content: /*
   * Copyright (C) 2007 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.os;
  
  import android.Manifest;
  import android.annotation.NonNull;
  import android.annotation.RequiresPermission;
  import android.annotation.SuppressAutoDoc;
  import android.annotation.SystemApi;
  import android.annotation.TestApi;
  import android.annotation.UnsupportedAppUsage;
  import android.app.ActivityThread;
  import android.app.Application;
  import android.content.Context;
  import android.text.TextUtils;
  import android.util.Slog;
  import android.view.View;
  
  import com.android.internal.telephony.TelephonyProperties;
  
  import dalvik.system.VMRuntime;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Objects;
  
  /**
   * Information about the current build, extracted from system properties.
   */
  public class Build {
      private static final String TAG = "Build";
  
      /** Value used for when a build property is unknown. */
      public static final String UNKNOWN = "unknown";
  
      /** Either a changelist number, or a label like "M4-rc20". */
      public static final String ID = getString("ro.build.id");
  
      /** A build ID string meant for displaying to the user */
      public static final String DISPLAY = getString("ro.build.display.id");
  
      /** The name of the overall product. */
      public static final String PRODUCT = getString("ro.product.name");
  
      /** The name of the industrial design. */
      public static final String DEVICE = getString("ro.product.device");
  
      /** The name of the underlying board, like "goldfish". */
      public static final String BOARD = getString("ro.product.board");
  
      /**
       * The name of the instruction set (CPU type + ABI convention) of native code.
       *
       * @deprecated Use {@link #SUPPORTED_ABIS} instead.
       */
      @Deprecated
      public static final String CPU_ABI;
  
      /**
       * The name of the second instruction set (CPU type + ABI convention) of native code.
       *
       * @deprecated Use {@link #SUPPORTED_ABIS} instead.
       */
      @Deprecated
      public static final String CPU_ABI2;
  
      /** The manufacturer of the product/hardware. */
      public static final String MANUFACTURER = getString("ro.product.manufacturer");
  
      /** The consumer-visible brand with which the product/hardware will be associated, if any. */
      public static final String BRAND = getString("ro.product.brand");
  
      /** The end-user-visible name for the end product. */
      public static final String MODEL = getString("ro.product.model");
  
      /** The system bootloader version number. */
      public static final String BOOTLOADER = getString("ro.bootloader");
  
      /**
       * The radio firmware version number.
       *
       * @deprecated The radio firmware version is frequently not
       * available when this class is initialized, leading to a blank or
       * "unknown" value for this string.  Use
       * {@link #getRadioVersion} instead.
       */
      @Deprecated
      public static final String RADIO = getString(TelephonyProperties.PROPERTY_BASEBAND_VERSION);
  
      /** The name of the hardware (from the kernel command line or /proc). */
      public static final String HARDWARE = getString("ro.hardware");
  
      /**
       * Whether this build was for an emulator device.
       * @hide
       */
      @TestApi
      public static final boolean IS_EMULATOR = getString("ro.kernel.qemu").equals("1");
  
      /**
       * A hardware serial number, if available. Alphanumeric only, case-insensitive.
       * This field is always set to {@link Build#UNKNOWN}.
       *
       * @deprecated Use {@link #getSerial()} instead.
       **/
      @Deprecated
      // IMPORTANT: This field should be initialized via a function call to
      // prevent its value being inlined in the app during compilation because
      // we will later set it to the value based on the app's target SDK.
      public static final String SERIAL = getString("no.such.thing");
  
      /**
       * Gets the hardware serial number, if available.
       *
       * <p class="note"><b>Note:</b> Root access may allow you to modify device identifiers, such as
       * the hardware serial number. If you change these identifiers, you can use
       * <a href="/training/articles/security-key-attestation.html">key attestation</a> to obtain
       * proof of the device's original identifiers.
       *
       * <p>Requires Permission: READ_PRIVILEGED_PHONE_STATE, for the calling app to be the device or
       * profile owner and have the READ_PHONE_STATE permission, or that the calling app has carrier
       * privileges (see {@link android.telephony.TelephonyManager#hasCarrierPrivileges}). The profile
       * owner is an app that owns a managed profile on the device; for more details see <a
       * href="https://developer.android.com/work/managed-profiles">Work profiles</a>. Profile owner
       * access is deprecated and will be removed in a future release.
       *
       * <p>If the calling app does not meet one of these requirements then this method will behave
       * as follows:
       *
       * <ul>
       *     <li>If the calling app's target SDK is API level 28 or lower and the app has the
       *     READ_PHONE_STATE permission then {@link Build#UNKNOWN} is returned.</li>
       *     <li>If the calling app's target SDK is API level 28 or lower and the app does not have
       *     the READ_PHONE_STATE permission, or if the calling app is targeting API level 29 or
       *     higher, then a SecurityException is thrown.</li>
       * </ul>
       * *
       * @return The serial number if specified.
       */
      @SuppressAutoDoc // No support for device / profile owner.
      @RequiresPermission(Manifest.permission.READ_PRIVILEGED_PHONE_STATE)
      public static String getSerial() {
          IDeviceIdentifiersPolicyService service = IDeviceIdentifiersPolicyService.Stub
                  .asInterface(ServiceManager.getService(Context.DEVICE_IDENTIFIERS_SERVICE));
          try {
              Application application = ActivityThread.currentApplication();
              String callingPackage = application != null ? application.getPackageName() : null;
              return service.getSerialForPackage(callingPackage);
          } catch (RemoteException e) {
              e.rethrowFromSystemServer();
          }
          return UNKNOWN;
      }
  
      /**
       * An ordered list of ABIs supported by this device. The most preferred ABI is the first
       * element in the list.
       *
       * See {@link #SUPPORTED_32_BIT_ABIS} and {@link #SUPPORTED_64_BIT_ABIS}.
       */
      public static final String[] SUPPORTED_ABIS = getStringList("ro.product.cpu.abilist", ",");
  
      /**
       * An ordered list of <b>32 bit</b> ABIs supported by this device. The most preferred ABI
       * is the first element in the list.
       *
       * See {@link #SUPPORTED_ABIS} and {@link #SUPPORTED_64_BIT_ABIS}.
       */
      public static final String[] SUPPORTED_32_BIT_ABIS =
              getStringList("ro.product.cpu.abilist32", ",");
  
      /**
       * An ordered list of <b>64 bit</b> ABIs supported by this device. The most preferred ABI
       * is the first element in the list.
       *
       * See {@link #SUPPORTED_ABIS} and {@link #SUPPORTED_32_BIT_ABIS}.
       */
      public static final String[] SUPPORTED_64_BIT_ABIS =
              getStringList("ro.product.cpu.abilist64", ",");
  
      /** {@hide} */
      @TestApi
      public static boolean is64BitAbi(String abi) {
          return VMRuntime.is64BitAbi(abi);
      }
  
      static {
          /*
           * Adjusts CPU_ABI and CPU_ABI2 depending on whether or not a given process is 64 bit.
           * 32 bit processes will always see 32 bit ABIs in these fields for backward
           * compatibility.
           */
          final String[] abiList;
          if (VMRuntime.getRuntime().is64Bit()) {
              abiList = SUPPORTED_64_BIT_ABIS;
          } else {
              abiList = SUPPORTED_32_BIT_ABIS;
          }
  
          CPU_ABI = abiList[0];
          if (abiList.length > 1) {
              CPU_ABI2 = abiList[1];
          } else {
              CPU_ABI2 = "";
          }
      }
  
      /** Various version strings. */
      public static class VERSION {
          /**
           * The internal value used by the underlying source control to
           * represent this build.  E.g., a perforce changelist number
           * or a git hash.
           */
          public static final String INCREMENTAL = getString("ro.build.version.incremental");
  
          /**
           * The user-visible version string.  E.g., "1.0" or "3.4b5" or "bananas".
           *
           * This field is an opaque string. Do not assume that its value
           * has any particular structure or that values of RELEASE from
           * different releases can be somehow ordered.
           */
          public static final String RELEASE = getString("ro.build.version.release");
  
          /**
           * The base OS build the product is based on.
           */
          public static final String BASE_OS = SystemProperties.get("ro.build.version.base_os", "");
  
          /**
           * The user-visible security patch level. This value represents the date when the device
           * most recently applied a security patch.
           */
          public static final String SECURITY_PATCH = SystemProperties.get(
                  "ro.build.version.security_patch", "");
  
          /**
           * The user-visible SDK version of the framework in its raw String
           * representation; use {@link #SDK_INT} instead.
           *
           * @deprecated Use {@link #SDK_INT} to easily get this as an integer.
           */
          @Deprecated
          public static final String SDK = getString("ro.build.version.sdk");
  
          /**
           * The SDK version of the software currently running on this hardware
           * device. This value never changes while a device is booted, but it may
           * increase when the hardware manufacturer provides an OTA update.
           * <p>
           * Possible values are defined in {@link Build.VERSION_CODES}.
           */
          public static final int SDK_INT = SystemProperties.getInt(
                  "ro.build.version.sdk", 0);
  
          /**
           * The SDK version of the software that <em>initially</em> shipped on
           * this hardware device. It <em>never</em> changes during the lifetime
           * of the device, even when {@link #SDK_INT} increases due to an OTA
           * update.
           * <p>
           * Possible values are defined in {@link Build.VERSION_CODES}.
           *
           * @see #SDK_INT
           * @hide
           */
          @TestApi
          public static final int FIRST_SDK_INT = SystemProperties
                  .getInt("ro.product.first_api_level", 0);
  
          /**
           * The developer preview revision of a prerelease SDK. This value will always
           * be <code>0</code> on production platform builds/devices.
           *
           * <p>When this value is nonzero, any new API added since the last
           * officially published {@link #SDK_INT API level} is only guaranteed to be present
           * on that specific preview revision. For example, an API <code>Activity.fooBar()</code>
           * might be present in preview revision 1 but renamed or removed entirely in
           * preview revision 2, which may cause an app attempting to call it to crash
           * at runtime.</p>
           *
           * <p>Experimental apps targeting preview APIs should check this value for
           * equality (<code>==</code>) with the preview SDK revision they were built for
           * before using any prerelease platform APIs. Apps that detect a preview SDK revision
           * other than the specific one they expect should fall back to using APIs from
           * the previously published API level only to avoid unwanted runtime exceptions.
           * </p>
           */
          public static final int PREVIEW_SDK_INT = SystemProperties.getInt(
                  "ro.build.version.preview_sdk", 0);
  
          /**
           * The SDK fingerprint for a given prerelease SDK. This value will always be
           * {@code REL} on production platform builds/devices.
           *
           * <p>When this value is not {@code REL}, it contains a string fingerprint of the API
           * surface exposed by the preview SDK. Preview platforms with different API surfaces
           * will have different {@code PREVIEW_SDK_FINGERPRINT}.
           *
           * <p>This attribute is intended for use by installers for finer grained targeting of
           * packages. Applications targeting preview APIs should not use this field and should
           * instead use {@code PREVIEW_SDK_INT} or use reflection or other runtime checks to
           * detect the presence of an API or guard themselves against unexpected runtime
           * behavior.
           *
           * @hide
           */
          @SystemApi
          @NonNull public static final String PREVIEW_SDK_FINGERPRINT = SystemProperties.get(
                  "ro.build.version.preview_sdk_fingerprint", "REL");
  
          /**
           * The current development codename, or the string "REL" if this is
           * a release build.
           */
          public static final String CODENAME = getString("ro.build.version.codename");
  
          private static final String[] ALL_CODENAMES
                  = getStringList("ro.build.version.all_codenames", ",");
  
          /**
           * @hide
           */
          @UnsupportedAppUsage
          public static final String[] ACTIVE_CODENAMES = "REL".equals(ALL_CODENAMES[0])
                  ? new String[0] : ALL_CODENAMES;
  
          /**
           * The SDK version to use when accessing resources.
           * Use the current SDK version code.  For every active development codename
           * we are operating under, we bump the assumed resource platform version by 1.
           * @hide
           */
          @TestApi
          public static final int RESOURCES_SDK_INT = SDK_INT + ACTIVE_CODENAMES.length;
  
          /**
           * The current lowest supported value of app target SDK. Applications targeting
           * lower values may not function on devices running this SDK version. Its possible
           * values are defined in {@link Build.VERSION_CODES}.
           *
           * @hide
           */
          public static final int MIN_SUPPORTED_TARGET_SDK_INT = SystemProperties.getInt(
                  "ro.build.version.min_supported_target_sdk", 0);
      }
  
      /**
       * Enumeration of the currently known SDK version codes.  These are the
       * values that can be found in {@link VERSION#SDK}.  Version numbers
       * increment monotonically with each official platform release.
       */
      public static class VERSION_CODES {
          /**
           * Magic version number for a current development build, which has
           * not yet turned into an official release.
           */
          public static final int CUR_DEVELOPMENT = VMRuntime.SDK_VERSION_CUR_DEVELOPMENT;
  
          /**
           * October 2008: The original, first, version of Android.  Yay!
           */
          public static final int BASE = 1;
  
          /**
           * February 2009: First Android update, officially called 1.1.
           */
          public static final int BASE_1_1 = 2;
  
          /**
           * May 2009: Android 1.5.
           */
          public static final int CUPCAKE = 3;
  
          /**
           * September 2009: Android 1.6.
           *
           * <p>Applications targeting this or a later release will get these
           * new changes in behavior:</p>
           * <ul>
           * <li> They must explicitly request the
           * {@link android.Manifest.permission#WRITE_EXTERNAL_STORAGE} permission to be
           * able to modify the contents of the SD card.  (Apps targeting
           * earlier versions will always request the permission.)
           * <li> They must explicitly request the
           * {@link android.Manifest.permission#READ_PHONE_STATE} permission to be
           * able to be able to retrieve phone state info.  (Apps targeting
           * earlier versions will always request the permission.)
           * <li> They are assumed to support different screen densities and
           * sizes.  (Apps targeting earlier versions are assumed to only support
           * medium density normal size screens unless otherwise indicated).
           * They can still explicitly specify screen support either way with the
           * supports-screens manifest tag.
           * <li> {@link android.widget.TabHost} will use the new dark tab
           * background design.
           * </ul>
           */
          public static final int DONUT = 4;
  
          /**
           * November 2009: Android 2.0
           *
           * <p>Applications targeting this or a later release will get these
           * new changes in behavior:</p>
           * <ul>
           * <li> The {@link android.app.Service#onStartCommand
           * Service.onStartCommand} function will return the new
           * {@link android.app.Service#START_STICKY} behavior instead of the
           * old compatibility {@link android.app.Service#START_STICKY_COMPATIBILITY}.
           * <li> The {@link android.app.Activity} class will now execute back
           * key presses on the key up instead of key down, to be able to detect
           * canceled presses from virtual keys.
           * <li> The {@link android.widget.TabWidget} class will use a new color scheme
           * for tabs. In the new scheme, the foreground tab has a medium gray background
           * the background tabs have a dark gray background.
           * </ul>
           */
          public static final int ECLAIR = 5;
  
          /**
           * December 2009: Android 2.0.1
           */
          public static final int ECLAIR_0_1 = 6;
  
          /**
           * January 2010: Android 2.1
           */
          public static final int ECLAIR_MR1 = 7;
  
          /**
           * June 2010: Android 2.2
           */
          public static final int FROYO = 8;
  
          /**
           * November 2010: Android 2.3
           *
           * <p>Applications targeting this or a later release will get these
           * new changes in behavior:</p>
           * <ul>
           * <li> The application's notification icons will be shown on the new
           * dark status bar background, so must be visible in this situation.
           * </ul>
           */
          public static final int GINGERBREAD = 9;
  
          /**
           * February 2011: Android 2.3.3.
           */
          public static final int GINGERBREAD_MR1 = 10;
  
          /**
           * February 2011: Android 3.0.
           *
           * <p>Applications targeting this or a later release will get these
           * new changes in behavior:</p>
           * <ul>
           * <li> The default theme for applications is now dark holographic:
           *      {@link android.R.style#Theme_Holo}.
           * <li> On large screen devices that do not have a physical menu
           * button, the soft (compatibility) menu is disabled.
           * <li> The activity lifecycle has changed slightly as per
           * {@link android.app.Activity}.
           * <li> An application will crash if it does not call through
           * to the super implementation of its
           * {@link android.app.Activity#onPause Activity.onPause()} method.
           * <li> When an application requires a permission to access one of
           * its components (activity, receiver, service, provider), this
           * permission is no longer enforced when the application wants to
           * access its own component.  This means it can require a permission
           * on a component that it does not itself hold and still access that
           * component.
           * <li> {@link android.content.Context#getSharedPreferences
           * Context.getSharedPreferences()} will not automatically reload
           * the preferences if they have changed on storage, unless
           * {@link android.content.Context#MODE_MULTI_PROCESS} is used.
           * <li> {@link android.view.ViewGroup#setMotionEventSplittingEnabled}
           * will default to true.
           * <li> {@link android.view.WindowManager.LayoutParams#FLAG_SPLIT_TOUCH}
           * is enabled by default on windows.
           * <li> {@link android.widget.PopupWindow#isSplitTouchEnabled()
           * PopupWindow.isSplitTouchEnabled()} will return true by default.
           * <li> {@link android.widget.GridView} and {@link android.widget.ListView}
           * will use {@link android.view.View#setActivated View.setActivated}
           * for selected items if they do not implement {@link android.widget.Checkable}.
           * <li> {@link android.widget.Scroller} will be constructed with
           * "flywheel" behavior enabled by default.
           * </ul>
           */
          public static final int HONEYCOMB = 11;
  
          /**
           * May 2011: Android 3.1.
           */
          public static final int HONEYCOMB_MR1 = 12;
  
          /**
           * June 2011: Android 3.2.
           *
           * <p>Update to Honeycomb MR1 to support 7 inch tablets, improve
           * screen compatibility mode, etc.</p>
           *
           * <p>As of this version, applications that don't say whether they
           * support XLARGE screens will be assumed to do so only if they target
           * {@link #HONEYCOMB} or later; it had been {@link #GINGERBREAD} or
           * later.  Applications that don't support a screen size at least as
           * large as the current screen will provide the user with a UI to
           * switch them in to screen size compatibility mode.</p>
           *
           * <p>This version introduces new screen size resource qualifiers
           * based on the screen size in dp: see
           * {@link android.content.res.Configuration#screenWidthDp},
           * {@link android.content.res.Configuration#screenHeightDp}, and
           * {@link android.content.res.Configuration#smallestScreenWidthDp}.
           * Supplying these in &lt;supports-screens&gt; as per
           * {@link android.content.pm.ApplicationInfo#requiresSmallestWidthDp},
           * {@link android.content.pm.ApplicationInfo#compatibleWidthLimitDp}, and
           * {@link android.content.pm.ApplicationInfo#largestWidthLimitDp} is
           * preferred over the older screen size buckets and for older devices
           * the appropriate buckets will be inferred from them.</p>
           *
           * <p>Applications targeting this or a later release will get these
           * new changes in behavior:</p>
           * <ul>
           * <li><p>New {@link android.content.pm.PackageManager#FEATURE_SCREEN_PORTRAIT}
           * and {@link android.content.pm.PackageManager#FEATURE_SCREEN_LANDSCAPE}
           * features were introduced in this release.  Applications that target
           * previous platform versions are assumed to require both portrait and
           * landscape support in the device; when targeting Honeycomb MR1 or
           * greater the application is responsible for specifying any specific
           * orientation it requires.</p>
           * <li><p>{@link android.os.AsyncTask} will use the serial executor
           * by default when calling {@link android.os.AsyncTask#execute}.</p>
           * <li><p>{@link android.content.pm.ActivityInfo#configChanges
           * ActivityInfo.configChanges} will have the
           * {@link android.content.pm.ActivityInfo#CONFIG_SCREEN_SIZE} and
           * {@link android.content.pm.ActivityInfo#CONFIG_SMALLEST_SCREEN_SIZE}
           * bits set; these need to be cleared for older applications because
           * some developers have done absolute comparisons against this value
           * instead of correctly masking the bits they are interested in.
           * </ul>
           */
          public static final int HONEYCOMB_MR2 = 13;
  
          /**
           * October 2011: Android 4.0.
           *
           * <p>Applications targeting this or a later release will get these
           * new changes in behavior:</p>
           * <ul>
           * <li> For devices without a dedicated menu key, the software compatibility
           * menu key will not be shown even on phones.  By targeting Ice Cream Sandwich
           * or later, your UI must always have its own menu UI affordance if needed,
           * on both tablets and phones.  The ActionBar will take care of this for you.
           * <li> 2d drawing hardware acceleration is now turned on by default.
           * You can use
           * {@link android.R.attr#hardwareAccelerated android:hardwareAccelerated}
           * to turn it off if needed, although this is strongly discouraged since
           * it will result in poor performance on larger screen devices.
           * <li> The default theme for applications is now the "device default" theme:
           *      {@link android.R.style#Theme_DeviceDefault}. This may be the
           *      holo dark theme or a different dark theme defined by the specific device.
           *      The {@link android.R.style#Theme_Holo} family must not be modified
           *      for a device to be considered compatible. Applications that explicitly
           *      request a theme from the Holo family will be guaranteed that these themes
           *      will not change character within the same platform version. Applications
           *      that wish to blend in with the device should use a theme from the
           *      {@link android.R.style#Theme_DeviceDefault} family.
           * <li> Managed cursors can now throw an exception if you directly close
           * the cursor yourself without stopping the management of it; previously failures
           * would be silently ignored.
           * <li> The fadingEdge attribute on views will be ignored (fading edges is no
           * longer a standard part of the UI).  A new requiresFadingEdge attribute allows
           * applications to still force fading edges on for special cases.
           * <li> {@link android.content.Context#bindService Context.bindService()}
           * will not automatically add in {@link android.content.Context#BIND_WAIVE_PRIORITY}.
           * <li> App Widgets will have standard padding automatically added around
           * them, rather than relying on the padding being baked into the widget itself.
           * <li> An exception will be thrown if you try to change the type of a
           * window after it has been added to the window manager.  Previously this
           * would result in random incorrect behavior.
           * <li> {@link android.view.animation.AnimationSet} will parse out
           * the duration, fillBefore, fillAfter, repeatMode, and startOffset
           * XML attributes that are defined.
           * <li> {@link android.app.ActionBar#setHomeButtonEnabled
           * ActionBar.setHomeButtonEnabled()} is false by default.
           * </ul>
           */
          public static final int ICE_CREAM_SANDWICH = 14;
  
          /**
           * December 2011: Android 4.0.3.
           */
          public static final int ICE_CREAM_SANDWICH_MR1 = 15;
  
          /**
           * June 2012: Android 4.1.
           *
           * <p>Applications targeting this or a later release will get these
           * new changes in behavior:</p>
           * <ul>
           * <li> You must explicitly request the {@link android.Manifest.permission#READ_CALL_LOG}
           * and/or {@link android.Manifest.permission#WRITE_CALL_LOG} permissions;
           * access to the call log is no longer implicitly provided through
           * {@link android.Manifest.permission#READ_CONTACTS} and
           * {@link android.Manifest.permission#WRITE_CONTACTS}.
           * <li> {@link android.widget.RemoteViews} will throw an exception if
           * setting an onClick handler for views being generated by a
           * {@link android.widget.RemoteViewsService} for a collection container;
           * previously this just resulted in a warning log message.
           * <li> New {@link android.app.ActionBar} policy for embedded tabs:
           * embedded tabs are now always stacked in the action bar when in portrait
           * mode, regardless of the size of the screen.
           * <li> {@link android.webkit.WebSettings#setAllowFileAccessFromFileURLs(boolean)
           * WebSettings.setAllowFileAccessFromFileURLs} and
           * {@link android.webkit.WebSettings#setAllowUniversalAccessFromFileURLs(boolean)
           * WebSettings.setAllowUniversalAccessFromFileURLs} default to false.
           * <li> Calls to {@link android.content.pm.PackageManager#setComponentEnabledSetting
           * PackageManager.setComponentEnabledSetting} will now throw an
           * IllegalArgumentException if the given component class name does not
           * exist in the application's manifest.
           * <li> {@link android.nfc.NfcAdapter#setNdefPushMessage
           * NfcAdapter.setNdefPushMessage},
           * {@link android.nfc.NfcAdapter#setNdefPushMessageCallback
           * NfcAdapter.setNdefPushMessageCallback} and
           * {@link android.nfc.NfcAdapter#setOnNdefPushCompleteCallback
           * NfcAdapter.setOnNdefPushCompleteCallback} will throw
           * IllegalStateException if called after the Activity has been destroyed.
           * <li> Accessibility services must require the new
           * {@link android.Manifest.permission#BIND_ACCESSIBILITY_SERVICE} permission or
           * they will not be available for use.
           * <li> {@link android.accessibilityservice.AccessibilityServiceInfo#FLAG_INCLUDE_NOT_IMPORTANT_VIEWS
           * AccessibilityServiceInfo.FLAG_INCLUDE_NOT_IMPORTANT_VIEWS} must be set
           * for unimportant views to be included in queries.
           * </ul>
           */
          public static final int JELLY_BEAN = 16;
  
          /**
           * November 2012: Android 4.2, Moar jelly beans!
           *
           * <p>Applications targeting this or a later release will get these
           * new changes in behavior:</p>
           * <ul>
           * <li>Content Providers: The default value of {@code android:exported} is now
           * {@code false}. See
           * <a href="{@docRoot}guide/topics/manifest/provider-element.html#exported">
           * the android:exported section</a> in the provider documentation for more details.</li>
           * <li>{@link android.view.View#getLayoutDirection() View.getLayoutDirection()}
           * can return different values than {@link android.view.View#LAYOUT_DIRECTION_LTR}
           * based on the locale etc.
           * <li> {@link android.webkit.WebView#addJavascriptInterface(Object, String)
           * WebView.addJavascriptInterface} requires explicit annotations on methods
           * for them to be accessible from Javascript.
           * </ul>
           */
          public static final int JELLY_BEAN_MR1 = 17;
  
          /**
           * July 2013: Android 4.3, the revenge of the beans.
           */
          public static final int JELLY_BEAN_MR2 = 18;
  
          /**
           * October 2013: Android 4.4, KitKat, another tasty treat.
           *
           * <p>Applications targeting this or a later release will get these
           * new changes in behavior. For more information about this release, see the
           * <a href="/about/versions/kitkat/">Android KitKat overview</a>.</p>
           * <ul>
           * <li> The default result of
           * {@link android.preference.PreferenceActivity#isValidFragment(String)
           * PreferenceActivity.isValueFragment} becomes false instead of true.</li>
           * <li> In {@link android.webkit.WebView}, apps targeting earlier versions will have
           * JS URLs evaluated directly and any result of the evaluation will not replace
           * the current page content.  Apps targetting KITKAT or later that load a JS URL will
           * have the result of that URL replace the content of the current page</li>
           * <li> {@link android.app.AlarmManager#set AlarmManager.set} becomes interpreted as
           * an inexact value, to give the system more flexibility in scheduling alarms.</li>
           * <li> {@link android.content.Context#getSharedPreferences(String, int)
           * Context.getSharedPreferences} no longer allows a null name.</li>
           * <li> {@link android.widget.RelativeLayout} changes to compute wrapped content
           * margins correctly.</li>
           * <li> {@link android.app.ActionBar}'s window content overlay is allowed to be
           * drawn.</li>
           * <li>The {@link android.Manifest.permission#READ_EXTERNAL_STORAGE}
           * permission is now always enforced.</li>
           * <li>Access to package-specific external storage directories belonging
           * to the calling app no longer requires the
           * {@link android.Manifest.permission#READ_EXTERNAL_STORAGE} or
           * {@link android.Manifest.permission#WRITE_EXTERNAL_STORAGE}
           * permissions.</li>
           * </ul>
           */
          public static final int KITKAT = 19;
  
          /**
           * June 2014: Android 4.4W. KitKat for watches, snacks on the run.
           *
           * <p>Applications targeting this or a later release will get these
           * new changes in behavior:</p>
           * <ul>
           * <li>{@link android.app.AlertDialog} might not have a default background if the theme does
           * not specify one.</li>
           * </ul>
           */
          public static final int KITKAT_WATCH = 20;
  
          /**
           * Temporary until we completely switch to {@link #LOLLIPOP}.
           * @hide
           */
          public static final int L = 21;
  
          /**
           * November 2014: Lollipop.  A flat one with beautiful shadows.  But still tasty.
           *
           * <p>Applications targeting this or a later release will get these
           * new changes in behavior.  For more information about this release, see the
           * <a href="/about/versions/lollipop/">Android Lollipop overview</a>.</p>
           * <ul>
           * <li> {@link android.content.Context#bindService Context.bindService} now
           * requires an explicit Intent, and will throw an exception if given an implicit
           * Intent.</li>
           * <li> {@link android.app.Notification.Builder Notification.Builder} will
           * not have the colors of their various notification elements adjusted to better
           * match the new material design look.</li>
           * <li> {@link android.os.Message} will validate that a message is not currently
           * in use when it is recycled.</li>
           * <li> Hardware accelerated drawing in windows will be enabled automatically
           * in most places.</li>
           * <li> {@link android.widget.Spinner} throws an exception if attaching an
           * adapter with more than one item type.</li>
           * <li> If the app is a launcher, the launcher will be available to the user
           * even when they are using corporate profiles (which requires that the app
           * use {@link android.content.pm.LauncherApps} to correctly populate its
           * apps UI).</li>
           * <li> Calling {@link android.app.Service#stopForeground Service.stopForeground}
           * with removeNotification false will modify the still posted notification so that
           * it is no longer forced to be ongoing.</li>
           * <li> A {@link android.service.dreams.DreamService} must require the
           * {@link android.Manifest.permission#BIND_DREAM_SERVICE} permission to be usable.</li>
           * </ul>
           */
          public static final int LOLLIPOP = 21;
  
          /**
           * March 2015: Lollipop with an extra sugar coating on the outside!
           * For more information about this release, see the
           * <a href="/about/versions/android-5.1">Android 5.1 APIs</a>.
           */
          public static final int LOLLIPOP_MR1 = 22;
  
          /**
           * M is for Marshmallow!
           *
           * <p>Applications targeting this or a later release will get these
           * new changes in behavior. For more information about this release, see the
           * <a href="/about/versions/marshmallow/">Android 6.0 Marshmallow overview</a>.</p>
           * <ul>
           * <li> Runtime permissions.  Dangerous permissions are no longer granted at
           * install time, but must be requested by the application at runtime through
           * {@link android.app.Activity#requestPermissions}.</li>
           * <li> Bluetooth and Wi-Fi scanning now requires holding the location permission.</li>
           * <li> {@link android.app.AlarmManager#setTimeZone AlarmManager.setTimeZone} will fail if
           * the given timezone is non-Olson.</li>
           * <li> Activity transitions will only return shared
           * elements mapped in the returned view hierarchy back to the calling activity.</li>
           * <li> {@link android.view.View} allows a number of behaviors that may break
           * existing apps: Canvas throws an exception if restore() is called too many times,
           * widgets may return a hint size when returning UNSPECIFIED measure specs, and it
           * will respect the attributes {@link android.R.attr#foreground},
           * {@link android.R.attr#foregroundGravity}, {@link android.R.attr#foregroundTint}, and
           * {@link android.R.attr#foregroundTintMode}.</li>
           * <li> {@link android.view.MotionEvent#getButtonState MotionEvent.getButtonState}
           * will no longer report {@link android.view.MotionEvent#BUTTON_PRIMARY}
           * and {@link android.view.MotionEvent#BUTTON_SECONDARY} as synonyms for
           * {@link android.view.MotionEvent#BUTTON_STYLUS_PRIMARY} and
           * {@link android.view.MotionEvent#BUTTON_STYLUS_SECONDARY}.</li>
           * <li> {@link android.widget.ScrollView} now respects the layout param margins
           * when measuring.</li>
           * </ul>
           */
          public static final int M = 23;
  
          /**
           * N is for Nougat.
           *
           * <p>Applications targeting this or a later release will get these
           * new changes in behavior. For more information about this release, see
           * the <a href="/about/versions/nougat/">Android Nougat overview</a>.</p>
           * <ul>
           * <li> {@link android.app.DownloadManager.Request#setAllowedNetworkTypes
           * DownloadManager.Request.setAllowedNetworkTypes}
           * will disable "allow over metered" when specifying only
           * {@link android.app.DownloadManager.Request#NETWORK_WIFI}.</li>
           * <li> {@link android.app.DownloadManager} no longer allows access to raw
           * file paths.</li>
           * <li> {@link android.app.Notification.Builder#setShowWhen
           * Notification.Builder.setShowWhen}
           * must be called explicitly to have the time shown, and various other changes in
           * {@link android.app.Notification.Builder Notification.Builder} to how notifications
           * are shown.</li>
           * <li>{@link android.content.Context#MODE_WORLD_READABLE} and
           * {@link android.content.Context#MODE_WORLD_WRITEABLE} are no longer supported.</li>
           * <li>{@link android.os.FileUriExposedException} will be thrown to applications.</li>
           * <li>Applications will see global drag and drops as per
           * {@link android.view.View#DRAG_FLAG_GLOBAL}.</li>
           * <li>{@link android.webkit.WebView#evaluateJavascript WebView.evaluateJavascript}
           * will not persist state from an empty WebView.</li>
           * <li>{@link android.animation.AnimatorSet} will not ignore calls to end() before
           * start().</li>
           * <li>{@link android.app.AlarmManager#cancel(android.app.PendingIntent)
           * AlarmManager.cancel} will throw a NullPointerException if given a null operation.</li>
           * <li>{@link android.app.FragmentManager} will ensure fragments have been created
           * before being placed on the back stack.</li>
           * <li>{@link android.app.FragmentManager} restores fragments in
           * {@link android.app.Fragment#onCreate Fragment.onCreate} rather than after the
           * method returns.</li>
           * <li>{@link android.R.attr#resizeableActivity} defaults to true.</li>
           * <li>{@link android.graphics.drawable.AnimatedVectorDrawable} throws exceptions when
           * opening invalid VectorDrawable animations.</li>
           * <li>{@link android.view.ViewGroup.MarginLayoutParams} will no longer be dropped
           * when converting between some types of layout params (such as
           * {@link android.widget.LinearLayout.LayoutParams LinearLayout.LayoutParams} to
           * {@link android.widget.RelativeLayout.LayoutParams RelativeLayout.LayoutParams}).</li>
           * <li>Your application processes will not be killed when the device density changes.</li>
           * <li>Drag and drop. After a view receives the
           * {@link android.view.DragEvent#ACTION_DRAG_ENTERED} event, when the drag shadow moves into
           * a descendant view that can accept the data, the view receives the
           * {@link android.view.DragEvent#ACTION_DRAG_EXITED} event and won’t receive
           * {@link android.view.DragEvent#ACTION_DRAG_LOCATION} and
           * {@link android.view.DragEvent#ACTION_DROP} events while the drag shadow is within that
           * descendant view, even if the descendant view returns <code>false</code> from its handler
           * for these events.</li>
           * </ul>
           */
          public static final int N = 24;
  
          /**
           * N MR1: Nougat++. For more information about this release, see
           * <a href="/about/versions/nougat/android-7.1">Android 7.1 for
           * Developers</a>.
           */
          public static final int N_MR1 = 25;
  
          /**
           * O.
           *
           * <p>Applications targeting this or a later release will get these
           * new changes in behavior. For more information about this release, see
           * the <a href="/about/versions/oreo/">Android Oreo overview</a>.</p>
           * <ul>
           * <li><a href="{@docRoot}about/versions/oreo/background.html">Background execution limits</a>
           * are applied to the application.</li>
           * <li>The behavior of AccountManager's
           * {@link android.accounts.AccountManager#getAccountsByType},
           * {@link android.accounts.AccountManager#getAccountsByTypeAndFeatures}, and
           * {@link android.accounts.AccountManager#hasFeatures} has changed as documented there.</li>
           * <li>{@link android.app.ActivityManager.RunningAppProcessInfo#IMPORTANCE_PERCEPTIBLE_PRE_26}
           * is now returned as
           * {@link android.app.ActivityManager.RunningAppProcessInfo#IMPORTANCE_PERCEPTIBLE}.</li>
           * <li>The {@link android.app.NotificationManager} now requires the use of notification
           * channels.</li>
           * <li>Changes to the strict mode that are set in
           * {@link Application#onCreate Application.onCreate} will no longer be clobbered after
           * that function returns.</li>
           * <li>A shared library apk with native code will have that native code included in
           * the library path of its clients.</li>
           * <li>{@link android.content.Context#getSharedPreferences Context.getSharedPreferences}
           * in credential encrypted storage will throw an exception before the user is unlocked.</li>
           * <li>Attempting to retrieve a {@link Context#FINGERPRINT_SERVICE} on a device that
           * does not support that feature will now throw a runtime exception.</li>
           * <li>{@link android.app.Fragment} will stop any active view animations when
           * the fragment is stopped.</li>
           * <li>Some compatibility code in Resources that attempts to use the default Theme
           * the app may be using will be turned off, requiring the app to explicitly request
           * resources with the right theme.</li>
           * <li>{@link android.content.ContentResolver#notifyChange ContentResolver.notifyChange} and
           * {@link android.content.ContentResolver#registerContentObserver
           * ContentResolver.registerContentObserver}
           * will throw a SecurityException if the caller does not have permission to access
           * the provider (or the provider doesn't exit); otherwise the call will be silently
           * ignored.</li>
           * <li>{@link android.hardware.camera2.CameraDevice#createCaptureRequest
           * CameraDevice.createCaptureRequest} will enable
           * {@link android.hardware.camera2.CaptureRequest#CONTROL_ENABLE_ZSL} by default for
           * still image capture.</li>
           * <li>WallpaperManager's {@link android.app.WallpaperManager#getWallpaperFile},
           * {@link android.app.WallpaperManager#getDrawable},
           * {@link android.app.WallpaperManager#getFastDrawable},
           * {@link android.app.WallpaperManager#peekDrawable}, and
           * {@link android.app.WallpaperManager#peekFastDrawable} will throw an exception
           * if you can not access the wallpaper.</li>
           * <li>The behavior of
           * {@link android.hardware.usb.UsbDeviceConnection#requestWait UsbDeviceConnection.requestWait}
           * is modified as per the documentation there.</li>
           * <li>{@link StrictMode.VmPolicy.Builder#detectAll StrictMode.VmPolicy.Builder.detectAll}
           * will also enable {@link StrictMode.VmPolicy.Builder#detectContentUriWithoutPermission}
           * and {@link StrictMode.VmPolicy.Builder#detectUntaggedSockets}.</li>
           * <li>{@link StrictMode.ThreadPolicy.Builder#detectAll StrictMode.ThreadPolicy.Builder.detectAll}
           * will also enable {@link StrictMode.ThreadPolicy.Builder#detectUnbufferedIo}.</li>
           * <li>{@link android.provider.DocumentsContract}'s various methods will throw failure
           * exceptions back to the caller instead of returning null.
           * <li>{@link View#hasFocusable View.hasFocusable} now includes auto-focusable views.</li>
           * <li>{@link android.view.SurfaceView} will no longer always change the underlying
           * Surface object when something about it changes; apps need to look at the current
           * state of the object to determine which things they are interested in have changed.</li>
           * <li>{@link android.view.WindowManager.LayoutParams#TYPE_APPLICATION_OVERLAY} must be
           * used for overlay windows, other system overlay window types are not allowed.</li>
           * <li>{@link android.view.ViewTreeObserver#addOnDrawListener
           * ViewTreeObserver.addOnDrawListener} will throw an exception if called from within
           * onDraw.</li>
           * <li>{@link android.graphics.Canvas#setBitmap Canvas.setBitmap} will no longer preserve
           * the current matrix and clip stack of the canvas.</li>
           * <li>{@link android.widget.ListPopupWindow#setHeight ListPopupWindow.setHeight}
           * will throw an exception if a negative height is supplied.</li>
           * <li>{@link android.widget.TextView} will use internationalized input for numbers,
           * dates, and times.</li>
           * <li>{@link android.widget.Toast} must be used for showing toast windows; the toast
           * window type can not be directly used.</li>
           * <li>{@link android.net.wifi.WifiManager#getConnectionInfo WifiManager.getConnectionInfo}
           * requires that the caller hold the location permission to return BSSID/SSID</li>
           * <li>{@link android.net.wifi.p2p.WifiP2pManager#requestPeers WifiP2pManager.requestPeers}
           * requires the caller hold the location permission.</li>
           * <li>{@link android.R.attr#maxAspectRatio} defaults to 0, meaning there is no restriction
           * on the app's maximum aspect ratio (so it can be stretched to fill larger screens).</li>
           * <li>{@link android.R.attr#focusable} defaults to a new state ({@code auto}) where it will
           * inherit the value of {@link android.R.attr#clickable} unless explicitly overridden.</li>
           * <li>A default theme-appropriate focus-state highlight will be supplied to all Views
           * which don't provide a focus-state drawable themselves. This can be disabled by setting
           * {@link android.R.attr#defaultFocusHighlightEnabled} to false.</li>
           * </ul>
           */
          public static final int O = 26;
  
          /**
           * O MR1.
           *
           * <p>Applications targeting this or a later release will get these
           * new changes in behavior. For more information about this release, see
           * <a href="/about/versions/oreo/android-8.1">Android 8.1 features and
           * APIs</a>.</p>
           * <ul>
           * <li>Apps exporting and linking to apk shared libraries must explicitly
           * enumerate all signing certificates in a consistent order.</li>
           * <li>{@link android.R.attr#screenOrientation} can not be used to request a fixed
           * orientation if the associated activity is not fullscreen and opaque.</li>
           * </ul>
           *
           */
          public static final int O_MR1 = 27;
  
          /**
           * P.
           *
           * <p>Applications targeting this or a later release will get these
           * new changes in behavior. For more information about this release, see the
           * <a href="/about/versions/pie/">Android 9 Pie overview</a>.</p>
           * <ul>
           * <li>{@link android.app.Service#startForeground Service.startForeground} requires
           * that apps hold the permission
           * {@link android.Manifest.permission#FOREGROUND_SERVICE}.</li>
           * <li>{@link android.widget.LinearLayout} will always remeasure weighted children,
           * even if there is no excess space.</li>
           * </ul>
           *
           */
          public static final int P = 28;
  
          /**
           * Q.
           * <p>
           * <em>Why? Why, to give you a taste of your future, a preview of things
           * to come. Con permiso, Capitan. The hall is rented, the orchestra
           * engaged. It's now time to see if you can dance.</em>
           */
          public static final int Q = 29;
      }
  
      /** The type of build, like "user" or "eng". */
      public static final String TYPE = getString("ro.build.type");
  
      /** Comma-separated tags describing the build, like "unsigned,debug". */
      public static final String TAGS = getString("ro.build.tags");
  
      /** A string that uniquely identifies this build.  Do not attempt to parse this value. */
      public static final String FINGERPRINT = deriveFingerprint();
  
      /**
       * Some devices split the fingerprint components between multiple
       * partitions, so we might derive the fingerprint at runtime.
       */
      private static String deriveFingerprint() {
          String finger = SystemProperties.get("ro.build.fingerprint");
          if (TextUtils.isEmpty(finger)) {
              finger = getString("ro.product.brand") + '/' +
                      getString("ro.product.name") + '/' +
                      getString("ro.product.device") + ':' +
                      getString("ro.build.version.release") + '/' +
                      getString("ro.build.id") + '/' +
                      getString("ro.build.version.incremental") + ':' +
                      getString("ro.build.type") + '/' +
                      getString("ro.build.tags");
          }
          return finger;
      }
  
      /**
       * Ensure that raw fingerprint system property is defined. If it was derived
       * dynamically by {@link #deriveFingerprint()} this is where we push the
       * derived value into the property service.
       *
       * @hide
       */
      public static void ensureFingerprintProperty() {
          if (TextUtils.isEmpty(SystemProperties.get("ro.build.fingerprint"))) {
              try {
                  SystemProperties.set("ro.build.fingerprint", FINGERPRINT);
              } catch (IllegalArgumentException e) {
                  Slog.e(TAG, "Failed to set fingerprint property", e);
              }
          }
      }
  
      /**
       * True if Treble is enabled and required for this device.
       *
       * @hide
       */
      public static final boolean IS_TREBLE_ENABLED =
          SystemProperties.getBoolean("ro.treble.enabled", false);
  
      /**
       * Verifies the current flash of the device is consistent with what
       * was expected at build time.
       *
       * Treble devices will verify the Vendor Interface (VINTF). A device
       * launched without Treble:
       *
       * 1) Checks that device fingerprint is defined and that it matches across
       *    various partitions.
       * 2) Verifies radio and bootloader partitions are those expected in the build.
       *
       * @hide
       */
      public static boolean isBuildConsistent() {
          // Don't care on eng builds.  Incremental build may trigger false negative.
          if (IS_ENG) return true;
  
          if (IS_TREBLE_ENABLED) {
              // If we can run this code, the device should already pass AVB.
              // So, we don't need to check AVB here.
              int result = VintfObject.verifyWithoutAvb();
  
              if (result != 0) {
                  Slog.e(TAG, "Vendor interface is incompatible, error="
                          + String.valueOf(result));
              }
  
              return result == 0;
          }
  
          final String system = SystemProperties.get("ro.build.fingerprint");
          final String vendor = SystemProperties.get("ro.vendor.build.fingerprint");
          final String bootimage = SystemProperties.get("ro.bootimage.build.fingerprint");
          final String requiredBootloader = SystemProperties.get("ro.build.expect.bootloader");
          final String currentBootloader = SystemProperties.get("ro.bootloader");
          final String requiredRadio = SystemProperties.get("ro.build.expect.baseband");
          final String currentRadio = SystemProperties.get("gsm.version.baseband");
  
          if (TextUtils.isEmpty(system)) {
              Slog.e(TAG, "Required ro.build.fingerprint is empty!");
              return false;
          }
  
          if (!TextUtils.isEmpty(vendor)) {
              if (!Objects.equals(system, vendor)) {
                  Slog.e(TAG, "Mismatched fingerprints; system reported " + system
                          + " but vendor reported " + vendor);
                  return false;
              }
          }
  
          /* TODO: Figure out issue with checks failing
          if (!TextUtils.isEmpty(bootimage)) {
              if (!Objects.equals(system, bootimage)) {
                  Slog.e(TAG, "Mismatched fingerprints; system reported " + system
                          + " but bootimage reported " + bootimage);
                  return false;
              }
          }
  
          if (!TextUtils.isEmpty(requiredBootloader)) {
              if (!Objects.equals(currentBootloader, requiredBootloader)) {
                  Slog.e(TAG, "Mismatched bootloader version: build requires " + requiredBootloader
                          + " but runtime reports " + currentBootloader);
                  return false;
              }
          }
  
          if (!TextUtils.isEmpty(requiredRadio)) {
              if (!Objects.equals(currentRadio, requiredRadio)) {
                  Slog.e(TAG, "Mismatched radio version: build requires " + requiredRadio
                          + " but runtime reports " + currentRadio);
                  return false;
              }
          }
          */
  
          return true;
      }
  
      /** Build information for a particular device partition. */
      public static class Partition {
          /** The name identifying the system partition. */
          public static final String PARTITION_NAME_SYSTEM = "system";
  
          private final String mName;
          private final String mFingerprint;
          private final long mTimeMs;
  
          private Partition(String name, String fingerprint, long timeMs) {
              mName = name;
              mFingerprint = fingerprint;
              mTimeMs = timeMs;
          }
  
          /** The name of this partition, e.g. "system", or "vendor" */
          @NonNull
          public String getName() {
              return mName;
          }
  
          /** The build fingerprint of this partition, see {@link Build#FINGERPRINT}. */
          @NonNull
          public String getFingerprint() {
              return mFingerprint;
          }
  
          /** The time (ms since epoch), at which this partition was built, see {@link Build#TIME}. */
          public long getBuildTimeMillis() {
              return mTimeMs;
          }
  
          @Override
          public boolean equals(Object o) {
              if (!(o instanceof Partition)) {
                  return false;
              }
              Partition op = (Partition) o;
              return mName.equals(op.mName)
                      && mFingerprint.equals(op.mFingerprint)
                      && mTimeMs == op.mTimeMs;
          }
  
          @Override
          public int hashCode() {
              return Objects.hash(mName, mFingerprint, mTimeMs);
          }
      }
  
      /**
       * Get build information about partitions that have a separate fingerprint defined.
       *
       * The list includes partitions that are suitable candidates for over-the-air updates. This is
       * not an exhaustive list of partitions on the device.
       */
      @NonNull
      public static List<Partition> getFingerprintedPartitions() {
          ArrayList<Partition> partitions = new ArrayList();
  
          String[] names = new String[] {
              "bootimage", "odm", "product", "product_services", Partition.PARTITION_NAME_SYSTEM,
              "vendor"
          };
          for (String name : names) {
              String fingerprint = SystemProperties.get("ro." + name + ".build.fingerprint");
              if (TextUtils.isEmpty(fingerprint)) {
                  continue;
              }
              long time = getLong("ro." + name + ".build.date.utc") * 1000;
              partitions.add(new Partition(name, fingerprint, time));
          }
  
          return partitions;
      }
  
      // The following properties only make sense for internal engineering builds.
  
      /** The time at which the build was produced, given in milliseconds since the UNIX epoch. */
      public static final long TIME = getLong("ro.build.date.utc") * 1000;
      public static final String USER = getString("ro.build.user");
      public static final String HOST = getString("ro.build.host");
  
      /**
       * Returns true if we are running a debug build such as "user-debug" or "eng".
       * @hide
       */
      @UnsupportedAppUsage
      public static final boolean IS_DEBUGGABLE =
              SystemProperties.getInt("ro.debuggable", 0) == 1;
  
      /** {@hide} */
      public static final boolean IS_ENG = "eng".equals(TYPE);
      /** {@hide} */
      public static final boolean IS_USERDEBUG = "userdebug".equals(TYPE);
      /** {@hide} */
      public static final boolean IS_USER = "user".equals(TYPE);
  
      /**
       * Whether this build is running inside a container.
       *
       * We should try to avoid checking this flag if possible to minimize
       * unnecessarily diverging from non-container Android behavior.
       * Checking this flag is acceptable when low-level resources being
       * different, e.g. the availability of certain capabilities, access to
       * system resources being restricted, and the fact that the host OS might
       * handle some features for us.
       * For higher-level behavior differences, other checks should be preferred.
       * @hide
       */
      public static final boolean IS_CONTAINER =
              SystemProperties.getBoolean("ro.boot.container", false);
  
      /**
       * Specifies whether the permissions needed by a legacy app should be
       * reviewed before any of its components can run. A legacy app is one
       * with targetSdkVersion < 23, i.e apps using the old permission model.
       * If review is not required, permissions are reviewed before the app
       * is installed.
       *
       * @hide
       * @removed
       */
      @SystemApi
      public static final boolean PERMISSIONS_REVIEW_REQUIRED = true;
  
      /**
       * Returns the version string for the radio firmware.  May return
       * null (if, for instance, the radio is not currently on).
       */
      public static String getRadioVersion() {
          String propVal = SystemProperties.get(TelephonyProperties.PROPERTY_BASEBAND_VERSION);
          return TextUtils.isEmpty(propVal) ? null : propVal;
      }
  
      @UnsupportedAppUsage
      private static String getString(String property) {
          return SystemProperties.get(property, UNKNOWN);
      }
  
      private static String[] getStringList(String property, String separator) {
          String value = SystemProperties.get(property);
          if (value.isEmpty()) {
              return new String[0];
          } else {
              return value.split(separator);
          }
      }
  
      @UnsupportedAppUsage
      private static long getLong(String property) {
          try {
              return Long.parseLong(SystemProperties.get(property));
          } catch (NumberFormatException e) {
              return -1;
          }
      }
  }
  