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.webkit;
  
  import android.annotation.CallbackExecutor;
  import android.annotation.IntDef;
  import android.annotation.NonNull;
  import android.annotation.Nullable;
  import android.annotation.SystemApi;
  import android.annotation.UnsupportedAppUsage;
  import android.annotation.Widget;
  import android.content.Context;
  import android.content.Intent;
  import android.content.pm.PackageInfo;
  import android.content.res.Configuration;
  import android.graphics.Bitmap;
  import android.graphics.Canvas;
  import android.graphics.Paint;
  import android.graphics.Picture;
  import android.graphics.Rect;
  import android.graphics.drawable.Drawable;
  import android.net.Uri;
  import android.net.http.SslCertificate;
  import android.os.Build;
  import android.os.Bundle;
  import android.os.Handler;
  import android.os.Looper;
  import android.os.Message;
  import android.os.RemoteException;
  import android.os.StrictMode;
  import android.print.PrintDocumentAdapter;
  import android.util.AttributeSet;
  import android.util.Log;
  import android.util.SparseArray;
  import android.view.DragEvent;
  import android.view.KeyEvent;
  import android.view.MotionEvent;
  import android.view.View;
  import android.view.ViewDebug;
  import android.view.ViewGroup;
  import android.view.ViewHierarchyEncoder;
  import android.view.ViewStructure;
  import android.view.ViewTreeObserver;
  import android.view.accessibility.AccessibilityEvent;
  import android.view.accessibility.AccessibilityNodeInfo;
  import android.view.accessibility.AccessibilityNodeProvider;
  import android.view.autofill.AutofillValue;
  import android.view.inputmethod.EditorInfo;
  import android.view.inputmethod.InputConnection;
  import android.view.inspector.InspectableProperty;
  import android.view.textclassifier.TextClassifier;
  import android.widget.AbsoluteLayout;
  
  import java.io.BufferedWriter;
  import java.io.File;
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.Executor;
  
  /**
   * A View that displays web pages.
   *
   * <h3>Basic usage</h3>
   *
   *
   * <p>In most cases, we recommend using a standard web browser, like Chrome, to deliver
   * content to the user. To learn more about web browsers, read the guide on
   * <a href="/guide/components/intents-common#Browser">
   * invoking a browser with an intent</a>.
   *
   * <p>WebView objects allow you to display web content as part of your activity layout, but
   * lack some of the features of fully-developed browsers. A WebView is useful when
   * you need increased control over the UI and advanced configuration options that will allow
   * you to embed web pages in a specially-designed environment for your app.
   *
   * <p>To learn more about WebView and alternatives for serving web content, read the
   * documentation on
   * <a href="/guide/webapps/">
   * Web-based content</a>.
   *
   */
  // Implementation notes.
  // The WebView is a thin API class that delegates its public API to a backend WebViewProvider
  // class instance. WebView extends {@link AbsoluteLayout} for backward compatibility reasons.
  // Methods are delegated to the provider implementation: all public API methods introduced in this
  // file are fully delegated, whereas public and protected methods from the View base classes are
  // only delegated where a specific need exists for them to do so.
  @Widget
  public class WebView extends AbsoluteLayout
          implements ViewTreeObserver.OnGlobalFocusChangeListener,
          ViewGroup.OnHierarchyChangeListener, ViewDebug.HierarchyHandler {
  
      private static final String LOGTAG = "WebView";
  
      // Throwing an exception for incorrect thread usage if the
      // build target is JB MR2 or newer. Defaults to false, and is
      // set in the WebView constructor.
      @UnsupportedAppUsage
      private static volatile boolean sEnforceThreadChecking = false;
  
      /**
       *  Transportation object for returning WebView across thread boundaries.
       */
      public class WebViewTransport {
          private WebView mWebview;
  
          /**
           * Sets the WebView to the transportation object.
           *
           * @param webview the WebView to transport
           */
          public synchronized void setWebView(WebView webview) {
              mWebview = webview;
          }
  
          /**
           * Gets the WebView object.
           *
           * @return the transported WebView object
           */
          public synchronized WebView getWebView() {
              return mWebview;
          }
      }
  
      /**
       * URI scheme for telephone number.
       */
      public static final String SCHEME_TEL = "tel:";
      /**
       * URI scheme for email address.
       */
      public static final String SCHEME_MAILTO = "mailto:";
      /**
       * URI scheme for map address.
       */
      public static final String SCHEME_GEO = "geo:0,0?q=";
  
      /**
       * Interface to listen for find results.
       */
      public interface FindListener {
          /**
           * Notifies the listener about progress made by a find operation.
           *
           * @param activeMatchOrdinal the zero-based ordinal of the currently selected match
           * @param numberOfMatches how many matches have been found
           * @param isDoneCounting whether the find operation has actually completed. The listener
           *                       may be notified multiple times while the
           *                       operation is underway, and the numberOfMatches
           *                       value should not be considered final unless
           *                       isDoneCounting is {@code true}.
           */
          public void onFindResultReceived(int activeMatchOrdinal, int numberOfMatches,
              boolean isDoneCounting);
      }
  
      /**
       * Callback interface supplied to {@link #postVisualStateCallback} for receiving
       * notifications about the visual state.
       */
      public static abstract class VisualStateCallback {
          /**
           * Invoked when the visual state is ready to be drawn in the next {@link #onDraw}.
           *
           * @param requestId The identifier passed to {@link #postVisualStateCallback} when this
           *                  callback was posted.
           */
          public abstract void onComplete(long requestId);
      }
  
      /**
       * Interface to listen for new pictures as they change.
       *
       * @deprecated This interface is now obsolete.
       */
      @Deprecated
      public interface PictureListener {
          /**
           * Used to provide notification that the WebView's picture has changed.
           * See {@link WebView#capturePicture} for details of the picture.
           *
           * @param view the WebView that owns the picture
           * @param picture the new picture. Applications targeting
           *     {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR2} or above
           *     will always receive a {@code null} Picture.
           * @deprecated Deprecated due to internal changes.
           */
          @Deprecated
          void onNewPicture(WebView view, @Nullable Picture picture);
      }
  
      public static class HitTestResult {
          /**
           * Default HitTestResult, where the target is unknown.
           */
          public static final int UNKNOWN_TYPE = 0;
          /**
           * @deprecated This type is no longer used.
           */
          @Deprecated
          public static final int ANCHOR_TYPE = 1;
          /**
           * HitTestResult for hitting a phone number.
           */
          public static final int PHONE_TYPE = 2;
          /**
           * HitTestResult for hitting a map address.
           */
          public static final int GEO_TYPE = 3;
          /**
           * HitTestResult for hitting an email address.
           */
          public static final int EMAIL_TYPE = 4;
          /**
           * HitTestResult for hitting an HTML::img tag.
           */
          public static final int IMAGE_TYPE = 5;
          /**
           * @deprecated This type is no longer used.
           */
          @Deprecated
          public static final int IMAGE_ANCHOR_TYPE = 6;
          /**
           * HitTestResult for hitting a HTML::a tag with src=http.
           */
          public static final int SRC_ANCHOR_TYPE = 7;
          /**
           * HitTestResult for hitting a HTML::a tag with src=http + HTML::img.
           */
          public static final int SRC_IMAGE_ANCHOR_TYPE = 8;
          /**
           * HitTestResult for hitting an edit text area.
           */
          public static final int EDIT_TEXT_TYPE = 9;
  
          private int mType;
          private String mExtra;
  
          /**
           * @hide Only for use by WebViewProvider implementations
           */
          @SystemApi
          public HitTestResult() {
              mType = UNKNOWN_TYPE;
          }
  
          /**
           * @hide Only for use by WebViewProvider implementations
           */
          @SystemApi
          public void setType(int type) {
              mType = type;
          }
  
          /**
           * @hide Only for use by WebViewProvider implementations
           */
          @SystemApi
          public void setExtra(String extra) {
              mExtra = extra;
          }
  
          /**
           * Gets the type of the hit test result. See the XXX_TYPE constants
           * defined in this class.
           *
           * @return the type of the hit test result
           */
          public int getType() {
              return mType;
          }
  
          /**
           * Gets additional type-dependant information about the result. See
           * {@link WebView#getHitTestResult()} for details. May either be {@code null}
           * or contain extra information about this result.
           *
           * @return additional type-dependant information about the result
           */
          @Nullable
          public String getExtra() {
              return mExtra;
          }
      }
  
      /**
       * Constructs a new WebView with an Activity Context object.
       *
       * <p class="note"><b>Note:</b> WebView should always be instantiated with an Activity Context.
       * If instantiated with an Application Context, WebView will be unable to provide several
       * features, such as JavaScript dialogs and autofill.
       *
       * @param context an Activity Context to access application assets
       */
      public WebView(Context context) {
          this(context, null);
      }
  
      /**
       * Constructs a new WebView with layout parameters.
       *
       * @param context an Activity Context to access application assets
       * @param attrs an AttributeSet passed to our parent
       */
      public WebView(Context context, AttributeSet attrs) {
          this(context, attrs, com.android.internal.R.attr.webViewStyle);
      }
  
      /**
       * Constructs a new WebView with layout parameters and a default style.
       *
       * @param context an Activity Context to access application assets
       * @param attrs an AttributeSet passed to our parent
       * @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.
       */
      public WebView(Context context, AttributeSet attrs, int defStyleAttr) {
          this(context, attrs, defStyleAttr, 0);
      }
  
      /**
       * Constructs a new WebView with layout parameters and a default style.
       *
       * @param context an Activity Context to access application assets
       * @param attrs an AttributeSet passed to our parent
       * @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.
       */
      public WebView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
          this(context, attrs, defStyleAttr, defStyleRes, null, false);
      }
  
      /**
       * Constructs a new WebView with layout parameters and a default style.
       *
       * @param context an Activity Context to access application assets
       * @param attrs an AttributeSet passed to our parent
       * @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 privateBrowsing whether this WebView will be initialized in
       *                        private mode
       *
       * @deprecated Private browsing is no longer supported directly via
       * WebView and will be removed in a future release. Prefer using
       * {@link WebSettings}, {@link WebViewDatabase}, {@link CookieManager}
       * and {@link WebStorage} for fine-grained control of privacy data.
       */
      @Deprecated
      public WebView(Context context, AttributeSet attrs, int defStyleAttr,
              boolean privateBrowsing) {
          this(context, attrs, defStyleAttr, 0, null, privateBrowsing);
      }
  
      /**
       * Constructs a new WebView with layout parameters, a default style and a set
       * of custom JavaScript interfaces to be added to this WebView at initialization
       * time. This guarantees that these interfaces will be available when the JS
       * context is initialized.
       *
       * @param context an Activity Context to access application assets
       * @param attrs an AttributeSet passed to our parent
       * @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 javaScriptInterfaces a Map of interface names, as keys, and
       *                             object implementing those interfaces, as
       *                             values
       * @param privateBrowsing whether this WebView will be initialized in
       *                        private mode
       * @hide This is used internally by dumprendertree, as it requires the JavaScript interfaces to
       *       be added synchronously, before a subsequent loadUrl call takes effect.
       */
      @UnsupportedAppUsage
      protected WebView(Context context, AttributeSet attrs, int defStyleAttr,
              Map<String, Object> javaScriptInterfaces, boolean privateBrowsing) {
          this(context, attrs, defStyleAttr, 0, javaScriptInterfaces, privateBrowsing);
      }
  
      /**
       * @hide
       */
      @SuppressWarnings("deprecation")  // for super() call into deprecated base class constructor.
      @UnsupportedAppUsage
      protected WebView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes,
              Map<String, Object> javaScriptInterfaces, boolean privateBrowsing) {
          super(context, attrs, defStyleAttr, defStyleRes);
  
          // WebView is important by default, unless app developer overrode attribute.
          if (getImportantForAutofill() == IMPORTANT_FOR_AUTOFILL_AUTO) {
              setImportantForAutofill(IMPORTANT_FOR_AUTOFILL_YES);
          }
          if (getImportantForContentCapture() == IMPORTANT_FOR_CONTENT_CAPTURE_AUTO) {
              setImportantForContentCapture(IMPORTANT_FOR_CONTENT_CAPTURE_YES);
          }
  
          if (context == null) {
              throw new IllegalArgumentException("Invalid context argument");
          }
          if (mWebViewThread == null) {
              throw new RuntimeException(
                  "WebView cannot be initialized on a thread that has no Looper.");
          }
          sEnforceThreadChecking = context.getApplicationInfo().targetSdkVersion >=
                  Build.VERSION_CODES.JELLY_BEAN_MR2;
          checkThread();
  
          ensureProviderCreated();
          mProvider.init(javaScriptInterfaces, privateBrowsing);
          // Post condition of creating a webview is the CookieSyncManager.getInstance() is allowed.
          CookieSyncManager.setGetInstanceIsAllowed();
      }
  
      /**
       * Specifies whether the horizontal scrollbar has overlay style.
       *
       * @deprecated This method has no effect.
       * @param overlay {@code true} if horizontal scrollbar should have overlay style
       */
      @Deprecated
      public void setHorizontalScrollbarOverlay(boolean overlay) {
      }
  
      /**
       * Specifies whether the vertical scrollbar has overlay style.
       *
       * @deprecated This method has no effect.
       * @param overlay {@code true} if vertical scrollbar should have overlay style
       */
      @Deprecated
      public void setVerticalScrollbarOverlay(boolean overlay) {
      }
  
      /**
       * Gets whether horizontal scrollbar has overlay style.
       *
       * @deprecated This method is now obsolete.
       * @return {@code true}
       */
      @Deprecated
      public boolean overlayHorizontalScrollbar() {
          // The old implementation defaulted to true, so return true for consistency
          return true;
      }
  
      /**
       * Gets whether vertical scrollbar has overlay style.
       *
       * @deprecated This method is now obsolete.
       * @return {@code false}
       */
      @Deprecated
      public boolean overlayVerticalScrollbar() {
          // The old implementation defaulted to false, so return false for consistency
          return false;
      }
  
      /**
       * Gets the visible height (in pixels) of the embedded title bar (if any).
       *
       * @deprecated This method is now obsolete.
       * @hide Since API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
       */
      @Deprecated
      @UnsupportedAppUsage
      public int getVisibleTitleHeight() {
          checkThread();
          return mProvider.getVisibleTitleHeight();
      }
  
      /**
       * Gets the SSL certificate for the main top-level page or {@code null} if there is
       * no certificate (the site is not secure).
       *
       * @return the SSL certificate for the main top-level page
       */
      @Nullable
      public SslCertificate getCertificate() {
          checkThread();
          return mProvider.getCertificate();
      }
  
      /**
       * Sets the SSL certificate for the main top-level page.
       *
       * @deprecated Calling this function has no useful effect, and will be
       * ignored in future releases.
       */
      @Deprecated
      public void setCertificate(SslCertificate certificate) {
          checkThread();
          mProvider.setCertificate(certificate);
      }
  
      //-------------------------------------------------------------------------
      // Methods called by activity
      //-------------------------------------------------------------------------
  
      /**
       * Sets a username and password pair for the specified host. This data is
       * used by the WebView to autocomplete username and password fields in web
       * forms. Note that this is unrelated to the credentials used for HTTP
       * authentication.
       *
       * @param host the host that required the credentials
       * @param username the username for the given host
       * @param password the password for the given host
       * @see WebViewDatabase#clearUsernamePassword
       * @see WebViewDatabase#hasUsernamePassword
       * @deprecated Saving passwords in WebView will not be supported in future versions.
       */
      @Deprecated
      public void savePassword(String host, String username, String password) {
          checkThread();
          mProvider.savePassword(host, username, password);
      }
  
      /**
       * Stores HTTP authentication credentials for a given host and realm to the {@link WebViewDatabase}
       * instance.
       *
       * @param host the host to which the credentials apply
       * @param realm the realm to which the credentials apply
       * @param username the username
       * @param password the password
       * @deprecated Use {@link WebViewDatabase#setHttpAuthUsernamePassword} instead
       */
      @Deprecated
      public void setHttpAuthUsernamePassword(String host, String realm,
              String username, String password) {
          checkThread();
          mProvider.setHttpAuthUsernamePassword(host, realm, username, password);
      }
  
      /**
       * Retrieves HTTP authentication credentials for a given host and realm from the {@link
       * WebViewDatabase} instance.
       * @param host the host to which the credentials apply
       * @param realm the realm to which the credentials apply
       * @return the credentials as a String array, if found. The first element
       *         is the username and the second element is the password. {@code null} if
       *         no credentials are found.
       * @deprecated Use {@link WebViewDatabase#getHttpAuthUsernamePassword} instead
       */
      @Deprecated
      @Nullable
      public String[] getHttpAuthUsernamePassword(String host, String realm) {
          checkThread();
          return mProvider.getHttpAuthUsernamePassword(host, realm);
      }
  
      /**
       * Destroys the internal state of this WebView. This method should be called
       * after this WebView has been removed from the view system. No other
       * methods may be called on this WebView after destroy.
       */
      public void destroy() {
          checkThread();
          mProvider.destroy();
      }
  
      /**
       * Enables platform notifications of data state and proxy changes.
       * Notifications are enabled by default.
       *
       * @deprecated This method is now obsolete.
       * @hide Since API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
       */
      @Deprecated
      @UnsupportedAppUsage
      public static void enablePlatformNotifications() {
          // noop
      }
  
      /**
       * Disables platform notifications of data state and proxy changes.
       * Notifications are enabled by default.
       *
       * @deprecated This method is now obsolete.
       * @hide Since API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
       */
      @Deprecated
      @UnsupportedAppUsage
      public static void disablePlatformNotifications() {
          // noop
      }
  
      /**
       * Used only by internal tests to free up memory.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public static void freeMemoryForTests() {
          getFactory().getStatics().freeMemoryForTests();
      }
  
      /**
       * Informs WebView of the network state. This is used to set
       * the JavaScript property window.navigator.isOnline and
       * generates the online/offline event as specified in HTML5, sec. 5.7.7
       *
       * @param networkUp a boolean indicating if network is available
       */
      public void setNetworkAvailable(boolean networkUp) {
          checkThread();
          mProvider.setNetworkAvailable(networkUp);
      }
  
      /**
       * Saves the state of this WebView used in
       * {@link android.app.Activity#onSaveInstanceState}. Please note that this
       * method no longer stores the display data for this WebView. The previous
       * behavior could potentially leak files if {@link #restoreState} was never
       * called.
       *
       * @param outState the Bundle to store this WebView's state
       * @return the same copy of the back/forward list used to save the state, {@code null} if the
       *         method fails.
       */
      @Nullable
      public WebBackForwardList saveState(Bundle outState) {
          checkThread();
          return mProvider.saveState(outState);
      }
  
      /**
       * Saves the current display data to the Bundle given. Used in conjunction
       * with {@link #saveState}.
       * @param b a Bundle to store the display data
       * @param dest the file to store the serialized picture data. Will be
       *             overwritten with this WebView's picture data.
       * @return {@code true} if the picture was successfully saved
       * @deprecated This method is now obsolete.
       * @hide Since API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
       */
      @Deprecated
      @UnsupportedAppUsage
      public boolean savePicture(Bundle b, final File dest) {
          checkThread();
          return mProvider.savePicture(b, dest);
      }
  
      /**
       * Restores the display data that was saved in {@link #savePicture}. Used in
       * conjunction with {@link #restoreState}. Note that this will not work if
       * this WebView is hardware accelerated.
       *
       * @param b a Bundle containing the saved display data
       * @param src the file where the picture data was stored
       * @return {@code true} if the picture was successfully restored
       * @deprecated This method is now obsolete.
       * @hide Since API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
       */
      @Deprecated
      @UnsupportedAppUsage
      public boolean restorePicture(Bundle b, File src) {
          checkThread();
          return mProvider.restorePicture(b, src);
      }
  
      /**
       * Restores the state of this WebView from the given Bundle. This method is
       * intended for use in {@link android.app.Activity#onRestoreInstanceState}
       * and should be called to restore the state of this WebView. If
       * it is called after this WebView has had a chance to build state (load
       * pages, create a back/forward list, etc.) there may be undesirable
       * side-effects. Please note that this method no longer restores the
       * display data for this WebView.
       *
       * @param inState the incoming Bundle of state
       * @return the restored back/forward list or {@code null} if restoreState failed
       */
      @Nullable
      public WebBackForwardList restoreState(Bundle inState) {
          checkThread();
          return mProvider.restoreState(inState);
      }
  
      /**
       * Loads the given URL with the specified additional HTTP headers.
       * <p>
       * Also see compatibility note on {@link #evaluateJavascript}.
       *
       * @param url the URL of the resource to load
       * @param additionalHttpHeaders the additional headers to be used in the
       *            HTTP request for this URL, specified as a map from name to
       *            value. Note that if this map contains any of the headers
       *            that are set by default by this WebView, such as those
       *            controlling caching, accept types or the User-Agent, their
       *            values may be overridden by this WebView's defaults.
       */
      public void loadUrl(String url, Map<String, String> additionalHttpHeaders) {
          checkThread();
          mProvider.loadUrl(url, additionalHttpHeaders);
      }
  
      /**
       * Loads the given URL.
       * <p>
       * Also see compatibility note on {@link #evaluateJavascript}.
       *
       * @param url the URL of the resource to load
       */
      public void loadUrl(String url) {
          checkThread();
          mProvider.loadUrl(url);
      }
  
      /**
       * Loads the URL with postData using "POST" method into this WebView. If url
       * is not a network URL, it will be loaded with {@link #loadUrl(String)}
       * instead, ignoring the postData param.
       *
       * @param url the URL of the resource to load
       * @param postData the data will be passed to "POST" request, which must be
       *     be "application/x-www-form-urlencoded" encoded.
       */
      public void postUrl(String url, byte[] postData) {
          checkThread();
          if (URLUtil.isNetworkUrl(url)) {
              mProvider.postUrl(url, postData);
          } else {
              mProvider.loadUrl(url);
          }
      }
  
      /**
       * Loads the given data into this WebView using a 'data' scheme URL.
       * <p>
       * Note that JavaScript's same origin policy means that script running in a
       * page loaded using this method will be unable to access content loaded
       * using any scheme other than 'data', including 'http(s)'. To avoid this
       * restriction, use {@link
       * #loadDataWithBaseURL(String,String,String,String,String)
       * loadDataWithBaseURL()} with an appropriate base URL.
       * <p>
       * The {@code encoding} parameter specifies whether the data is base64 or URL
       * encoded. If the data is base64 encoded, the value of the encoding
       * parameter must be {@code "base64"}. HTML can be encoded with {@link
       * android.util.Base64#encodeToString(byte[],int)} like so:
       * <pre class="prettyprint">
       * String unencodedHtml =
       *     "&lt;html&gt;&lt;body&gt;'%28' is the code for '('&lt;/body&gt;&lt;/html&gt;";
       * String encodedHtml = Base64.encodeToString(unencodedHtml.getBytes(), Base64.NO_PADDING);
       * webView.loadData(encodedHtml, "text/html", "base64");
       * </pre>
       * <p class="note">
       * For all other values of {@code encoding} (including {@code null}) it is assumed that the
       * data uses ASCII encoding for octets inside the range of safe URL characters and use the
       * standard %xx hex encoding of URLs for octets outside that range. See <a
       * href="https://tools.ietf.org/html/rfc3986#section-2.2">RFC 3986</a> for more information.
       * Applications targeting {@link android.os.Build.VERSION_CODES#Q} or later must either use
       * base64 or encode any {@code #} characters in the content as {@code %23}, otherwise they
       * will be treated as the end of the content and the remaining text used as a document
       * fragment identifier.
       * <p>
       * The {@code mimeType} parameter specifies the format of the data.
       * If WebView can't handle the specified MIME type, it will download the data.
       * If {@code null}, defaults to 'text/html'.
       * <p>
       * The 'data' scheme URL formed by this method uses the default US-ASCII
       * charset. If you need to set a different charset, you should form a
       * 'data' scheme URL which explicitly specifies a charset parameter in the
       * mediatype portion of the URL and call {@link #loadUrl(String)} instead.
       * Note that the charset obtained from the mediatype portion of a data URL
       * always overrides that specified in the HTML or XML document itself.
       * <p>
       * Content loaded using this method will have a {@code window.origin} value
       * of {@code "null"}. This must not be considered to be a trusted origin
       * by the application or by any JavaScript code running inside the WebView
       * (for example, event sources in DOM event handlers or web messages),
       * because malicious content can also create frames with a null origin. If
       * you need to identify the main frame's origin in a trustworthy way, you
       * should use {@link #loadDataWithBaseURL(String,String,String,String,String)
       * loadDataWithBaseURL()} with a valid HTTP or HTTPS base URL to set the
       * origin.
       *
       * @param data a String of data in the given encoding
       * @param mimeType the MIME type of the data, e.g. 'text/html'.
       * @param encoding the encoding of the data
       */
      public void loadData(String data, @Nullable String mimeType, @Nullable String encoding) {
          checkThread();
          mProvider.loadData(data, mimeType, encoding);
      }
  
      /**
       * Loads the given data into this WebView, using baseUrl as the base URL for
       * the content. The base URL is used both to resolve relative URLs and when
       * applying JavaScript's same origin policy. The historyUrl is used for the
       * history entry.
       * <p>
       * The {@code mimeType} parameter specifies the format of the data.
       * If WebView can't handle the specified MIME type, it will download the data.
       * If {@code null}, defaults to 'text/html'.
       * <p>
       * Note that content specified in this way can access local device files
       * (via 'file' scheme URLs) only if baseUrl specifies a scheme other than
       * 'http', 'https', 'ftp', 'ftps', 'about' or 'javascript'.
       * <p>
       * If the base URL uses the data scheme, this method is equivalent to
       * calling {@link #loadData(String,String,String) loadData()} and the
       * historyUrl is ignored, and the data will be treated as part of a data: URL,
       * including the requirement that the content be URL-encoded or base64 encoded.
       * If the base URL uses any other scheme, then the data will be loaded into
       * the WebView as a plain string (i.e. not part of a data URL) and any URL-encoded
       * entities in the string will not be decoded.
       * <p>
       * Note that the baseUrl is sent in the 'Referer' HTTP header when
       * requesting subresources (images, etc.) of the page loaded using this method.
       * <p>
       * If a valid HTTP or HTTPS base URL is not specified in {@code baseUrl}, then
       * content loaded using this method will have a {@code window.origin} value
       * of {@code "null"}. This must not be considered to be a trusted origin
       * by the application or by any JavaScript code running inside the WebView
       * (for example, event sources in DOM event handlers or web messages),
       * because malicious content can also create frames with a null origin. If
       * you need to identify the main frame's origin in a trustworthy way, you
       * should use a valid HTTP or HTTPS base URL to set the origin.
       *
       * @param baseUrl the URL to use as the page's base URL. If {@code null} defaults to
       *                'about:blank'.
       * @param data a String of data in the given encoding
       * @param mimeType the MIME type of the data, e.g. 'text/html'.
       * @param encoding the encoding of the data
       * @param historyUrl the URL to use as the history entry. If {@code null} defaults
       *                   to 'about:blank'. If non-null, this must be a valid URL.
       */
      public void loadDataWithBaseURL(@Nullable String baseUrl, String data,
              @Nullable String mimeType, @Nullable String encoding, @Nullable String historyUrl) {
          checkThread();
          mProvider.loadDataWithBaseURL(baseUrl, data, mimeType, encoding, historyUrl);
      }
  
      /**
       * Asynchronously evaluates JavaScript in the context of the currently displayed page.
       * If non-null, {@code resultCallback} will be invoked with any result returned from that
       * execution. This method must be called on the UI thread and the callback will
       * be made on the UI thread.
       * <p>
       * Compatibility note. Applications targeting {@link android.os.Build.VERSION_CODES#N} or
       * later, JavaScript state from an empty WebView is no longer persisted across navigations like
       * {@link #loadUrl(String)}. For example, global variables and functions defined before calling
       * {@link #loadUrl(String)} will not exist in the loaded page. Applications should use
       * {@link #addJavascriptInterface} instead to persist JavaScript objects across navigations.
       *
       * @param script the JavaScript to execute.
       * @param resultCallback A callback to be invoked when the script execution
       *                       completes with the result of the execution (if any).
       *                       May be {@code null} if no notification of the result is required.
       */
      public void evaluateJavascript(String script, @Nullable ValueCallback<String> resultCallback) {
          checkThread();
          mProvider.evaluateJavaScript(script, resultCallback);
      }
  
      /**
       * Saves the current view as a web archive.
       *
       * @param filename the filename where the archive should be placed
       */
      public void saveWebArchive(String filename) {
          checkThread();
          mProvider.saveWebArchive(filename);
      }
  
      /**
       * Saves the current view as a web archive.
       *
       * @param basename the filename where the archive should be placed
       * @param autoname if {@code false}, takes basename to be a file. If {@code true}, basename
       *                 is assumed to be a directory in which a filename will be
       *                 chosen according to the URL of the current page.
       * @param callback called after the web archive has been saved. The
       *                 parameter for onReceiveValue will either be the filename
       *                 under which the file was saved, or {@code null} if saving the
       *                 file failed.
       */
      public void saveWebArchive(String basename, boolean autoname, @Nullable ValueCallback<String>
              callback) {
          checkThread();
          mProvider.saveWebArchive(basename, autoname, callback);
      }
  
      /**
       * Stops the current load.
       */
      public void stopLoading() {
          checkThread();
          mProvider.stopLoading();
      }
  
      /**
       * Reloads the current URL.
       */
      public void reload() {
          checkThread();
          mProvider.reload();
      }
  
      /**
       * Gets whether this WebView has a back history item.
       *
       * @return {@code true} if this WebView has a back history item
       */
      public boolean canGoBack() {
          checkThread();
          return mProvider.canGoBack();
      }
  
      /**
       * Goes back in the history of this WebView.
       */
      public void goBack() {
          checkThread();
          mProvider.goBack();
      }
  
      /**
       * Gets whether this WebView has a forward history item.
       *
       * @return {@code true} if this WebView has a forward history item
       */
      public boolean canGoForward() {
          checkThread();
          return mProvider.canGoForward();
      }
  
      /**
       * Goes forward in the history of this WebView.
       */
      public void goForward() {
          checkThread();
          mProvider.goForward();
      }
  
      /**
       * Gets whether the page can go back or forward the given
       * number of steps.
       *
       * @param steps the negative or positive number of steps to move the
       *              history
       */
      public boolean canGoBackOrForward(int steps) {
          checkThread();
          return mProvider.canGoBackOrForward(steps);
      }
  
      /**
       * Goes to the history item that is the number of steps away from
       * the current item. Steps is negative if backward and positive
       * if forward.
       *
       * @param steps the number of steps to take back or forward in the back
       *              forward list
       */
      public void goBackOrForward(int steps) {
          checkThread();
          mProvider.goBackOrForward(steps);
      }
  
      /**
       * Gets whether private browsing is enabled in this WebView.
       */
      public boolean isPrivateBrowsingEnabled() {
          checkThread();
          return mProvider.isPrivateBrowsingEnabled();
      }
  
      /**
       * Scrolls the contents of this WebView up by half the view size.
       *
       * @param top {@code true} to jump to the top of the page
       * @return {@code true} if the page was scrolled
       */
      public boolean pageUp(boolean top) {
          checkThread();
          return mProvider.pageUp(top);
      }
  
      /**
       * Scrolls the contents of this WebView down by half the page size.
       *
       * @param bottom {@code true} to jump to bottom of page
       * @return {@code true} if the page was scrolled
       */
      public boolean pageDown(boolean bottom) {
          checkThread();
          return mProvider.pageDown(bottom);
      }
  
      /**
       * Posts a {@link VisualStateCallback}, which will be called when
       * the current state of the WebView is ready to be drawn.
       *
       * <p>Because updates to the DOM are processed asynchronously, updates to the DOM may not
       * immediately be reflected visually by subsequent {@link WebView#onDraw} invocations. The
       * {@link VisualStateCallback} provides a mechanism to notify the caller when the contents of
       * the DOM at the current time are ready to be drawn the next time the {@link WebView}
       * draws.
       *
       * <p>The next draw after the callback completes is guaranteed to reflect all the updates to the
       * DOM up to the point at which the {@link VisualStateCallback} was posted, but it may also
       * contain updates applied after the callback was posted.
       *
       * <p>The state of the DOM covered by this API includes the following:
       * <ul>
       * <li>primitive HTML elements (div, img, span, etc..)</li>
       * <li>images</li>
       * <li>CSS animations</li>
       * <li>WebGL</li>
       * <li>canvas</li>
       * </ul>
       * It does not include the state of:
       * <ul>
       * <li>the video tag</li>
       * </ul>
       *
       * <p>To guarantee that the {@link WebView} will successfully render the first frame
       * after the {@link VisualStateCallback#onComplete} method has been called a set of conditions
       * must be met:
       * <ul>
       * <li>If the {@link WebView}'s visibility is set to {@link View#VISIBLE VISIBLE} then
       * the {@link WebView} must be attached to the view hierarchy.</li>
       * <li>If the {@link WebView}'s visibility is set to {@link View#INVISIBLE INVISIBLE}
       * then the {@link WebView} must be attached to the view hierarchy and must be made
       * {@link View#VISIBLE VISIBLE} from the {@link VisualStateCallback#onComplete} method.</li>
       * <li>If the {@link WebView}'s visibility is set to {@link View#GONE GONE} then the
       * {@link WebView} must be attached to the view hierarchy and its
       * {@link AbsoluteLayout.LayoutParams LayoutParams}'s width and height need to be set to fixed
       * values and must be made {@link View#VISIBLE VISIBLE} from the
       * {@link VisualStateCallback#onComplete} method.</li>
       * </ul>
       *
       * <p>When using this API it is also recommended to enable pre-rasterization if the {@link
       * WebView} is off screen to avoid flickering. See {@link WebSettings#setOffscreenPreRaster} for
       * more details and do consider its caveats.
       *
       * @param requestId An id that will be returned in the callback to allow callers to match
       *                  requests with callbacks.
       * @param callback  The callback to be invoked.
       */
      public void postVisualStateCallback(long requestId, VisualStateCallback callback) {
          checkThread();
          mProvider.insertVisualStateCallback(requestId, callback);
      }
  
      /**
       * Clears this WebView so that onDraw() will draw nothing but white background,
       * and onMeasure() will return 0 if MeasureSpec is not MeasureSpec.EXACTLY.
       * @deprecated Use WebView.loadUrl("about:blank") to reliably reset the view state
       *             and release page resources (including any running JavaScript).
       */
      @Deprecated
      public void clearView() {
          checkThread();
          mProvider.clearView();
      }
  
      /**
       * Gets a new picture that captures the current contents of this WebView.
       * The picture is of the entire document being displayed, and is not
       * limited to the area currently displayed by this WebView. Also, the
       * picture is a static copy and is unaffected by later changes to the
       * content being displayed.
       * <p>
       * Note that due to internal changes, for API levels between
       * {@link android.os.Build.VERSION_CODES#HONEYCOMB} and
       * {@link android.os.Build.VERSION_CODES#ICE_CREAM_SANDWICH} inclusive, the
       * picture does not include fixed position elements or scrollable divs.
       * <p>
       * Note that from {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1} the returned picture
       * should only be drawn into bitmap-backed Canvas - using any other type of Canvas will involve
       * additional conversion at a cost in memory and performance.
       *
       * @deprecated Use {@link #onDraw} to obtain a bitmap snapshot of the WebView, or
       * {@link #saveWebArchive} to save the content to a file.
       *
       * @return a picture that captures the current contents of this WebView
       */
      @Deprecated
      public Picture capturePicture() {
          checkThread();
          return mProvider.capturePicture();
      }
  
      /**
       * @deprecated Use {@link #createPrintDocumentAdapter(String)} which requires user
       *             to provide a print document name.
       */
      @Deprecated
      public PrintDocumentAdapter createPrintDocumentAdapter() {
          checkThread();
          return mProvider.createPrintDocumentAdapter("default");
      }
  
      /**
       * Creates a PrintDocumentAdapter that provides the content of this WebView for printing.
       *
       * The adapter works by converting the WebView contents to a PDF stream. The WebView cannot
       * be drawn during the conversion process - any such draws are undefined. It is recommended
       * to use a dedicated off screen WebView for the printing. If necessary, an application may
       * temporarily hide a visible WebView by using a custom PrintDocumentAdapter instance
       * wrapped around the object returned and observing the onStart and onFinish methods. See
       * {@link android.print.PrintDocumentAdapter} for more information.
       *
       * @param documentName  The user-facing name of the printed document. See
       *                      {@link android.print.PrintDocumentInfo}
       */
      public PrintDocumentAdapter createPrintDocumentAdapter(String documentName) {
          checkThread();
          return mProvider.createPrintDocumentAdapter(documentName);
      }
  
      /**
       * Gets the current scale of this WebView.
       *
       * @return the current scale
       *
       * @deprecated This method is prone to inaccuracy due to race conditions
       * between the web rendering and UI threads; prefer
       * {@link WebViewClient#onScaleChanged}.
       */
      @Deprecated
      @ViewDebug.ExportedProperty(category = "webview")
      public float getScale() {
          checkThread();
          return mProvider.getScale();
      }
  
      /**
       * Sets the initial scale for this WebView. 0 means default.
       * The behavior for the default scale depends on the state of
       * {@link WebSettings#getUseWideViewPort()} and
       * {@link WebSettings#getLoadWithOverviewMode()}.
       * If the content fits into the WebView control by width, then
       * the zoom is set to 100%. For wide content, the behavior
       * depends on the state of {@link WebSettings#getLoadWithOverviewMode()}.
       * If its value is {@code true}, the content will be zoomed out to be fit
       * by width into the WebView control, otherwise not.
       *
       * If initial scale is greater than 0, WebView starts with this value
       * as initial scale.
       * Please note that unlike the scale properties in the viewport meta tag,
       * this method doesn't take the screen density into account.
       *
       * @param scaleInPercent the initial scale in percent
       */
      public void setInitialScale(int scaleInPercent) {
          checkThread();
          mProvider.setInitialScale(scaleInPercent);
      }
  
      /**
       * Invokes the graphical zoom picker widget for this WebView. This will
       * result in the zoom widget appearing on the screen to control the zoom
       * level of this WebView.
       */
      public void invokeZoomPicker() {
          checkThread();
          mProvider.invokeZoomPicker();
      }
  
      /**
       * Gets a HitTestResult based on the current cursor node. If a HTML::a
       * tag is found and the anchor has a non-JavaScript URL, the HitTestResult
       * type is set to SRC_ANCHOR_TYPE and the URL is set in the "extra" field.
       * If the anchor does not have a URL or if it is a JavaScript URL, the type
       * will be UNKNOWN_TYPE and the URL has to be retrieved through
       * {@link #requestFocusNodeHref} asynchronously. If a HTML::img tag is
       * found, the HitTestResult type is set to IMAGE_TYPE and the URL is set in
       * the "extra" field. A type of
       * SRC_IMAGE_ANCHOR_TYPE indicates an anchor with a URL that has an image as
       * a child node. If a phone number is found, the HitTestResult type is set
       * to PHONE_TYPE and the phone number is set in the "extra" field of
       * HitTestResult. If a map address is found, the HitTestResult type is set
       * to GEO_TYPE and the address is set in the "extra" field of HitTestResult.
       * If an email address is found, the HitTestResult type is set to EMAIL_TYPE
       * and the email is set in the "extra" field of HitTestResult. Otherwise,
       * HitTestResult type is set to UNKNOWN_TYPE.
       */
      public HitTestResult getHitTestResult() {
          checkThread();
          return mProvider.getHitTestResult();
      }
  
      /**
       * Requests the anchor or image element URL at the last tapped point.
       * If hrefMsg is {@code null}, this method returns immediately and does not
       * dispatch hrefMsg to its target. If the tapped point hits an image,
       * an anchor, or an image in an anchor, the message associates
       * strings in named keys in its data. The value paired with the key
       * may be an empty string.
       *
       * @param hrefMsg the message to be dispatched with the result of the
       *                request. The message data contains three keys. "url"
       *                returns the anchor's href attribute. "title" returns the
       *                anchor's text. "src" returns the image's src attribute.
       */
      public void requestFocusNodeHref(@Nullable Message hrefMsg) {
          checkThread();
          mProvider.requestFocusNodeHref(hrefMsg);
      }
  
      /**
       * Requests the URL of the image last touched by the user. msg will be sent
       * to its target with a String representing the URL as its object.
       *
       * @param msg the message to be dispatched with the result of the request
       *            as the data member with "url" as key. The result can be {@code null}.
       */
      public void requestImageRef(Message msg) {
          checkThread();
          mProvider.requestImageRef(msg);
      }
  
      /**
       * Gets the URL for the current page. This is not always the same as the URL
       * passed to WebViewClient.onPageStarted because although the load for
       * that URL has begun, the current page may not have changed.
       *
       * @return the URL for the current page
       */
      @InspectableProperty(hasAttributeId = false)
      @ViewDebug.ExportedProperty(category = "webview")
      public String getUrl() {
          checkThread();
          return mProvider.getUrl();
      }
  
      /**
       * Gets the original URL for the current page. This is not always the same
       * as the URL passed to WebViewClient.onPageStarted because although the
       * load for that URL has begun, the current page may not have changed.
       * Also, there may have been redirects resulting in a different URL to that
       * originally requested.
       *
       * @return the URL that was originally requested for the current page
       */
      @InspectableProperty(hasAttributeId = false)
      @ViewDebug.ExportedProperty(category = "webview")
      public String getOriginalUrl() {
          checkThread();
          return mProvider.getOriginalUrl();
      }
  
      /**
       * Gets the title for the current page. This is the title of the current page
       * until WebViewClient.onReceivedTitle is called.
       *
       * @return the title for the current page
       */
      @InspectableProperty(hasAttributeId = false)
      @ViewDebug.ExportedProperty(category = "webview")
      public String getTitle() {
          checkThread();
          return mProvider.getTitle();
      }
  
      /**
       * Gets the favicon for the current page. This is the favicon of the current
       * page until WebViewClient.onReceivedIcon is called.
       *
       * @return the favicon for the current page
       */
      @InspectableProperty(hasAttributeId = false)
      public Bitmap getFavicon() {
          checkThread();
          return mProvider.getFavicon();
      }
  
      /**
       * Gets the touch icon URL for the apple-touch-icon <link> element, or
       * a URL on this site's server pointing to the standard location of a
       * touch icon.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public String getTouchIconUrl() {
          return mProvider.getTouchIconUrl();
      }
  
      /**
       * Gets the progress for the current page.
       *
       * @return the progress for the current page between 0 and 100
       */
      @InspectableProperty(hasAttributeId = false)
      public int getProgress() {
          checkThread();
          return mProvider.getProgress();
      }
  
      /**
       * Gets the height of the HTML content.
       *
       * @return the height of the HTML content
       */
      @InspectableProperty(hasAttributeId = false)
      @ViewDebug.ExportedProperty(category = "webview")
      public int getContentHeight() {
          checkThread();
          return mProvider.getContentHeight();
      }
  
      /**
       * Gets the width of the HTML content.
       *
       * @return the width of the HTML content
       * @hide
       */
      @ViewDebug.ExportedProperty(category = "webview")
      @UnsupportedAppUsage
      public int getContentWidth() {
          return mProvider.getContentWidth();
      }
  
      /**
       * Pauses all layout, parsing, and JavaScript timers for all WebViews. This
       * is a global requests, not restricted to just this WebView. This can be
       * useful if the application has been paused.
       */
      public void pauseTimers() {
          checkThread();
          mProvider.pauseTimers();
      }
  
      /**
       * Resumes all layout, parsing, and JavaScript timers for all WebViews.
       * This will resume dispatching all timers.
       */
      public void resumeTimers() {
          checkThread();
          mProvider.resumeTimers();
      }
  
      /**
       * Does a best-effort attempt to pause any processing that can be paused
       * safely, such as animations and geolocation. Note that this call
       * does not pause JavaScript. To pause JavaScript globally, use
       * {@link #pauseTimers}.
       *
       * To resume WebView, call {@link #onResume}.
       */
      public void onPause() {
          checkThread();
          mProvider.onPause();
      }
  
      /**
       * Resumes a WebView after a previous call to {@link #onPause}.
       */
      public void onResume() {
          checkThread();
          mProvider.onResume();
      }
  
      /**
       * Gets whether this WebView is paused, meaning onPause() was called.
       * Calling onResume() sets the paused state back to {@code false}.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public boolean isPaused() {
          return mProvider.isPaused();
      }
  
      /**
       * Informs this WebView that memory is low so that it can free any available
       * memory.
       * @deprecated Memory caches are automatically dropped when no longer needed, and in response
       *             to system memory pressure.
       */
      @Deprecated
      public void freeMemory() {
          checkThread();
          mProvider.freeMemory();
      }
  
      /**
       * Clears the resource cache. Note that the cache is per-application, so
       * this will clear the cache for all WebViews used.
       *
       * @param includeDiskFiles if {@code false}, only the RAM cache is cleared
       */
      public void clearCache(boolean includeDiskFiles) {
          checkThread();
          mProvider.clearCache(includeDiskFiles);
      }
  
      /**
       * Removes the autocomplete popup from the currently focused form field, if
       * present. Note this only affects the display of the autocomplete popup,
       * it does not remove any saved form data from this WebView's store. To do
       * that, use {@link WebViewDatabase#clearFormData}.
       */
      public void clearFormData() {
          checkThread();
          mProvider.clearFormData();
      }
  
      /**
       * Tells this WebView to clear its internal back/forward list.
       */
      public void clearHistory() {
          checkThread();
          mProvider.clearHistory();
      }
  
      /**
       * Clears the SSL preferences table stored in response to proceeding with
       * SSL certificate errors.
       */
      public void clearSslPreferences() {
          checkThread();
          mProvider.clearSslPreferences();
      }
  
      /**
       * Clears the client certificate preferences stored in response
       * to proceeding/cancelling client cert requests. Note that WebView
       * automatically clears these preferences when the system keychain is updated.
       * The preferences are shared by all the WebViews that are created by the embedder application.
       *
       * @param onCleared  A runnable to be invoked when client certs are cleared.
       *                   The runnable will be called in UI thread.
       */
      public static void clearClientCertPreferences(@Nullable Runnable onCleared) {
          getFactory().getStatics().clearClientCertPreferences(onCleared);
      }
  
      /**
       * Starts Safe Browsing initialization.
       * <p>
       * URL loads are not guaranteed to be protected by Safe Browsing until after {@code callback} is
       * invoked with {@code true}. Safe Browsing is not fully supported on all devices. For those
       * devices {@code callback} will receive {@code false}.
       * <p>
       * This should not be called if Safe Browsing has been disabled by manifest tag or {@link
       * WebSettings#setSafeBrowsingEnabled}. This prepares resources used for Safe Browsing.
       * <p>
       * This should be called with the Application Context (and will always use the Application
       * context to do its work regardless).
       *
       * @param context Application Context.
       * @param callback will be called on the UI thread with {@code true} if initialization is
       * successful, {@code false} otherwise.
       */
      public static void startSafeBrowsing(@NonNull Context context,
              @Nullable ValueCallback<Boolean> callback) {
          getFactory().getStatics().initSafeBrowsing(context, callback);
      }
  
      /**
       * Sets the list of hosts (domain names/IP addresses) that are exempt from SafeBrowsing checks.
       * The list is global for all the WebViews.
       * <p>
       * Each rule should take one of these:
       * <table>
       * <tr><th> Rule </th> <th> Example </th> <th> Matches Subdomain</th> </tr>
       * <tr><td> HOSTNAME </td> <td> example.com </td> <td> Yes </td> </tr>
       * <tr><td> .HOSTNAME </td> <td> .example.com </td> <td> No </td> </tr>
       * <tr><td> IPV4_LITERAL </td> <td> 192.168.1.1 </td> <td> No </td></tr>
       * <tr><td> IPV6_LITERAL_WITH_BRACKETS </td><td>[10:20:30:40:50:60:70:80]</td><td>No</td></tr>
       * </table>
       * <p>
       * All other rules, including wildcards, are invalid.
       * <p>
       * The correct syntax for hosts is defined by <a
       * href="https://tools.ietf.org/html/rfc3986#section-3.2.2">RFC 3986</a>.
       *
       * @param hosts the list of hosts
       * @param callback will be called with {@code true} if hosts are successfully added to the
       * whitelist. It will be called with {@code false} if any hosts are malformed. The callback
       * will be run on the UI thread
       */
      public static void setSafeBrowsingWhitelist(@NonNull List<String> hosts,
              @Nullable ValueCallback<Boolean> callback) {
          getFactory().getStatics().setSafeBrowsingWhitelist(hosts, callback);
      }
  
      /**
       * Returns a URL pointing to the privacy policy for Safe Browsing reporting.
       *
       * @return the url pointing to a privacy policy document which can be displayed to users.
       */
      @NonNull
      public static Uri getSafeBrowsingPrivacyPolicyUrl() {
          return getFactory().getStatics().getSafeBrowsingPrivacyPolicyUrl();
      }
  
      /**
       * Gets the WebBackForwardList for this WebView. This contains the
       * back/forward list for use in querying each item in the history stack.
       * This is a copy of the private WebBackForwardList so it contains only a
       * snapshot of the current state. Multiple calls to this method may return
       * different objects. The object returned from this method will not be
       * updated to reflect any new state.
       */
      public WebBackForwardList copyBackForwardList() {
          checkThread();
          return mProvider.copyBackForwardList();
  
      }
  
      /**
       * Registers the listener to be notified as find-on-page operations
       * progress. This will replace the current listener.
       *
       * @param listener an implementation of {@link FindListener}
       */
      public void setFindListener(FindListener listener) {
          checkThread();
          setupFindListenerIfNeeded();
          mFindListener.mUserFindListener = listener;
      }
  
      /**
       * Highlights and scrolls to the next match found by
       * {@link #findAllAsync}, wrapping around page boundaries as necessary.
       * Notifies any registered {@link FindListener}. If {@link #findAllAsync(String)}
       * has not been called yet, or if {@link #clearMatches} has been called since the
       * last find operation, this function does nothing.
       *
       * @param forward the direction to search
       * @see #setFindListener
       */
      public void findNext(boolean forward) {
          checkThread();
          mProvider.findNext(forward);
      }
  
      /**
       * Finds all instances of find on the page and highlights them.
       * Notifies any registered {@link FindListener}.
       *
       * @param find the string to find
       * @return the number of occurrences of the String "find" that were found
       * @deprecated {@link #findAllAsync} is preferred.
       * @see #setFindListener
       */
      @Deprecated
      public int findAll(String find) {
          checkThread();
          StrictMode.noteSlowCall("findAll blocks UI: prefer findAllAsync");
          return mProvider.findAll(find);
      }
  
      /**
       * Finds all instances of find on the page and highlights them,
       * asynchronously. Notifies any registered {@link FindListener}.
       * Successive calls to this will cancel any pending searches.
       *
       * @param find the string to find.
       * @see #setFindListener
       */
      public void findAllAsync(String find) {
          checkThread();
          mProvider.findAllAsync(find);
      }
  
      /**
       * Starts an ActionMode for finding text in this WebView.  Only works if this
       * WebView is attached to the view system.
       *
       * @param text if non-null, will be the initial text to search for.
       *             Otherwise, the last String searched for in this WebView will
       *             be used to start.
       * @param showIme if {@code true}, show the IME, assuming the user will begin typing.
       *                If {@code false} and text is non-null, perform a find all.
       * @return {@code true} if the find dialog is shown, {@code false} otherwise
       * @deprecated This method does not work reliably on all Android versions;
       *             implementing a custom find dialog using WebView.findAllAsync()
       *             provides a more robust solution.
       */
      @Deprecated
      public boolean showFindDialog(@Nullable String text, boolean showIme) {
          checkThread();
          return mProvider.showFindDialog(text, showIme);
      }
  
      /**
       * Gets the first substring which appears to be the address of a physical
       * location. Only addresses in the United States can be detected, which
       * must consist of:
       * <ul>
       *   <li>a house number</li>
       *   <li>a street name</li>
       *   <li>a street type (Road, Circle, etc), either spelled out or
       *       abbreviated</li>
       *   <li>a city name</li>
       *   <li>a state or territory, either spelled out or two-letter abbr</li>
       *   <li>an optional 5 digit or 9 digit zip code</li>
       * </ul>
       * All names must be correctly capitalized, and the zip code, if present,
       * must be valid for the state. The street type must be a standard USPS
       * spelling or abbreviation. The state or territory must also be spelled
       * or abbreviated using USPS standards. The house number may not exceed
       * five digits.
       *
       * <p class="note"><b>Note:</b> This function is deprecated and should be
       * avoided on all API levels, as it cannot detect addresses outside of the
       * United States and has a high rate of false positives. On API level
       * {@link android.os.Build.VERSION_CODES#O_MR1} and earlier, it also causes
       * the entire WebView implementation to be loaded and initialized, which
       * can throw {@link android.util.AndroidRuntimeException} or other exceptions
       * if the WebView implementation is currently being updated.
       *
       * @param addr the string to search for addresses
       * @return the address, or if no address is found, {@code null}
       * @deprecated This method is superseded by {@link TextClassifier#generateLinks(
       * android.view.textclassifier.TextLinks.Request)}. Avoid using this method even when targeting
       * API levels where no alternative is available.
       */
      @Nullable
      @Deprecated
      public static String findAddress(String addr) {
          if (addr == null) {
              throw new NullPointerException("addr is null");
          }
          return FindAddress.findAddress(addr);
      }
  
      /**
       * For apps targeting the L release, WebView has a new default behavior that reduces
       * memory footprint and increases performance by intelligently choosing
       * the portion of the HTML document that needs to be drawn. These
       * optimizations are transparent to the developers. However, under certain
       * circumstances, an App developer may want to disable them:
       * <ol>
       *   <li>When an app uses {@link #onDraw} to do own drawing and accesses portions
       *       of the page that is way outside the visible portion of the page.</li>
       *   <li>When an app uses {@link #capturePicture} to capture a very large HTML document.
       *       Note that capturePicture is a deprecated API.</li>
       * </ol>
       * Enabling drawing the entire HTML document has a significant performance
       * cost. This method should be called before any WebViews are created.
       */
      public static void enableSlowWholeDocumentDraw() {
          getFactory().getStatics().enableSlowWholeDocumentDraw();
      }
  
      /**
       * Clears the highlighting surrounding text matches created by
       * {@link #findAllAsync}.
       */
      public void clearMatches() {
          checkThread();
          mProvider.clearMatches();
      }
  
      /**
       * Queries the document to see if it contains any image references. The
       * message object will be dispatched with arg1 being set to 1 if images
       * were found and 0 if the document does not reference any images.
       *
       * @param response the message that will be dispatched with the result
       */
      public void documentHasImages(Message response) {
          checkThread();
          mProvider.documentHasImages(response);
      }
  
      /**
       * Sets the WebViewClient that will receive various notifications and
       * requests. This will replace the current handler.
       *
       * @param client an implementation of WebViewClient
       * @see #getWebViewClient
       */
      public void setWebViewClient(WebViewClient client) {
          checkThread();
          mProvider.setWebViewClient(client);
      }
  
      /**
       * Gets the WebViewClient.
       *
       * @return the WebViewClient, or a default client if not yet set
       * @see #setWebViewClient
       */
      public WebViewClient getWebViewClient() {
          checkThread();
          return mProvider.getWebViewClient();
      }
  
  
      /**
       * Gets a handle to the WebView renderer process associated with this WebView.
       *
       * <p>In {@link android.os.Build.VERSION_CODES#O} and above, WebView may
       * run in "multiprocess" mode. In multiprocess mode, rendering of web
       * content is performed by a sandboxed renderer process separate to the
       * application process.  This renderer process may be shared with other
       * WebViews in the application, but is not shared with other application
       * processes.
       *
       * <p>If WebView is running in multiprocess mode, this method returns a
       * handle to the renderer process associated with the WebView, which can
       * be used to control the renderer process.
       *
       * @return the {@link WebViewRenderProcess} renderer handle associated
       *         with this {@link WebView}, or {@code null} if
       *         WebView is not runing in multiprocess mode.
       */
      @Nullable
      public WebViewRenderProcess getWebViewRenderProcess() {
          checkThread();
          return mProvider.getWebViewRenderProcess();
      }
  
      /**
       * Sets the renderer client object associated with this WebView.
       *
       * <p>The renderer client encapsulates callbacks relevant to WebView renderer
       * state. See {@link WebViewRenderProcessClient} for details.
       *
       * <p>Although many WebView instances may share a single underlying
       * renderer, and renderers may live either in the application
       * process, or in a sandboxed process that is isolated from the
       * application process, instances of {@link WebViewRenderProcessClient}
       * are set per-WebView.  Callbacks represent renderer events from
       * the perspective of this WebView, and may or may not be correlated
       * with renderer events affecting other WebViews.
       *
       * @param executor the Executor on which {@link WebViewRenderProcessClient}
       *                 callbacks will execute.
       * @param webViewRenderProcessClient the {@link WebViewRenderProcessClient}
       *                                   object.
       */
      public void setWebViewRenderProcessClient(
              @NonNull @CallbackExecutor Executor executor,
              @NonNull WebViewRenderProcessClient webViewRenderProcessClient) {
          checkThread();
          mProvider.setWebViewRenderProcessClient(
                  executor, webViewRenderProcessClient);
      }
  
      /**
       * Sets the renderer client object associated with this WebView.
       *
       * See {@link #setWebViewRenderProcessClient(Executor,WebViewRenderProcessClient)} for details.
       *
       * <p> {@link WebViewRenderProcessClient} callbacks will run on the thread that this WebView was
       * initialized on.
       *
       * @param webViewRenderProcessClient the {@link WebViewRenderProcessClient} object.
       */
      public void setWebViewRenderProcessClient(
              @Nullable WebViewRenderProcessClient webViewRenderProcessClient) {
          checkThread();
          mProvider.setWebViewRenderProcessClient(null, webViewRenderProcessClient);
      }
  
      /**
       * Gets the renderer client object associated with this WebView.
       *
       * @return the {@link WebViewRenderProcessClient} object associated with this WebView, if one
       *         has been set via {@link #setWebViewRenderProcessClient(WebViewRenderProcessClient)}
       *         or {@code null} otherwise.
       */
      @Nullable
      public WebViewRenderProcessClient getWebViewRenderProcessClient() {
          checkThread();
          return mProvider.getWebViewRenderProcessClient();
      }
  
      /**
       * Registers the interface to be used when content can not be handled by
       * the rendering engine, and should be downloaded instead. This will replace
       * the current handler.
       *
       * @param listener an implementation of DownloadListener
       */
      public void setDownloadListener(DownloadListener listener) {
          checkThread();
          mProvider.setDownloadListener(listener);
      }
  
      /**
       * Sets the chrome handler. This is an implementation of WebChromeClient for
       * use in handling JavaScript dialogs, favicons, titles, and the progress.
       * This will replace the current handler.
       *
       * @param client an implementation of WebChromeClient
       * @see #getWebChromeClient
       */
      public void setWebChromeClient(WebChromeClient client) {
          checkThread();
          mProvider.setWebChromeClient(client);
      }
  
      /**
       * Gets the chrome handler.
       *
       * @return the WebChromeClient, or {@code null} if not yet set
       * @see #setWebChromeClient
       */
      @Nullable
      public WebChromeClient getWebChromeClient() {
          checkThread();
          return mProvider.getWebChromeClient();
      }
  
      /**
       * Sets the Picture listener. This is an interface used to receive
       * notifications of a new Picture.
       *
       * @param listener an implementation of WebView.PictureListener
       * @deprecated This method is now obsolete.
       */
      @Deprecated
      public void setPictureListener(PictureListener listener) {
          checkThread();
          mProvider.setPictureListener(listener);
      }
  
      /**
       * Injects the supplied Java object into this WebView. The object is
       * injected into all frames of the web page, including all the iframes,
       * using the supplied name. This allows the Java object's methods to be
       * accessed from JavaScript. For applications targeted to API
       * level {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
       * and above, only public methods that are annotated with
       * {@link android.webkit.JavascriptInterface} can be accessed from JavaScript.
       * For applications targeted to API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN} or below,
       * all public methods (including the inherited ones) can be accessed, see the
       * important security note below for implications.
       * <p> Note that injected objects will not appear in JavaScript until the page is next
       * (re)loaded. JavaScript should be enabled before injecting the object. For example:
       * <pre class="prettyprint">
       * class JsObject {
       *    {@literal @}JavascriptInterface
       *    public String toString() { return "injectedObject"; }
       * }
       * webview.getSettings().setJavaScriptEnabled(true);
       * webView.addJavascriptInterface(new JsObject(), "injectedObject");
       * webView.loadData("<!DOCTYPE html><title></title>", "text/html", null);
       * webView.loadUrl("javascript:alert(injectedObject.toString())");</pre>
       * <p>
       * <strong>IMPORTANT:</strong>
       * <ul>
       * <li> This method can be used to allow JavaScript to control the host
       * application. This is a powerful feature, but also presents a security
       * risk for apps targeting {@link android.os.Build.VERSION_CODES#JELLY_BEAN} or earlier.
       * Apps that target a version later than {@link android.os.Build.VERSION_CODES#JELLY_BEAN}
       * are still vulnerable if the app runs on a device running Android earlier than 4.2.
       * The most secure way to use this method is to target {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
       * and to ensure the method is called only when running on Android 4.2 or later.
       * With these older versions, JavaScript could use reflection to access an
       * injected object's public fields. Use of this method in a WebView
       * containing untrusted content could allow an attacker to manipulate the
       * host application in unintended ways, executing Java code with the
       * permissions of the host application. Use extreme care when using this
       * method in a WebView which could contain untrusted content.</li>
       * <li> JavaScript interacts with Java object on a private, background
       * thread of this WebView. Care is therefore required to maintain thread
       * safety.
       * </li>
       * <li> Because the object is exposed to all the frames, any frame could
       * obtain the object name and call methods on it. There is no way to tell the
       * calling frame's origin from the app side, so the app must not assume that
       * the caller is trustworthy unless the app can guarantee that no third party
       * content is ever loaded into the WebView even inside an iframe.</li>
       * <li> The Java object's fields are not accessible.</li>
       * <li> For applications targeted to API level {@link android.os.Build.VERSION_CODES#LOLLIPOP}
       * and above, methods of injected Java objects are enumerable from
       * JavaScript.</li>
       * </ul>
       *
       * @param object the Java object to inject into this WebView's JavaScript
       *               context. {@code null} values are ignored.
       * @param name the name used to expose the object in JavaScript
       */
      public void addJavascriptInterface(Object object, String name) {
          checkThread();
          mProvider.addJavascriptInterface(object, name);
      }
  
      /**
       * Removes a previously injected Java object from this WebView. Note that
       * the removal will not be reflected in JavaScript until the page is next
       * (re)loaded. See {@link #addJavascriptInterface}.
       *
       * @param name the name used to expose the object in JavaScript
       */
      public void removeJavascriptInterface(@NonNull String name) {
          checkThread();
          mProvider.removeJavascriptInterface(name);
      }
  
      /**
       * Creates a message channel to communicate with JS and returns the message
       * ports that represent the endpoints of this message channel. The HTML5 message
       * channel functionality is described
       * <a href="https://html.spec.whatwg.org/multipage/comms.html#messagechannel">here
       * </a>
       *
       * <p>The returned message channels are entangled and already in started state.
       *
       * @return the two message ports that form the message channel.
       */
      public WebMessagePort[] createWebMessageChannel() {
          checkThread();
          return mProvider.createWebMessageChannel();
      }
  
      /**
       * Post a message to main frame. The embedded application can restrict the
       * messages to a certain target origin. See
       * <a href="https://html.spec.whatwg.org/multipage/comms.html#posting-messages">
       * HTML5 spec</a> for how target origin can be used.
       * <p>
       * A target origin can be set as a wildcard ("*"). However this is not recommended.
       * See the page above for security issues.
       * <p>
       * Content loaded via {@link #loadData(String,String,String)} will not have a
       * valid origin, and thus cannot be sent messages securely. If you need to send
       * messages using this function, you should use
       * {@link #loadDataWithBaseURL(String,String,String,String,String)} with a valid
       * HTTP or HTTPS {@code baseUrl} to define a valid origin that can be used for
       * messaging.
       *
       * @param message the WebMessage
       * @param targetOrigin the target origin.
       */
      public void postWebMessage(WebMessage message, Uri targetOrigin) {
          checkThread();
          mProvider.postMessageToMainFrame(message, targetOrigin);
      }
  
      /**
       * Gets the WebSettings object used to control the settings for this
       * WebView.
       *
       * @return a WebSettings object that can be used to control this WebView's
       *         settings
       */
      public WebSettings getSettings() {
          checkThread();
          return mProvider.getSettings();
      }
  
      /**
       * Enables debugging of web contents (HTML / CSS / JavaScript)
       * loaded into any WebViews of this application. This flag can be enabled
       * in order to facilitate debugging of web layouts and JavaScript
       * code running inside WebViews. Please refer to WebView documentation
       * for the debugging guide.
       *
       * The default is {@code false}.
       *
       * @param enabled whether to enable web contents debugging
       */
      public static void setWebContentsDebuggingEnabled(boolean enabled) {
          getFactory().getStatics().setWebContentsDebuggingEnabled(enabled);
      }
  
      /**
       * Gets the list of currently loaded plugins.
       *
       * @return the list of currently loaded plugins
       * @deprecated This was used for Gears, which has been deprecated.
       * @hide
       */
      @Deprecated
      @UnsupportedAppUsage
      public static synchronized PluginList getPluginList() {
          return new PluginList();
      }
  
      /**
       * Define the directory used to store WebView data for the current process.
       * The provided suffix will be used when constructing data and cache
       * directory paths. If this API is not called, no suffix will be used.
       * Each directory can be used by only one process in the application. If more
       * than one process in an app wishes to use WebView, only one process can use
       * the default directory, and other processes must call this API to define
       * a unique suffix.
       * <p>
       * This means that different processes in the same application cannot directly
       * share WebView-related data, since the data directories must be distinct.
       * Applications that use this API may have to explicitly pass data between
       * processes. For example, login cookies may have to be copied from one
       * process's cookie jar to the other using {@link CookieManager} if both
       * processes' WebViews are intended to be logged in.
       * <p>
       * Most applications should simply ensure that all components of the app
       * that rely on WebView are in the same process, to avoid needing multiple
       * data directories. The {@link #disableWebView} method can be used to ensure
       * that the other processes do not use WebView by accident in this case.
       * <p>
       * This API must be called before any instances of WebView are created in
       * this process and before any other methods in the android.webkit package
       * are called by this process.
       *
       * @param suffix The directory name suffix to be used for the current
       *               process. Must not contain a path separator.
       * @throws IllegalStateException if WebView has already been initialized
       *                               in the current process.
       * @throws IllegalArgumentException if the suffix contains a path separator.
       */
      public static void setDataDirectorySuffix(String suffix) {
          WebViewFactory.setDataDirectorySuffix(suffix);
      }
  
      /**
       * Indicate that the current process does not intend to use WebView, and
       * that an exception should be thrown if a WebView is created or any other
       * methods in the android.webkit package are used.
       * <p>
       * Applications with multiple processes may wish to call this in processes
       * that are not intended to use WebView to avoid accidentally incurring
       * the memory usage of initializing WebView in long-lived processes that
       * have no need for it, and to prevent potential data directory conflicts
       * (see {@link #setDataDirectorySuffix}).
       * <p>
       * For example, an audio player application with one process for its
       * activities and another process for its playback service may wish to call
       * this method in the playback service's {@link android.app.Service#onCreate}.
       *
       * @throws IllegalStateException if WebView has already been initialized
       *                               in the current process.
       */
      public static void disableWebView() {
          WebViewFactory.disableWebView();
      }
  
  
      /**
       * @deprecated This was used for Gears, which has been deprecated.
       * @hide
       */
      @Deprecated
      @UnsupportedAppUsage
      public void refreshPlugins(boolean reloadOpenPages) {
          checkThread();
      }
  
      /**
       * Puts this WebView into text selection mode. Do not rely on this
       * functionality; it will be deprecated in the future.
       *
       * @deprecated This method is now obsolete.
       * @hide Since API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
       */
      @Deprecated
      @UnsupportedAppUsage
      public void emulateShiftHeld() {
          checkThread();
      }
  
      /**
       * @deprecated WebView no longer needs to implement
       * ViewGroup.OnHierarchyChangeListener.  This method does nothing now.
       */
      @Override
      // Cannot add @hide as this can always be accessed via the interface.
      @Deprecated
      public void onChildViewAdded(View parent, View child) {}
  
      /**
       * @deprecated WebView no longer needs to implement
       * ViewGroup.OnHierarchyChangeListener.  This method does nothing now.
       */
      @Override
      // Cannot add @hide as this can always be accessed via the interface.
      @Deprecated
      public void onChildViewRemoved(View p, View child) {}
  
      /**
       * @deprecated WebView should not have implemented
       * ViewTreeObserver.OnGlobalFocusChangeListener. This method does nothing now.
       */
      @Override
      // Cannot add @hide as this can always be accessed via the interface.
      @Deprecated
      public void onGlobalFocusChanged(View oldFocus, View newFocus) {
      }
  
      /**
       * @deprecated Only the default case, {@code true}, will be supported in a future version.
       */
      @Deprecated
      public void setMapTrackballToArrowKeys(boolean setMap) {
          checkThread();
          mProvider.setMapTrackballToArrowKeys(setMap);
      }
  
  
      public void flingScroll(int vx, int vy) {
          checkThread();
          mProvider.flingScroll(vx, vy);
      }
  
      /**
       * Gets the zoom controls for this WebView, as a separate View. The caller
       * is responsible for inserting this View into the layout hierarchy.
       * <p/>
       * API level {@link android.os.Build.VERSION_CODES#CUPCAKE} introduced
       * built-in zoom mechanisms for the WebView, as opposed to these separate
       * zoom controls. The built-in mechanisms are preferred and can be enabled
       * using {@link WebSettings#setBuiltInZoomControls}.
       *
       * @deprecated the built-in zoom mechanisms are preferred
       * @hide Since API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN}
       */
      @Deprecated
      @UnsupportedAppUsage
      public View getZoomControls() {
          checkThread();
          return mProvider.getZoomControls();
      }
  
      /**
       * Gets whether this WebView can be zoomed in.
       *
       * @return {@code true} if this WebView can be zoomed in
       *
       * @deprecated This method is prone to inaccuracy due to race conditions
       * between the web rendering and UI threads; prefer
       * {@link WebViewClient#onScaleChanged}.
       */
      @Deprecated
      public boolean canZoomIn() {
          checkThread();
          return mProvider.canZoomIn();
      }
  
      /**
       * Gets whether this WebView can be zoomed out.
       *
       * @return {@code true} if this WebView can be zoomed out
       *
       * @deprecated This method is prone to inaccuracy due to race conditions
       * between the web rendering and UI threads; prefer
       * {@link WebViewClient#onScaleChanged}.
       */
      @Deprecated
      public boolean canZoomOut() {
          checkThread();
          return mProvider.canZoomOut();
      }
  
      /**
       * Performs a zoom operation in this WebView.
       *
       * @param zoomFactor the zoom factor to apply. The zoom factor will be clamped to the WebView's
       * zoom limits. This value must be in the range 0.01 to 100.0 inclusive.
       */
      public void zoomBy(float zoomFactor) {
          checkThread();
          if (zoomFactor < 0.01)
              throw new IllegalArgumentException("zoomFactor must be greater than 0.01.");
          if (zoomFactor > 100.0)
              throw new IllegalArgumentException("zoomFactor must be less than 100.");
          mProvider.zoomBy(zoomFactor);
      }
  
      /**
       * Performs zoom in in this WebView.
       *
       * @return {@code true} if zoom in succeeds, {@code false} if no zoom changes
       */
      public boolean zoomIn() {
          checkThread();
          return mProvider.zoomIn();
      }
  
      /**
       * Performs zoom out in this WebView.
       *
       * @return {@code true} if zoom out succeeds, {@code false} if no zoom changes
       */
      public boolean zoomOut() {
          checkThread();
          return mProvider.zoomOut();
      }
  
      /**
       * @deprecated This method is now obsolete.
       * @hide Since API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
       */
      @Deprecated
      @UnsupportedAppUsage
      public void debugDump() {
          checkThread();
      }
  
      /**
       * See {@link ViewDebug.HierarchyHandler#dumpViewHierarchyWithProperties(BufferedWriter, int)}
       * @hide
       */
      @Override
      public void dumpViewHierarchyWithProperties(BufferedWriter out, int level) {
          mProvider.dumpViewHierarchyWithProperties(out, level);
      }
  
      /**
       * See {@link ViewDebug.HierarchyHandler#findHierarchyView(String, int)}
       * @hide
       */
      @Override
      public View findHierarchyView(String className, int hashCode) {
          return mProvider.findHierarchyView(className, hashCode);
      }
  
      /** @hide */
      @IntDef(prefix = { "RENDERER_PRIORITY_" }, value = {
              RENDERER_PRIORITY_WAIVED,
              RENDERER_PRIORITY_BOUND,
              RENDERER_PRIORITY_IMPORTANT
      })
      @Retention(RetentionPolicy.SOURCE)
      public @interface RendererPriority {}
  
      /**
       * The renderer associated with this WebView is bound with
       * {@link Context#BIND_WAIVE_PRIORITY}. At this priority level
       * {@link WebView} renderers will be strong targets for out of memory
       * killing.
       *
       * Use with {@link #setRendererPriorityPolicy}.
       */
      public static final int RENDERER_PRIORITY_WAIVED = 0;
      /**
       * The renderer associated with this WebView is bound with
       * the default priority for services.
       *
       * Use with {@link #setRendererPriorityPolicy}.
       */
      public static final int RENDERER_PRIORITY_BOUND = 1;
      /**
       * The renderer associated with this WebView is bound with
       * {@link Context#BIND_IMPORTANT}.
       *
       * Use with {@link #setRendererPriorityPolicy}.
       */
      public static final int RENDERER_PRIORITY_IMPORTANT = 2;
  
      /**
       * Set the renderer priority policy for this {@link WebView}. The
       * priority policy will be used to determine whether an out of
       * process renderer should be considered to be a target for OOM
       * killing.
       *
       * Because a renderer can be associated with more than one
       * WebView, the final priority it is computed as the maximum of
       * any attached WebViews. When a WebView is destroyed it will
       * cease to be considerered when calculating the renderer
       * priority. Once no WebViews remain associated with the renderer,
       * the priority of the renderer will be reduced to
       * {@link #RENDERER_PRIORITY_WAIVED}.
       *
       * The default policy is to set the priority to
       * {@link #RENDERER_PRIORITY_IMPORTANT} regardless of visibility,
       * and this should not be changed unless the caller also handles
       * renderer crashes with
       * {@link WebViewClient#onRenderProcessGone}. Any other setting
       * will result in WebView renderers being killed by the system
       * more aggressively than the application.
       *
       * @param rendererRequestedPriority the minimum priority at which
       *        this WebView desires the renderer process to be bound.
       * @param waivedWhenNotVisible if {@code true}, this flag specifies that
       *        when this WebView is not visible, it will be treated as
       *        if it had requested a priority of
       *        {@link #RENDERER_PRIORITY_WAIVED}.
       */
      public void setRendererPriorityPolicy(
              @RendererPriority int rendererRequestedPriority,
              boolean waivedWhenNotVisible) {
          mProvider.setRendererPriorityPolicy(rendererRequestedPriority, waivedWhenNotVisible);
      }
  
      /**
       * Get the requested renderer priority for this WebView.
       *
       * @return the requested renderer priority policy.
       */
      @InspectableProperty(hasAttributeId = false, enumMapping = {
              @InspectableProperty.EnumEntry(name = "waived", value = RENDERER_PRIORITY_WAIVED),
              @InspectableProperty.EnumEntry(name = "bound", value = RENDERER_PRIORITY_BOUND),
              @InspectableProperty.EnumEntry(name = "important", value = RENDERER_PRIORITY_IMPORTANT)
      })
      @RendererPriority
      public int getRendererRequestedPriority() {
          return mProvider.getRendererRequestedPriority();
      }
  
      /**
       * Return whether this WebView requests a priority of
       * {@link #RENDERER_PRIORITY_WAIVED} when not visible.
       *
       * @return whether this WebView requests a priority of
       * {@link #RENDERER_PRIORITY_WAIVED} when not visible.
       */
      @InspectableProperty(hasAttributeId = false)
      public boolean getRendererPriorityWaivedWhenNotVisible() {
          return mProvider.getRendererPriorityWaivedWhenNotVisible();
      }
  
      /**
       * Sets the {@link TextClassifier} for this WebView.
       */
      public void setTextClassifier(@Nullable TextClassifier textClassifier) {
          mProvider.setTextClassifier(textClassifier);
      }
  
      /**
       * Returns the {@link TextClassifier} used by this WebView.
       * If no TextClassifier has been set, this WebView uses the default set by the system.
       */
      @NonNull
      public TextClassifier getTextClassifier() {
          return mProvider.getTextClassifier();
      }
  
      /**
       * Returns the {@link ClassLoader} used to load internal WebView classes.
       * This method is meant for use by the WebView Support Library, there is no reason to use this
       * method otherwise.
       */
      @NonNull
      public static ClassLoader getWebViewClassLoader() {
          return getFactory().getWebViewClassLoader();
      }
  
      /**
       * Returns the {@link Looper} corresponding to the thread on which WebView calls must be made.
       */
      @NonNull
      public Looper getWebViewLooper() {
          return mWebViewThread;
      }
  
      //-------------------------------------------------------------------------
      // Interface for WebView providers
      //-------------------------------------------------------------------------
  
      /**
       * Gets the WebViewProvider. Used by providers to obtain the underlying
       * implementation, e.g. when the application responds to
       * WebViewClient.onCreateWindow() request.
       *
       * @hide WebViewProvider is not public API.
       */
      @SystemApi
      public WebViewProvider getWebViewProvider() {
          return mProvider;
      }
  
      /**
       * Callback interface, allows the provider implementation to access non-public methods
       * and fields, and make super-class calls in this WebView instance.
       * @hide Only for use by WebViewProvider implementations
       */
      @SystemApi
      public class PrivateAccess {
          // ---- Access to super-class methods ----
          public int super_getScrollBarStyle() {
              return WebView.super.getScrollBarStyle();
          }
  
          public void super_scrollTo(int scrollX, int scrollY) {
              WebView.super.scrollTo(scrollX, scrollY);
          }
  
          public void super_computeScroll() {
              WebView.super.computeScroll();
          }
  
          public boolean super_onHoverEvent(MotionEvent event) {
              return WebView.super.onHoverEvent(event);
          }
  
          public boolean super_performAccessibilityAction(int action, Bundle arguments) {
              return WebView.super.performAccessibilityActionInternal(action, arguments);
          }
  
          public boolean super_performLongClick() {
              return WebView.super.performLongClick();
          }
  
          public boolean super_setFrame(int left, int top, int right, int bottom) {
              return WebView.super.setFrame(left, top, right, bottom);
          }
  
          public boolean super_dispatchKeyEvent(KeyEvent event) {
              return WebView.super.dispatchKeyEvent(event);
          }
  
          public boolean super_onGenericMotionEvent(MotionEvent event) {
              return WebView.super.onGenericMotionEvent(event);
          }
  
          public boolean super_requestFocus(int direction, Rect previouslyFocusedRect) {
              return WebView.super.requestFocus(direction, previouslyFocusedRect);
          }
  
          public void super_setLayoutParams(ViewGroup.LayoutParams params) {
              WebView.super.setLayoutParams(params);
          }
  
          public void super_startActivityForResult(Intent intent, int requestCode) {
              WebView.super.startActivityForResult(intent, requestCode);
          }
  
          // ---- Access to non-public methods ----
          public void overScrollBy(int deltaX, int deltaY,
                  int scrollX, int scrollY,
                  int scrollRangeX, int scrollRangeY,
                  int maxOverScrollX, int maxOverScrollY,
                  boolean isTouchEvent) {
              WebView.this.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX, scrollRangeY,
                      maxOverScrollX, maxOverScrollY, isTouchEvent);
          }
  
          public void awakenScrollBars(int duration) {
              WebView.this.awakenScrollBars(duration);
          }
  
          public void awakenScrollBars(int duration, boolean invalidate) {
              WebView.this.awakenScrollBars(duration, invalidate);
          }
  
          public float getVerticalScrollFactor() {
              return WebView.this.getVerticalScrollFactor();
          }
  
          public float getHorizontalScrollFactor() {
              return WebView.this.getHorizontalScrollFactor();
          }
  
          public void setMeasuredDimension(int measuredWidth, int measuredHeight) {
              WebView.this.setMeasuredDimension(measuredWidth, measuredHeight);
          }
  
          public void onScrollChanged(int l, int t, int oldl, int oldt) {
              WebView.this.onScrollChanged(l, t, oldl, oldt);
          }
  
          public int getHorizontalScrollbarHeight() {
              return WebView.this.getHorizontalScrollbarHeight();
          }
  
          public void super_onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar,
                  int l, int t, int r, int b) {
              WebView.super.onDrawVerticalScrollBar(canvas, scrollBar, l, t, r, b);
          }
  
          // ---- Access to (non-public) fields ----
          /** Raw setter for the scroll X value, without invoking onScrollChanged handlers etc. */
          public void setScrollXRaw(int scrollX) {
              WebView.this.mScrollX = scrollX;
          }
  
          /** Raw setter for the scroll Y value, without invoking onScrollChanged handlers etc. */
          public void setScrollYRaw(int scrollY) {
              WebView.this.mScrollY = scrollY;
          }
  
      }
  
      //-------------------------------------------------------------------------
      // Package-private internal stuff
      //-------------------------------------------------------------------------
  
      // Only used by android.webkit.FindActionModeCallback.
      void setFindDialogFindListener(FindListener listener) {
          checkThread();
          setupFindListenerIfNeeded();
          mFindListener.mFindDialogFindListener = listener;
      }
  
      // Only used by android.webkit.FindActionModeCallback.
      @UnsupportedAppUsage
      void notifyFindDialogDismissed() {
          checkThread();
          mProvider.notifyFindDialogDismissed();
      }
  
      //-------------------------------------------------------------------------
      // Private internal stuff
      //-------------------------------------------------------------------------
  
      @UnsupportedAppUsage
      private WebViewProvider mProvider;
  
      /**
       * In addition to the FindListener that the user may set via the WebView.setFindListener
       * API, FindActionModeCallback will register it's own FindListener. We keep them separate
       * via this class so that the two FindListeners can potentially exist at once.
       */
      private class FindListenerDistributor implements FindListener {
          private FindListener mFindDialogFindListener;
          private FindListener mUserFindListener;
  
          @Override
          public void onFindResultReceived(int activeMatchOrdinal, int numberOfMatches,
                  boolean isDoneCounting) {
              if (mFindDialogFindListener != null) {
                  mFindDialogFindListener.onFindResultReceived(activeMatchOrdinal, numberOfMatches,
                          isDoneCounting);
              }
  
              if (mUserFindListener != null) {
                  mUserFindListener.onFindResultReceived(activeMatchOrdinal, numberOfMatches,
                          isDoneCounting);
              }
          }
      }
      private FindListenerDistributor mFindListener;
  
      private void setupFindListenerIfNeeded() {
          if (mFindListener == null) {
              mFindListener = new FindListenerDistributor();
              mProvider.setFindListener(mFindListener);
          }
      }
  
      private void ensureProviderCreated() {
          checkThread();
          if (mProvider == null) {
              // As this can get called during the base class constructor chain, pass the minimum
              // number of dependencies here; the rest are deferred to init().
              mProvider = getFactory().createWebView(this, new PrivateAccess());
          }
      }
  
      @UnsupportedAppUsage
      private static WebViewFactoryProvider getFactory() {
          return WebViewFactory.getProvider();
      }
  
      @UnsupportedAppUsage
      private final Looper mWebViewThread = Looper.myLooper();
  
      @UnsupportedAppUsage
      private void checkThread() {
          // Ignore mWebViewThread == null because this can be called during in the super class
          // constructor, before this class's own constructor has even started.
          if (mWebViewThread != null && Looper.myLooper() != mWebViewThread) {
              Throwable throwable = new Throwable(
                      "A WebView method was called on thread '" +
                      Thread.currentThread().getName() + "'. " +
                      "All WebView methods must be called on the same thread. " +
                      "(Expected Looper " + mWebViewThread + " called on " + Looper.myLooper() +
                      ", FYI main Looper is " + Looper.getMainLooper() + ")");
              Log.w(LOGTAG, Log.getStackTraceString(throwable));
              StrictMode.onWebViewMethodCalledOnWrongThread(throwable);
  
              if (sEnforceThreadChecking) {
                  throw new RuntimeException(throwable);
              }
          }
      }
  
      //-------------------------------------------------------------------------
      // Override View methods
      //-------------------------------------------------------------------------
  
      // TODO: Add a test that enumerates all methods in ViewDelegte & ScrollDelegate, and ensures
      // there's a corresponding override (or better, caller) for each of them in here.
  
      @Override
      protected void onAttachedToWindow() {
          super.onAttachedToWindow();
          mProvider.getViewDelegate().onAttachedToWindow();
      }
  
      /** @hide */
      @Override
      protected void onDetachedFromWindowInternal() {
          mProvider.getViewDelegate().onDetachedFromWindow();
          super.onDetachedFromWindowInternal();
      }
  
      /** @hide */
      @Override
      public void onMovedToDisplay(int displayId, Configuration config) {
          mProvider.getViewDelegate().onMovedToDisplay(displayId, config);
      }
  
      @Override
      public void setLayoutParams(ViewGroup.LayoutParams params) {
          mProvider.getViewDelegate().setLayoutParams(params);
      }
  
      @Override
      public void setOverScrollMode(int mode) {
          super.setOverScrollMode(mode);
          // This method may be called in the constructor chain, before the WebView provider is
          // created.
          ensureProviderCreated();
          mProvider.getViewDelegate().setOverScrollMode(mode);
      }
  
      @Override
      public void setScrollBarStyle(int style) {
          mProvider.getViewDelegate().setScrollBarStyle(style);
          super.setScrollBarStyle(style);
      }
  
      @Override
      protected int computeHorizontalScrollRange() {
          return mProvider.getScrollDelegate().computeHorizontalScrollRange();
      }
  
      @Override
      protected int computeHorizontalScrollOffset() {
          return mProvider.getScrollDelegate().computeHorizontalScrollOffset();
      }
  
      @Override
      protected int computeVerticalScrollRange() {
          return mProvider.getScrollDelegate().computeVerticalScrollRange();
      }
  
      @Override
      protected int computeVerticalScrollOffset() {
          return mProvider.getScrollDelegate().computeVerticalScrollOffset();
      }
  
      @Override
      protected int computeVerticalScrollExtent() {
          return mProvider.getScrollDelegate().computeVerticalScrollExtent();
      }
  
      @Override
      public void computeScroll() {
          mProvider.getScrollDelegate().computeScroll();
      }
  
      @Override
      public boolean onHoverEvent(MotionEvent event) {
          return mProvider.getViewDelegate().onHoverEvent(event);
      }
  
      @Override
      public boolean onTouchEvent(MotionEvent event) {
          return mProvider.getViewDelegate().onTouchEvent(event);
      }
  
      @Override
      public boolean onGenericMotionEvent(MotionEvent event) {
          return mProvider.getViewDelegate().onGenericMotionEvent(event);
      }
  
      @Override
      public boolean onTrackballEvent(MotionEvent event) {
          return mProvider.getViewDelegate().onTrackballEvent(event);
      }
  
      @Override
      public boolean onKeyDown(int keyCode, KeyEvent event) {
          return mProvider.getViewDelegate().onKeyDown(keyCode, event);
      }
  
      @Override
      public boolean onKeyUp(int keyCode, KeyEvent event) {
          return mProvider.getViewDelegate().onKeyUp(keyCode, event);
      }
  
      @Override
      public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {
          return mProvider.getViewDelegate().onKeyMultiple(keyCode, repeatCount, event);
      }
  
      /*
      TODO: These are not currently implemented in WebViewClassic, but it seems inconsistent not
      to be delegating them too.
  
      @Override
      public boolean onKeyPreIme(int keyCode, KeyEvent event) {
          return mProvider.getViewDelegate().onKeyPreIme(keyCode, event);
      }
      @Override
      public boolean onKeyLongPress(int keyCode, KeyEvent event) {
          return mProvider.getViewDelegate().onKeyLongPress(keyCode, event);
      }
      @Override
      public boolean onKeyShortcut(int keyCode, KeyEvent event) {
          return mProvider.getViewDelegate().onKeyShortcut(keyCode, event);
      }
      */
  
      @Override
      public AccessibilityNodeProvider getAccessibilityNodeProvider() {
          AccessibilityNodeProvider provider =
                  mProvider.getViewDelegate().getAccessibilityNodeProvider();
          return provider == null ? super.getAccessibilityNodeProvider() : provider;
      }
  
      @Deprecated
      @Override
      public boolean shouldDelayChildPressedState() {
          return mProvider.getViewDelegate().shouldDelayChildPressedState();
      }
  
      @Override
      public CharSequence getAccessibilityClassName() {
          return WebView.class.getName();
      }
  
      @Override
      public void onProvideVirtualStructure(ViewStructure structure) {
          mProvider.getViewDelegate().onProvideVirtualStructure(structure);
      }
  
      /**
       * {@inheritDoc}
       *
       * <p>The {@link ViewStructure} traditionally represents a {@link View}, while for web pages
       * it represent HTML nodes. Hence, it's necessary to "map" the HTML properties in a way that is
       * understood by the {@link android.service.autofill.AutofillService} implementations:
       *
       * <ol>
       *   <li>Only the HTML nodes inside a {@code FORM} are generated.
       *   <li>The source of the HTML is set using {@link ViewStructure#setWebDomain(String)} in the
       *   node representing the WebView.
       *   <li>If a web page has multiple {@code FORM}s, only the data for the current form is
       *   represented&mdash;if the user taps a field from another form, then the current autofill
       *   context is canceled (by calling {@link android.view.autofill.AutofillManager#cancel()} and
       *   a new context is created for that {@code FORM}.
       *   <li>Similarly, if the page has {@code IFRAME} nodes, they are not initially represented in
       *   the view structure until the user taps a field from a {@code FORM} inside the
       *   {@code IFRAME}, in which case it would be treated the same way as multiple forms described
       *   above, except that the {@link ViewStructure#setWebDomain(String) web domain} of the
       *   {@code FORM} contains the {@code src} attribute from the {@code IFRAME} node.
       *   <li>The W3C autofill field ({@code autocomplete} tag attribute) maps to
       *   {@link ViewStructure#setAutofillHints(String[])}.
       *   <li>If the view is editable, the {@link ViewStructure#setAutofillType(int)} and
       *   {@link ViewStructure#setAutofillValue(AutofillValue)} must be set.
       *   <li>The {@code placeholder} attribute maps to {@link ViewStructure#setHint(CharSequence)}.
       *   <li>Other HTML attributes can be represented through
       *   {@link ViewStructure#setHtmlInfo(android.view.ViewStructure.HtmlInfo)}.
       * </ol>
       *
       * <p>If the WebView implementation can determine that the value of a field was set statically
       * (for example, not through Javascript), it should also call
       * {@code structure.setDataIsSensitive(false)}.
       *
       * <p>For example, an HTML form with 2 fields for username and password:
       *
       * <pre class="prettyprint">
       *    &lt;label&gt;Username:&lt;/label&gt;
       *    &lt;input type="text" name="username" id="user" value="Type your username" autocomplete="username" placeholder="Email or username"&gt;
       *    &lt;label&gt;Password:&lt;/label&gt;
       *    &lt;input type="password" name="password" id="pass" autocomplete="current-password" placeholder="Password"&gt;
       * </pre>
       *
       * <p>Would map to:
       *
       * <pre class="prettyprint">
       *     int index = structure.addChildCount(2);
       *     ViewStructure username = structure.newChild(index);
       *     username.setAutofillId(structure.getAutofillId(), 1); // id 1 - first child
       *     username.setAutofillHints("username");
       *     username.setHtmlInfo(username.newHtmlInfoBuilder("input")
       *         .addAttribute("type", "text")
       *         .addAttribute("name", "username")
       *         .addAttribute("label", "Username:")
       *         .build());
       *     username.setHint("Email or username");
       *     username.setAutofillType(View.AUTOFILL_TYPE_TEXT);
       *     username.setAutofillValue(AutofillValue.forText("Type your username"));
       *     // Value of the field is not sensitive because it was created statically and not changed.
       *     username.setDataIsSensitive(false);
       *
       *     ViewStructure password = structure.newChild(index + 1);
       *     username.setAutofillId(structure, 2); // id 2 - second child
       *     password.setAutofillHints("current-password");
       *     password.setHtmlInfo(password.newHtmlInfoBuilder("input")
       *         .addAttribute("type", "password")
       *         .addAttribute("name", "password")
       *         .addAttribute("label", "Password:")
       *         .build());
       *     password.setHint("Password");
       *     password.setAutofillType(View.AUTOFILL_TYPE_TEXT);
       * </pre>
       */
      @Override
      public void onProvideAutofillVirtualStructure(ViewStructure structure, int flags) {
          mProvider.getViewDelegate().onProvideAutofillVirtualStructure(structure, flags);
      }
  
      /** @hide */
      @Override
      public void onProvideContentCaptureStructure(ViewStructure structure, int flags) {
          mProvider.getViewDelegate().onProvideContentCaptureStructure(structure, flags);
      }
  
      @Override
      public void autofill(SparseArray<AutofillValue>values) {
          mProvider.getViewDelegate().autofill(values);
      }
  
      @Override
      public boolean isVisibleToUserForAutofill(int virtualId) {
          return mProvider.getViewDelegate().isVisibleToUserForAutofill(virtualId);
      }
  
      /** @hide */
      @Override
      public void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) {
          super.onInitializeAccessibilityNodeInfoInternal(info);
          mProvider.getViewDelegate().onInitializeAccessibilityNodeInfo(info);
      }
  
      /** @hide */
      @Override
      public void onInitializeAccessibilityEventInternal(AccessibilityEvent event) {
          super.onInitializeAccessibilityEventInternal(event);
          mProvider.getViewDelegate().onInitializeAccessibilityEvent(event);
      }
  
      /** @hide */
      @Override
      public boolean performAccessibilityActionInternal(int action, Bundle arguments) {
          return mProvider.getViewDelegate().performAccessibilityAction(action, arguments);
      }
  
      /** @hide */
      @Override
      @UnsupportedAppUsage
      protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar,
              int l, int t, int r, int b) {
          mProvider.getViewDelegate().onDrawVerticalScrollBar(canvas, scrollBar, l, t, r, b);
      }
  
      @Override
      protected void onOverScrolled(int scrollX, int scrollY, boolean clampedX, boolean clampedY) {
          mProvider.getViewDelegate().onOverScrolled(scrollX, scrollY, clampedX, clampedY);
      }
  
      @Override
      protected void onWindowVisibilityChanged(int visibility) {
          super.onWindowVisibilityChanged(visibility);
          mProvider.getViewDelegate().onWindowVisibilityChanged(visibility);
      }
  
      @Override
      protected void onDraw(Canvas canvas) {
          mProvider.getViewDelegate().onDraw(canvas);
      }
  
      @Override
      public boolean performLongClick() {
          return mProvider.getViewDelegate().performLongClick();
      }
  
      @Override
      protected void onConfigurationChanged(Configuration newConfig) {
          mProvider.getViewDelegate().onConfigurationChanged(newConfig);
      }
  
      /**
       * Creates a new InputConnection for an InputMethod to interact with the WebView.
       * This is similar to {@link View#onCreateInputConnection} but note that WebView
       * calls InputConnection methods on a thread other than the UI thread.
       * If these methods are overridden, then the overriding methods should respect
       * thread restrictions when calling View methods or accessing data.
       */
      @Override
      public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
          return mProvider.getViewDelegate().onCreateInputConnection(outAttrs);
      }
  
      @Override
      public boolean onDragEvent(DragEvent event) {
          return mProvider.getViewDelegate().onDragEvent(event);
      }
  
      @Override
      protected void onVisibilityChanged(View changedView, int visibility) {
          super.onVisibilityChanged(changedView, visibility);
          // This method may be called in the constructor chain, before the WebView provider is
          // created.
          ensureProviderCreated();
          mProvider.getViewDelegate().onVisibilityChanged(changedView, visibility);
      }
  
      @Override
      public void onWindowFocusChanged(boolean hasWindowFocus) {
          mProvider.getViewDelegate().onWindowFocusChanged(hasWindowFocus);
          super.onWindowFocusChanged(hasWindowFocus);
      }
  
      @Override
      protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
          mProvider.getViewDelegate().onFocusChanged(focused, direction, previouslyFocusedRect);
          super.onFocusChanged(focused, direction, previouslyFocusedRect);
      }
  
      /** @hide */
      @Override
      @UnsupportedAppUsage
      protected boolean setFrame(int left, int top, int right, int bottom) {
          return mProvider.getViewDelegate().setFrame(left, top, right, bottom);
      }
  
      @Override
      protected void onSizeChanged(int w, int h, int ow, int oh) {
          super.onSizeChanged(w, h, ow, oh);
          mProvider.getViewDelegate().onSizeChanged(w, h, ow, oh);
      }
  
      @Override
      protected void onScrollChanged(int l, int t, int oldl, int oldt) {
          super.onScrollChanged(l, t, oldl, oldt);
          mProvider.getViewDelegate().onScrollChanged(l, t, oldl, oldt);
      }
  
      @Override
      public boolean dispatchKeyEvent(KeyEvent event) {
          return mProvider.getViewDelegate().dispatchKeyEvent(event);
      }
  
      @Override
      public boolean requestFocus(int direction, Rect previouslyFocusedRect) {
          return mProvider.getViewDelegate().requestFocus(direction, previouslyFocusedRect);
      }
  
      @Override
      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
          super.onMeasure(widthMeasureSpec, heightMeasureSpec);
          mProvider.getViewDelegate().onMeasure(widthMeasureSpec, heightMeasureSpec);
      }
  
      @Override
      public boolean requestChildRectangleOnScreen(View child, Rect rect, boolean immediate) {
          return mProvider.getViewDelegate().requestChildRectangleOnScreen(child, rect, immediate);
      }
  
      @Override
      public void setBackgroundColor(int color) {
          mProvider.getViewDelegate().setBackgroundColor(color);
      }
  
      @Override
      public void setLayerType(int layerType, Paint paint) {
          super.setLayerType(layerType, paint);
          mProvider.getViewDelegate().setLayerType(layerType, paint);
      }
  
      @Override
      protected void dispatchDraw(Canvas canvas) {
          mProvider.getViewDelegate().preDispatchDraw(canvas);
          super.dispatchDraw(canvas);
      }
  
      @Override
      public void onStartTemporaryDetach() {
          super.onStartTemporaryDetach();
          mProvider.getViewDelegate().onStartTemporaryDetach();
      }
  
      @Override
      public void onFinishTemporaryDetach() {
          super.onFinishTemporaryDetach();
          mProvider.getViewDelegate().onFinishTemporaryDetach();
      }
  
      @Override
      public Handler getHandler() {
          return mProvider.getViewDelegate().getHandler(super.getHandler());
      }
  
      @Override
      public View findFocus() {
          return mProvider.getViewDelegate().findFocus(super.findFocus());
      }
  
      /**
       * If WebView has already been loaded into the current process this method will return the
       * package that was used to load it. Otherwise, the package that would be used if the WebView
       * was loaded right now will be returned; this does not cause WebView to be loaded, so this
       * information may become outdated at any time.
       * The WebView package changes either when the current WebView package is updated, disabled, or
       * uninstalled. It can also be changed through a Developer Setting.
       * If the WebView package changes, any app process that has loaded WebView will be killed. The
       * next time the app starts and loads WebView it will use the new WebView package instead.
       * @return the current WebView package, or {@code null} if there is none.
       */
      @Nullable
      public static PackageInfo getCurrentWebViewPackage() {
          PackageInfo webviewPackage = WebViewFactory.getLoadedPackageInfo();
          if (webviewPackage != null) {
              return webviewPackage;
          }
  
          IWebViewUpdateService service = WebViewFactory.getUpdateService();
          if (service == null) {
              return null;
          }
          try {
              return service.getCurrentWebViewPackage();
          } catch (RemoteException e) {
              throw e.rethrowFromSystemServer();
          }
      }
  
      /**
       * 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
       */
      @Override
      public void onActivityResult(int requestCode, int resultCode, Intent data) {
          mProvider.getViewDelegate().onActivityResult(requestCode, resultCode, data);
      }
  
      @Override
      public boolean onCheckIsTextEditor() {
          return mProvider.getViewDelegate().onCheckIsTextEditor();
      }
  
      /** @hide */
      @Override
      protected void encodeProperties(@NonNull ViewHierarchyEncoder encoder) {
          super.encodeProperties(encoder);
  
          checkThread();
          encoder.addProperty("webview:contentHeight", mProvider.getContentHeight());
          encoder.addProperty("webview:contentWidth", mProvider.getContentWidth());
          encoder.addProperty("webview:scale", mProvider.getScale());
          encoder.addProperty("webview:title", mProvider.getTitle());
          encoder.addProperty("webview:url", mProvider.getUrl());
          encoder.addProperty("webview:originalUrl", mProvider.getOriginalUrl());
      }
  }
  