content: /**
   * Copyright (C) 2014 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.app.usage;
  
  import android.annotation.IntDef;
  import android.annotation.Nullable;
  import android.annotation.SystemApi;
  import android.annotation.UnsupportedAppUsage;
  import android.content.res.Configuration;
  import android.os.Build;
  import android.os.Parcel;
  import android.os.Parcelable;
  
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  import java.util.Arrays;
  import java.util.List;
  
  /**
   * A result returned from {@link android.app.usage.UsageStatsManager#queryEvents(long, long)}
   * from which to read {@link android.app.usage.UsageEvents.Event} objects.
   */
  public final class UsageEvents implements Parcelable {
  
      /** @hide */
      public static final String INSTANT_APP_PACKAGE_NAME = "android.instant_app";
  
      /** @hide */
      public static final String INSTANT_APP_CLASS_NAME = "android.instant_class";
  
      /**
       * An event representing a state change for a component.
       */
      public static final class Event {
  
          /**
           * No event type.
           */
          public static final int NONE = 0;
  
          /**
           * A device level event like {@link #DEVICE_SHUTDOWN} does not have package name, but some
           * user code always expect a non-null {@link #mPackage} for every event. Use
           * {@link #DEVICE_EVENT_PACKAGE_NAME} as packageName for these device level events.
           * @hide
           */
          public static final String DEVICE_EVENT_PACKAGE_NAME = "android";
  
          /**
           * @deprecated by {@link #ACTIVITY_RESUMED}
           */
          @Deprecated
          public static final int MOVE_TO_FOREGROUND = 1;
  
          /**
           * An event type denoting that an {@link android.app.Activity} moved to the foreground.
           * This event has a package name and class name associated with it and can be retrieved
           * using {@link #getPackageName()} and {@link #getClassName()}.
           * If a package has multiple activities, this event is reported for each activity that moves
           * to foreground.
           * This event is corresponding to {@link android.app.Activity#onResume()} of the
           * activity's lifecycle.
           */
          public static final int ACTIVITY_RESUMED = MOVE_TO_FOREGROUND;
  
          /**
           * @deprecated by {@link #ACTIVITY_PAUSED}
           */
          @Deprecated
          public static final int MOVE_TO_BACKGROUND = 2;
  
          /**
           * An event type denoting that an {@link android.app.Activity} moved to the background.
           * This event has a package name and class name associated with it and can be retrieved
           * using {@link #getPackageName()} and {@link #getClassName()}.
           * If a package has multiple activities, this event is reported for each activity that moves
           * to background.
           * This event is corresponding to {@link android.app.Activity#onPause()} of the activity's
           * lifecycle.
           */
          public static final int ACTIVITY_PAUSED = MOVE_TO_BACKGROUND;
  
          /**
           * An event type denoting that a component was in the foreground when the stats
           * rolled-over. This is effectively treated as a {@link #ACTIVITY_PAUSED}.
           * {@hide}
           */
          public static final int END_OF_DAY = 3;
  
          /**
           * An event type denoting that a component was in the foreground the previous day.
           * This is effectively treated as a {@link #ACTIVITY_RESUMED}.
           * {@hide}
           */
          public static final int CONTINUE_PREVIOUS_DAY = 4;
  
          /**
           * An event type denoting that the device configuration has changed.
           */
          public static final int CONFIGURATION_CHANGE = 5;
  
          /**
           * An event type denoting that a package was interacted with in some way by the system.
           * @hide
           */
          @SystemApi
          public static final int SYSTEM_INTERACTION = 6;
  
          /**
           * An event type denoting that a package was interacted with in some way by the user.
           */
          public static final int USER_INTERACTION = 7;
  
          /**
           * An event type denoting that an action equivalent to a ShortcutInfo is taken by the user.
           *
           * @see android.content.pm.ShortcutManager#reportShortcutUsed(String)
           */
          public static final int SHORTCUT_INVOCATION = 8;
  
          /**
           * An event type denoting that a package was selected by the user for ChooserActivity.
           * @hide
           */
          public static final int CHOOSER_ACTION = 9;
  
          /**
           * An event type denoting that a notification was viewed by the user.
           * @hide
           */
          @SystemApi
          public static final int NOTIFICATION_SEEN = 10;
  
          /**
           * An event type denoting a change in App Standby Bucket. The new bucket can be
           * retrieved by calling {@link #getAppStandbyBucket()}.
           *
           * @see UsageStatsManager#getAppStandbyBucket()
           */
          public static final int STANDBY_BUCKET_CHANGED = 11;
  
          /**
           * An event type denoting that an app posted an interruptive notification. Visual and
           * audible interruptions are included.
           * @hide
           */
          @SystemApi
          public static final int NOTIFICATION_INTERRUPTION = 12;
  
          /**
           * A Slice was pinned by the default launcher or the default assistant.
           * @hide
           */
          @SystemApi
          public static final int SLICE_PINNED_PRIV = 13;
  
          /**
           * A Slice was pinned by an app.
           * @hide
           */
          @SystemApi
          public static final int SLICE_PINNED = 14;
  
          /**
           * An event type denoting that the screen has gone in to an interactive state (turned
           * on for full user interaction, not ambient display or other non-interactive state).
           */
          public static final int SCREEN_INTERACTIVE = 15;
  
          /**
           * An event type denoting that the screen has gone in to a non-interactive state
           * (completely turned off or turned on only in a non-interactive state like ambient
           * display).
           */
          public static final int SCREEN_NON_INTERACTIVE = 16;
  
          /**
           * An event type denoting that the screen's keyguard has been shown, whether or not
           * the screen is off.
           */
          public static final int KEYGUARD_SHOWN = 17;
  
          /**
           * An event type denoting that the screen's keyguard has been hidden.  This typically
           * happens when the user unlocks their phone after turning it on.
           */
          public static final int KEYGUARD_HIDDEN = 18;
  
          /**
           * An event type denoting start of a foreground service.
           * This event has a package name and class name associated with it and can be retrieved
           * using {@link #getPackageName()} and {@link #getClassName()}.
           * If a package has multiple foreground services, this event is reported for each service
           * that is started.
           */
          public static final int FOREGROUND_SERVICE_START = 19;
  
          /**
           * An event type denoting stop of a foreground service.
           * This event has a package name and class name associated with it and can be retrieved
           * using {@link #getPackageName()} and {@link #getClassName()}.
           * If a package has multiple foreground services, this event is reported for each service
           * that is stopped.
           */
          public static final int FOREGROUND_SERVICE_STOP = 20;
  
          /**
           * An event type denoting that a foreground service is at started state at beginning of a
           * time interval.
           * This is effectively treated as a {@link #FOREGROUND_SERVICE_START}.
           * {@hide}
           */
          public static final int CONTINUING_FOREGROUND_SERVICE = 21;
  
          /**
           * An event type denoting that a foreground service is at started state when the stats
           * rolled-over at the end of a time interval.
           * {@hide}
           */
          public static final int ROLLOVER_FOREGROUND_SERVICE = 22;
  
          /**
           * An activity becomes invisible on the UI, corresponding to
           * {@link android.app.Activity#onStop()} of the activity's lifecycle.
           */
          public static final int ACTIVITY_STOPPED = 23;
  
          /**
           * An activity object is destroyed, corresponding to
           * {@link android.app.Activity#onDestroy()} of the activity's lifecycle.
           * {@hide}
           */
          public static final int ACTIVITY_DESTROYED = 24;
  
          /**
           * The event type demoting that a flush of UsageStatsDatabase to file system. Before the
           * flush all usage stats need to be updated to latest timestamp to make sure the most
           * up to date stats are persisted.
           * @hide
           */
          public static final int FLUSH_TO_DISK = 25;
  
          /**
           * An event type denoting that the Android runtime underwent a shutdown process.
           * A DEVICE_SHUTDOWN event should be treated as if all started activities and foreground
           * services are now stopped and no explicit {@link #ACTIVITY_STOPPED} and
           * {@link #FOREGROUND_SERVICE_STOP} events will be generated for them.
           *
           * <p>The DEVICE_SHUTDOWN timestamp is actually the last time UsageStats database is
           * persisted before the actual shutdown. Events (if there are any) between this timestamp
           * and the actual shutdown is not persisted in the database. So any open events without
           * matching close events between DEVICE_SHUTDOWN and {@link #DEVICE_STARTUP} should be
           * ignored because the closing time is unknown.</p>
           */
          public static final int DEVICE_SHUTDOWN = 26;
  
          /**
           * An event type denoting that the Android runtime started up. This could be after a
           * shutdown or a runtime restart. Any open events without matching close events between
           * {@link #DEVICE_SHUTDOWN} and DEVICE_STARTUP should be ignored because the closing time is
           * unknown.
           */
          public static final int DEVICE_STARTUP = 27;
  
          /**
           * Keep in sync with the greatest event type value.
           * @hide
           */
          public static final int MAX_EVENT_TYPE = 27;
  
          /** @hide */
          public static final int FLAG_IS_PACKAGE_INSTANT_APP = 1 << 0;
  
          /** @hide */
          @IntDef(flag = true, prefix = { "FLAG_" }, value = {
                  FLAG_IS_PACKAGE_INSTANT_APP,
          })
          @Retention(RetentionPolicy.SOURCE)
          public @interface EventFlags {}
  
          /**
           * Bitwise OR all valid flag constants to create this constant.
           * @hide
           */
          public static final int VALID_FLAG_BITS = FLAG_IS_PACKAGE_INSTANT_APP;
  
          /**
           * {@hide}
           */
          @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
          public String mPackage;
  
          /**
           * {@hide}
           */
          @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
          public String mClass;
  
          /**
           * {@hide}
           */
          public int mInstanceId;
  
          /**
           * {@hide}
           */
          public String mTaskRootPackage;
  
          /**
           * {@hide}
           */
          public String mTaskRootClass;
  
          /**
           * {@hide}
           */
          @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
          public long mTimeStamp;
  
          /**
           * {@hide}
           */
          @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
          public int mEventType;
  
          /**
           * Only present for {@link #CONFIGURATION_CHANGE} event types.
           * {@hide}
           */
          @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
          public Configuration mConfiguration;
  
          /**
           * ID of the shortcut.
           * Only present for {@link #SHORTCUT_INVOCATION} event types.
           * {@hide}
           */
          public String mShortcutId;
  
          /**
           * Action type passed to ChooserActivity
           * Only present for {@link #CHOOSER_ACTION} event types.
           * {@hide}
           */
          public String mAction;
  
          /**
           * Content type passed to ChooserActivity.
           * Only present for {@link #CHOOSER_ACTION} event types.
           * {@hide}
           */
          public String mContentType;
  
          /**
           * Content annotations passed to ChooserActivity.
           * Only present for {@link #CHOOSER_ACTION} event types.
           * {@hide}
           */
          public String[] mContentAnnotations;
  
          /**
           * The app standby bucket assigned and reason. Bucket is the high order 16 bits, reason
           * is the low order 16 bits.
           * Only present for {@link #STANDBY_BUCKET_CHANGED} event types
           * {@hide}
           */
          public int mBucketAndReason;
  
          /**
           * The id of the {@link android.app.NotificationChannel} to which an interruptive
           * notification was posted.
           * Only present for {@link #NOTIFICATION_INTERRUPTION} event types.
           * {@hide}
           */
          public String mNotificationChannelId;
  
          /** @hide */
          @EventFlags
          public int mFlags;
  
          public Event() {
          }
  
          /** @hide */
          public Event(int type,  long timeStamp) {
              mEventType = type;
              mTimeStamp = timeStamp;
          }
  
          /** @hide */
          public Event(Event orig) {
              mPackage = orig.mPackage;
              mClass = orig.mClass;
              mInstanceId = orig.mInstanceId;
              mTaskRootPackage = orig.mTaskRootPackage;
              mTaskRootClass = orig.mTaskRootClass;
              mTimeStamp = orig.mTimeStamp;
              mEventType = orig.mEventType;
              mConfiguration = orig.mConfiguration;
              mShortcutId = orig.mShortcutId;
              mAction = orig.mAction;
              mContentType = orig.mContentType;
              mContentAnnotations = orig.mContentAnnotations;
              mFlags = orig.mFlags;
              mBucketAndReason = orig.mBucketAndReason;
              mNotificationChannelId = orig.mNotificationChannelId;
          }
  
          /**
           * The package name of the source of this event.
           */
          public String getPackageName() {
              return mPackage;
          }
  
          /**
           * Indicates whether it is an instant app.
           * @hide
           */
          @SystemApi
          public boolean isInstantApp() {
              return (mFlags & FLAG_IS_PACKAGE_INSTANT_APP) == FLAG_IS_PACKAGE_INSTANT_APP;
          }
  
          /**
           * The class name of the source of this event. This may be null for
           * certain events.
           */
          public String getClassName() {
              return mClass;
          }
  
          /**
           *  An activity can be instantiated multiple times, this is the unique activity instance ID.
           *  For non-activity class, instance ID is always zero.
           *  @hide
           */
          @SystemApi
          public int getInstanceId() {
              return mInstanceId;
          }
  
          /**
           * The package name of the task root when this event was reported.
           * Or {@code null} for queries from apps without {@link
           * android.Manifest.permission#PACKAGE_USAGE_STATS}
           * @hide
           */
          @SystemApi
          public @Nullable String getTaskRootPackageName() {
              return mTaskRootPackage;
          }
  
          /**
           * The class name of the task root when this event was reported.
           * Or {@code null} for queries from apps without {@link
           * android.Manifest.permission#PACKAGE_USAGE_STATS}
           * @hide
           */
          @SystemApi
          public @Nullable String getTaskRootClassName() {
              return mTaskRootClass;
          }
  
          /**
           * The time at which this event occurred, measured in milliseconds since the epoch.
           * <p/>
           * See {@link System#currentTimeMillis()}.
           */
          public long getTimeStamp() {
              return mTimeStamp;
          }
  
          /**
           * The event type.
           * @see #ACTIVITY_PAUSED
           * @see #ACTIVITY_RESUMED
           * @see #CONFIGURATION_CHANGE
           * @see #USER_INTERACTION
           * @see #STANDBY_BUCKET_CHANGED
           * @see #FOREGROUND_SERVICE_START
           * @see #FOREGROUND_SERVICE_STOP
           * @see #ACTIVITY_STOPPED
           */
          public int getEventType() {
              return mEventType;
          }
  
          /**
           * Returns a {@link Configuration} for this event if the event is of type
           * {@link #CONFIGURATION_CHANGE}, otherwise it returns null.
           */
          public Configuration getConfiguration() {
              return mConfiguration;
          }
  
          /**
           * Returns the ID of a {@link android.content.pm.ShortcutInfo} for this event
           * if the event is of type {@link #SHORTCUT_INVOCATION}, otherwise it returns null.
           *
           * @see android.content.pm.ShortcutManager#reportShortcutUsed(String)
           */
          public String getShortcutId() {
              return mShortcutId;
          }
  
          /**
           * Returns the standby bucket of the app, if the event is of type
           * {@link #STANDBY_BUCKET_CHANGED}, otherwise returns 0.
           * @return the standby bucket associated with the event.
           * @hide
           */
          public int getStandbyBucket() {
              return (mBucketAndReason & 0xFFFF0000) >>> 16;
          }
  
          /**
           * Returns the standby bucket of the app, if the event is of type
           * {@link #STANDBY_BUCKET_CHANGED}, otherwise returns 0.
           * @return the standby bucket associated with the event.
           *
           */
          public int getAppStandbyBucket() {
              return (mBucketAndReason & 0xFFFF0000) >>> 16;
          }
  
          /**
           * Returns the reason for the bucketing, if the event is of type
           * {@link #STANDBY_BUCKET_CHANGED}, otherwise returns 0. Reason values include
           * the main reason which is one of REASON_MAIN_*, OR'ed with REASON_SUB_*, if there
           * are sub-reasons for the main reason, such as REASON_SUB_USAGE_* when the main reason
           * is REASON_MAIN_USAGE.
           * @hide
           */
          public int getStandbyReason() {
              return mBucketAndReason & 0x0000FFFF;
          }
  
          /**
           * Returns the ID of the {@link android.app.NotificationChannel} for this event if the
           * event is of type {@link #NOTIFICATION_INTERRUPTION}, otherwise it returns null;
           * @hide
           */
          @SystemApi
          public String getNotificationChannelId() {
              return mNotificationChannelId;
          }
  
          /** @hide */
          public Event getObfuscatedIfInstantApp() {
              if (!isInstantApp()) {
                  return this;
              }
              final Event ret = new Event(this);
              ret.mPackage = INSTANT_APP_PACKAGE_NAME;
              ret.mClass = INSTANT_APP_CLASS_NAME;
  
              // Note there are other string fields too, but they're for app shortcuts and choosers,
              // which instant apps can't use anyway, so there's no need to hide them.
              return ret;
          }
      }
  
      // Only used when creating the resulting events. Not used for reading/unparceling.
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
      private List<Event> mEventsToWrite = null;
  
      // Only used for reading/unparceling events.
      @UnsupportedAppUsage
      private Parcel mParcel = null;
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
      private final int mEventCount;
  
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
      private int mIndex = 0;
  
      // Only used when parceling events. If false, task roots will be omitted from the parcel
      private final boolean mIncludeTaskRoots;
  
      /*
       * In order to save space, since ComponentNames will be duplicated everywhere,
       * we use a map and index into it.
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
      private String[] mStringPool;
  
      /**
       * Construct the iterator from a parcel.
       * {@hide}
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
      public UsageEvents(Parcel in) {
          byte[] bytes = in.readBlob();
          Parcel data = Parcel.obtain();
          data.unmarshall(bytes, 0, bytes.length);
          data.setDataPosition(0);
          mEventCount = data.readInt();
          mIndex = data.readInt();
          if (mEventCount > 0) {
              mStringPool = data.createStringArray();
  
              final int listByteLength = data.readInt();
              final int positionInParcel = data.readInt();
              mParcel = Parcel.obtain();
              mParcel.setDataPosition(0);
              mParcel.appendFrom(data, data.dataPosition(), listByteLength);
              mParcel.setDataSize(mParcel.dataPosition());
              mParcel.setDataPosition(positionInParcel);
          }
          mIncludeTaskRoots = true;
      }
  
      /**
       * Create an empty iterator.
       * {@hide}
       */
      UsageEvents() {
          mEventCount = 0;
          mIncludeTaskRoots = true;
      }
  
      /**
       * Construct the iterator in preparation for writing it to a parcel.
       * Defaults to excluding task roots from the parcel.
       * {@hide}
       */
      public UsageEvents(List<Event> events, String[] stringPool) {
          this(events, stringPool, false);
      }
  
      /**
       * Construct the iterator in preparation for writing it to a parcel.
       * {@hide}
       */
      public UsageEvents(List<Event> events, String[] stringPool, boolean includeTaskRoots) {
          mStringPool = stringPool;
          mEventCount = events.size();
          mEventsToWrite = events;
          mIncludeTaskRoots = includeTaskRoots;
      }
  
      /**
       * Returns whether or not there are more events to read using
       * {@link #getNextEvent(android.app.usage.UsageEvents.Event)}.
       *
       * @return true if there are more events, false otherwise.
       */
      public boolean hasNextEvent() {
          return mIndex < mEventCount;
      }
  
      /**
       * Retrieve the next {@link android.app.usage.UsageEvents.Event} from the collection and put the
       * resulting data into {@code eventOut}.
       *
       * @param eventOut The {@link android.app.usage.UsageEvents.Event} object that will receive the
       *                 next event data.
       * @return true if an event was available, false if there are no more events.
       */
      public boolean getNextEvent(Event eventOut) {
          if (mIndex >= mEventCount) {
              return false;
          }
  
          readEventFromParcel(mParcel, eventOut);
  
          mIndex++;
          if (mIndex >= mEventCount) {
              mParcel.recycle();
              mParcel = null;
          }
          return true;
      }
  
      /**
       * Resets the collection so that it can be iterated over from the beginning.
       *
       * @hide When this object is iterated to completion, the parcel is destroyed and
       * so resetToStart doesn't work.
       */
      public void resetToStart() {
          mIndex = 0;
          if (mParcel != null) {
              mParcel.setDataPosition(0);
          }
      }
  
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
      private int findStringIndex(String str) {
          final int index = Arrays.binarySearch(mStringPool, str);
          if (index < 0) {
              throw new IllegalStateException("String '" + str + "' is not in the string pool");
          }
          return index;
      }
  
      /**
       * Writes a single event to the parcel. Modify this when updating {@link Event}.
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
      private void writeEventToParcel(Event event, Parcel p, int flags) {
          final int packageIndex;
          if (event.mPackage != null) {
              packageIndex = findStringIndex(event.mPackage);
          } else {
              packageIndex = -1;
          }
  
          final int classIndex;
          if (event.mClass != null) {
              classIndex = findStringIndex(event.mClass);
          } else {
              classIndex = -1;
          }
  
          final int taskRootPackageIndex;
          if (mIncludeTaskRoots && event.mTaskRootPackage != null) {
              taskRootPackageIndex = findStringIndex(event.mTaskRootPackage);
          } else {
              taskRootPackageIndex = -1;
          }
  
          final int taskRootClassIndex;
          if (mIncludeTaskRoots && event.mTaskRootClass != null) {
              taskRootClassIndex = findStringIndex(event.mTaskRootClass);
          } else {
              taskRootClassIndex = -1;
          }
          p.writeInt(packageIndex);
          p.writeInt(classIndex);
          p.writeInt(event.mInstanceId);
          p.writeInt(taskRootPackageIndex);
          p.writeInt(taskRootClassIndex);
          p.writeInt(event.mEventType);
          p.writeLong(event.mTimeStamp);
  
          switch (event.mEventType) {
              case Event.CONFIGURATION_CHANGE:
                  event.mConfiguration.writeToParcel(p, flags);
                  break;
              case Event.SHORTCUT_INVOCATION:
                  p.writeString(event.mShortcutId);
                  break;
              case Event.CHOOSER_ACTION:
                  p.writeString(event.mAction);
                  p.writeString(event.mContentType);
                  p.writeStringArray(event.mContentAnnotations);
                  break;
              case Event.STANDBY_BUCKET_CHANGED:
                  p.writeInt(event.mBucketAndReason);
                  break;
              case Event.NOTIFICATION_INTERRUPTION:
                  p.writeString(event.mNotificationChannelId);
                  break;
          }
          p.writeInt(event.mFlags);
      }
  
      /**
       * Reads a single event from the parcel. Modify this when updating {@link Event}.
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
      private void readEventFromParcel(Parcel p, Event eventOut) {
          final int packageIndex = p.readInt();
          if (packageIndex >= 0) {
              eventOut.mPackage = mStringPool[packageIndex];
          } else {
              eventOut.mPackage = null;
          }
  
          final int classIndex = p.readInt();
          if (classIndex >= 0) {
              eventOut.mClass = mStringPool[classIndex];
          } else {
              eventOut.mClass = null;
          }
          eventOut.mInstanceId = p.readInt();
  
          final int taskRootPackageIndex = p.readInt();
          if (taskRootPackageIndex >= 0) {
              eventOut.mTaskRootPackage = mStringPool[taskRootPackageIndex];
          } else {
              eventOut.mTaskRootPackage = null;
          }
  
          final int taskRootClassIndex = p.readInt();
          if (taskRootClassIndex >= 0) {
              eventOut.mTaskRootClass = mStringPool[taskRootClassIndex];
          } else {
              eventOut.mTaskRootClass = null;
          }
  
          eventOut.mEventType = p.readInt();
          eventOut.mTimeStamp = p.readLong();
  
          // Fill out the event-dependant fields.
          eventOut.mConfiguration = null;
          eventOut.mShortcutId = null;
          eventOut.mAction = null;
          eventOut.mContentType = null;
          eventOut.mContentAnnotations = null;
          eventOut.mNotificationChannelId = null;
  
          switch (eventOut.mEventType) {
              case Event.CONFIGURATION_CHANGE:
                  // Extract the configuration for configuration change events.
                  eventOut.mConfiguration = Configuration.CREATOR.createFromParcel(p);
                  break;
              case Event.SHORTCUT_INVOCATION:
                  eventOut.mShortcutId = p.readString();
                  break;
              case Event.CHOOSER_ACTION:
                  eventOut.mAction = p.readString();
                  eventOut.mContentType = p.readString();
                  eventOut.mContentAnnotations = p.createStringArray();
                  break;
              case Event.STANDBY_BUCKET_CHANGED:
                  eventOut.mBucketAndReason = p.readInt();
                  break;
              case Event.NOTIFICATION_INTERRUPTION:
                  eventOut.mNotificationChannelId = p.readString();
                  break;
          }
          eventOut.mFlags = p.readInt();
      }
  
      @Override
      public int describeContents() {
          return 0;
      }
  
      @Override
      public void writeToParcel(Parcel dest, int flags) {
          Parcel data = Parcel.obtain();
          data.writeInt(mEventCount);
          data.writeInt(mIndex);
          if (mEventCount > 0) {
              data.writeStringArray(mStringPool);
  
              if (mEventsToWrite != null) {
                  // Write out the events
                  Parcel p = Parcel.obtain();
                  try {
                      p.setDataPosition(0);
                      for (int i = 0; i < mEventCount; i++) {
                          final Event event = mEventsToWrite.get(i);
                          writeEventToParcel(event, p, flags);
                      }
  
                      final int listByteLength = p.dataPosition();
  
                      // Write the total length of the data.
                      data.writeInt(listByteLength);
  
                      // Write our current position into the data.
                      data.writeInt(0);
  
                      // Write the data.
                      data.appendFrom(p, 0, listByteLength);
                  } finally {
                      p.recycle();
                  }
  
              } else if (mParcel != null) {
                  // Write the total length of the data.
                  data.writeInt(mParcel.dataSize());
  
                  // Write out current position into the data.
                  data.writeInt(mParcel.dataPosition());
  
                  // Write the data.
                  data.appendFrom(mParcel, 0, mParcel.dataSize());
              } else {
                  throw new IllegalStateException(
                          "Either mParcel or mEventsToWrite must not be null");
              }
          }
          // Data can be too large for a transact. Write the data as a Blob, which will be written to
          // ashmem if too large.
          dest.writeBlob(data.marshall());
      }
  
      public static final @android.annotation.NonNull Creator<UsageEvents> CREATOR = new Creator<UsageEvents>() {
          @Override
          public UsageEvents createFromParcel(Parcel source) {
              return new UsageEvents(source);
          }
  
          @Override
          public UsageEvents[] newArray(int size) {
              return new UsageEvents[size];
          }
      };
  }
  