {
                      // Similarly, we remove the foreground drawable's non-transparent parts.
                      applyDrawableToTransparentRegion(mForegroundInfo.mDrawable, region);
                  }
                  if (mDefaultFocusHighlight != null
                          && mDefaultFocusHighlight.getOpacity() != PixelFormat.TRANSPARENT) {
                      // Similarly, we remove the default focus highlight's non-transparent parts.
                      applyDrawableToTransparentRegion(mDefaultFocusHighlight, region);
                  }
              }
          }
          return true;
      }
  
      /**
       * Play a sound effect for this view.
       *
       * <p>The framework will play sound effects for some built in actions, such as
       * clicking, but you may wish to play these effects in your widget,
       * for instance, for internal navigation.
       *
       * <p>The sound effect will only be played if sound effects are enabled by the user, and
       * {@link #isSoundEffectsEnabled()} is true.
       *
       * @param soundConstant One of the constants defined in {@link SoundEffectConstants}
       */
      public void playSoundEffect(int soundConstant) {
          if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) {
              return;
          }
          mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant);
      }
  
      /**
       * BZZZTT!!1!
       *
       * <p>Provide haptic feedback to the user for this view.
       *
       * <p>The framework will provide haptic feedback for some built in actions,
       * such as long presses, but you may wish to provide feedback for your
       * own widget.
       *
       * <p>The feedback will only be performed if
       * {@link #isHapticFeedbackEnabled()} is true.
       *
       * @param feedbackConstant One of the constants defined in
       * {@link HapticFeedbackConstants}
       */
      public boolean performHapticFeedback(int feedbackConstant) {
          return performHapticFeedback(feedbackConstant, 0);
      }
  
      /**
       * BZZZTT!!1!
       *
       * <p>Like {@link #performHapticFeedback(int)}, with additional options.
       *
       * @param feedbackConstant One of the constants defined in
       * {@link HapticFeedbackConstants}
       * @param flags Additional flags as per {@link HapticFeedbackConstants}.
       */
      public boolean performHapticFeedback(int feedbackConstant, int flags) {
          if (mAttachInfo == null) {
              return false;
          }
          //noinspection SimplifiableIfStatement
          if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0
                  && !isHapticFeedbackEnabled()) {
              return false;
          }
          return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant,
                  (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0);
      }
  
      /**
       * Request that the visibility of the status bar or other screen/window
       * decorations be changed.
       *
       * <p>This method is used to put the over device UI into temporary modes
       * where the user's attention is focused more on the application content,
       * by dimming or hiding surrounding system affordances.  This is typically
       * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY
       * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content
       * to be placed behind the action bar (and with these flags other system
       * affordances) so that smooth transitions between hiding and showing them
       * can be done.
       *
       * <p>Two representative examples of the use of system UI visibility is
       * implementing a content browsing application (like a magazine reader)
       * and a video playing application.
       *
       * <p>The first code shows a typical implementation of a View in a content
       * browsing application.  In this implementation, the application goes
       * into a content-oriented mode by hiding the status bar and action bar,
       * and putting the navigation elements into lights out mode.  The user can
       * then interact with content while in this mode.  Such an application should
       * provide an easy way for the user to toggle out of the mode (such as to
       * check information in the status bar or access notifications).  In the
       * implementation here, this is done simply by tapping on the content.
       *
       * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java
       *      content}
       *
       * <p>This second code sample shows a typical implementation of a View
       * in a video playing application.  In this situation, while the video is
       * playing the application would like to go into a complete full-screen mode,
       * to use as much of the display as possible for the video.  When in this state
       * the user can not interact with the application; the system intercepts
       * touching on the screen to pop the UI out of full screen mode.  See
       * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code.
       *
       * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java
       *      content}
       *
       * @param visibility  Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE},
       * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN},
       * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION},
       * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}, {@link #SYSTEM_UI_FLAG_IMMERSIVE},
       * and {@link #SYSTEM_UI_FLAG_IMMERSIVE_STICKY}.
       */
      public void setSystemUiVisibility(int visibility) {
          if (visibility != mSystemUiVisibility) {
              mSystemUiVisibility = visibility;
              if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) {
                  mParent.recomputeViewAttributes(this);
              }
          }
      }
  
      /**
       * Returns the last {@link #setSystemUiVisibility(int)} that this view has requested.
       * @return  Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE},
       * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN},
       * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION},
       * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}, {@link #SYSTEM_UI_FLAG_IMMERSIVE},
       * and {@link #SYSTEM_UI_FLAG_IMMERSIVE_STICKY}.
       */
      public int getSystemUiVisibility() {
          return mSystemUiVisibility;
      }
  
      /**
       * Returns the current system UI visibility that is currently set for
       * the entire window.  This is the combination of the
       * {@link #setSystemUiVisibility(int)} values supplied by all of the
       * views in the window.
       */
      public int getWindowSystemUiVisibility() {
          return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0;
      }
  
      /**
       * Override to find out when the window's requested system UI visibility
       * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}.
       * This is different from the callbacks received through
       * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)}
       * in that this is only telling you about the local request of the window,
       * not the actual values applied by the system.
       */
      public void onWindowSystemUiVisibilityChanged(int visible) {
      }
  
      /**
       * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down
       * the view hierarchy.
       */
      public void dispatchWindowSystemUiVisiblityChanged(int visible) {
          onWindowSystemUiVisibilityChanged(visible);
      }
  
      /**
       * Set a listener to receive callbacks when the visibility of the system bar changes.
       * @param l  The {@link OnSystemUiVisibilityChangeListener} to receive callbacks.
       */
      public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) {
          getListenerInfo().mOnSystemUiVisibilityChangeListener = l;
          if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) {
              mParent.recomputeViewAttributes(this);
          }
      }
  
      /**
       * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down
       * the view hierarchy.
       */
      public void dispatchSystemUiVisibilityChanged(int visibility) {
          ListenerInfo li = mListenerInfo;
          if (li != null && li.mOnSystemUiVisibilityChangeListener != null) {
              li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange(
                      visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK);
          }
      }
  
      boolean updateLocalSystemUiVisibility(int localValue, int localChanges) {
          int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges);
          if (val != mSystemUiVisibility) {
              setSystemUiVisibility(val);
              return true;
          }
          return false;
      }
  
      /** @hide */
      @UnsupportedAppUsage
      public void setDisabledSystemUiVisibility(int flags) {
          if (mAttachInfo != null) {
              if (mAttachInfo.mDisabledSystemUiVisibility != flags) {
                  mAttachInfo.mDisabledSystemUiVisibility = flags;
                  if (mParent != null) {
                      mParent.recomputeViewAttributes(this);
                  }
              }
          }
      }
  
      /**
       * Creates an image that the system displays during the drag and drop
       * operation. This is called a &quot;drag shadow&quot;. The default implementation
       * for a DragShadowBuilder based on a View returns an image that has exactly the same
       * appearance as the given View. The default also positions the center of the drag shadow
       * directly under the touch point. If no View is provided (the constructor with no parameters
       * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and
       * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overridden, then the
       * default is an invisible drag shadow.
       * <p>
       * You are not required to use the View you provide to the constructor as the basis of the
       * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw
       * anything you want as the drag shadow.
       * </p>
       * <p>
       *  You pass a DragShadowBuilder object to the system when you start the drag. The system
       *  calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the
       *  size and position of the drag shadow. It uses this data to construct a
       *  {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()}
       *  so that your application can draw the shadow image in the Canvas.
       * </p>
       *
       * <div class="special reference">
       * <h3>Developer Guides</h3>
       * <p>For a guide to implementing drag and drop features, read the
       * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p>
       * </div>
       */
      public static class DragShadowBuilder {
          @UnsupportedAppUsage
          private final WeakReference<View> mView;
  
          /**
           * Constructs a shadow image builder based on a View. By default, the resulting drag
           * shadow will have the same appearance and dimensions as the View, with the touch point
           * over the center of the View.
           * @param view A View. Any View in scope can be used.
           */
          public DragShadowBuilder(View view) {
              mView = new WeakReference<View>(view);
          }
  
          /**
           * Construct a shadow builder object with no associated View.  This
           * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)}
           * and {@link #onDrawShadow(Canvas)} methods are also overridden in order
           * to supply the drag shadow's dimensions and appearance without
           * reference to any View object.
           */
          public DragShadowBuilder() {
              mView = new WeakReference<View>(null);
          }
  
          /**
           * Returns the View object that had been passed to the
           * {@link #View.DragShadowBuilder(View)}
           * constructor.  If that View parameter was {@code null} or if the
           * {@link #View.DragShadowBuilder()}
           * constructor was used to instantiate the builder object, this method will return
           * null.
           *
           * @return The View object associate with this builder object.
           */
          @SuppressWarnings({"JavadocReference"})
          final public View getView() {
              return mView.get();
          }
  
          /**
           * Provides the metrics for the shadow image. These include the dimensions of
           * the shadow image, and the point within that shadow that should
           * be centered under the touch location while dragging.
           * <p>
           * The default implementation sets the dimensions of the shadow to be the
           * same as the dimensions of the View itself and centers the shadow under
           * the touch point.
           * </p>
           *
           * @param outShadowSize A {@link android.graphics.Point} containing the width and height
           * of the shadow image. Your application must set {@link android.graphics.Point#x} to the
           * desired width and must set {@link android.graphics.Point#y} to the desired height of the
           * image. Since Android P, the width and height must be positive values.
           *
           * @param outShadowTouchPoint A {@link android.graphics.Point} for the position within the
           * shadow image that should be underneath the touch point during the drag and drop
           * operation. Your application must set {@link android.graphics.Point#x} to the
           * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position.
           */
          public void onProvideShadowMetrics(Point outShadowSize, Point outShadowTouchPoint) {
              final View view = mView.get();
              if (view != null) {
                  outShadowSize.set(view.getWidth(), view.getHeight());
                  outShadowTouchPoint.set(outShadowSize.x / 2, outShadowSize.y / 2);
              } else {
                  Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view");
              }
          }
  
          /**
           * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object
           * based on the dimensions it received from the
           * {@link #onProvideShadowMetrics(Point, Point)} callback.
           *
           * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image.
           */
          public void onDrawShadow(Canvas canvas) {
              final View view = mView.get();
              if (view != null) {
                  view.draw(canvas);
              } else {
                  Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view");
              }
          }
      }
  
      /**
       * @deprecated Use {@link #startDragAndDrop(ClipData, DragShadowBuilder, Object, int)
       * startDragAndDrop()} for newer platform versions.
       */
      @Deprecated
      public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder,
                                     Object myLocalState, int flags) {
          return startDragAndDrop(data, shadowBuilder, myLocalState, flags);
      }
  
      /**
       * Starts a drag and drop operation. When your application calls this method, it passes a
       * {@link android.view.View.DragShadowBuilder} object to the system. The
       * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)}
       * to get metrics for the drag shadow, and then calls the object's
       * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself.
       * <p>
       *  Once the system has the drag shadow, it begins the drag and drop operation by sending
       *  drag events to all the View objects in your application that are currently visible. It does
       *  this either by calling the View object's drag listener (an implementation of
       *  {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the
       *  View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method.
       *  Both are passed a {@link android.view.DragEvent} object that has a
       *  {@link android.view.DragEvent#getAction()} value of
       *  {@link android.view.DragEvent#ACTION_DRAG_STARTED}.
       * </p>
       * <p>
       * Your application can invoke {@link #startDragAndDrop(ClipData, DragShadowBuilder, Object,
       * int) startDragAndDrop()} on any attached View object. The View object does not need to be
       * the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to be related
       * to the View the user selected for dragging.
       * </p>
       * @param data A {@link android.content.ClipData} object pointing to the data to be
       * transferred by the drag and drop operation.
       * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the
       * drag shadow.
       * @param myLocalState An {@link java.lang.Object} containing local data about the drag and
       * drop operation. When dispatching drag events to views in the same activity this object
       * will be available through {@link android.view.DragEvent#getLocalState()}. Views in other
       * activities will not have access to this data ({@link android.view.DragEvent#getLocalState()}
       * will return null).
       * <p>
       * myLocalState is a lightweight mechanism for the sending information from the dragged View
       * to the target Views. For example, it can contain flags that differentiate between a
       * a copy operation and a move operation.
       * </p>
       * @param flags Flags that control the drag and drop operation. This can be set to 0 for no
       * flags, or any combination of the following:
       *     <ul>
       *         <li>{@link #DRAG_FLAG_GLOBAL}</li>
       *         <li>{@link #DRAG_FLAG_GLOBAL_PERSISTABLE_URI_PERMISSION}</li>
       *         <li>{@link #DRAG_FLAG_GLOBAL_PREFIX_URI_PERMISSION}</li>
       *         <li>{@link #DRAG_FLAG_GLOBAL_URI_READ}</li>
       *         <li>{@link #DRAG_FLAG_GLOBAL_URI_WRITE}</li>
       *         <li>{@link #DRAG_FLAG_OPAQUE}</li>
       *     </ul>
       * @return {@code true} if the method completes successfully, or
       * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to
       * do a drag because of another ongoing operation or some other reasons.
       */
      public final boolean startDragAndDrop(ClipData data, DragShadowBuilder shadowBuilder,
              Object myLocalState, int flags) {
          if (ViewDebug.DEBUG_DRAG) {
              Log.d(VIEW_LOG_TAG, "startDragAndDrop: data=" + data + " flags=" + flags);
          }
          if (mAttachInfo == null) {
              Log.w(VIEW_LOG_TAG, "startDragAndDrop called on a detached view.");
              return false;
          }
          if (!mAttachInfo.mViewRootImpl.mSurface.isValid()) {
              Log.w(VIEW_LOG_TAG, "startDragAndDrop called with an invalid surface.");
              return false;
          }
  
          if (data != null) {
              data.prepareToLeaveProcess((flags & View.DRAG_FLAG_GLOBAL) != 0);
          }
  
          Point shadowSize = new Point();
          Point shadowTouchPoint = new Point();
          shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint);
  
          if ((shadowSize.x < 0) || (shadowSize.y < 0)
                  || (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) {
              throw new IllegalStateException("Drag shadow dimensions must not be negative");
          }
  
          // Create 1x1 surface when zero surface size is specified because SurfaceControl.Builder
          // does not accept zero size surface.
          if (shadowSize.x == 0  || shadowSize.y == 0) {
              if (!sAcceptZeroSizeDragShadow) {
                  throw new IllegalStateException("Drag shadow dimensions must be positive");
              }
              shadowSize.x = 1;
              shadowSize.y = 1;
          }
  
          if (ViewDebug.DEBUG_DRAG) {
              Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y
                      + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y);
          }
  
          final ViewRootImpl root = mAttachInfo.mViewRootImpl;
          final SurfaceSession session = new SurfaceSession();
          final SurfaceControl surfaceControl = new SurfaceControl.Builder(session)
                  .setName("drag surface")
                  .setParent(root.getSurfaceControl())
                  .setBufferSize(shadowSize.x, shadowSize.y)
                  .setFormat(PixelFormat.TRANSLUCENT)
                  .build();
          final Surface surface = new Surface();
          surface.copyFrom(surfaceControl);
          IBinder token = null;
          try {
              final Canvas canvas = surface.lockCanvas(null);
              try {
                  canvas.drawColor(0, PorterDuff.Mode.CLEAR);
                  shadowBuilder.onDrawShadow(canvas);
              } finally {
                  surface.unlockCanvasAndPost(canvas);
              }
  
              // repurpose 'shadowSize' for the last touch point
              root.getLastTouchPoint(shadowSize);
  
              token = mAttachInfo.mSession.performDrag(
                      mAttachInfo.mWindow, flags, surfaceControl, root.getLastTouchSource(),
                      shadowSize.x, shadowSize.y, shadowTouchPoint.x, shadowTouchPoint.y, data);
              if (ViewDebug.DEBUG_DRAG) {
                  Log.d(VIEW_LOG_TAG, "performDrag returned " + token);
              }
              if (token != null) {
                  if (mAttachInfo.mDragSurface != null) {
                      mAttachInfo.mDragSurface.release();
                  }
                  mAttachInfo.mDragSurface = surface;
                  mAttachInfo.mDragToken = token;
                  // Cache the local state object for delivery with DragEvents
                  root.setLocalDragState(myLocalState);
              }
              return token != null;
          } catch (Exception e) {
              Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e);
              return false;
          } finally {
              if (token == null) {
                  surface.destroy();
              }
              session.kill();
          }
      }
  
      /**
       * Cancels an ongoing drag and drop operation.
       * <p>
       * A {@link android.view.DragEvent} object with
       * {@link android.view.DragEvent#getAction()} value of
       * {@link android.view.DragEvent#ACTION_DRAG_ENDED} and
       * {@link android.view.DragEvent#getResult()} value of {@code false}
       * will be sent to every
       * View that received {@link android.view.DragEvent#ACTION_DRAG_STARTED}
       * even if they are not currently visible.
       * </p>
       * <p>
       * This method can be called on any View in the same window as the View on which
       * {@link #startDragAndDrop(ClipData, DragShadowBuilder, Object, int) startDragAndDrop}
       * was called.
       * </p>
       */
      public final void cancelDragAndDrop() {
          if (ViewDebug.DEBUG_DRAG) {
              Log.d(VIEW_LOG_TAG, "cancelDragAndDrop");
          }
          if (mAttachInfo == null) {
              Log.w(VIEW_LOG_TAG, "cancelDragAndDrop called on a detached view.");
              return;
          }
          if (mAttachInfo.mDragToken != null) {
              try {
                  mAttachInfo.mSession.cancelDragAndDrop(mAttachInfo.mDragToken, false);
              } catch (Exception e) {
                  Log.e(VIEW_LOG_TAG, "Unable to cancel drag", e);
              }
              mAttachInfo.mDragToken = null;
          } else {
              Log.e(VIEW_LOG_TAG, "No active drag to cancel");
          }
      }
  
      /**
       * Updates the drag shadow for the ongoing drag and drop operation.
       *
       * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the
       * new drag shadow.
       */
      public final void updateDragShadow(DragShadowBuilder shadowBuilder) {
          if (ViewDebug.DEBUG_DRAG) {
              Log.d(VIEW_LOG_TAG, "updateDragShadow");
          }
          if (mAttachInfo == null) {
              Log.w(VIEW_LOG_TAG, "updateDragShadow called on a detached view.");
              return;
          }
          if (mAttachInfo.mDragToken != null) {
              try {
                  Canvas canvas = mAttachInfo.mDragSurface.lockCanvas(null);
                  try {
                      canvas.drawColor(0, PorterDuff.Mode.CLEAR);
                      shadowBuilder.onDrawShadow(canvas);
                  } finally {
                      mAttachInfo.mDragSurface.unlockCanvasAndPost(canvas);
                  }
              } catch (Exception e) {
                  Log.e(VIEW_LOG_TAG, "Unable to update drag shadow", e);
              }
          } else {
              Log.e(VIEW_LOG_TAG, "No active drag");
          }
      }
  
      /**
       * Starts a move from {startX, startY}, the amount of the movement will be the offset
       * between {startX, startY} and the new cursor positon.
       * @param startX horizontal coordinate where the move started.
       * @param startY vertical coordinate where the move started.
       * @return whether moving was started successfully.
       * @hide
       */
      public final boolean startMovingTask(float startX, float startY) {
          if (ViewDebug.DEBUG_POSITIONING) {
              Log.d(VIEW_LOG_TAG, "startMovingTask: {" + startX + "," + startY + "}");
          }
          try {
              return mAttachInfo.mSession.startMovingTask(mAttachInfo.mWindow, startX, startY);
          } catch (RemoteException e) {
              Log.e(VIEW_LOG_TAG, "Unable to start moving", e);
          }
          return false;
      }
  
      /**
       * Finish a window move task.
       * @hide
       */
      public void finishMovingTask() {
          if (ViewDebug.DEBUG_POSITIONING) {
              Log.d(VIEW_LOG_TAG, "finishMovingTask");
          }
          try {
              mAttachInfo.mSession.finishMovingTask(mAttachInfo.mWindow);
          } catch (RemoteException e) {
              Log.e(VIEW_LOG_TAG, "Unable to finish moving", e);
          }
      }
  
      /**
       * Handles drag events sent by the system following a call to
       * {@link android.view.View#startDragAndDrop(ClipData,DragShadowBuilder,Object,int)
       * startDragAndDrop()}.
       *<p>
       * When the system calls this method, it passes a
       * {@link android.view.DragEvent} object. A call to
       * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined
       * in DragEvent. The method uses these to determine what is happening in the drag and drop
       * operation.
       * @param event The {@link android.view.DragEvent} sent by the system.
       * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined
       * in DragEvent, indicating the type of drag event represented by this object.
       * @return {@code true} if the method was successful, otherwise {@code false}.
       * <p>
       *  The method should return {@code true} in response to an action type of
       *  {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current
       *  operation.
       * </p>
       * <p>
       *  The method should also return {@code true} in response to an action type of
       *  {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or
       *  {@code false} if it didn't.
       * </p>
       * <p>
       *  For all other events, the return value is ignored.
       * </p>
       */
      public boolean onDragEvent(DragEvent event) {
          return false;
      }
  
      // Dispatches ACTION_DRAG_ENTERED and ACTION_DRAG_EXITED events for pre-Nougat apps.
      boolean dispatchDragEnterExitInPreN(DragEvent event) {
          return callDragEventHandler(event);
      }
  
      /**
       * Detects if this View is enabled and has a drag event listener.
       * If both are true, then it calls the drag event listener with the
       * {@link android.view.DragEvent} it received. If the drag event listener returns
       * {@code true}, then dispatchDragEvent() returns {@code true}.
       * <p>
       * For all other cases, the method calls the
       * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler
       * method and returns its result.
       * </p>
       * <p>
       * This ensures that a drag event is always consumed, even if the View does not have a drag
       * event listener. However, if the View has a listener and the listener returns true, then
       * onDragEvent() is not called.
       * </p>
       */
      public boolean dispatchDragEvent(DragEvent event) {
          event.mEventHandlerWasCalled = true;
          if (event.mAction == DragEvent.ACTION_DRAG_LOCATION ||
              event.mAction == DragEvent.ACTION_DROP) {
              // About to deliver an event with coordinates to this view. Notify that now this view
              // has drag focus. This will send exit/enter events as needed.
              getViewRootImpl().setDragFocus(this, event);
          }
          return callDragEventHandler(event);
      }
  
      final boolean callDragEventHandler(DragEvent event) {
          final boolean result;
  
          ListenerInfo li = mListenerInfo;
          //noinspection SimplifiableIfStatement
          if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED
                  && li.mOnDragListener.onDrag(this, event)) {
              result = true;
          } else {
              result = onDragEvent(event);
          }
  
          switch (event.mAction) {
              case DragEvent.ACTION_DRAG_ENTERED: {
                  mPrivateFlags2 |= View.PFLAG2_DRAG_HOVERED;
                  refreshDrawableState();
              } break;
              case DragEvent.ACTION_DRAG_EXITED: {
                  mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED;
                  refreshDrawableState();
              } break;
              case DragEvent.ACTION_DRAG_ENDED: {
                  mPrivateFlags2 &= ~View.DRAG_MASK;
                  refreshDrawableState();
              } break;
          }
  
          return result;
      }
  
      boolean canAcceptDrag() {
          return (mPrivateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0;
      }
  
      /**
       * This needs to be a better API (NOT ON VIEW) before it is exposed.  If
       * it is ever exposed at all.
       * @hide
       */
      @UnsupportedAppUsage
      public void onCloseSystemDialogs(String reason) {
      }
  
      /**
       * Given a Drawable whose bounds have been set to draw into this view,
       * update a Region being computed for
       * {@link #gatherTransparentRegion(android.graphics.Region)} so
       * that any non-transparent parts of the Drawable are removed from the
       * given transparent region.
       *
       * @param dr The Drawable whose transparency is to be applied to the region.
       * @param region A Region holding the current transparency information,
       * where any parts of the region that are set are considered to be
       * transparent.  On return, this region will be modified to have the
       * transparency information reduced by the corresponding parts of the
       * Drawable that are not transparent.
       * {@hide}
       */
      @UnsupportedAppUsage
      public void applyDrawableToTransparentRegion(Drawable dr, Region region) {
          if (DBG) {
              Log.i("View", "Getting transparent region for: " + this);
          }
          final Region r = dr.getTransparentRegion();
          final Rect db = dr.getBounds();
          final AttachInfo attachInfo = mAttachInfo;
          if (r != null && attachInfo != null) {
              final int w = getRight()-getLeft();
              final int h = getBottom()-getTop();
              if (db.left > 0) {
                  //Log.i("VIEW", "Drawable left " + db.left + " > view 0");
                  r.op(0, 0, db.left, h, Region.Op.UNION);
              }
              if (db.right < w) {
                  //Log.i("VIEW", "Drawable right " + db.right + " < view " + w);
                  r.op(db.right, 0, w, h, Region.Op.UNION);
              }
              if (db.top > 0) {
                  //Log.i("VIEW", "Drawable top " + db.top + " > view 0");
                  r.op(0, 0, w, db.top, Region.Op.UNION);
              }
              if (db.bottom < h) {
                  //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h);
                  r.op(0, db.bottom, w, h, Region.Op.UNION);
              }
              final int[] location = attachInfo.mTransparentLocation;
              getLocationInWindow(location);
              r.translate(location[0], location[1]);
              region.op(r, Region.Op.INTERSECT);
          } else {
              region.op(db, Region.Op.DIFFERENCE);
          }
      }
  
      private void checkForLongClick(long delay, float x, float y, int classification) {
          if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE || (mViewFlags & TOOLTIP) == TOOLTIP) {
              mHasPerformedLongPress = false;
  
              if (mPendingCheckForLongPress == null) {
                  mPendingCheckForLongPress = new CheckForLongPress();
              }
              mPendingCheckForLongPress.setAnchor(x, y);
              mPendingCheckForLongPress.rememberWindowAttachCount();
              mPendingCheckForLongPress.rememberPressedState();
              mPendingCheckForLongPress.setClassification(classification);
              postDelayed(mPendingCheckForLongPress, delay);
          }
      }
  
      /**
       * Inflate a view from an XML resource.  This convenience method wraps the {@link
       * LayoutInflater} class, which provides a full range of options for view inflation.
       *
       * @param context The Context object for your activity or application.
       * @param resource The resource ID to inflate
       * @param root A view group that will be the parent.  Used to properly inflate the
       * layout_* parameters.
       * @see LayoutInflater
       */
      public static View inflate(Context context, @LayoutRes int resource, ViewGroup root) {
          LayoutInflater factory = LayoutInflater.from(context);
          return factory.inflate(resource, root);
      }
  
      /**
       * Scroll the view with standard behavior for scrolling beyond the normal
       * content boundaries. Views that call this method should override
       * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the
       * results of an over-scroll operation.
       *
       * Views can use this method to handle any touch or fling-based scrolling.
       *
       * @param deltaX Change in X in pixels
       * @param deltaY Change in Y in pixels
       * @param scrollX Current X scroll value in pixels before applying deltaX
       * @param scrollY Current Y scroll value in pixels before applying deltaY
       * @param scrollRangeX Maximum content scroll range along the X axis
       * @param scrollRangeY Maximum content scroll range along the Y axis
       * @param maxOverScrollX Number of pixels to overscroll by in either direction
       *          along the X axis.
       * @param maxOverScrollY Number of pixels to overscroll by in either direction
       *          along the Y axis.
       * @param isTouchEvent true if this scroll operation is the result of a touch event.
       * @return true if scrolling was clamped to an over-scroll boundary along either
       *          axis, false otherwise.
       */
      @SuppressWarnings({"UnusedParameters"})
      protected boolean overScrollBy(int deltaX, int deltaY,
              int scrollX, int scrollY,
              int scrollRangeX, int scrollRangeY,
              int maxOverScrollX, int maxOverScrollY,
              boolean isTouchEvent) {
          final int overScrollMode = mOverScrollMode;
          final boolean canScrollHorizontal =
                  computeHorizontalScrollRange() > computeHorizontalScrollExtent();
          final boolean canScrollVertical =
                  computeVerticalScrollRange() > computeVerticalScrollExtent();
          final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS ||
                  (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal);
          final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS ||
                  (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical);
  
          int newScrollX = scrollX + deltaX;
          if (!overScrollHorizontal) {
              maxOverScrollX = 0;
          }
  
          int newScrollY = scrollY + deltaY;
          if (!overScrollVertical) {
              maxOverScrollY = 0;
          }
  
          // Clamp values if at the limits and record
          final int left = -maxOverScrollX;
          final int right = maxOverScrollX + scrollRangeX;
          final int top = -maxOverScrollY;
          final int bottom = maxOverScrollY + scrollRangeY;
  
          boolean clampedX = false;
          if (newScrollX > right) {
              newScrollX = right;
              clampedX = true;
          } else if (newScrollX < left) {
              newScrollX = left;
              clampedX = true;
          }
  
          boolean clampedY = false;
          if (newScrollY > bottom) {
              newScrollY = bottom;
              clampedY = true;
          } else if (newScrollY < top) {
              newScrollY = top;
              clampedY = true;
          }
  
          onOverScrolled(newScrollX, newScrollY, clampedX, clampedY);
  
          return clampedX || clampedY;
      }
  
      /**
       * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to
       * respond to the results of an over-scroll operation.
       *
       * @param scrollX New X scroll value in pixels
       * @param scrollY New Y scroll value in pixels
       * @param clampedX True if scrollX was clamped to an over-scroll boundary
       * @param clampedY True if scrollY was clamped to an over-scroll boundary
       */
      protected void onOverScrolled(int scrollX, int scrollY,
              boolean clampedX, boolean clampedY) {
          // Intentionally empty.
      }
  
      /**
       * Returns the over-scroll mode for this view. The result will be
       * one of {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}
       * (allow over-scrolling only if the view content is larger than the container),
       * or {@link #OVER_SCROLL_NEVER}.
       *
       * @return This view's over-scroll mode.
       */
      @InspectableProperty(enumMapping = {
              @EnumEntry(value = OVER_SCROLL_ALWAYS, name = "always"),
              @EnumEntry(value = OVER_SCROLL_IF_CONTENT_SCROLLS, name = "ifContentScrolls"),
              @EnumEntry(value = OVER_SCROLL_NEVER, name = "never")
      })
      public int getOverScrollMode() {
          return mOverScrollMode;
      }
  
      /**
       * Set the over-scroll mode for this view. Valid over-scroll modes are
       * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}
       * (allow over-scrolling only if the view content is larger than the container),
       * or {@link #OVER_SCROLL_NEVER}.
       *
       * Setting the over-scroll mode of a view will have an effect only if the
       * view is capable of scrolling.
       *
       * @param overScrollMode The new over-scroll mode for this view.
       */
      public void setOverScrollMode(int overScrollMode) {
          if (overScrollMode != OVER_SCROLL_ALWAYS &&
                  overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS &&
                  overScrollMode != OVER_SCROLL_NEVER) {
              throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode);
          }
          mOverScrollMode = overScrollMode;
      }
  
      /**
       * Enable or disable nested scrolling for this view.
       *
       * <p>If this property is set to true the view will be permitted to initiate nested
       * scrolling operations with a compatible parent view in the current hierarchy. If this
       * view does not implement nested scrolling this will have no effect. Disabling nested scrolling
       * while a nested scroll is in progress has the effect of {@link #stopNestedScroll() stopping}
       * the nested scroll.</p>
       *
       * @param enabled true to enable nested scrolling, false to disable
       *
       * @see #isNestedScrollingEnabled()
       */
      public void setNestedScrollingEnabled(boolean enabled) {
          if (enabled) {
              mPrivateFlags3 |= PFLAG3_NESTED_SCROLLING_ENABLED;
          } else {
              stopNestedScroll();
              mPrivateFlags3 &= ~PFLAG3_NESTED_SCROLLING_ENABLED;
          }
      }
  
      /**
       * Returns true if nested scrolling is enabled for this view.
       *
       * <p>If nested scrolling is enabled and this View class implementation supports it,
       * this view will act as a nested scrolling child view when applicable, forwarding data
       * about the scroll operation in progress to a compatible and cooperating nested scrolling
       * parent.</p>
       *
       * @return true if nested scrolling is enabled
       *
       * @see #setNestedScrollingEnabled(boolean)
       */
      @InspectableProperty
      public boolean isNestedScrollingEnabled() {
          return (mPrivateFlags3 & PFLAG3_NESTED_SCROLLING_ENABLED) ==
                  PFLAG3_NESTED_SCROLLING_ENABLED;
      }
  
      /**
       * Begin a nestable scroll operation along the given axes.
       *
       * <p>A view starting a nested scroll promises to abide by the following contract:</p>
       *
       * <p>The view will call startNestedScroll upon initiating a scroll operation. In the case
       * of a touch scroll this corresponds to the initial {@link MotionEvent#ACTION_DOWN}.
       * In the case of touch scrolling the nested scroll will be terminated automatically in
       * the same manner as {@link ViewParent#requestDisallowInterceptTouchEvent(boolean)}.
       * In the event of programmatic scrolling the caller must explicitly call
       * {@link #stopNestedScroll()} to indicate the end of the nested scroll.</p>
       *
       * <p>If <code>startNestedScroll</code> returns true, a cooperative parent was found.
       * If it returns false the caller may ignore the rest of this contract until the next scroll.
       * Calling startNestedScroll while a nested scroll is already in progress will return true.</p>
       *
       * <p>At each incremental step of the scroll the caller should invoke
       * {@link #dispatchNestedPreScroll(int, int, int[], int[]) dispatchNestedPreScroll}
       * once it has calculated the requested scrolling delta. If it returns true the nested scrolling
       * parent at least partially consumed the scroll and the caller should adjust the amount it
       * scrolls by.</p>
       *
       * <p>After applying the remainder of the scroll delta the caller should invoke
       * {@link #dispatchNestedScroll(int, int, int, int, int[]) dispatchNestedScroll}, passing
       * both the delta consumed and the delta unconsumed. A nested scrolling parent may treat
       * these values differently. See {@link ViewParent#onNestedScroll(View, int, int, int, int)}.
       * </p>
       *
       * @param axes Flags consisting of a combination of {@link #SCROLL_AXIS_HORIZONTAL} and/or
       *             {@link #SCROLL_AXIS_VERTICAL}.
       * @return true if a cooperative parent was found and nested scrolling has been enabled for
       *         the current gesture.
       *
       * @see #stopNestedScroll()
       * @see #dispatchNestedPreScroll(int, int, int[], int[])
       * @see #dispatchNestedScroll(int, int, int, int, int[])
       */
      public boolean startNestedScroll(int axes) {
          if (hasNestedScrollingParent()) {
              // Already in progress
              return true;
          }
          if (isNestedScrollingEnabled()) {
              ViewParent p = getParent();
              View child = this;
              while (p != null) {
                  try {
                      if (p.onStartNestedScroll(child, this, axes)) {
                          mNestedScrollingParent = p;
                          p.onNestedScrollAccepted(child, this, axes);
                          return true;
                      }
                  } catch (AbstractMethodError e) {
                      Log.e(VIEW_LOG_TAG, "ViewParent " + p + " does not implement interface " +
                              "method onStartNestedScroll", e);
                      // Allow the search upward to continue
                  }
                  if (p instanceof View) {
                      child = (View) p;
                  }
                  p = p.getParent();
              }
          }
          return false;
      }
  
      /**
       * Stop a nested scroll in progress.
       *
       * <p>Calling this method when a nested scroll is not currently in progress is harmless.</p>
       *
       * @see #startNestedScroll(int)
       */
      public void stopNestedScroll() {
          if (mNestedScrollingParent != null) {
              mNestedScrollingParent.onStopNestedScroll(this);
              mNestedScrollingParent = null;
          }
      }
  
      /**
       * Returns true if this view has a nested scrolling parent.
       *
       * <p>The presence of a nested scrolling parent indicates that this view has initiated
       * a nested scroll and it was accepted by an ancestor view further up the view hierarchy.</p>
       *
       * @return whether this view has a nested scrolling parent
       */
      public boolean hasNestedScrollingParent() {
          return mNestedScrollingParent != null;
      }
  
      /**
       * Dispatch one step of a nested scroll in progress.
       *
       * <p>Implementations of views that support nested scrolling should call this to report
       * info about a scroll in progress to the current nested scrolling parent. If a nested scroll
       * is not currently in progress or nested scrolling is not
       * {@link #isNestedScrollingEnabled() enabled} for this view this method does nothing.</p>
       *
       * <p>Compatible View implementations should also call
       * {@link #dispatchNestedPreScroll(int, int, int[], int[]) dispatchNestedPreScroll} before
       * consuming a component of the scroll event themselves.</p>
       *
       * @param dxConsumed Horizontal distance in pixels consumed by this view during this scroll step
       * @param dyConsumed Vertical distance in pixels consumed by this view during this scroll step
       * @param dxUnconsumed Horizontal scroll distance in pixels not consumed by this view
       * @param dyUnconsumed Horizontal scroll distance in pixels not consumed by this view
       * @param offsetInWindow Optional. If not null, on return this will contain the offset
       *                       in local view coordinates of this view from before this operation
       *                       to after it completes. View implementations may use this to adjust
       *                       expected input coordinate tracking.
       * @return true if the event was dispatched, false if it could not be dispatched.
       * @see #dispatchNestedPreScroll(int, int, int[], int[])
       */
      public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed,
              int dxUnconsumed, int dyUnconsumed, @Nullable @Size(2) int[] offsetInWindow) {
          if (isNestedScrollingEnabled() && mNestedScrollingParent != null) {
              if (dxConsumed != 0 || dyConsumed != 0 || dxUnconsumed != 0 || dyUnconsumed != 0) {
                  int startX = 0;
                  int startY = 0;
                  if (offsetInWindow != null) {
                      getLocationInWindow(offsetInWindow);
                      startX = offsetInWindow[0];
                      startY = offsetInWindow[1];
                  }
  
                  mNestedScrollingParent.onNestedScroll(this, dxConsumed, dyConsumed,
                          dxUnconsumed, dyUnconsumed);
  
                  if (offsetInWindow != null) {
                      getLocationInWindow(offsetInWindow);
                      offsetInWindow[0] -= startX;
                      offsetInWindow[1] -= startY;
                  }
                  return true;
              } else if (offsetInWindow != null) {
                  // No motion, no dispatch. Keep offsetInWindow up to date.
                  offsetInWindow[0] = 0;
                  offsetInWindow[1] = 0;
              }
          }
          return false;
      }
  
      /**
       * Dispatch one step of a nested scroll in progress before this view consumes any portion of it.
       *
       * <p>Nested pre-scroll events are to nested scroll events what touch intercept is to touch.
       * <code>dispatchNestedPreScroll</code> offers an opportunity for the parent view in a nested
       * scrolling operation to consume some or all of the scroll operation before the child view
       * consumes it.</p>
       *
       * @param dx Horizontal scroll distance in pixels
       * @param dy Vertical scroll distance in pixels
       * @param consumed Output. If not null, consumed[0] will contain the consumed component of dx
       *                 and consumed[1] the consumed dy.
       * @param offsetInWindow Optional. If not null, on return this will contain the offset
       *                       in local view coordinates of this view from before this operation
       *                       to after it completes. View implementations may use this to adjust
       *                       expected input coordinate tracking.
       * @return true if the parent consumed some or all of the scroll delta
       * @see #dispatchNestedScroll(int, int, int, int, int[])
       */
      public boolean dispatchNestedPreScroll(int dx, int dy,
              @Nullable @Size(2) int[] consumed, @Nullable @Size(2) int[] offsetInWindow) {
          if (isNestedScrollingEnabled() && mNestedScrollingParent != null) {
              if (dx != 0 || dy != 0) {
                  int startX = 0;
                  int startY = 0;
                  if (offsetInWindow != null) {
                      getLocationInWindow(offsetInWindow);
                      startX = offsetInWindow[0];
                      startY = offsetInWindow[1];
                  }
  
                  if (consumed == null) {
                      if (mTempNestedScrollConsumed == null) {
                          mTempNestedScrollConsumed = new int[2];
                      }
                      consumed = mTempNestedScrollConsumed;
                  }
                  consumed[0] = 0;
                  consumed[1] = 0;
                  mNestedScrollingParent.onNestedPreScroll(this, dx, dy, consumed);
  
                  if (offsetInWindow != null) {
                      getLocationInWindow(offsetInWindow);
                      offsetInWindow[0] -= startX;
                      offsetInWindow[1] -= startY;
                  }
                  return consumed[0] != 0 || consumed[1] != 0;
              } else if (offsetInWindow != null) {
                  offsetInWindow[0] = 0;
                  offsetInWindow[1] = 0;
              }
          }
          return false;
      }
  
      /**
       * Dispatch a fling to a nested scrolling parent.
       *
       * <p>This method should be used to indicate that a nested scrolling child has detected
       * suitable conditions for a fling. Generally this means that a touch scroll has ended with a
       * {@link VelocityTracker velocity} in the direction of scrolling that meets or exceeds
       * the {@link ViewConfiguration#getScaledMinimumFlingVelocity() minimum fling velocity}
       * along a scrollable axis.</p>
       *
       * <p>If a nested scrolling child view would normally fling but it is at the edge of
       * its own content, it can use this method to delegate the fling to its nested scrolling
       * parent instead. The parent may optionally consume the fling or observe a child fling.</p>
       *
       * @param velocityX Horizontal fling velocity in pixels per second
       * @param velocityY Vertical fling velocity in pixels per second
       * @param consumed true if the child consumed the fling, false otherwise
       * @return true if the nested scrolling parent consumed or otherwise reacted to the fling
       */
      public boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed) {
          if (isNestedScrollingEnabled() && mNestedScrollingParent != null) {
              return mNestedScrollingParent.onNestedFling(this, velocityX, velocityY, consumed);
          }
          return false;
      }
  
      /**
       * Dispatch a fling to a nested scrolling parent before it is processed by this view.
       *
       * <p>Nested pre-fling events are to nested fling events what touch intercept is to touch
       * and what nested pre-scroll is to nested scroll. <code>dispatchNestedPreFling</code>
       * offsets an opportunity for the parent view in a nested fling to fully consume the fling
       * before the child view consumes it. If this method returns <code>true</code>, a nested
       * parent view consumed the fling and this view should not scroll as a result.</p>
       *
       * <p>For a better user experience, only one view in a nested scrolling chain should consume
       * the fling at a time. If a parent view consumed the fling this method will return false.
       * Custom view implementations should account for this in two ways:</p>
       *
       * <ul>
       *     <li>If a custom view is paged and needs to settle to a fixed page-point, do not
       *     call <code>dispatchNestedPreFling</code>; consume the fling and settle to a valid
       *     position regardless.</li>
       *     <li>If a nested parent does consume the fling, this view should not scroll at all,
       *     even to settle back to a valid idle position.</li>
       * </ul>
       *
       * <p>Views should also not offer fling velocities to nested parent views along an axis
       * where scrolling is not currently supported; a {@link android.widget.ScrollView ScrollView}
       * should not offer a horizontal fling velocity to its parents since scrolling along that
       * axis is not permitted and carrying velocity along that motion does not make sense.</p>
       *
       * @param velocityX Horizontal fling velocity in pixels per second
       * @param velocityY Vertical fling velocity in pixels per second
       * @return true if a nested scrolling parent consumed the fling
       */
      public boolean dispatchNestedPreFling(float velocityX, float velocityY) {
          if (isNestedScrollingEnabled() && mNestedScrollingParent != null) {
              return mNestedScrollingParent.onNestedPreFling(this, velocityX, velocityY);
          }
          return false;
      }
  
      /**
       * Gets a scale factor that determines the distance the view should scroll
       * vertically in response to {@link MotionEvent#ACTION_SCROLL}.
       * @return The vertical scroll scale factor.
       * @hide
       */
      @UnsupportedAppUsage
      protected float getVerticalScrollFactor() {
          if (mVerticalScrollFactor == 0) {
              TypedValue outValue = new TypedValue();
              if (!mContext.getTheme().resolveAttribute(
                      com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) {
                  throw new IllegalStateException(
                          "Expected theme to define listPreferredItemHeight.");
              }
              mVerticalScrollFactor = outValue.getDimension(
                      mContext.getResources().getDisplayMetrics());
          }
          return mVerticalScrollFactor;
      }
  
      /**
       * Gets a scale factor that determines the distance the view should scroll
       * horizontally in response to {@link MotionEvent#ACTION_SCROLL}.
       * @return The horizontal scroll scale factor.
       * @hide
       */
      @UnsupportedAppUsage
      protected float getHorizontalScrollFactor() {
          // TODO: Should use something else.
          return getVerticalScrollFactor();
      }
  
      /**
       * Return the value specifying the text direction or policy that was set with
       * {@link #setTextDirection(int)}.
       *
       * @return the defined text direction. It can be one of:
       *
       * {@link #TEXT_DIRECTION_INHERIT},
       * {@link #TEXT_DIRECTION_FIRST_STRONG},
       * {@link #TEXT_DIRECTION_ANY_RTL},
       * {@link #TEXT_DIRECTION_LTR},
       * {@link #TEXT_DIRECTION_RTL},
       * {@link #TEXT_DIRECTION_LOCALE},
       * {@link #TEXT_DIRECTION_FIRST_STRONG_LTR},
       * {@link #TEXT_DIRECTION_FIRST_STRONG_RTL}
       *
       * @attr ref android.R.styleable#View_textDirection
       *
       * @hide
       */
      @ViewDebug.ExportedProperty(category = "text", mapping = {
              @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"),
              @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"),
              @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"),
              @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"),
              @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"),
              @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE"),
              @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG_LTR, to = "FIRST_STRONG_LTR"),
              @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG_RTL, to = "FIRST_STRONG_RTL")
      })
      @InspectableProperty(hasAttributeId = false, enumMapping = {
              @EnumEntry(value = TEXT_DIRECTION_INHERIT, name = "inherit"),
              @EnumEntry(value = TEXT_DIRECTION_LOCALE, name = "locale"),
              @EnumEntry(value = TEXT_DIRECTION_ANY_RTL, name = "anyRtl"),
              @EnumEntry(value = TEXT_DIRECTION_LTR, name = "ltr"),
              @EnumEntry(value = TEXT_DIRECTION_RTL, name = "rtl"),
              @EnumEntry(value = TEXT_DIRECTION_FIRST_STRONG, name = "firstStrong"),
              @EnumEntry(value = TEXT_DIRECTION_FIRST_STRONG_LTR, name = "firstStrongLtr"),
              @EnumEntry(value = TEXT_DIRECTION_FIRST_STRONG_RTL, name = "firstStrongRtl"),
      })
      @UnsupportedAppUsage
      public int getRawTextDirection() {
          return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_MASK) >> PFLAG2_TEXT_DIRECTION_MASK_SHIFT;
      }
  
      /**
       * Set the text direction.
       *
       * @param textDirection the direction to set. Should be one of:
       *
       * {@link #TEXT_DIRECTION_INHERIT},
       * {@link #TEXT_DIRECTION_FIRST_STRONG},
       * {@link #TEXT_DIRECTION_ANY_RTL},
       * {@link #TEXT_DIRECTION_LTR},
       * {@link #TEXT_DIRECTION_RTL},
       * {@link #TEXT_DIRECTION_LOCALE}
       * {@link #TEXT_DIRECTION_FIRST_STRONG_LTR},
       * {@link #TEXT_DIRECTION_FIRST_STRONG_RTL},
       *
       * Resolution will be done if the value is set to TEXT_DIRECTION_INHERIT. The resolution
       * proceeds up the parent chain of the view to get the value. If there is no parent, then it will
       * return the default {@link #TEXT_DIRECTION_FIRST_STRONG}.
       *
       * @attr ref android.R.styleable#View_textDirection
       */
      public void setTextDirection(int textDirection) {
          if (getRawTextDirection() != textDirection) {
              // Reset the current text direction and the resolved one
              mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK;
              resetResolvedTextDirection();
              // Set the new text direction
              mPrivateFlags2 |= ((textDirection << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) & PFLAG2_TEXT_DIRECTION_MASK);
              // Do resolution
              resolveTextDirection();
              // Notify change
              onRtlPropertiesChanged(getLayoutDirection());
              // Refresh
              requestLayout();
              invalidate(true);
          }
      }
  
      /**
       * Return the resolved text direction.
       *
       * @return the resolved text direction. Returns one of:
       *
       * {@link #TEXT_DIRECTION_FIRST_STRONG},
       * {@link #TEXT_DIRECTION_ANY_RTL},
       * {@link #TEXT_DIRECTION_LTR},
       * {@link #TEXT_DIRECTION_RTL},
       * {@link #TEXT_DIRECTION_LOCALE},
       * {@link #TEXT_DIRECTION_FIRST_STRONG_LTR},
       * {@link #TEXT_DIRECTION_FIRST_STRONG_RTL}
       *
       * @attr ref android.R.styleable#View_textDirection
       */
      @ViewDebug.ExportedProperty(category = "text", mapping = {
              @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"),
              @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"),
              @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"),
              @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"),
              @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"),
              @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE"),
              @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG_LTR, to = "FIRST_STRONG_LTR"),
              @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG_RTL, to = "FIRST_STRONG_RTL")
      })
      @InspectableProperty(hasAttributeId = false, enumMapping = {
              @EnumEntry(value = TEXT_DIRECTION_LOCALE, name = "locale"),
              @EnumEntry(value = TEXT_DIRECTION_ANY_RTL, name = "anyRtl"),
              @EnumEntry(value = TEXT_DIRECTION_LTR, name = "ltr"),
              @EnumEntry(value = TEXT_DIRECTION_RTL, name = "rtl"),
              @EnumEntry(value = TEXT_DIRECTION_FIRST_STRONG, name = "firstStrong"),
              @EnumEntry(value = TEXT_DIRECTION_FIRST_STRONG_LTR, name = "firstStrongLtr"),
              @EnumEntry(value = TEXT_DIRECTION_FIRST_STRONG_RTL, name = "firstStrongRtl"),
      })
      public int getTextDirection() {
          return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED_MASK) >> PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT;
      }
  
      /**
       * Resolve the text direction.
       *
       * @return true if resolution has been done, false otherwise.
       *
       * @hide
       */
      public boolean resolveTextDirection() {
          // Reset any previous text direction resolution
          mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK);
  
          if (hasRtlSupport()) {
              // Set resolved text direction flag depending on text direction flag
              final int textDirection = getRawTextDirection();
              switch(textDirection) {
                  case TEXT_DIRECTION_INHERIT:
                      if (!canResolveTextDirection()) {
                          // We cannot do the resolution if there is no parent, so use the default one
                          mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
                          // Resolution will need to happen again later
                          return false;
                      }
  
                      // Parent has not yet resolved, so we still return the default
                      try {
                          if (!mParent.isTextDirectionResolved()) {
                              mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
                              // Resolution will need to happen again later
                              return false;
                          }
                      } catch (AbstractMethodError e) {
                          Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
                                  " does not fully implement ViewParent", e);
                          mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED |
                                  PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
                          return true;
                      }
  
                      // Set current resolved direction to the same value as the parent's one
                      int parentResolvedDirection;
                      try {
                          parentResolvedDirection = mParent.getTextDirection();
                      } catch (AbstractMethodError e) {
                          Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
                                  " does not fully implement ViewParent", e);
                          parentResolvedDirection = TEXT_DIRECTION_LTR;
                      }
                      switch (parentResolvedDirection) {
                          case TEXT_DIRECTION_FIRST_STRONG:
                          case TEXT_DIRECTION_ANY_RTL:
                          case TEXT_DIRECTION_LTR:
                          case TEXT_DIRECTION_RTL:
                          case TEXT_DIRECTION_LOCALE:
                          case TEXT_DIRECTION_FIRST_STRONG_LTR:
                          case TEXT_DIRECTION_FIRST_STRONG_RTL:
                              mPrivateFlags2 |=
                                      (parentResolvedDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT);
                              break;
                          default:
                              // Default resolved direction is "first strong" heuristic
                              mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
                      }
                      break;
                  case TEXT_DIRECTION_FIRST_STRONG:
                  case TEXT_DIRECTION_ANY_RTL:
                  case TEXT_DIRECTION_LTR:
                  case TEXT_DIRECTION_RTL:
                  case TEXT_DIRECTION_LOCALE:
                  case TEXT_DIRECTION_FIRST_STRONG_LTR:
                  case TEXT_DIRECTION_FIRST_STRONG_RTL:
                      // Resolved direction is the same as text direction
                      mPrivateFlags2 |= (textDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT);
                      break;
                  default:
                      // Default resolved direction is "first strong" heuristic
                      mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
              }
          } else {
              // Default resolved direction is "first strong" heuristic
              mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
          }
  
          // Set to resolved
          mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED;
          return true;
      }
  
      /**
       * Check if text direction resolution can be done.
       *
       * @return true if text direction resolution can be done otherwise return false.
       */
      public boolean canResolveTextDirection() {
          switch (getRawTextDirection()) {
              case TEXT_DIRECTION_INHERIT:
                  if (mParent != null) {
                      try {
                          return mParent.canResolveTextDirection();
                      } catch (AbstractMethodError e) {
                          Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
                                  " does not fully implement ViewParent", e);
                      }
                  }
                  return false;
  
              default:
                  return true;
          }
      }
  
      /**
       * Reset resolved text direction. Text direction will be resolved during a call to
       * {@link #onMeasure(int, int)}.
       *
       * @hide
       */
      @TestApi
      public void resetResolvedTextDirection() {
          // Reset any previous text direction resolution
          mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK);
          // Set to default value
          mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
      }
  
      /**
       * @return true if text direction is inherited.
       *
       * @hide
       */
      public boolean isTextDirectionInherited() {
          return (getRawTextDirection() == TEXT_DIRECTION_INHERIT);
      }
  
      /**
       * @return true if text direction is resolved.
       */
      public boolean isTextDirectionResolved() {
          return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED) == PFLAG2_TEXT_DIRECTION_RESOLVED;
      }
  
      /**
       * Return the value specifying the text alignment or policy that was set with
       * {@link #setTextAlignment(int)}.
       *
       * @return the defined text alignment. It can be one of:
       *
       * {@link #TEXT_ALIGNMENT_INHERIT},
       * {@link #TEXT_ALIGNMENT_GRAVITY},
       * {@link #TEXT_ALIGNMENT_CENTER},
       * {@link #TEXT_ALIGNMENT_TEXT_START},
       * {@link #TEXT_ALIGNMENT_TEXT_END},
       * {@link #TEXT_ALIGNMENT_VIEW_START},
       * {@link #TEXT_ALIGNMENT_VIEW_END}
       *
       * @attr ref android.R.styleable#View_textAlignment
       *
       * @hide
       */
      @ViewDebug.ExportedProperty(category = "text", mapping = {
              @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"),
              @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"),
              @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"),
              @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"),
              @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"),
              @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"),
              @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END")
      })
      @InspectableProperty(hasAttributeId = false, enumMapping = {
              @EnumEntry(value = TEXT_ALIGNMENT_INHERIT, name = "inherit"),
              @EnumEntry(value = TEXT_ALIGNMENT_GRAVITY, name = "gravity"),
              @EnumEntry(value = TEXT_ALIGNMENT_TEXT_START, name = "textStart"),
              @EnumEntry(value = TEXT_ALIGNMENT_TEXT_END, name = "textEnd"),
              @EnumEntry(value = TEXT_ALIGNMENT_CENTER, name = "center"),
              @EnumEntry(value = TEXT_ALIGNMENT_VIEW_START, name = "viewStart"),
              @EnumEntry(value = TEXT_ALIGNMENT_VIEW_END, name = "viewEnd")
      })
      @TextAlignment
      @UnsupportedAppUsage
      public int getRawTextAlignment() {
          return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_MASK) >> PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT;
      }
  
      /**
       * Set the text alignment.
       *
       * @param textAlignment The text alignment to set. Should be one of
       *
       * {@link #TEXT_ALIGNMENT_INHERIT},
       * {@link #TEXT_ALIGNMENT_GRAVITY},
       * {@link #TEXT_ALIGNMENT_CENTER},
       * {@link #TEXT_ALIGNMENT_TEXT_START},
       * {@link #TEXT_ALIGNMENT_TEXT_END},
       * {@link #TEXT_ALIGNMENT_VIEW_START},
       * {@link #TEXT_ALIGNMENT_VIEW_END}
       *
       * Resolution will be done if the value is set to TEXT_ALIGNMENT_INHERIT. The resolution
       * proceeds up the parent chain of the view to get the value. If there is no parent, then it
       * will return the default {@link #TEXT_ALIGNMENT_GRAVITY}.
       *
       * @attr ref android.R.styleable#View_textAlignment
       */
      public void setTextAlignment(@TextAlignment int textAlignment) {
          if (textAlignment != getRawTextAlignment()) {
              // Reset the current and resolved text alignment
              mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK;
              resetResolvedTextAlignment();
              // Set the new text alignment
              mPrivateFlags2 |=
                      ((textAlignment << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) & PFLAG2_TEXT_ALIGNMENT_MASK);
              // Do resolution
              resolveTextAlignment();
              // Notify change
              onRtlPropertiesChanged(getLayoutDirection());
              // Refresh
              requestLayout();
              invalidate(true);
          }
      }
  
      /**
       * Return the resolved text alignment.
       *
       * @return the resolved text alignment. Returns one of:
       *
       * {@link #TEXT_ALIGNMENT_GRAVITY},
       * {@link #TEXT_ALIGNMENT_CENTER},
       * {@link #TEXT_ALIGNMENT_TEXT_START},
       * {@link #TEXT_ALIGNMENT_TEXT_END},
       * {@link #TEXT_ALIGNMENT_VIEW_START},
       * {@link #TEXT_ALIGNMENT_VIEW_END}
       *
       * @attr ref android.R.styleable#View_textAlignment
       */
      @ViewDebug.ExportedProperty(category = "text", mapping = {
              @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"),
              @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"),
              @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"),
              @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"),
              @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"),
              @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"),
              @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END")
      })
      @InspectableProperty(enumMapping = {
              @EnumEntry(value = TEXT_ALIGNMENT_GRAVITY, name = "gravity"),
              @EnumEntry(value = TEXT_ALIGNMENT_TEXT_START, name = "textStart"),
              @EnumEntry(value = TEXT_ALIGNMENT_TEXT_END, name = "textEnd"),
              @EnumEntry(value = TEXT_ALIGNMENT_CENTER, name = "center"),
              @EnumEntry(value = TEXT_ALIGNMENT_VIEW_START, name = "viewStart"),
              @EnumEntry(value = TEXT_ALIGNMENT_VIEW_END, name = "viewEnd")
      })
      @TextAlignment
      public int getTextAlignment() {
          return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK) >>
                  PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT;
      }
  
      /**
       * Resolve the text alignment.
       *
       * @return true if resolution has been done, false otherwise.
       *
       * @hide
       */
      public boolean resolveTextAlignment() {
          // Reset any previous text alignment resolution
          mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK);
  
          if (hasRtlSupport()) {
              // Set resolved text alignment flag depending on text alignment flag
              final int textAlignment = getRawTextAlignment();
              switch (textAlignment) {
                  case TEXT_ALIGNMENT_INHERIT:
                      // Check if we can resolve the text alignment
                      if (!canResolveTextAlignment()) {
                          // We cannot do the resolution if there is no parent so use the default
                          mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
                          // Resolution will need to happen again later
                          return false;
                      }
  
                      // Parent has not yet resolved, so we still return the default
                      try {
                          if (!mParent.isTextAlignmentResolved()) {
                              mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
                              // Resolution will need to happen again later
                              return false;
                          }
                      } catch (AbstractMethodError e) {
                          Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
                                  " does not fully implement ViewParent", e);
                          mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED |
                                  PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
                          return true;
                      }
  
                      int parentResolvedTextAlignment;
                      try {
                          parentResolvedTextAlignment = mParent.getTextAlignment();
                      } catch (AbstractMethodError e) {
                          Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
                                  " does not fully implement ViewParent", e);
                          parentResolvedTextAlignment = TEXT_ALIGNMENT_GRAVITY;
                      }
                      switch (parentResolvedTextAlignment) {
                          case TEXT_ALIGNMENT_GRAVITY:
                          case TEXT_ALIGNMENT_TEXT_START:
                          case TEXT_ALIGNMENT_TEXT_END:
                          case TEXT_ALIGNMENT_CENTER:
                          case TEXT_ALIGNMENT_VIEW_START:
                          case TEXT_ALIGNMENT_VIEW_END:
                              // Resolved text alignment is the same as the parent resolved
                              // text alignment
                              mPrivateFlags2 |=
                                      (parentResolvedTextAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT);
                              break;
                          default:
                              // Use default resolved text alignment
                              mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
                      }
                      break;
                  case TEXT_ALIGNMENT_GRAVITY:
                  case TEXT_ALIGNMENT_TEXT_START:
                  case TEXT_ALIGNMENT_TEXT_END:
                  case TEXT_ALIGNMENT_CENTER:
                  case TEXT_ALIGNMENT_VIEW_START:
                  case TEXT_ALIGNMENT_VIEW_END:
                      // Resolved text alignment is the same as text alignment
                      mPrivateFlags2 |= (textAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT);
                      break;
                  default:
                      // Use default resolved text alignment
                      mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
              }
          } else {
              // Use default resolved text alignment
              mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
          }
  
          // Set the resolved
          mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED;
          return true;
      }
  
      /**
       * Check if text alignment resolution can be done.
       *
       * @return true if text alignment resolution can be done otherwise return false.
       */
      public boolean canResolveTextAlignment() {
          switch (getRawTextAlignment()) {
              case TEXT_DIRECTION_INHERIT:
                  if (mParent != null) {
                      try {
                          return mParent.canResolveTextAlignment();
                      } catch (AbstractMethodError e) {
                          Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
                                  " does not fully implement ViewParent", e);
                      }
                  }
                  return false;
  
              default:
                  return true;
          }
      }
  
      /**
       * Reset resolved text alignment. Text alignment will be resolved during a call to
       * {@link #onMeasure(int, int)}.
       *
       * @hide
       */
      @TestApi
      public void resetResolvedTextAlignment() {
          // Reset any previous text alignment resolution
          mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK);
          // Set to default
          mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
      }
  
      /**
       * @return true if text alignment is inherited.
       *
       * @hide
       */
      public boolean isTextAlignmentInherited() {
          return (getRawTextAlignment() == TEXT_ALIGNMENT_INHERIT);
      }
  
      /**
       * @return true if text alignment is resolved.
       */
      public boolean isTextAlignmentResolved() {
          return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED) == PFLAG2_TEXT_ALIGNMENT_RESOLVED;
      }
  
      /**
       * Generate a value suitable for use in {@link #setId(int)}.
       * This value will not collide with ID values generated at build time by aapt for R.id.
       *
       * @return a generated ID value
       */
      public static int generateViewId() {
          for (;;) {
              final int result = sNextGeneratedId.get();
              // aapt-generated IDs have the high byte nonzero; clamp to the range under that.
              int newValue = result + 1;
              if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0.
              if (sNextGeneratedId.compareAndSet(result, newValue)) {
                  return result;
              }
          }
      }
  
      private static boolean isViewIdGenerated(int id) {
          return (id & 0xFF000000) == 0 && (id & 0x00FFFFFF) != 0;
      }
  
      /**
       * Gets the Views in the hierarchy affected by entering and exiting Activity Scene transitions.
       * @param transitioningViews This View will be added to transitioningViews if it is VISIBLE and
       *                           a normal View or a ViewGroup with
       *                           {@link android.view.ViewGroup#isTransitionGroup()} true.
       * @hide
       */
      public void captureTransitioningViews(List<View> transitioningViews) {
          if (getVisibility() == View.VISIBLE) {
              transitioningViews.add(this);
          }
      }
  
      /**
       * Adds all Views that have {@link #getTransitionName()} non-null to namedElements.
       * @param namedElements Will contain all Views in the hierarchy having a transitionName.
       * @hide
       */
      public void findNamedViews(Map<String, View> namedElements) {
          if (getVisibility() == VISIBLE || mGhostView != null) {
              String transitionName = getTransitionName();
              if (transitionName != null) {
                  namedElements.put(transitionName, this);
              }
          }
      }
  
      /**
       * Returns the pointer icon for the motion event, or null if it doesn't specify the icon.
       * The default implementation does not care the location or event types, but some subclasses
       * may use it (such as WebViews).
       * @param event The MotionEvent from a mouse
       * @param pointerIndex The index of the pointer for which to retrieve the {@link PointerIcon}.
       *                     This will be between 0 and {@link MotionEvent#getPointerCount()}.
       * @see PointerIcon
       */
      public PointerIcon onResolvePointerIcon(MotionEvent event, int pointerIndex) {
          final float x = event.getX(pointerIndex);
          final float y = event.getY(pointerIndex);
          if (isDraggingScrollBar() || isOnScrollbarThumb(x, y)) {
              return PointerIcon.getSystemIcon(mContext, PointerIcon.TYPE_ARROW);
          }
          return mPointerIcon;
      }
  
      /**
       * Set the pointer icon for the current view.
       * Passing {@code null} will restore the pointer icon to its default value.
       * @param pointerIcon A PointerIcon instance which will be shown when the mouse hovers.
       */
      public void setPointerIcon(PointerIcon pointerIcon) {
          mPointerIcon = pointerIcon;
          if (mAttachInfo == null || mAttachInfo.mHandlingPointerEvent) {
              return;
          }
          try {
              mAttachInfo.mSession.updatePointerIcon(mAttachInfo.mWindow);
          } catch (RemoteException e) {
          }
      }
  
      /**
       * Gets the pointer icon for the current view.
       */
      @InspectableProperty
      public PointerIcon getPointerIcon() {
          return mPointerIcon;
      }
  
      /**
       * Checks pointer capture status.
       *
       * @return true if the view has pointer capture.
       * @see #requestPointerCapture()
       * @see #hasPointerCapture()
       */
      public boolean hasPointerCapture() {
          final ViewRootImpl viewRootImpl = getViewRootImpl();
          if (viewRootImpl == null) {
              return false;
          }
          return viewRootImpl.hasPointerCapture();
      }
  
      /**
       * Requests pointer capture mode.
       * <p>
       * When the window has pointer capture, the mouse pointer icon will disappear and will not
       * change its position. Further mouse will be dispatched with the source
       * {@link InputDevice#SOURCE_MOUSE_RELATIVE}, and relative position changes will be available
       * through {@link MotionEvent#getX} and {@link MotionEvent#getY}. Non-mouse events
       * (touchscreens, or stylus) will not be affected.
       * <p>
       * If the window already has pointer capture, this call does nothing.
       * <p>
       * The capture may be released through {@link #releasePointerCapture()}, or will be lost
       * automatically when the window loses focus.
       *
       * @see #releasePointerCapture()
       * @see #hasPointerCapture()
       */
      public void requestPointerCapture() {
          final ViewRootImpl viewRootImpl = getViewRootImpl();
          if (viewRootImpl != null) {
              viewRootImpl.requestPointerCapture(true);
          }
      }
  
  
      /**
       * Releases the pointer capture.
       * <p>
       * If the window does not have pointer capture, this call will do nothing.
       * @see #requestPointerCapture()
       * @see #hasPointerCapture()
       */
      public void releasePointerCapture() {
          final ViewRootImpl viewRootImpl = getViewRootImpl();
          if (viewRootImpl != null) {
              viewRootImpl.requestPointerCapture(false);
          }
      }
  
      /**
       * Called when the window has just acquired or lost pointer capture.
       *
       * @param hasCapture True if the view now has pointerCapture, false otherwise.
       */
      @CallSuper
      public void onPointerCaptureChange(boolean hasCapture) {
      }
  
      /**
       * @see #onPointerCaptureChange
       */
      public void dispatchPointerCaptureChanged(boolean hasCapture) {
          onPointerCaptureChange(hasCapture);
      }
  
      /**
       * Implement this method to handle captured pointer events
       *
       * @param event The captured pointer event.
       * @return True if the event was handled, false otherwise.
       * @see #requestPointerCapture()
       */
      public boolean onCapturedPointerEvent(MotionEvent event) {
          return false;
      }
  
      /**
       * Interface definition for a callback to be invoked when a captured pointer event
       * is being dispatched this view. The callback will be invoked before the event is
       * given to the view.
       */
      public interface OnCapturedPointerListener {
          /**
           * Called when a captured pointer event is dispatched to a view.
           * @param view The view this event has been dispatched to.
           * @param event The captured event.
           * @return True if the listener has consumed the event, false otherwise.
           */
          boolean onCapturedPointer(View view, MotionEvent event);
      }
  
      /**
       * Set a listener to receive callbacks when the pointer capture state of a view changes.
       * @param l  The {@link OnCapturedPointerListener} to receive callbacks.
       */
      public void setOnCapturedPointerListener(OnCapturedPointerListener l) {
          getListenerInfo().mOnCapturedPointerListener = l;
      }
  
      // Properties
      //
      /**
       * A Property wrapper around the <code>alpha</code> functionality handled by the
       * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods.
       */
      public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") {
          @Override
          public void setValue(View object, float value) {
              object.setAlpha(value);
          }
  
          @Override
          public Float get(View object) {
              return object.getAlpha();
          }
      };
  
      /**
       * A Property wrapper around the <code>translationX</code> functionality handled by the
       * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods.
       */
      public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") {
          @Override
          public void setValue(View object, float value) {
              object.setTranslationX(value);
          }
  
                  @Override
          public Float get(View object) {
              return object.getTranslationX();
          }
      };
  
      /**
       * A Property wrapper around the <code>translationY</code> functionality handled by the
       * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods.
       */
      public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") {
          @Override
          public void setValue(View object, float value) {
              object.setTranslationY(value);
          }
  
          @Override
          public Float get(View object) {
              return object.getTranslationY();
          }
      };
  
      /**
       * A Property wrapper around the <code>translationZ</code> functionality handled by the
       * {@link View#setTranslationZ(float)} and {@link View#getTranslationZ()} methods.
       */
      public static final Property<View, Float> TRANSLATION_Z = new FloatProperty<View>("translationZ") {
          @Override
          public void setValue(View object, float value) {
              object.setTranslationZ(value);
          }
  
          @Override
          public Float get(View object) {
              return object.getTranslationZ();
          }
      };
  
      /**
       * A Property wrapper around the <code>x</code> functionality handled by the
       * {@link View#setX(float)} and {@link View#getX()} methods.
       */
      public static final Property<View, Float> X = new FloatProperty<View>("x") {
          @Override
          public void setValue(View object, float value) {
              object.setX(value);
          }
  
          @Override
          public Float get(View object) {
              return object.getX();
          }
      };
  
      /**
       * A Property wrapper around the <code>y</code> functionality handled by the
       * {@link View#setY(float)} and {@link View#getY()} methods.
       */
      public static final Property<View, Float> Y = new FloatProperty<View>("y") {
          @Override
          public void setValue(View object, float value) {
              object.setY(value);
          }
  
          @Override
          public Float get(View object) {
              return object.getY();
          }
      };
  
      /**
       * A Property wrapper around the <code>z</code> functionality handled by the
       * {@link View#setZ(float)} and {@link View#getZ()} methods.
       */
      public static final Property<View, Float> Z = new FloatProperty<View>("z") {
          @Override
          public void setValue(View object, float value) {
              object.setZ(value);
          }
  
          @Override
          public Float get(View object) {
              return object.getZ();
          }
      };
  
      /**
       * A Property wrapper around the <code>rotation</code> functionality handled by the
       * {@link View#setRotation(float)} and {@link View#getRotation()} methods.
       */
      public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") {
          @Override
          public void setValue(View object, float value) {
              object.setRotation(value);
          }
  
          @Override
          public Float get(View object) {
              return object.getRotation();
          }
      };
  
      /**
       * A Property wrapper around the <code>rotationX</code> functionality handled by the
       * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods.
       */
      public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") {
          @Override
          public void setValue(View object, float value) {
              object.setRotationX(value);
          }
  
          @Override
          public Float get(View object) {
              return object.getRotationX();
          }
      };
  
      /**
       * A Property wrapper around the <code>rotationY</code> functionality handled by the
       * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods.
       */
      public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") {
          @Override
          public void setValue(View object, float value) {
              object.setRotationY(value);
          }
  
          @Override
          public Float get(View object) {
              return object.getRotationY();
          }
      };
  
      /**
       * A Property wrapper around the <code>scaleX</code> functionality handled by the
       * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods.
       */
      public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") {
          @Override
          public void setValue(View object, float value) {
              object.setScaleX(value);
          }
  
          @Override
          public Float get(View object) {
              return object.getScaleX();
          }
      };
  
      /**
       * A Property wrapper around the <code>scaleY</code> functionality handled by the
       * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods.
       */
      public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") {
          @Override
          public void setValue(View object, float value) {
              object.setScaleY(value);
          }
  
          @Override
          public Float get(View object) {
              return object.getScaleY();
          }
      };
  
      /**
       * A MeasureSpec encapsulates the layout requirements passed from parent to child.
       * Each MeasureSpec represents a requirement for either the width or the height.
       * A MeasureSpec is comprised of a size and a mode. There are three possible
       * modes:
       * <dl>
       * <dt>UNSPECIFIED</dt>
       * <dd>
       * The parent has not imposed any constraint on the child. It can be whatever size
       * it wants.
       * </dd>
       *
       * <dt>EXACTLY</dt>
       * <dd>
       * The parent has determined an exact size for the child. The child is going to be
       * given those bounds regardless of how big it wants to be.
       * </dd>
       *
       * <dt>AT_MOST</dt>
       * <dd>
       * The child can be as large as it wants up to the specified size.
       * </dd>
       * </dl>
       *
       * MeasureSpecs are implemented as ints to reduce object allocation. This class
       * is provided to pack and unpack the &lt;size, mode&gt; tuple into the int.
       */
      public static class MeasureSpec {
          private static final int MODE_SHIFT = 30;
          private static final int MODE_MASK  = 0x3 << MODE_SHIFT;
  
          /** @hide */
          @IntDef({UNSPECIFIED, EXACTLY, AT_MOST})
          @Retention(RetentionPolicy.SOURCE)
          public @interface MeasureSpecMode {}
  
          /**
           * Measure specification mode: The parent has not imposed any constraint
           * on the child. It can be whatever size it wants.
           */
          public static final int UNSPECIFIED = 0 << MODE_SHIFT;
  
          /**
           * Measure specification mode: The parent has determined an exact size
           * for the child. The child is going to be given those bounds regardless
           * of how big it wants to be.
           */
          public static final int EXACTLY     = 1 << MODE_SHIFT;
  
          /**
           * Measure specification mode: The child can be as large as it wants up
           * to the specified size.
           */
          public static final int AT_MOST     = 2 << MODE_SHIFT;
  
          /**
           * Creates a measure specification based on the supplied size and mode.
           *
           * The mode must always be one of the following:
           * <ul>
           *  <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li>
           *  <li>{@link android.view.View.MeasureSpec#EXACTLY}</li>
           *  <li>{@link android.view.View.MeasureSpec#AT_MOST}</li>
           * </ul>
           *
           * <p><strong>Note:</strong> On API level 17 and lower, makeMeasureSpec's
           * implementation was such that the order of arguments did not matter
           * and overflow in either value could impact the resulting MeasureSpec.
           * {@link android.widget.RelativeLayout} was affected by this bug.
           * Apps targeting API levels greater than 17 will get the fixed, more strict
           * behavior.</p>
           *
           * @param size the size of the measure specification
           * @param mode the mode of the measure specification
           * @return the measure specification based on size and mode
           */
          public static int makeMeasureSpec(@IntRange(from = 0, to = (1 << MeasureSpec.MODE_SHIFT) - 1) int size,
                                            @MeasureSpecMode int mode) {
              if (sUseBrokenMakeMeasureSpec) {
                  return size + mode;
              } else {
                  return (size & ~MODE_MASK) | (mode & MODE_MASK);
              }
          }
  
          /**
           * Like {@link #makeMeasureSpec(int, int)}, but any spec with a mode of UNSPECIFIED
           * will automatically get a size of 0. Older apps expect this.
           *
           * @hide internal use only for compatibility with system widgets and older apps
           */
          @UnsupportedAppUsage
          public static int makeSafeMeasureSpec(int size, int mode) {
              if (sUseZeroUnspecifiedMeasureSpec && mode == UNSPECIFIED) {
                  return 0;
              }
              return makeMeasureSpec(size, mode);
          }
  
          /**
           * Extracts the mode from the supplied measure specification.
           *
           * @param measureSpec the measure specification to extract the mode from
           * @return {@link android.view.View.MeasureSpec#UNSPECIFIED},
           *         {@link android.view.View.MeasureSpec#AT_MOST} or
           *         {@link android.view.View.MeasureSpec#EXACTLY}
           */
          @MeasureSpecMode
          public static int getMode(int measureSpec) {
              //noinspection ResourceType
              return (measureSpec & MODE_MASK);
          }
  
          /**
           * Extracts the size from the supplied measure specification.
           *
           * @param measureSpec the measure specification to extract the size from
           * @return the size in pixels defined in the supplied measure specification
           */
          public static int getSize(int measureSpec) {
              return (measureSpec & ~MODE_MASK);
          }
  
          static int adjust(int measureSpec, int delta) {
              final int mode = getMode(measureSpec);
              int size = getSize(measureSpec);
              if (mode == UNSPECIFIED) {
                  // No need to adjust size for UNSPECIFIED mode.
                  return makeMeasureSpec(size, UNSPECIFIED);
              }
              size += delta;
              if (size < 0) {
                  Log.e(VIEW_LOG_TAG, "MeasureSpec.adjust: new size would be negative! (" + size +
                          ") spec: " + toString(measureSpec) + " delta: " + delta);
                  size = 0;
              }
              return makeMeasureSpec(size, mode);
          }
  
          /**
           * Returns a String representation of the specified measure
           * specification.
           *
           * @param measureSpec the measure specification to convert to a String
           * @return a String with the following format: "MeasureSpec: MODE SIZE"
           */
          public static String toString(int measureSpec) {
              int mode = getMode(measureSpec);
              int size = getSize(measureSpec);
  
              StringBuilder sb = new StringBuilder("MeasureSpec: ");
  
              if (mode == UNSPECIFIED)
                  sb.append("UNSPECIFIED ");
              else if (mode == EXACTLY)
                  sb.append("EXACTLY ");
              else if (mode == AT_MOST)
                  sb.append("AT_MOST ");
              else
                  sb.append(mode).append(" ");
  
              sb.append(size);
              return sb.toString();
          }
      }
  
      private final class CheckForLongPress implements Runnable {
          private int mOriginalWindowAttachCount;
          private float mX;
          private float mY;
          private boolean mOriginalPressedState;
          /**
           * The classification of the long click being checked: one of the
           * StatsLog.TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__* constants.
           */
          private int mClassification;
  
          @Override
          public void run() {
              if ((mOriginalPressedState == isPressed()) && (mParent != null)
                      && mOriginalWindowAttachCount == mWindowAttachCount) {
                  recordGestureClassification(mClassification);
                  if (performLongClick(mX, mY)) {
                      mHasPerformedLongPress = true;
                  }
              }
          }
  
          public void setAnchor(float x, float y) {
              mX = x;
              mY = y;
          }
  
          public void rememberWindowAttachCount() {
              mOriginalWindowAttachCount = mWindowAttachCount;
          }
  
          public void rememberPressedState() {
              mOriginalPressedState = isPressed();
          }
  
          public void setClassification(int classification) {
              mClassification = classification;
          }
      }
  
      private final class CheckForTap implements Runnable {
          public float x;
          public float y;
  
          @Override
          public void run() {
              mPrivateFlags &= ~PFLAG_PREPRESSED;
              setPressed(true, x, y);
              final long delay =
                      ViewConfiguration.getLongPressTimeout() - ViewConfiguration.getTapTimeout();
              checkForLongClick(delay, x, y, TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__LONG_PRESS);
          }
      }
  
      private final class PerformClick implements Runnable {
          @Override
          public void run() {
              recordGestureClassification(TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__SINGLE_TAP);
              performClickInternal();
          }
      }
  
      /** Records a classification for the current event stream. */
      private void recordGestureClassification(int classification) {
          if (classification == TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__UNKNOWN_CLASSIFICATION) {
              return;
          }
          // To avoid negatively impacting View performance, the latency and displacement metrics
          // are omitted.
          StatsLog.write(StatsLog.TOUCH_GESTURE_CLASSIFIED, getClass().getName(), classification);
      }
  
      /**
       * This method returns a ViewPropertyAnimator object, which can be used to animate
       * specific properties on this View.
       *
       * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View.
       */
      public ViewPropertyAnimator animate() {
          if (mAnimator == null) {
              mAnimator = new ViewPropertyAnimator(this);
          }
          return mAnimator;
      }
  
      /**
       * Sets the name of the View to be used to identify Views in Transitions.
       * Names should be unique in the View hierarchy.
       *
       * @param transitionName The name of the View to uniquely identify it for Transitions.
       */
      public final void setTransitionName(String transitionName) {
          mTransitionName = transitionName;
      }
  
      /**
       * Returns the name of the View to be used to identify Views in Transitions.
       * Names should be unique in the View hierarchy.
       *
       * <p>This returns null if the View has not been given a name.</p>
       *
       * @return The name used of the View to be used to identify Views in Transitions or null
       * if no name has been given.
       */
      @ViewDebug.ExportedProperty
      @InspectableProperty
      public String getTransitionName() {
          return mTransitionName;
      }
  
      /**
       * @hide
       */
      public void requestKeyboardShortcuts(List<KeyboardShortcutGroup> data, int deviceId) {
          // Do nothing.
      }
  
      /**
       * Interface definition for a callback to be invoked when a hardware key event is
       * dispatched to this view. The callback will be invoked before the key event is
       * given to the view. This is only useful for hardware keyboards; a software input
       * method has no obligation to trigger this listener.
       */
      public interface OnKeyListener {
          /**
           * Called when a hardware key is dispatched to a view. This allows listeners to
           * get a chance to respond before the target view.
           * <p>Key presses in software keyboards will generally NOT trigger this method,
           * although some may elect to do so in some situations. Do not assume a
           * software input method has to be key-based; even if it is, it may use key presses
           * in a different way than you expect, so there is no way to reliably catch soft
           * input key presses.
           *
           * @param v The view the key has been dispatched to.
           * @param keyCode The code for the physical key that was pressed
           * @param event The KeyEvent object containing full information about
           *        the event.
           * @return True if the listener has consumed the event, false otherwise.
           */
          boolean onKey(View v, int keyCode, KeyEvent event);
      }
  
      /**
       * Interface definition for a callback to be invoked when a hardware key event hasn't
       * been handled by the view hierarchy.
       */
      public interface OnUnhandledKeyEventListener {
          /**
           * Called when a hardware key is dispatched to a view after being unhandled during normal
           * {@link KeyEvent} dispatch.
           *
           * @param v The view the key has been dispatched to.
           * @param event The KeyEvent object containing information about the event.
           * @return {@code true} if the listener has consumed the event, {@code false} otherwise.
           */
          boolean onUnhandledKeyEvent(View v, KeyEvent event);
      }
  
      /**
       * Interface definition for a callback to be invoked when a touch event is
       * dispatched to this view. The callback will be invoked before the touch
       * event is given to the view.
       */
      public interface OnTouchListener {
          /**
           * Called when a touch event is dispatched to a view. This allows listeners to
           * get a chance to respond before the target view.
           *
           * @param v The view the touch event has been dispatched to.
           * @param event The MotionEvent object containing full information about
           *        the event.
           * @return True if the listener has consumed the event, false otherwise.
           */
          boolean onTouch(View v, MotionEvent event);
      }
  
      /**
       * Interface definition for a callback to be invoked when a hover event is
       * dispatched to this view. The callback will be invoked before the hover
       * event is given to the view.
       */
      public interface OnHoverListener {
          /**
           * Called when a hover event is dispatched to a view. This allows listeners to
           * get a chance to respond before the target view.
           *
           * @param v The view the hover event has been dispatched to.
           * @param event The MotionEvent object containing full information about
           *        the event.
           * @return True if the listener has consumed the event, false otherwise.
           */
          boolean onHover(View v, MotionEvent event);
      }
  
      /**
       * Interface definition for a callback to be invoked when a generic motion event is
       * dispatched to this view. The callback will be invoked before the generic motion
       * event is given to the view.
       */
      public interface OnGenericMotionListener {
          /**
           * Called when a generic motion event is dispatched to a view. This allows listeners to
           * get a chance to respond before the target view.
           *
           * @param v The view the generic motion event has been dispatched to.
           * @param event The MotionEvent object containing full information about
           *        the event.
           * @return True if the listener has consumed the event, false otherwise.
           */
          boolean onGenericMotion(View v, MotionEvent event);
      }
  
      /**
       * Interface definition for a callback to be invoked when a view has been clicked and held.
       */
      public interface OnLongClickListener {
          /**
           * Called when a view has been clicked and held.
           *
           * @param v The view that was clicked and held.
           *
           * @return true if the callback consumed the long click, false otherwise.
           */
          boolean onLongClick(View v);
      }
  
      /**
       * Interface definition for a callback to be invoked when a drag is being dispatched
       * to this view.  The callback will be invoked before the hosting view's own
       * onDrag(event) method.  If the listener wants to fall back to the hosting view's
       * onDrag(event) behavior, it should return 'false' from this callback.
       *
       * <div class="special reference">
       * <h3>Developer Guides</h3>
       * <p>For a guide to implementing drag and drop features, read the
       * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p>
       * </div>
       */
      public interface OnDragListener {
          /**
           * Called when a drag event is dispatched to a view. This allows listeners
           * to get a chance to override base View behavior.
           *
           * @param v The View that received the drag event.
           * @param event The {@link android.view.DragEvent} object for the drag event.
           * @return {@code true} if the drag event was handled successfully, or {@code false}
           * if the drag event was not handled. Note that {@code false} will trigger the View
           * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler.
           */
          boolean onDrag(View v, DragEvent event);
      }
  
      /**
       * Interface definition for a callback to be invoked when the focus state of
       * a view changed.
       */
      public interface OnFocusChangeListener {
          /**
           * Called when the focus state of a view has changed.
           *
           * @param v The view whose state has changed.
           * @param hasFocus The new focus state of v.
           */
          void onFocusChange(View v, boolean hasFocus);
      }
  
      /**
       * Interface definition for a callback to be invoked when a view is clicked.
       */
      public interface OnClickListener {
          /**
           * Called when a view has been clicked.
           *
           * @param v The view that was clicked.
           */
          void onClick(View v);
      }
  
      /**
       * Interface definition for a callback to be invoked when a view is context clicked.
       */
      public interface OnContextClickListener {
          /**
           * Called when a view is context clicked.
           *
           * @param v The view that has been context clicked.
           * @return true if the callback consumed the context click, false otherwise.
           */
          boolean onContextClick(View v);
      }
  
      /**
       * Interface definition for a callback to be invoked when the context menu
       * for this view is being built.
       */
      public interface OnCreateContextMenuListener {
          /**
           * Called when the context menu for this view is being built. It is not
           * safe to hold onto the menu after this method returns.
           *
           * @param menu The context menu that is being built
           * @param v The view for which the context menu is being built
           * @param menuInfo Extra information about the item for which the
           *            context menu should be shown. This information will vary
           *            depending on the class of v.
           */
          void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo);
      }
  
      /**
       * Interface definition for a callback to be invoked when the status bar changes
       * visibility.  This reports <strong>global</strong> changes to the system UI
       * state, not what the application is requesting.
       *
       * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener)
       */
      public interface OnSystemUiVisibilityChangeListener {
          /**
           * Called when the status bar changes visibility because of a call to
           * {@link View#setSystemUiVisibility(int)}.
           *
           * @param visibility  Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE},
           * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}.
           * This tells you the <strong>global</strong> state of these UI visibility
           * flags, not what your app is currently applying.
           */
          public void onSystemUiVisibilityChange(int visibility);
      }
  
      /**
       * Interface definition for a callback to be invoked when this view is attached
       * or detached from its window.
       */
      public interface OnAttachStateChangeListener {
          /**
           * Called when the view is attached to a window.
           * @param v The view that was attached
           */
          public void onViewAttachedToWindow(View v);
          /**
           * Called when the view is detached from a window.
           * @param v The view that was detached
           */
          public void onViewDetachedFromWindow(View v);
      }
  
      /**
       * Listener for applying window insets on a view in a custom way.
       *
       * <p>Apps may choose to implement this interface if they want to apply custom policy
       * to the way that window insets are treated for a view. If an OnApplyWindowInsetsListener
       * is set, its
       * {@link OnApplyWindowInsetsListener#onApplyWindowInsets(View, WindowInsets) onApplyWindowInsets}
       * method will be called instead of the View's own
       * {@link #onApplyWindowInsets(WindowInsets) onApplyWindowInsets} method. The listener
       * may optionally call the parameter View's <code>onApplyWindowInsets</code> method to apply
       * the View's normal behavior as part of its own.</p>
       */
      public interface OnApplyWindowInsetsListener {
          /**
           * When {@link View#setOnApplyWindowInsetsListener(View.OnApplyWindowInsetsListener) set}
           * on a View, this listener method will be called instead of the view's own
           * {@link View#onApplyWindowInsets(WindowInsets) onApplyWindowInsets} method.
           *
           * @param v The view applying window insets
           * @param insets The insets to apply
           * @return The insets supplied, minus any insets that were consumed
           */
          public WindowInsets onApplyWindowInsets(View v, WindowInsets insets);
      }
  
      private final class UnsetPressedState implements Runnable {
          @Override
          public void run() {
              setPressed(false);
          }
      }
  
      /**
       * When a view becomes invisible checks if autofill considers the view invisible too. This
       * happens after the regular removal operation to make sure the operation is finished by the
       * time this is called.
       */
      private static class VisibilityChangeForAutofillHandler extends Handler {
          private final AutofillManager mAfm;
          private final View mView;
  
          private VisibilityChangeForAutofillHandler(@NonNull AutofillManager afm,
                  @NonNull View view) {
              mAfm = afm;
              mView = view;
          }
  
          @Override
          public void handleMessage(Message msg) {
              mAfm.notifyViewVisibilityChanged(mView, mView.isShown());
          }
      }
  
      /**
       * Base class for derived classes that want to save and restore their own
       * state in {@link android.view.View#onSaveInstanceState()}.
       */
      public static class BaseSavedState extends AbsSavedState {
          static final int START_ACTIVITY_REQUESTED_WHO_SAVED = 0b1;
          static final int IS_AUTOFILLED = 0b10;
          static final int AUTOFILL_ID = 0b100;
  
          // Flags that describe what data in this state is valid
          int mSavedData;
          String mStartActivityRequestWhoSaved;
          boolean mIsAutofilled;
          int mAutofillViewId;
  
          /**
           * Constructor used when reading from a parcel. Reads the state of the superclass.
           *
           * @param source parcel to read from
           */
          public BaseSavedState(Parcel source) {
              this(source, null);
          }
  
          /**
           * Constructor used when reading from a parcel using a given class loader.
           * Reads the state of the superclass.
           *
           * @param source parcel to read from
           * @param loader ClassLoader to use for reading
           */
          public BaseSavedState(Parcel source, ClassLoader loader) {
              super(source, loader);
              mSavedData = source.readInt();
              mStartActivityRequestWhoSaved = source.readString();
              mIsAutofilled = source.readBoolean();
              mAutofillViewId = source.readInt();
          }
  
          /**
           * Constructor called by derived classes when creating their SavedState objects
           *
           * @param superState The state of the superclass of this view
           */
          public BaseSavedState(Parcelable superState) {
              super(superState);
          }
  
          @Override
          public void writeToParcel(Parcel out, int flags) {
              super.writeToParcel(out, flags);
  
              out.writeInt(mSavedData);
              out.writeString(mStartActivityRequestWhoSaved);
              out.writeBoolean(mIsAutofilled);
              out.writeInt(mAutofillViewId);
          }
  
          public static final @android.annotation.NonNull Parcelable.Creator<BaseSavedState> CREATOR
                  = new Parcelable.ClassLoaderCreator<BaseSavedState>() {
              @Override
              public BaseSavedState createFromParcel(Parcel in) {
                  return new BaseSavedState(in);
              }
  
              @Override
              public BaseSavedState createFromParcel(Parcel in, ClassLoader loader) {
                  return new BaseSavedState(in, loader);
              }
  
              @Override
              public BaseSavedState[] newArray(int size) {
                  return new BaseSavedState[size];
              }
          };
      }
  
      /**
       * A set of information given to a view when it is attached to its parent
       * window.
       */
      final static class AttachInfo {
          interface Callbacks {
              void playSoundEffect(int effectId);
              boolean performHapticFeedback(int effectId, boolean always);
          }
  
          /**
           * InvalidateInfo is used to post invalidate(int, int, int, int) messages
           * to a Handler. This class contains the target (View) to invalidate and
           * the coordinates of the dirty rectangle.
           *
           * For performance purposes, this class also implements a pool of up to
           * POOL_LIMIT objects that get reused. This reduces memory allocations
           * whenever possible.
           */
          static class InvalidateInfo {
              private static final int POOL_LIMIT = 10;
  
              private static final SynchronizedPool<InvalidateInfo> sPool =
                      new SynchronizedPool<InvalidateInfo>(POOL_LIMIT);
  
              @UnsupportedAppUsage
              View target;
  
              @UnsupportedAppUsage
              int left;
              @UnsupportedAppUsage
              int top;
              @UnsupportedAppUsage
              int right;
              @UnsupportedAppUsage
              int bottom;
  
              public static InvalidateInfo obtain() {
                  InvalidateInfo instance = sPool.acquire();
                  return (instance != null) ? instance : new InvalidateInfo();
              }
  
              public void recycle() {
                  target = null;
                  sPool.release(this);
              }
          }
  
          @UnsupportedAppUsage
          final IWindowSession mSession;
  
          @UnsupportedAppUsage
          final IWindow mWindow;
  
          final IBinder mWindowToken;
  
          Display mDisplay;
  
          final Callbacks mRootCallbacks;
  
          IWindowId mIWindowId;
          WindowId mWindowId;
  
          /**
           * The top view of the hierarchy.
           */
          View mRootView;
  
          IBinder mPanelParentWindowToken;
  
          boolean mHardwareAccelerated;
          boolean mHardwareAccelerationRequested;
          ThreadedRenderer mThreadedRenderer;
          List<RenderNode> mPendingAnimatingRenderNodes;
  
          /**
           * The state of the display to which the window is attached, as reported
           * by {@link Display#getState()}.  Note that the display state constants
           * declared by {@link Display} do not exactly line up with the screen state
           * constants declared by {@link View} (there are more display states than
           * screen states).
           */
          @UnsupportedAppUsage
          int mDisplayState = Display.STATE_UNKNOWN;
  
          /**
           * Scale factor used by the compatibility mode
           */
          @UnsupportedAppUsage
          float mApplicationScale;
  
          /**
           * Indicates whether the application is in compatibility mode
           */
          @UnsupportedAppUsage
          boolean mScalingRequired;
  
          /**
           * Left position of this view's window
           */
          int mWindowLeft;
  
          /**
           * Top position of this view's window
           */
          int mWindowTop;
  
          /**
           * Indicates whether views need to use 32-bit drawing caches
           */
          boolean mUse32BitDrawingCache;
  
          /**
           * For windows that are full-screen but using insets to layout inside
           * of the screen areas, these are the current insets to appear inside
           * the overscan area of the display.
           */
          final Rect mOverscanInsets = new Rect();
  
          /**
           * For windows that are full-screen but using insets to layout inside
           * of the screen decorations, these are the current insets for the
           * content of the window.
           */
          @UnsupportedAppUsage
          final Rect mContentInsets = new Rect();
  
          /**
           * For windows that are full-screen but using insets to layout inside
           * of the screen decorations, these are the current insets for the
           * actual visible parts of the window.
           */
          @UnsupportedAppUsage
          final Rect mVisibleInsets = new Rect();
  
          /**
           * For windows that are full-screen but using insets to layout inside
           * of the screen decorations, these are the current insets for the
           * stable system windows.
           */
          @UnsupportedAppUsage
          final Rect mStableInsets = new Rect();
  
          final DisplayCutout.ParcelableWrapper mDisplayCutout =
                  new DisplayCutout.ParcelableWrapper(DisplayCutout.NO_CUTOUT);
  
          /**
           * For windows that include areas that are not covered by real surface these are the outsets
           * for real surface.
           */
          final Rect mOutsets = new Rect();
  
          /**
           * In multi-window we force show the system bars. Because we don't want that the surface
           * size changes in this mode, we instead have a flag whether the system bars sizes should
           * always be consumed, so the app is treated like there are no virtual system bars at all.
           */
          boolean mAlwaysConsumeSystemBars;
  
          /**
           * The internal insets given by this window.  This value is
           * supplied by the client (through
           * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will
           * be given to the window manager when changed to be used in laying
           * out windows behind it.
           */
          @UnsupportedAppUsage
          final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets
                  = new ViewTreeObserver.InternalInsetsInfo();
  
          /**
           * Set to true when mGivenInternalInsets is non-empty.
           */
          boolean mHasNonEmptyGivenInternalInsets;
  
          /**
           * All views in the window's hierarchy that serve as scroll containers,
           * used to determine if the window can be resized or must be panned
           * to adjust for a soft input area.
           */
          @UnsupportedAppUsage
          final ArrayList<View> mScrollContainers = new ArrayList<View>();
  
          @UnsupportedAppUsage
          final KeyEvent.DispatcherState mKeyDispatchState
                  = new KeyEvent.DispatcherState();
  
          /**
           * Indicates whether the view's window currently has the focus.
           */
          @UnsupportedAppUsage
          boolean mHasWindowFocus;
  
          /**
           * The current visibility of the window.
           */
          int mWindowVisibility;
  
          /**
           * Indicates the time at which drawing started to occur.
           */
          @UnsupportedAppUsage
          long mDrawingTime;
  
          /**
           * Indicates whether the view's window is currently in touch mode.
           */
          @UnsupportedAppUsage
          boolean mInTouchMode;
  
          /**
           * Indicates whether the view has requested unbuffered input dispatching for the current
           * event stream.
           */
          boolean mUnbufferedDispatchRequested;
  
          /**
           * Indicates that ViewAncestor should trigger a global layout change
           * the next time it performs a traversal
           */
          @UnsupportedAppUsage
          boolean mRecomputeGlobalAttributes;
  
          /**
           * Always report new attributes at next traversal.
           */
          boolean mForceReportNewAttributes;
  
          /**
           * Set during a traveral if any views want to keep the screen on.
           */
          @UnsupportedAppUsage
          boolean mKeepScreenOn;
  
          /**
           * Set during a traveral if the light center needs to be updated.
           */
          boolean mNeedsUpdateLightCenter;
  
          /**
           * Bitwise-or of all of the values that views have passed to setSystemUiVisibility().
           */
          int mSystemUiVisibility;
  
          /**
           * Hack to force certain system UI visibility flags to be cleared.
           */
          int mDisabledSystemUiVisibility;
  
          /**
           * Last global system UI visibility reported by the window manager.
           */
          int mGlobalSystemUiVisibility = -1;
  
          /**
           * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener
           * attached.
           */
          boolean mHasSystemUiListeners;
  
          /**
           * Set if the window has requested to extend into the overscan region
           * via WindowManager.LayoutParams.FLAG_LAYOUT_IN_OVERSCAN.
           */
          boolean mOverscanRequested;
  
          /**
           * Set if the visibility of any views has changed.
           */
          @UnsupportedAppUsage
          boolean mViewVisibilityChanged;
  
          /**
           * Set to true if a view has been scrolled.
           */
          @UnsupportedAppUsage
          boolean mViewScrollChanged;
  
          /**
           * Set to true if a pointer event is currently being handled.
           */
          boolean mHandlingPointerEvent;
  
          /**
           * The offset of this view's window when it's on an embedded display that is re-parented
           * to another window.
           */
          final Point mLocationInParentDisplay = new Point();
  
          /**
           * Global to the view hierarchy used as a temporary for dealing with
           * x/y points in the transparent region computations.
           */
          final int[] mTransparentLocation = new int[2];
  
          /**
           * Global to the view hierarchy used as a temporary for dealing with
           * x/y points in the ViewGroup.invalidateChild implementation.
           */
          final int[] mInvalidateChildLocation = new int[2];
  
          /**
           * Global to the view hierarchy used as a temporary for dealing with
           * computing absolute on-screen location.
           */
          final int[] mTmpLocation = new int[2];
  
          /**
           * Global to the view hierarchy used as a temporary for dealing with
           * x/y location when view is transformed.
           */
          final float[] mTmpTransformLocation = new float[2];
  
          /**
           * The view tree observer used to dispatch global events like
           * layout, pre-draw, touch mode change, etc.
           */
          @UnsupportedAppUsage
          final ViewTreeObserver mTreeObserver;
  
          /**
           * A Canvas used by the view hierarchy to perform bitmap caching.
           */
          Canvas mCanvas;
  
          /**
           * The view root impl.
           */
          final ViewRootImpl mViewRootImpl;
  
          /**
           * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This
           * handler can be used to pump events in the UI events queue.
           */
          @UnsupportedAppUsage
          final Handler mHandler;
  
          /**
           * Temporary for use in computing invalidate rectangles while
           * calling up the hierarchy.
           */
          final Rect mTmpInvalRect = new Rect();
  
          /**
           * Temporary for use in computing hit areas with transformed views
           */
          final RectF mTmpTransformRect = new RectF();
  
          /**
           * Temporary for use in computing hit areas with transformed views
           */
          final RectF mTmpTransformRect1 = new RectF();
  
          /**
           * Temporary list of rectanges.
           */
          final List<RectF> mTmpRectList = new ArrayList<>();
  
          /**
           * Temporary for use in transforming invalidation rect
           */
          final Matrix mTmpMatrix = new Matrix();
  
          /**
           * Temporary for use in transforming invalidation rect
           */
          final Transformation mTmpTransformation = new Transformation();
  
          /**
           * Temporary for use in querying outlines from OutlineProviders
           */
          final Outline mTmpOutline = new Outline();
  
          /**
           * Temporary list for use in collecting focusable descendents of a view.
           */
          final ArrayList<View> mTempArrayList = new ArrayList<View>(24);
  
          /**
           * The id of the window for accessibility purposes.
           */
          int mAccessibilityWindowId = AccessibilityWindowInfo.UNDEFINED_WINDOW_ID;
  
          /**
           * Flags related to accessibility processing.
           *
           * @see AccessibilityNodeInfo#FLAG_INCLUDE_NOT_IMPORTANT_VIEWS
           * @see AccessibilityNodeInfo#FLAG_REPORT_VIEW_IDS
           */
          int mAccessibilityFetchFlags;
  
          /**
           * The drawable for highlighting accessibility focus.
           */
          Drawable mAccessibilityFocusDrawable;
  
          /**
           * The drawable for highlighting autofilled views.
           *
           * @see #isAutofilled()
           */
          Drawable mAutofilledDrawable;
  
          /**
           * Show where the margins, bounds and layout bounds are for each view.
           */
          boolean mDebugLayout = DisplayProperties.debug_layout().orElse(false);
  
          /**
           * Point used to compute visible regions.
           */
          final Point mPoint = new Point();
  
          /**
           * Used to track which View originated a requestLayout() call, used when
           * requestLayout() is called during layout.
           */
          View mViewRequestingLayout;
  
          /**
           * Used to track the identity of the current drag operation.
           */
          IBinder mDragToken;
  
          /**
           * The drag shadow surface for the current drag operation.
           */
          public Surface mDragSurface;
  
  
          /**
           * The view that currently has a tooltip displayed.
           */
          View mTooltipHost;
  
          /**
           * The initial structure has been reported so the view is ready to report updates.
           */
          boolean mReadyForContentCaptureUpdates;
  
          /**
           * Map(keyed by session) of content capture events that need to be notified after the view
           * hierarchy is traversed: value is either the view itself for appearead events, or its
           * autofill id for disappeared.
           */
          SparseArray<ArrayList<Object>> mContentCaptureEvents;
  
          /**
           * Cached reference to the {@link ContentCaptureManager}.
           */
          ContentCaptureManager mContentCaptureManager;
  
          /**
           * Creates a new set of attachment information with the specified
           * events handler and thread.
           *
           * @param handler the events handler the view must use
           */
          AttachInfo(IWindowSession session, IWindow window, Display display,
                  ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer,
                  Context context) {
              mSession = session;
              mWindow = window;
              mWindowToken = window.asBinder();
              mDisplay = display;
              mViewRootImpl = viewRootImpl;
              mHandler = handler;
              mRootCallbacks = effectPlayer;
              mTreeObserver = new ViewTreeObserver(context);
          }
  
          private void delayNotifyContentCaptureEvent(@NonNull ContentCaptureSession session,
                  @NonNull View view, boolean appeared) {
              if (mContentCaptureEvents == null) {
                  // Most of the time there will be just one session, so intial capacity is 1
                  mContentCaptureEvents = new SparseArray<>(1);
              }
              int sessionId = session.getId();
              // TODO: life would be much easier if we provided a MultiMap implementation somwhere...
              ArrayList<Object> events = mContentCaptureEvents.get(sessionId);
              if (events == null) {
                  events = new ArrayList<>();
                  mContentCaptureEvents.put(sessionId, events);
              }
              events.add(appeared ? view : view.getAutofillId());
          }
  
          @Nullable
          ContentCaptureManager getContentCaptureManager(@NonNull Context context) {
              if (mContentCaptureManager != null) {
                  return mContentCaptureManager;
              }
              mContentCaptureManager = context.getSystemService(ContentCaptureManager.class);
              return mContentCaptureManager;
          }
      }
  
      /**
       * <p>ScrollabilityCache holds various fields used by a View when scrolling
       * is supported. This avoids keeping too many unused fields in most
       * instances of View.</p>
       */
      private static class ScrollabilityCache implements Runnable {
  
          /**
           * Scrollbars are not visible
           */
          public static final int OFF = 0;
  
          /**
           * Scrollbars are visible
           */
          public static final int ON = 1;
  
          /**
           * Scrollbars are fading away
           */
          public static final int FADING = 2;
  
          public boolean fadeScrollBars;
  
          public int fadingEdgeLength;
          public int scrollBarDefaultDelayBeforeFade;
          public int scrollBarFadeDuration;
  
          public int scrollBarSize;
          public int scrollBarMinTouchTarget;
          @UnsupportedAppUsage
          public ScrollBarDrawable scrollBar;
          public float[] interpolatorValues;
          @UnsupportedAppUsage
          public View host;
  
          public final Paint paint;
          public final Matrix matrix;
          public Shader shader;
  
          public final Interpolator scrollBarInterpolator = new Interpolator(1, 2);
  
          private static final float[] OPAQUE = { 255 };
          private static final float[] TRANSPARENT = { 0.0f };
  
          /**
           * When fading should start. This time moves into the future every time
           * a new scroll happens. Measured based on SystemClock.uptimeMillis()
           */
          public long fadeStartTime;
  
  
          /**
           * The current state of the scrollbars: ON, OFF, or FADING
           */
          @UnsupportedAppUsage
          public int state = OFF;
  
          private int mLastColor;
  
          public final Rect mScrollBarBounds = new Rect();
          public final Rect mScrollBarTouchBounds = new Rect();
  
          public static final int NOT_DRAGGING = 0;
          public static final int DRAGGING_VERTICAL_SCROLL_BAR = 1;
          public static final int DRAGGING_HORIZONTAL_SCROLL_BAR = 2;
          public int mScrollBarDraggingState = NOT_DRAGGING;
  
          public float mScrollBarDraggingPos = 0;
  
          public ScrollabilityCache(ViewConfiguration configuration, View host) {
              fadingEdgeLength = configuration.getScaledFadingEdgeLength();
              scrollBarSize = configuration.getScaledScrollBarSize();
              scrollBarMinTouchTarget = configuration.getScaledMinScrollbarTouchTarget();
              scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay();
              scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration();
  
              paint = new Paint();
              matrix = new Matrix();
              // use use a height of 1, and then wack the matrix each time we
              // actually use it.
              shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP);
              paint.setShader(shader);
              paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
  
              this.host = host;
          }
  
          public void setFadeColor(int color) {
              if (color != mLastColor) {
                  mLastColor = color;
  
                  if (color != 0) {
                      shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000,
                              color & 0x00FFFFFF, Shader.TileMode.CLAMP);
                      paint.setShader(shader);
                      // Restore the default transfer mode (src_over)
                      paint.setXfermode(null);
                  } else {
                      shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP);
                      paint.setShader(shader);
                      paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
                  }
              }
          }
  
          public void run() {
              long now = AnimationUtils.currentAnimationTimeMillis();
              if (now >= fadeStartTime) {
  
                  // the animation fades the scrollbars out by changing
                  // the opacity (alpha) from fully opaque to fully
                  // transparent
                  int nextFrame = (int) now;
                  int framesCount = 0;
  
                  Interpolator interpolator = scrollBarInterpolator;
  
                  // Start opaque
                  interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE);
  
                  // End transparent
                  nextFrame += scrollBarFadeDuration;
                  interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT);
  
                  state = FADING;
  
                  // Kick off the fade animation
                  host.invalidate(true);
              }
          }
      }
  
      /**
       * Resuable callback for sending
       * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event.
       */
      private class SendViewScrolledAccessibilityEvent implements Runnable {
          public volatile boolean mIsPending;
          public int mDeltaX;
          public int mDeltaY;
  
          public void post(int dx, int dy) {
              mDeltaX += dx;
              mDeltaY += dy;
              if (!mIsPending) {
                  mIsPending = true;
                  postDelayed(this, ViewConfiguration.getSendRecurringAccessibilityEventsInterval());
              }
          }
  
          @Override
          public void run() {
              if (AccessibilityManager.getInstance(mContext).isEnabled()) {
                  AccessibilityEvent event = AccessibilityEvent.obtain(
                          AccessibilityEvent.TYPE_VIEW_SCROLLED);
                  event.setScrollDeltaX(mDeltaX);
                  event.setScrollDeltaY(mDeltaY);
                  sendAccessibilityEventUnchecked(event);
              }
              reset();
          }
  
          private void reset() {
              mIsPending = false;
              mDeltaX = 0;
              mDeltaY = 0;
          }
      }
  
      /**
       * Remove the pending callback for sending a
       * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event.
       */
      @UnsupportedAppUsage
      private void cancel(@Nullable SendViewScrolledAccessibilityEvent callback) {
          if (callback == null || !callback.mIsPending) return;
          removeCallbacks(callback);
          callback.reset();
      }
  
      /**
       * <p>
       * This class represents a delegate that can be registered in a {@link View}
       * to enhance accessibility support via composition rather via inheritance.
       * It is specifically targeted to widget developers that extend basic View
       * classes i.e. classes in package android.view, that would like their
       * applications to be backwards compatible.
       * </p>
       * <div class="special reference">
       * <h3>Developer Guides</h3>
       * <p>For more information about making applications accessible, read the
       * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a>
       * developer guide.</p>
       * </div>
       * <p>
       * A scenario in which a developer would like to use an accessibility delegate
       * is overriding a method introduced in a later API version than the minimal API
       * version supported by the application. For example, the method
       * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available
       * in API version 4 when the accessibility APIs were first introduced. If a
       * developer would like their application to run on API version 4 devices (assuming
       * all other APIs used by the application are version 4 or lower) and take advantage
       * of this method, instead of overriding the method which would break the application's
       * backwards compatibility, they can override the corresponding method in this
       * delegate and register the delegate in the target View if the API version of
       * the system is high enough, i.e. the API version is the same as or higher than the API
       * version that introduced
       * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}.
       * </p>
       * <p>
       * Here is an example implementation:
       * </p>
       * <code><pre><p>
       * if (Build.VERSION.SDK_INT >= 14) {
       *     // If the API version is equal of higher than the version in
       *     // which onInitializeAccessibilityNodeInfo was introduced we
       *     // register a delegate with a customized implementation.
       *     View view = findViewById(R.id.view_id);
       *     view.setAccessibilityDelegate(new AccessibilityDelegate() {
       *         public void onInitializeAccessibilityNodeInfo(View host,
       *                 AccessibilityNodeInfo info) {
       *             // Let the default implementation populate the info.
       *             super.onInitializeAccessibilityNodeInfo(host, info);
       *             // Set some other information.
       *             info.setEnabled(host.isEnabled());
       *         }
       *     });
       * }
       * </code></pre></p>
       * <p>
       * This delegate contains methods that correspond to the accessibility methods
       * in View. If a delegate has been specified the implementation in View hands
       * off handling to the corresponding method in this delegate. The default
       * implementation the delegate methods behaves exactly as the corresponding
       * method in View for the case of no accessibility delegate been set. Hence,
       * to customize the behavior of a View method, clients can override only the
       * corresponding delegate method without altering the behavior of the rest
       * accessibility related methods of the host view.
       * </p>
       * <p>
       * <strong>Note:</strong> On platform versions prior to
       * {@link android.os.Build.VERSION_CODES#M API 23}, delegate methods on
       * views in the {@code android.widget.*} package are called <i>before</i>
       * host methods. This prevents certain properties such as class name from
       * being modified by overriding
       * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)},
       * as any changes will be overwritten by the host class.
       * <p>
       * Starting in {@link android.os.Build.VERSION_CODES#M API 23}, delegate
       * methods are called <i>after</i> host methods, which all properties to be
       * modified without being overwritten by the host class.
       */
      public static class AccessibilityDelegate {
  
          /**
           * Sends an accessibility event of the given type. If accessibility is not
           * enabled this method has no effect.
           * <p>
           * The default implementation behaves as {@link View#sendAccessibilityEvent(int)
           *  View#sendAccessibilityEvent(int)} for the case of no accessibility delegate
           * been set.
           * </p>
           *
           * @param host The View hosting the delegate.
           * @param eventType The type of the event to send.
           *
           * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int)
           */
          public void sendAccessibilityEvent(View host, int eventType) {
              host.sendAccessibilityEventInternal(eventType);
          }
  
          /**
           * Performs the specified accessibility action on the view. For
           * possible accessibility actions look at {@link AccessibilityNodeInfo}.
           * <p>
           * The default implementation behaves as
           * {@link View#performAccessibilityAction(int, Bundle)
           *  View#performAccessibilityAction(int, Bundle)} for the case of
           *  no accessibility delegate been set.
           * </p>
           *
           * @param action The action to perform.
           * @return Whether the action was performed.
           *
           * @see View#performAccessibilityAction(int, Bundle)
           *      View#performAccessibilityAction(int, Bundle)
           */
          public boolean performAccessibilityAction(View host, int action, Bundle args) {
              return host.performAccessibilityActionInternal(action, args);
          }
  
          /**
           * Sends an accessibility event. This method behaves exactly as
           * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an
           * empty {@link AccessibilityEvent} and does not perform a check whether
           * accessibility is enabled.
           * <p>
           * The default implementation behaves as
           * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent)
           *  View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for
           * the case of no accessibility delegate been set.
           * </p>
           *
           * @param host The View hosting the delegate.
           * @param event The event to send.
           *
           * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent)
           *      View#sendAccessibilityEventUnchecked(AccessibilityEvent)
           */
          public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) {
              host.sendAccessibilityEventUncheckedInternal(event);
          }
  
          /**
           * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then
           * to its children for adding their text content to the event.
           * <p>
           * The default implementation behaves as
           * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)
           *  View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for
           * the case of no accessibility delegate been set.
           * </p>
           *
           * @param host The View hosting the delegate.
           * @param event The event.
           * @return True if the event population was completed.
           *
           * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)
           *      View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)
           */
          public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
              return host.dispatchPopulateAccessibilityEventInternal(event);
          }
  
          /**
           * Gives a chance to the host View to populate the accessibility event with its
           * text content.
           * <p>
           * The default implementation behaves as
           * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent)
           *  View#onPopulateAccessibilityEvent(AccessibilityEvent)} for
           * the case of no accessibility delegate been set.
           * </p>
           *
           * @param host The View hosting the delegate.
           * @param event The accessibility event which to populate.
           *
           * @see View#onPopulateAccessibilityEvent(AccessibilityEvent)
           *      View#onPopulateAccessibilityEvent(AccessibilityEvent)
           */
          public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
              host.onPopulateAccessibilityEventInternal(event);
          }
  
          /**
           * Initializes an {@link AccessibilityEvent} with information about the
           * the host View which is the event source.
           * <p>
           * The default implementation behaves as
           * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent)
           *  View#onInitializeAccessibilityEvent(AccessibilityEvent)} for
           * the case of no accessibility delegate been set.
           * </p>
           *
           * @param host The View hosting the delegate.
           * @param event The event to initialize.
           *
           * @see View#onInitializeAccessibilityEvent(AccessibilityEvent)
           *      View#onInitializeAccessibilityEvent(AccessibilityEvent)
           */
          public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
              host.onInitializeAccessibilityEventInternal(event);
          }
  
          /**
           * Initializes an {@link AccessibilityNodeInfo} with information about the host view.
           * <p>
           * The default implementation behaves as
           * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
           *  View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for
           * the case of no accessibility delegate been set.
           * </p>
           *
           * @param host The View hosting the delegate.
           * @param info The instance to initialize.
           *
           * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
           *      View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
           */
          public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {
              host.onInitializeAccessibilityNodeInfoInternal(info);
          }
  
          /**
           * Adds extra data to an {@link AccessibilityNodeInfo} based on an explicit request for the
           * additional data.
           * <p>
           * This method only needs to be implemented if the View offers to provide additional data.
           * </p>
           * <p>
           * The default implementation behaves as
           * {@link View#addExtraDataToAccessibilityNodeInfo(AccessibilityNodeInfo, String, Bundle)
           * for the case where no accessibility delegate is set.
           * </p>
           *
           * @param host The View hosting the delegate. Never {@code null}.
           * @param info The info to which to add the extra data. Never {@code null}.
           * @param extraDataKey A key specifying the type of extra data to add to the info. The
           *                     extra data should be added to the {@link Bundle} returned by
           *                     the info's {@link AccessibilityNodeInfo#getExtras} method.  Never
           *                     {@code null}.
           * @param arguments A {@link Bundle} holding any arguments relevant for this request.
           *                  May be {@code null} if the if the service provided no arguments.
           *
           * @see AccessibilityNodeInfo#setAvailableExtraData(List)
           */
          public void addExtraDataToAccessibilityNodeInfo(@NonNull View host,
                  @NonNull AccessibilityNodeInfo info, @NonNull String extraDataKey,
                  @Nullable Bundle arguments) {
              host.addExtraDataToAccessibilityNodeInfo(info, extraDataKey, arguments);
          }
  
          /**
           * Called when a child of the host View has requested sending an
           * {@link AccessibilityEvent} and gives an opportunity to the parent (the host)
           * to augment the event.
           * <p>
           * The default implementation behaves as
           * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)
           *  ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for
           * the case of no accessibility delegate been set.
           * </p>
           *
           * @param host The View hosting the delegate.
           * @param child The child which requests sending the event.
           * @param event The event to be sent.
           * @return True if the event should be sent
           *
           * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)
           *      ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)
           */
          public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child,
                  AccessibilityEvent event) {
              return host.onRequestSendAccessibilityEventInternal(child, event);
          }
  
          /**
           * Gets the provider for managing a virtual view hierarchy rooted at this View
           * and reported to {@link android.accessibilityservice.AccessibilityService}s
           * that explore the window content.
           * <p>
           * The default implementation behaves as
           * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for
           * the case of no accessibility delegate been set.
           * </p>
           *
           * @return The provider.
           *
           * @see AccessibilityNodeProvider
           */
          public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) {
              return null;
          }
  
          /**
           * Returns an {@link AccessibilityNodeInfo} representing the host view from the
           * point of view of an {@link android.accessibilityservice.AccessibilityService}.
           * This method is responsible for obtaining an accessibility node info from a
           * pool of reusable instances and calling
           * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on the host
           * view to initialize the former.
           * <p>
           * <strong>Note:</strong> The client is responsible for recycling the obtained
           * instance by calling {@link AccessibilityNodeInfo#recycle()} to minimize object
           * creation.
           * </p>
           * <p>
           * The default implementation behaves as
           * {@link View#createAccessibilityNodeInfo() View#createAccessibilityNodeInfo()} for
           * the case of no accessibility delegate been set.
           * </p>
           * @return A populated {@link AccessibilityNodeInfo}.
           *
           * @see AccessibilityNodeInfo
           *
           * @hide
           */
          @UnsupportedAppUsage
          public AccessibilityNodeInfo createAccessibilityNodeInfo(View host) {
              return host.createAccessibilityNodeInfoInternal();
          }
      }
  
      private static class MatchIdPredicate implements Predicate<View> {
          public int mId;
  
          @Override
          public boolean test(View view) {
              return (view.mID == mId);
          }
      }
  
      private static class MatchLabelForPredicate implements Predicate<View> {
          private int mLabeledId;
  
          @Override
          public boolean test(View view) {
              return (view.mLabelForId == mLabeledId);
          }
      }
  
      /**
       * Dump all private flags in readable format, useful for documentation and
       * sanity checking.
       */
      private static void dumpFlags() {
          final HashMap<String, String> found = Maps.newHashMap();
          try {
              for (Field field : View.class.getDeclaredFields()) {
                  final int modifiers = field.getModifiers();
                  if (Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers)) {
                      if (field.getType().equals(int.class)) {
                          final int value = field.getInt(null);
                          dumpFlag(found, field.getName(), value);
                      } else if (field.getType().equals(int[].class)) {
                          final int[] values = (int[]) field.get(null);
                          for (int i = 0; i < values.length; i++) {
                              dumpFlag(found, field.getName() + "[" + i + "]", values[i]);
                          }
                      }
                  }
              }
          } catch (IllegalAccessException e) {
              throw new RuntimeException(e);
          }
  
          final ArrayList<String> keys = Lists.newArrayList();
          keys.addAll(found.keySet());
          Collections.sort(keys);
          for (String key : keys) {
              Log.d(VIEW_LOG_TAG, found.get(key));
          }
      }
  
      private static void dumpFlag(HashMap<String, String> found, String name, int value) {
          // Sort flags by prefix, then by bits, always keeping unique keys
          final String bits = String.format("%32s", Integer.toBinaryString(value)).replace('0', ' ');
          final int prefix = name.indexOf('_');
          final String key = (prefix > 0 ? name.substring(0, prefix) : name) + bits + name;
          final String output = bits + " " + name;
          found.put(key, output);
      }
  
      /** {@hide} */
      public void encode(@NonNull ViewHierarchyEncoder stream) {
          stream.beginObject(this);
          encodeProperties(stream);
          stream.endObject();
      }
  
      /** {@hide} */
      @CallSuper
      protected void encodeProperties(@NonNull ViewHierarchyEncoder stream) {
          Object resolveId = ViewDebug.resolveId(getContext(), mID);
          if (resolveId instanceof String) {
              stream.addProperty("id", (String) resolveId);
          } else {
              stream.addProperty("id", mID);
          }
  
          stream.addProperty("misc:transformation.alpha",
                  mTransformationInfo != null ? mTransformationInfo.mAlpha : 0);
          stream.addProperty("misc:transitionName", getTransitionName());
  
          // layout
          stream.addProperty("layout:left", mLeft);
          stream.addProperty("layout:right", mRight);
          stream.addProperty("layout:top", mTop);
          stream.addProperty("layout:bottom", mBottom);
          stream.addProperty("layout:width", getWidth());
          stream.addProperty("layout:height", getHeight());
          stream.addProperty("layout:layoutDirection", getLayoutDirection());
          stream.addProperty("layout:layoutRtl", isLayoutRtl());
          stream.addProperty("layout:hasTransientState", hasTransientState());
          stream.addProperty("layout:baseline", getBaseline());
  
          // layout params
          ViewGroup.LayoutParams layoutParams = getLayoutParams();
          if (layoutParams != null) {
              stream.addPropertyKey("layoutParams");
              layoutParams.encode(stream);
          }
  
          // scrolling
          stream.addProperty("scrolling:scrollX", mScrollX);
          stream.addProperty("scrolling:scrollY", mScrollY);
  
          // padding
          stream.addProperty("padding:paddingLeft", mPaddingLeft);
          stream.addProperty("padding:paddingRight", mPaddingRight);
          stream.addProperty("padding:paddingTop", mPaddingTop);
          stream.addProperty("padding:paddingBottom", mPaddingBottom);
          stream.addProperty("padding:userPaddingRight", mUserPaddingRight);
          stream.addProperty("padding:userPaddingLeft", mUserPaddingLeft);
          stream.addProperty("padding:userPaddingBottom", mUserPaddingBottom);
          stream.addProperty("padding:userPaddingStart", mUserPaddingStart);
          stream.addProperty("padding:userPaddingEnd", mUserPaddingEnd);
  
          // measurement
          stream.addProperty("measurement:minHeight", mMinHeight);
          stream.addProperty("measurement:minWidth", mMinWidth);
          stream.addProperty("measurement:measuredWidth", mMeasuredWidth);
          stream.addProperty("measurement:measuredHeight", mMeasuredHeight);
  
          // drawing
          stream.addProperty("drawing:elevation", getElevation());
          stream.addProperty("drawing:translationX", getTranslationX());
          stream.addProperty("drawing:translationY", getTranslationY());
          stream.addProperty("drawing:translationZ", getTranslationZ());
          stream.addProperty("drawing:rotation", getRotation());
          stream.addProperty("drawing:rotationX", getRotationX());
          stream.addProperty("drawing:rotationY", getRotationY());
          stream.addProperty("drawing:scaleX", getScaleX());
          stream.addProperty("drawing:scaleY", getScaleY());
          stream.addProperty("drawing:pivotX", getPivotX());
          stream.addProperty("drawing:pivotY", getPivotY());
          stream.addProperty("drawing:clipBounds",
                  mClipBounds == null ? null : mClipBounds.toString());
          stream.addProperty("drawing:opaque", isOpaque());
          stream.addProperty("drawing:alpha", getAlpha());
          stream.addProperty("drawing:transitionAlpha", getTransitionAlpha());
          stream.addProperty("drawing:shadow", hasShadow());
          stream.addProperty("drawing:solidColor", getSolidColor());
          stream.addProperty("drawing:layerType", mLayerType);
          stream.addProperty("drawing:willNotDraw", willNotDraw());
          stream.addProperty("drawing:hardwareAccelerated", isHardwareAccelerated());
          stream.addProperty("drawing:willNotCacheDrawing", willNotCacheDrawing());
          stream.addProperty("drawing:drawingCacheEnabled", isDrawingCacheEnabled());
          stream.addProperty("drawing:overlappingRendering", hasOverlappingRendering());
          stream.addProperty("drawing:outlineAmbientShadowColor", getOutlineAmbientShadowColor());
          stream.addProperty("drawing:outlineSpotShadowColor", getOutlineSpotShadowColor());
  
          // focus
          stream.addProperty("focus:hasFocus", hasFocus());
          stream.addProperty("focus:isFocused", isFocused());
          stream.addProperty("focus:focusable", getFocusable());
          stream.addProperty("focus:isFocusable", isFocusable());
          stream.addProperty("focus:isFocusableInTouchMode", isFocusableInTouchMode());
  
          stream.addProperty("misc:clickable", isClickable());
          stream.addProperty("misc:pressed", isPressed());
          stream.addProperty("misc:selected", isSelected());
          stream.addProperty("misc:touchMode", isInTouchMode());
          stream.addProperty("misc:hovered", isHovered());
          stream.addProperty("misc:activated", isActivated());
  
          stream.addProperty("misc:visibility", getVisibility());
          stream.addProperty("misc:fitsSystemWindows", getFitsSystemWindows());
          stream.addProperty("misc:filterTouchesWhenObscured", getFilterTouchesWhenObscured());
  
          stream.addProperty("misc:enabled", isEnabled());
          stream.addProperty("misc:soundEffectsEnabled", isSoundEffectsEnabled());
          stream.addProperty("misc:hapticFeedbackEnabled", isHapticFeedbackEnabled());
  
          // theme attributes
          Resources.Theme theme = getContext().getTheme();
          if (theme != null) {
              stream.addPropertyKey("theme");
              theme.encode(stream);
          }
  
          // view attribute information
          int n = mAttributes != null ? mAttributes.length : 0;
          stream.addProperty("meta:__attrCount__", n/2);
          for (int i = 0; i < n; i += 2) {
              stream.addProperty("meta:__attr__" + mAttributes[i], mAttributes[i+1]);
          }
  
          stream.addProperty("misc:scrollBarStyle", getScrollBarStyle());
  
          // text
          stream.addProperty("text:textDirection", getTextDirection());
          stream.addProperty("text:textAlignment", getTextAlignment());
  
          // accessibility
          CharSequence contentDescription = getContentDescription();
          stream.addProperty("accessibility:contentDescription",
                  contentDescription == null ? "" : contentDescription.toString());
          stream.addProperty("accessibility:labelFor", getLabelFor());
          stream.addProperty("accessibility:importantForAccessibility", getImportantForAccessibility());
      }
  
      /**
       * Determine if this view is rendered on a round wearable device and is the main view
       * on the screen.
       */
      boolean shouldDrawRoundScrollbar() {
          if (!mResources.getConfiguration().isScreenRound() || mAttachInfo == null) {
              return false;
          }
  
          final View rootView = getRootView();
          final WindowInsets insets = getRootWindowInsets();
  
          int height = getHeight();
          int width = getWidth();
          int displayHeight = rootView.getHeight();
          int displayWidth = rootView.getWidth();
  
          if (height != displayHeight || width != displayWidth) {
              return false;
          }
  
          getLocationInWindow(mAttachInfo.mTmpLocation);
          return mAttachInfo.mTmpLocation[0] == insets.getStableInsetLeft()
                  && mAttachInfo.mTmpLocation[1] == insets.getStableInsetTop();
      }
  
      /**
       * Sets the tooltip text which will be displayed in a small popup next to the view.
       * <p>
       * The tooltip will be displayed:
       * <ul>
       * <li>On long click, unless it is handled otherwise (by OnLongClickListener or a context
       * menu). </li>
       * <li>On hover, after a brief delay since the pointer has stopped moving </li>
       * </ul>
       * <p>
       * <strong>Note:</strong> Do not override this method, as it will have no
       * effect on the text displayed in the tooltip.
       *
       * @param tooltipText the tooltip text, or null if no tooltip is required
       * @see #getTooltipText()
       * @attr ref android.R.styleable#View_tooltipText
       */
      public void setTooltipText(@Nullable CharSequence tooltipText) {
          if (TextUtils.isEmpty(tooltipText)) {
              setFlags(0, TOOLTIP);
              hideTooltip();
              mTooltipInfo = null;
          } else {
              setFlags(TOOLTIP, TOOLTIP);
              if (mTooltipInfo == null) {
                  mTooltipInfo = new TooltipInfo();
                  mTooltipInfo.mShowTooltipRunnable = this::showHoverTooltip;
                  mTooltipInfo.mHideTooltipRunnable = this::hideTooltip;
                  mTooltipInfo.mHoverSlop = ViewConfiguration.get(mContext).getScaledHoverSlop();
                  mTooltipInfo.clearAnchorPos();
              }
              mTooltipInfo.mTooltipText = tooltipText;
          }
      }
  
      /**
       * @hide Binary compatibility stub. To be removed when we finalize O APIs.
       */
      @UnsupportedAppUsage
      public void setTooltip(@Nullable CharSequence tooltipText) {
          setTooltipText(tooltipText);
      }
  
      /**
       * Returns the view's tooltip text.
       *
       * <strong>Note:</strong> Do not override this method, as it will have no
       * effect on the text displayed in the tooltip. You must call
       * {@link #setTooltipText(CharSequence)} to modify the tooltip text.
       *
       * @return the tooltip text
       * @see #setTooltipText(CharSequence)
       * @attr ref android.R.styleable#View_tooltipText
       */
      @InspectableProperty
      @Nullable
      public CharSequence getTooltipText() {
          return mTooltipInfo != null ? mTooltipInfo.mTooltipText : null;
      }
  
      /**
       * @hide Binary compatibility stub. To be removed when we finalize O APIs.
       */
      @Nullable
      public CharSequence getTooltip() {
          return getTooltipText();
      }
  
      private boolean showTooltip(int x, int y, boolean fromLongClick) {
          if (mAttachInfo == null || mTooltipInfo == null) {
              return false;
          }
          if (fromLongClick && (mViewFlags & ENABLED_MASK) != ENABLED) {
              return false;
          }
          if (TextUtils.isEmpty(mTooltipInfo.mTooltipText)) {
              return false;
          }
          hideTooltip();
          mTooltipInfo.mTooltipFromLongClick = fromLongClick;
          mTooltipInfo.mTooltipPopup = new TooltipPopup(getContext());
          final boolean fromTouch = (mPrivateFlags3 & PFLAG3_FINGER_DOWN) == PFLAG3_FINGER_DOWN;
          mTooltipInfo.mTooltipPopup.show(this, x, y, fromTouch, mTooltipInfo.mTooltipText);
          mAttachInfo.mTooltipHost = this;
          // The available accessibility actions have changed
          notifyViewAccessibilityStateChangedIfNeeded(CONTENT_CHANGE_TYPE_UNDEFINED);
          return true;
      }
  
      @UnsupportedAppUsage
      void hideTooltip() {
          if (mTooltipInfo == null) {
              return;
          }
          removeCallbacks(mTooltipInfo.mShowTooltipRunnable);
          if (mTooltipInfo.mTooltipPopup == null) {
              return;
          }
          mTooltipInfo.mTooltipPopup.hide();
          mTooltipInfo.mTooltipPopup = null;
          mTooltipInfo.mTooltipFromLongClick = false;
          mTooltipInfo.clearAnchorPos();
          if (mAttachInfo != null) {
              mAttachInfo.mTooltipHost = null;
          }
          // The available accessibility actions have changed
          notifyViewAccessibilityStateChangedIfNeeded(CONTENT_CHANGE_TYPE_UNDEFINED);
      }
  
      private boolean showLongClickTooltip(int x, int y) {
          removeCallbacks(mTooltipInfo.mShowTooltipRunnable);
          removeCallbacks(mTooltipInfo.mHideTooltipRunnable);
          return showTooltip(x, y, true);
      }
  
      private boolean showHoverTooltip() {
          return showTooltip(mTooltipInfo.mAnchorX, mTooltipInfo.mAnchorY, false);
      }
  
      boolean dispatchTooltipHoverEvent(MotionEvent event) {
          if (mTooltipInfo == null) {
              return false;
          }
          switch(event.getAction()) {
              case MotionEvent.ACTION_HOVER_MOVE:
                  if ((mViewFlags & TOOLTIP) != TOOLTIP) {
                      break;
                  }
                  if (!mTooltipInfo.mTooltipFromLongClick && mTooltipInfo.updateAnchorPos(event)) {
                      if (mTooltipInfo.mTooltipPopup == null) {
                          // Schedule showing the tooltip after a timeout.
                          removeCallbacks(mTooltipInfo.mShowTooltipRunnable);
                          postDelayed(mTooltipInfo.mShowTooltipRunnable,
                                  ViewConfiguration.getHoverTooltipShowTimeout());
                      }
  
                      // Hide hover-triggered tooltip after a period of inactivity.
                      // Match the timeout used by NativeInputManager to hide the mouse pointer
                      // (depends on SYSTEM_UI_FLAG_LOW_PROFILE being set).
                      final int timeout;
                      if ((getWindowSystemUiVisibility() & SYSTEM_UI_FLAG_LOW_PROFILE)
                              == SYSTEM_UI_FLAG_LOW_PROFILE) {
                          timeout = ViewConfiguration.getHoverTooltipHideShortTimeout();
                      } else {
                          timeout = ViewConfiguration.getHoverTooltipHideTimeout();
                      }
                      removeCallbacks(mTooltipInfo.mHideTooltipRunnable);
                      postDelayed(mTooltipInfo.mHideTooltipRunnable, timeout);
                  }
                  return true;
  
              case MotionEvent.ACTION_HOVER_EXIT:
                  mTooltipInfo.clearAnchorPos();
                  if (!mTooltipInfo.mTooltipFromLongClick) {
                      hideTooltip();
                  }
                  break;
          }
          return false;
      }
  
      void handleTooltipKey(KeyEvent event) {
          switch (event.getAction()) {
              case KeyEvent.ACTION_DOWN:
                  if (event.getRepeatCount() == 0) {
                      hideTooltip();
                  }
                  break;
  
              case KeyEvent.ACTION_UP:
                  handleTooltipUp();
                  break;
          }
      }
  
      private void handleTooltipUp() {
          if (mTooltipInfo == null || mTooltipInfo.mTooltipPopup == null) {
              return;
          }
          removeCallbacks(mTooltipInfo.mHideTooltipRunnable);
          postDelayed(mTooltipInfo.mHideTooltipRunnable,
                  ViewConfiguration.getLongPressTooltipHideTimeout());
      }
  
      private int getFocusableAttribute(TypedArray attributes) {
          TypedValue val = new TypedValue();
          if (attributes.getValue(com.android.internal.R.styleable.View_focusable, val)) {
              if (val.type == TypedValue.TYPE_INT_BOOLEAN) {
                  return (val.data == 0 ? NOT_FOCUSABLE : FOCUSABLE);
              } else {
                  return val.data;
              }
          } else {
              return FOCUSABLE_AUTO;
          }
      }
  
      /**
       * @return The content view of the tooltip popup currently being shown, or null if the tooltip
       * is not showing.
       * @hide
       */
      @TestApi
      public View getTooltipView() {
          if (mTooltipInfo == null || mTooltipInfo.mTooltipPopup == null) {
              return null;
          }
          return mTooltipInfo.mTooltipPopup.getContentView();
      }
  
      /**
       * @return {@code true} if the default focus highlight is enabled, {@code false} otherwies.
       * @hide
       */
      @TestApi
      public static boolean isDefaultFocusHighlightEnabled() {
          return sUseDefaultFocusHighlight;
      }
  
      /**
       * Dispatch a previously unhandled {@link KeyEvent} to this view. Unlike normal key dispatch,
       * this dispatches to ALL child views until it is consumed. The dispatch order is z-order
       * (visually on-top views first).
       *
       * @param evt the previously unhandled {@link KeyEvent}.
       * @return the {@link View} which consumed the event or {@code null} if not consumed.
       */
      View dispatchUnhandledKeyEvent(KeyEvent evt) {
          if (onUnhandledKeyEvent(evt)) {
              return this;
          }
          return null;
      }
  
      /**
       * Allows this view to handle {@link KeyEvent}s which weren't handled by normal dispatch. This
       * occurs after the normal view hierarchy dispatch, but before the window callback. By default,
       * this will dispatch into all the listeners registered via
       * {@link #addOnUnhandledKeyEventListener(OnUnhandledKeyEventListener)} in last-in-first-out
       * order (most recently added will receive events first).
       *
       * @param event An unhandled event.
       * @return {@code true} if the event was handled, {@code false} otherwise.
       * @see #addOnUnhandledKeyEventListener
       */
      boolean onUnhandledKeyEvent(@NonNull KeyEvent event) {
          if (mListenerInfo != null && mListenerInfo.mUnhandledKeyListeners != null) {
              for (int i = mListenerInfo.mUnhandledKeyListeners.size() - 1; i >= 0; --i) {
                  if (mListenerInfo.mUnhandledKeyListeners.get(i).onUnhandledKeyEvent(this, event)) {
                      return true;
                  }
              }
          }
          return false;
      }
  
      boolean hasUnhandledKeyListener() {
          return (mListenerInfo != null && mListenerInfo.mUnhandledKeyListeners != null
                  && !mListenerInfo.mUnhandledKeyListeners.isEmpty());
      }
  
      /**
       * Adds a listener which will receive unhandled {@link KeyEvent}s. This must be called on the
       * UI thread.
       *
       * @param listener a receiver of unhandled {@link KeyEvent}s.
       * @see #removeOnUnhandledKeyEventListener
       */
      public void addOnUnhandledKeyEventListener(OnUnhandledKeyEventListener listener) {
          ArrayList<OnUnhandledKeyEventListener> listeners = getListenerInfo().mUnhandledKeyListeners;
          if (listeners == null) {
              listeners = new ArrayList<>();
              getListenerInfo().mUnhandledKeyListeners = listeners;
          }
          listeners.add(listener);
          if (listeners.size() == 1 && mParent instanceof ViewGroup) {
              ((ViewGroup) mParent).incrementChildUnhandledKeyListeners();
          }
      }
  
      /**
       * Removes a listener which will receive unhandled {@link KeyEvent}s. This must be called on the
       * UI thread.
       *
       * @param listener a receiver of unhandled {@link KeyEvent}s.
       * @see #addOnUnhandledKeyEventListener
       */
      public void removeOnUnhandledKeyEventListener(OnUnhandledKeyEventListener listener) {
          if (mListenerInfo != null) {
              if (mListenerInfo.mUnhandledKeyListeners != null
                      && !mListenerInfo.mUnhandledKeyListeners.isEmpty()) {
                  mListenerInfo.mUnhandledKeyListeners.remove(listener);
                  if (mListenerInfo.mUnhandledKeyListeners.isEmpty()) {
                      mListenerInfo.mUnhandledKeyListeners = null;
                      if (mParent instanceof ViewGroup) {
                          ((ViewGroup) mParent).decrementChildUnhandledKeyListeners();
                      }
                  }
              }
          }
      }
  }
  