com/android/systemui/shared/system/TaskStackChangeListeners.java - platform/prebuilts/fullsdk/sources/android-31 - Git at Google

 /*
  * Copyright (C) 2017 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 com.android.systemui.shared.system;

 import android.app.ActivityManager.RunningTaskInfo;
 import android.app.ActivityTaskManager;
 import android.app.TaskStackListener;
 import android.content.ComponentName;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.Message;
 import android.os.Trace;
 import android.util.Log;
 import android.window.TaskSnapshot;

 import com.android.internal.os.SomeArgs;
 import com.android.systemui.shared.recents.model.ThumbnailData;

 import java.util.ArrayList;
 import java.util.List;

 /**
  * Tracks all the task stack listeners
  */
 public class TaskStackChangeListeners {

     private static final String TAG = TaskStackChangeListeners.class.getSimpleName();
     private static final TaskStackChangeListeners INSTANCE = new TaskStackChangeListeners();

     private final Impl mImpl;

     private TaskStackChangeListeners() {
         mImpl = new Impl(Looper.getMainLooper());
     }

     public static TaskStackChangeListeners getInstance() {
         return INSTANCE;
     }

     /**
      * Registers a task stack listener with the system.
      * This should be called on the main thread.
      */
     public void registerTaskStackListener(TaskStackChangeListener listener) {
         synchronized (mImpl) {
             mImpl.addListener(listener);
         }
     }

     /**
      * Unregisters a task stack listener with the system.
      * This should be called on the main thread.
      */
     public void unregisterTaskStackListener(TaskStackChangeListener listener) {
         synchronized (mImpl) {
             mImpl.removeListener(listener);
         }
     }

     private static class Impl extends TaskStackListener implements Handler.Callback {

         private static final int ON_TASK_STACK_CHANGED = 1;
         private static final int ON_TASK_SNAPSHOT_CHANGED = 2;
         private static final int ON_ACTIVITY_PINNED = 3;
         private static final int ON_ACTIVITY_RESTART_ATTEMPT = 4;
         private static final int ON_ACTIVITY_FORCED_RESIZABLE = 6;
         private static final int ON_ACTIVITY_DISMISSING_DOCKED_STACK = 7;
         private static final int ON_TASK_PROFILE_LOCKED = 8;
         private static final int ON_ACTIVITY_UNPINNED = 10;
         private static final int ON_ACTIVITY_LAUNCH_ON_SECONDARY_DISPLAY_FAILED = 11;
         private static final int ON_TASK_CREATED = 12;
         private static final int ON_TASK_REMOVED = 13;
         private static final int ON_TASK_MOVED_TO_FRONT = 14;
         private static final int ON_ACTIVITY_REQUESTED_ORIENTATION_CHANGE = 15;
         private static final int ON_ACTIVITY_LAUNCH_ON_SECONDARY_DISPLAY_REROUTED = 16;
         private static final int ON_BACK_PRESSED_ON_TASK_ROOT = 17;
         private static final int ON_TASK_DISPLAY_CHANGED = 18;
         private static final int ON_TASK_LIST_UPDATED = 19;
         private static final int ON_TASK_LIST_FROZEN_UNFROZEN = 20;
         private static final int ON_TASK_DESCRIPTION_CHANGED = 21;
         private static final int ON_ACTIVITY_ROTATION = 22;
         private static final int ON_LOCK_TASK_MODE_CHANGED = 23;

         /**
          * List of {@link TaskStackChangeListener} registered from {@link #addListener}.
          */
         private final List<TaskStackChangeListener> mTaskStackListeners = new ArrayList<>();
         private final List<TaskStackChangeListener> mTmpListeners = new ArrayList<>();

         private final Handler mHandler;
         private boolean mRegistered;

         Impl(Looper looper) {
             mHandler = new Handler(looper, this);
         }

         public void addListener(TaskStackChangeListener listener) {
             synchronized (mTaskStackListeners) {
                 mTaskStackListeners.add(listener);
             }
             if (!mRegistered) {
                 // Register mTaskStackListener to IActivityManager only once if needed.
                 try {
                     ActivityTaskManager.getService().registerTaskStackListener(this);
                     mRegistered = true;
                 } catch (Exception e) {
                     Log.w(TAG, "Failed to call registerTaskStackListener", e);
                 }
             }
         }

         public void removeListener(TaskStackChangeListener listener) {
             boolean isEmpty;
             synchronized (mTaskStackListeners) {
                 mTaskStackListeners.remove(listener);
                 isEmpty = mTaskStackListeners.isEmpty();
             }
             if (isEmpty && mRegistered) {
                 // Unregister mTaskStackListener once we have no more listeners
                 try {
                     ActivityTaskManager.getService().unregisterTaskStackListener(this);
                     mRegistered = false;
                 } catch (Exception e) {
                     Log.w(TAG, "Failed to call unregisterTaskStackListener", e);
                 }
             }
         }

         @Override
         public void onTaskStackChanged() {
             // Call the task changed callback for the non-ui thread listeners first. Copy to a set
             // of temp listeners so that we don't lock on mTaskStackListeners while calling all the
             // callbacks. This call is always on the same binder thread, so we can just synchronize
             // on the copying of the listener list.
             synchronized (mTaskStackListeners) {
                 mTmpListeners.addAll(mTaskStackListeners);
             }
             for (int i = mTmpListeners.size() - 1; i >= 0; i--) {
                 mTmpListeners.get(i).onTaskStackChangedBackground();
             }
             mTmpListeners.clear();

             mHandler.removeMessages(ON_TASK_STACK_CHANGED);
             mHandler.sendEmptyMessage(ON_TASK_STACK_CHANGED);
         }

         @Override
         public void onActivityPinned(String packageName, int userId, int taskId, int stackId) {
             mHandler.removeMessages(ON_ACTIVITY_PINNED);
             mHandler.obtainMessage(ON_ACTIVITY_PINNED,
                     new PinnedActivityInfo(packageName, userId, taskId, stackId)).sendToTarget();
         }

         @Override
         public void onActivityUnpinned() {
             mHandler.removeMessages(ON_ACTIVITY_UNPINNED);
             mHandler.sendEmptyMessage(ON_ACTIVITY_UNPINNED);
         }

         @Override
         public void onActivityRestartAttempt(RunningTaskInfo task, boolean homeTaskVisible,
                 boolean clearedTask, boolean wasVisible) {
             final SomeArgs args = SomeArgs.obtain();
             args.arg1 = task;
             args.argi1 = homeTaskVisible ? 1 : 0;
             args.argi2 = clearedTask ? 1 : 0;
             args.argi3 = wasVisible ? 1 : 0;
             mHandler.removeMessages(ON_ACTIVITY_RESTART_ATTEMPT);
             mHandler.obtainMessage(ON_ACTIVITY_RESTART_ATTEMPT, args).sendToTarget();
         }

         @Override
         public void onActivityForcedResizable(String packageName, int taskId, int reason) {
             mHandler.obtainMessage(ON_ACTIVITY_FORCED_RESIZABLE, taskId, reason, packageName)
                     .sendToTarget();
         }

         @Override
         public void onActivityDismissingDockedTask() {
             mHandler.sendEmptyMessage(ON_ACTIVITY_DISMISSING_DOCKED_STACK);
         }

         @Override
         public void onActivityLaunchOnSecondaryDisplayFailed(RunningTaskInfo taskInfo,
                 int requestedDisplayId) {
             mHandler.obtainMessage(ON_ACTIVITY_LAUNCH_ON_SECONDARY_DISPLAY_FAILED,
                     requestedDisplayId,
                     0 /* unused */,
                     taskInfo).sendToTarget();
         }

         @Override
         public void onActivityLaunchOnSecondaryDisplayRerouted(RunningTaskInfo taskInfo,
                 int requestedDisplayId) {
             mHandler.obtainMessage(ON_ACTIVITY_LAUNCH_ON_SECONDARY_DISPLAY_REROUTED,
                     requestedDisplayId, 0 /* unused */, taskInfo).sendToTarget();
         }

         @Override
         public void onTaskProfileLocked(int taskId, int userId) {
             mHandler.obtainMessage(ON_TASK_PROFILE_LOCKED, taskId, userId).sendToTarget();
         }

         @Override
         public void onTaskSnapshotChanged(int taskId, TaskSnapshot snapshot) {
             mHandler.obtainMessage(ON_TASK_SNAPSHOT_CHANGED, taskId, 0, snapshot).sendToTarget();
         }

         @Override
         public void onTaskCreated(int taskId, ComponentName componentName) {
             mHandler.obtainMessage(ON_TASK_CREATED, taskId, 0, componentName).sendToTarget();
         }

         @Override
         public void onTaskRemoved(int taskId) {
             mHandler.obtainMessage(ON_TASK_REMOVED, taskId, 0).sendToTarget();
         }

         @Override
         public void onTaskMovedToFront(RunningTaskInfo taskInfo) {
             mHandler.obtainMessage(ON_TASK_MOVED_TO_FRONT, taskInfo).sendToTarget();
         }

         @Override
         public void onBackPressedOnTaskRoot(RunningTaskInfo taskInfo) {
             mHandler.obtainMessage(ON_BACK_PRESSED_ON_TASK_ROOT, taskInfo).sendToTarget();
         }

         @Override
         public void onActivityRequestedOrientationChanged(int taskId, int requestedOrientation) {
             mHandler.obtainMessage(ON_ACTIVITY_REQUESTED_ORIENTATION_CHANGE, taskId,
                     requestedOrientation).sendToTarget();
         }

         @Override
         public void onTaskDisplayChanged(int taskId, int newDisplayId) {
             mHandler.obtainMessage(ON_TASK_DISPLAY_CHANGED, taskId, newDisplayId).sendToTarget();
         }

         @Override
         public void onRecentTaskListUpdated() {
             mHandler.obtainMessage(ON_TASK_LIST_UPDATED).sendToTarget();
         }

         @Override
         public void onRecentTaskListFrozenChanged(boolean frozen) {
             mHandler.obtainMessage(ON_TASK_LIST_FROZEN_UNFROZEN, frozen ? 1 : 0, 0 /* unused */)
                     .sendToTarget();
         }

         @Override
         public void onTaskDescriptionChanged(RunningTaskInfo taskInfo) {
             mHandler.obtainMessage(ON_TASK_DESCRIPTION_CHANGED, taskInfo).sendToTarget();
         }

         @Override
         public void onActivityRotation(int displayId) {
             mHandler.obtainMessage(ON_ACTIVITY_ROTATION, displayId, 0 /* unused */)
                     .sendToTarget();
         }

         @Override
         public void onLockTaskModeChanged(int mode) {
             mHandler.obtainMessage(ON_LOCK_TASK_MODE_CHANGED, mode, 0 /* unused */).sendToTarget();
         }

         @Override
         public boolean handleMessage(Message msg) {
             synchronized (mTaskStackListeners) {
                 switch (msg.what) {
                     case ON_TASK_STACK_CHANGED: {
                         Trace.beginSection("onTaskStackChanged");
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onTaskStackChanged();
                         }
                         Trace.endSection();
                         break;
                     }
                     case ON_TASK_SNAPSHOT_CHANGED: {
                         Trace.beginSection("onTaskSnapshotChanged");
                         final TaskSnapshot snapshot = (TaskSnapshot) msg.obj;
                         final ThumbnailData thumbnail = new ThumbnailData(snapshot);
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onTaskSnapshotChanged(msg.arg1, thumbnail);
                         }
                         Trace.endSection();
                         break;
                     }
                     case ON_ACTIVITY_PINNED: {
                         final PinnedActivityInfo info = (PinnedActivityInfo) msg.obj;
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onActivityPinned(
                                     info.mPackageName, info.mUserId, info.mTaskId,
                                     info.mStackId);
                         }
                         break;
                     }
                     case ON_ACTIVITY_UNPINNED: {
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onActivityUnpinned();
                         }
                         break;
                     }
                     case ON_ACTIVITY_RESTART_ATTEMPT: {
                         final SomeArgs args = (SomeArgs) msg.obj;
                         final RunningTaskInfo task = (RunningTaskInfo) args.arg1;
                         final boolean homeTaskVisible = args.argi1 != 0;
                         final boolean clearedTask = args.argi2 != 0;
                         final boolean wasVisible = args.argi3 != 0;
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onActivityRestartAttempt(task,
                                     homeTaskVisible, clearedTask, wasVisible);
                         }
                         break;
                     }
                     case ON_ACTIVITY_FORCED_RESIZABLE: {
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onActivityForcedResizable(
                                     (String) msg.obj, msg.arg1, msg.arg2);
                         }
                         break;
                     }
                     case ON_ACTIVITY_DISMISSING_DOCKED_STACK: {
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onActivityDismissingDockedStack();
                         }
                         break;
                     }
                     case ON_ACTIVITY_LAUNCH_ON_SECONDARY_DISPLAY_FAILED: {
                         final RunningTaskInfo info = (RunningTaskInfo) msg.obj;
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i)
                                     .onActivityLaunchOnSecondaryDisplayFailed(info);
                         }
                         break;
                     }
                     case ON_ACTIVITY_LAUNCH_ON_SECONDARY_DISPLAY_REROUTED: {
                         final RunningTaskInfo info = (RunningTaskInfo) msg.obj;
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i)
                                     .onActivityLaunchOnSecondaryDisplayRerouted(info);
                         }
                         break;
                     }
                     case ON_TASK_PROFILE_LOCKED: {
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onTaskProfileLocked(msg.arg1, msg.arg2);
                         }
                         break;
                     }
                     case ON_TASK_CREATED: {
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onTaskCreated(msg.arg1,
                                     (ComponentName) msg.obj);
                         }
                         break;
                     }
                     case ON_TASK_REMOVED: {
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onTaskRemoved(msg.arg1);
                         }
                         break;
                     }
                     case ON_TASK_MOVED_TO_FRONT: {
                         final RunningTaskInfo info = (RunningTaskInfo) msg.obj;
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onTaskMovedToFront(info);
                         }
                         break;
                     }
                     case ON_ACTIVITY_REQUESTED_ORIENTATION_CHANGE: {
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i)
                                     .onActivityRequestedOrientationChanged(msg.arg1, msg.arg2);
                         }
                         break;
                     }
                     case ON_BACK_PRESSED_ON_TASK_ROOT: {
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onBackPressedOnTaskRoot(
                                     (RunningTaskInfo) msg.obj);
                         }
                         break;
                     }
                     case ON_TASK_DISPLAY_CHANGED: {
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onTaskDisplayChanged(msg.arg1, msg.arg2);
                         }
                         break;
                     }
                     case ON_TASK_LIST_UPDATED: {
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onRecentTaskListUpdated();
                         }
                         break;
                     }
                     case ON_TASK_LIST_FROZEN_UNFROZEN: {
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onRecentTaskListFrozenChanged(
                                     msg.arg1 != 0);
                         }
                         break;
                     }
                     case ON_TASK_DESCRIPTION_CHANGED: {
                         final RunningTaskInfo info = (RunningTaskInfo) msg.obj;
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onTaskDescriptionChanged(info);
                         }
                         break;
                     }
                     case ON_ACTIVITY_ROTATION: {
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onActivityRotation(msg.arg1);
                         }
                         break;
                     }
                     case ON_LOCK_TASK_MODE_CHANGED: {
                         for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                             mTaskStackListeners.get(i).onLockTaskModeChanged(msg.arg1);
                         }
                         break;
                     }
                 }
             }
             if (msg.obj instanceof SomeArgs) {
                 ((SomeArgs) msg.obj).recycle();
             }
             return true;
         }
     }

     private static class PinnedActivityInfo {
         final String mPackageName;
         final int mUserId;
         final int mTaskId;
         final int mStackId;

         PinnedActivityInfo(String packageName, int userId, int taskId, int stackId) {
             mPackageName = packageName;
             mUserId = userId;
             mTaskId = taskId;
             mStackId = stackId;
         }
     }
 }
	/*
	* Copyright (C) 2017 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 com.android.systemui.shared.system;

	import android.app.ActivityManager.RunningTaskInfo;
	import android.app.ActivityTaskManager;
	import android.app.TaskStackListener;
	import android.content.ComponentName;
	import android.os.Handler;
	import android.os.Looper;
	import android.os.Message;
	import android.os.Trace;
	import android.util.Log;
	import android.window.TaskSnapshot;

	import com.android.internal.os.SomeArgs;
	import com.android.systemui.shared.recents.model.ThumbnailData;

	import java.util.ArrayList;
	import java.util.List;

	/**
	* Tracks all the task stack listeners
	*/
	public class TaskStackChangeListeners {

	private static final String TAG = TaskStackChangeListeners.class.getSimpleName();
	private static final TaskStackChangeListeners INSTANCE = new TaskStackChangeListeners();

	private final Impl mImpl;

	private TaskStackChangeListeners() {
	mImpl = new Impl(Looper.getMainLooper());
	}

	public static TaskStackChangeListeners getInstance() {
	return INSTANCE;
	}

	/**
	* Registers a task stack listener with the system.
	* This should be called on the main thread.
	*/
	public void registerTaskStackListener(TaskStackChangeListener listener) {
	synchronized (mImpl) {
	mImpl.addListener(listener);
	}
	}

	/**
	* Unregisters a task stack listener with the system.
	* This should be called on the main thread.
	*/
	public void unregisterTaskStackListener(TaskStackChangeListener listener) {
	synchronized (mImpl) {
	mImpl.removeListener(listener);
	}
	}

	private static class Impl extends TaskStackListener implements Handler.Callback {

	private static final int ON_TASK_STACK_CHANGED = 1;
	private static final int ON_TASK_SNAPSHOT_CHANGED = 2;
	private static final int ON_ACTIVITY_PINNED = 3;
	private static final int ON_ACTIVITY_RESTART_ATTEMPT = 4;
	private static final int ON_ACTIVITY_FORCED_RESIZABLE = 6;
	private static final int ON_ACTIVITY_DISMISSING_DOCKED_STACK = 7;
	private static final int ON_TASK_PROFILE_LOCKED = 8;
	private static final int ON_ACTIVITY_UNPINNED = 10;
	private static final int ON_ACTIVITY_LAUNCH_ON_SECONDARY_DISPLAY_FAILED = 11;
	private static final int ON_TASK_CREATED = 12;
	private static final int ON_TASK_REMOVED = 13;
	private static final int ON_TASK_MOVED_TO_FRONT = 14;
	private static final int ON_ACTIVITY_REQUESTED_ORIENTATION_CHANGE = 15;
	private static final int ON_ACTIVITY_LAUNCH_ON_SECONDARY_DISPLAY_REROUTED = 16;
	private static final int ON_BACK_PRESSED_ON_TASK_ROOT = 17;
	private static final int ON_TASK_DISPLAY_CHANGED = 18;
	private static final int ON_TASK_LIST_UPDATED = 19;
	private static final int ON_TASK_LIST_FROZEN_UNFROZEN = 20;
	private static final int ON_TASK_DESCRIPTION_CHANGED = 21;
	private static final int ON_ACTIVITY_ROTATION = 22;
	private static final int ON_LOCK_TASK_MODE_CHANGED = 23;

	/**
	* List of {@link TaskStackChangeListener} registered from {@link #addListener}.
	*/
	private final List<TaskStackChangeListener> mTaskStackListeners = new ArrayList<>();
	private final List<TaskStackChangeListener> mTmpListeners = new ArrayList<>();

	private final Handler mHandler;
	private boolean mRegistered;

	Impl(Looper looper) {
	mHandler = new Handler(looper, this);
	}

	public void addListener(TaskStackChangeListener listener) {
	synchronized (mTaskStackListeners) {
	mTaskStackListeners.add(listener);
	}
	if (!mRegistered) {
	// Register mTaskStackListener to IActivityManager only once if needed.
	try {
	ActivityTaskManager.getService().registerTaskStackListener(this);
	mRegistered = true;
	} catch (Exception e) {
	Log.w(TAG, "Failed to call registerTaskStackListener", e);
	}
	}
	}

	public void removeListener(TaskStackChangeListener listener) {
	boolean isEmpty;
	synchronized (mTaskStackListeners) {
	mTaskStackListeners.remove(listener);
	isEmpty = mTaskStackListeners.isEmpty();
	}
	if (isEmpty && mRegistered) {
	// Unregister mTaskStackListener once we have no more listeners
	try {
	ActivityTaskManager.getService().unregisterTaskStackListener(this);
	mRegistered = false;
	} catch (Exception e) {
	Log.w(TAG, "Failed to call unregisterTaskStackListener", e);
	}
	}
	}

	@Override
	public void onTaskStackChanged() {
	// Call the task changed callback for the non-ui thread listeners first. Copy to a set
	// of temp listeners so that we don't lock on mTaskStackListeners while calling all the
	// callbacks. This call is always on the same binder thread, so we can just synchronize
	// on the copying of the listener list.
	synchronized (mTaskStackListeners) {
	mTmpListeners.addAll(mTaskStackListeners);
	}
	for (int i = mTmpListeners.size() - 1; i >= 0; i--) {
	mTmpListeners.get(i).onTaskStackChangedBackground();
	}
	mTmpListeners.clear();

	mHandler.removeMessages(ON_TASK_STACK_CHANGED);
	mHandler.sendEmptyMessage(ON_TASK_STACK_CHANGED);
	}

	@Override
	public void onActivityPinned(String packageName, int userId, int taskId, int stackId) {
	mHandler.removeMessages(ON_ACTIVITY_PINNED);
	mHandler.obtainMessage(ON_ACTIVITY_PINNED,
	new PinnedActivityInfo(packageName, userId, taskId, stackId)).sendToTarget();
	}

	@Override
	public void onActivityUnpinned() {
	mHandler.removeMessages(ON_ACTIVITY_UNPINNED);
	mHandler.sendEmptyMessage(ON_ACTIVITY_UNPINNED);
	}

	@Override
	public void onActivityRestartAttempt(RunningTaskInfo task, boolean homeTaskVisible,
	boolean clearedTask, boolean wasVisible) {
	final SomeArgs args = SomeArgs.obtain();
	args.arg1 = task;
	args.argi1 = homeTaskVisible ? 1 : 0;
	args.argi2 = clearedTask ? 1 : 0;
	args.argi3 = wasVisible ? 1 : 0;
	mHandler.removeMessages(ON_ACTIVITY_RESTART_ATTEMPT);
	mHandler.obtainMessage(ON_ACTIVITY_RESTART_ATTEMPT, args).sendToTarget();
	}

	@Override
	public void onActivityForcedResizable(String packageName, int taskId, int reason) {
	mHandler.obtainMessage(ON_ACTIVITY_FORCED_RESIZABLE, taskId, reason, packageName)
	.sendToTarget();
	}

	@Override
	public void onActivityDismissingDockedTask() {
	mHandler.sendEmptyMessage(ON_ACTIVITY_DISMISSING_DOCKED_STACK);
	}

	@Override
	public void onActivityLaunchOnSecondaryDisplayFailed(RunningTaskInfo taskInfo,
	int requestedDisplayId) {
	mHandler.obtainMessage(ON_ACTIVITY_LAUNCH_ON_SECONDARY_DISPLAY_FAILED,
	requestedDisplayId,
	0 /* unused */,
	taskInfo).sendToTarget();
	}

	@Override
	public void onActivityLaunchOnSecondaryDisplayRerouted(RunningTaskInfo taskInfo,
	int requestedDisplayId) {
	mHandler.obtainMessage(ON_ACTIVITY_LAUNCH_ON_SECONDARY_DISPLAY_REROUTED,
	requestedDisplayId, 0 /* unused */, taskInfo).sendToTarget();
	}

	@Override
	public void onTaskProfileLocked(int taskId, int userId) {
	mHandler.obtainMessage(ON_TASK_PROFILE_LOCKED, taskId, userId).sendToTarget();
	}

	@Override
	public void onTaskSnapshotChanged(int taskId, TaskSnapshot snapshot) {
	mHandler.obtainMessage(ON_TASK_SNAPSHOT_CHANGED, taskId, 0, snapshot).sendToTarget();
	}

	@Override
	public void onTaskCreated(int taskId, ComponentName componentName) {
	mHandler.obtainMessage(ON_TASK_CREATED, taskId, 0, componentName).sendToTarget();
	}

	@Override
	public void onTaskRemoved(int taskId) {
	mHandler.obtainMessage(ON_TASK_REMOVED, taskId, 0).sendToTarget();
	}

	@Override
	public void onTaskMovedToFront(RunningTaskInfo taskInfo) {
	mHandler.obtainMessage(ON_TASK_MOVED_TO_FRONT, taskInfo).sendToTarget();
	}

	@Override
	public void onBackPressedOnTaskRoot(RunningTaskInfo taskInfo) {
	mHandler.obtainMessage(ON_BACK_PRESSED_ON_TASK_ROOT, taskInfo).sendToTarget();
	}

	@Override
	public void onActivityRequestedOrientationChanged(int taskId, int requestedOrientation) {
	mHandler.obtainMessage(ON_ACTIVITY_REQUESTED_ORIENTATION_CHANGE, taskId,
	requestedOrientation).sendToTarget();
	}

	@Override
	public void onTaskDisplayChanged(int taskId, int newDisplayId) {
	mHandler.obtainMessage(ON_TASK_DISPLAY_CHANGED, taskId, newDisplayId).sendToTarget();
	}

	@Override
	public void onRecentTaskListUpdated() {
	mHandler.obtainMessage(ON_TASK_LIST_UPDATED).sendToTarget();
	}

	@Override
	public void onRecentTaskListFrozenChanged(boolean frozen) {
	mHandler.obtainMessage(ON_TASK_LIST_FROZEN_UNFROZEN, frozen ? 1 : 0, 0 /* unused */)
	.sendToTarget();
	}

	@Override
	public void onTaskDescriptionChanged(RunningTaskInfo taskInfo) {
	mHandler.obtainMessage(ON_TASK_DESCRIPTION_CHANGED, taskInfo).sendToTarget();
	}

	@Override
	public void onActivityRotation(int displayId) {
	mHandler.obtainMessage(ON_ACTIVITY_ROTATION, displayId, 0 /* unused */)
	.sendToTarget();
	}

	@Override
	public void onLockTaskModeChanged(int mode) {
	mHandler.obtainMessage(ON_LOCK_TASK_MODE_CHANGED, mode, 0 /* unused */).sendToTarget();
	}

	@Override
	public boolean handleMessage(Message msg) {
	synchronized (mTaskStackListeners) {
	switch (msg.what) {
	case ON_TASK_STACK_CHANGED: {
	Trace.beginSection("onTaskStackChanged");
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onTaskStackChanged();
	}
	Trace.endSection();
	break;
	}
	case ON_TASK_SNAPSHOT_CHANGED: {
	Trace.beginSection("onTaskSnapshotChanged");
	final TaskSnapshot snapshot = (TaskSnapshot) msg.obj;
	final ThumbnailData thumbnail = new ThumbnailData(snapshot);
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onTaskSnapshotChanged(msg.arg1, thumbnail);
	}
	Trace.endSection();
	break;
	}
	case ON_ACTIVITY_PINNED: {
	final PinnedActivityInfo info = (PinnedActivityInfo) msg.obj;
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onActivityPinned(
	info.mPackageName, info.mUserId, info.mTaskId,
	info.mStackId);
	}
	break;
	}
	case ON_ACTIVITY_UNPINNED: {
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onActivityUnpinned();
	}
	break;
	}
	case ON_ACTIVITY_RESTART_ATTEMPT: {
	final SomeArgs args = (SomeArgs) msg.obj;
	final RunningTaskInfo task = (RunningTaskInfo) args.arg1;
	final boolean homeTaskVisible = args.argi1 != 0;
	final boolean clearedTask = args.argi2 != 0;
	final boolean wasVisible = args.argi3 != 0;
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onActivityRestartAttempt(task,
	homeTaskVisible, clearedTask, wasVisible);
	}
	break;
	}
	case ON_ACTIVITY_FORCED_RESIZABLE: {
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onActivityForcedResizable(
	(String) msg.obj, msg.arg1, msg.arg2);
	}
	break;
	}
	case ON_ACTIVITY_DISMISSING_DOCKED_STACK: {
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onActivityDismissingDockedStack();
	}
	break;
	}
	case ON_ACTIVITY_LAUNCH_ON_SECONDARY_DISPLAY_FAILED: {
	final RunningTaskInfo info = (RunningTaskInfo) msg.obj;
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i)
	.onActivityLaunchOnSecondaryDisplayFailed(info);
	}
	break;
	}
	case ON_ACTIVITY_LAUNCH_ON_SECONDARY_DISPLAY_REROUTED: {
	final RunningTaskInfo info = (RunningTaskInfo) msg.obj;
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i)
	.onActivityLaunchOnSecondaryDisplayRerouted(info);
	}
	break;
	}
	case ON_TASK_PROFILE_LOCKED: {
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onTaskProfileLocked(msg.arg1, msg.arg2);
	}
	break;
	}
	case ON_TASK_CREATED: {
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onTaskCreated(msg.arg1,
	(ComponentName) msg.obj);
	}
	break;
	}
	case ON_TASK_REMOVED: {
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onTaskRemoved(msg.arg1);
	}
	break;
	}
	case ON_TASK_MOVED_TO_FRONT: {
	final RunningTaskInfo info = (RunningTaskInfo) msg.obj;
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onTaskMovedToFront(info);
	}
	break;
	}
	case ON_ACTIVITY_REQUESTED_ORIENTATION_CHANGE: {
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i)
	.onActivityRequestedOrientationChanged(msg.arg1, msg.arg2);
	}
	break;
	}
	case ON_BACK_PRESSED_ON_TASK_ROOT: {
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onBackPressedOnTaskRoot(
	(RunningTaskInfo) msg.obj);
	}
	break;
	}
	case ON_TASK_DISPLAY_CHANGED: {
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onTaskDisplayChanged(msg.arg1, msg.arg2);
	}
	break;
	}
	case ON_TASK_LIST_UPDATED: {
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onRecentTaskListUpdated();
	}
	break;
	}
	case ON_TASK_LIST_FROZEN_UNFROZEN: {
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onRecentTaskListFrozenChanged(
	msg.arg1 != 0);
	}
	break;
	}
	case ON_TASK_DESCRIPTION_CHANGED: {
	final RunningTaskInfo info = (RunningTaskInfo) msg.obj;
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onTaskDescriptionChanged(info);
	}
	break;
	}
	case ON_ACTIVITY_ROTATION: {
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onActivityRotation(msg.arg1);
	}
	break;
	}
	case ON_LOCK_TASK_MODE_CHANGED: {
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onLockTaskModeChanged(msg.arg1);
	}
	break;
	}
	}
	}
	if (msg.obj instanceof SomeArgs) {
	((SomeArgs) msg.obj).recycle();
	}
	return true;
	}
	}

	private static class PinnedActivityInfo {
	final String mPackageName;
	final int mUserId;
	final int mTaskId;
	final int mStackId;

	PinnedActivityInfo(String packageName, int userId, int taskId, int stackId) {
	mPackageName = packageName;
	mUserId = userId;
	mTaskId = taskId;
	mStackId = stackId;
	}
	}
	}