com/android/wm/shell/common/TaskStackListenerImpl.java - platform/prebuilts/fullsdk/sources/android-31 - Git at Google

 /*
  * Copyright (C) 2020 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.wm.shell.common;

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

 import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.os.SomeArgs;

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

 /**
  * Implementation of a {@link android.app.TaskStackListener}.
  */
 public class TaskStackListenerImpl extends TaskStackListener implements Handler.Callback {
     private static final String TAG = TaskStackListenerImpl.class.getSimpleName();

     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 = 5;
     private static final int ON_ACTIVITY_DISMISSING_DOCKED_STACK = 6;
     private static final int ON_TASK_PROFILE_LOCKED = 7;
     private static final int ON_ACTIVITY_UNPINNED = 8;
     private static final int ON_ACTIVITY_LAUNCH_ON_SECONDARY_DISPLAY_FAILED = 9;
     private static final int ON_TASK_CREATED = 10;
     private static final int ON_TASK_REMOVED = 11;
     private static final int ON_TASK_MOVED_TO_FRONT = 12;
     private static final int ON_ACTIVITY_REQUESTED_ORIENTATION_CHANGE = 13;
     private static final int ON_ACTIVITY_LAUNCH_ON_SECONDARY_DISPLAY_REROUTED = 14;
     private static final int ON_BACK_PRESSED_ON_TASK_ROOT = 15;
     private static final int ON_TASK_DISPLAY_CHANGED = 16;
     private static final int ON_TASK_LIST_UPDATED = 17;
     private static final int ON_TASK_LIST_FROZEN_UNFROZEN = 18;
     private static final int ON_TASK_DESCRIPTION_CHANGED = 19;
     private static final int ON_ACTIVITY_ROTATION = 20;

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

     private final IActivityTaskManager mActivityTaskManager;
     // NOTE: In this case we do want to use a handler since we rely on the message system to
     // efficiently dedupe sequential calls
     private Handler mMainHandler;

     public TaskStackListenerImpl(Handler mainHandler) {
         mActivityTaskManager = ActivityTaskManager.getService();
         mMainHandler = new Handler(mainHandler.getLooper(), this);
     }

     @VisibleForTesting
     TaskStackListenerImpl(IActivityTaskManager activityTaskManager) {
         mActivityTaskManager = activityTaskManager;
     }

     @VisibleForTesting
     void setHandler(Handler mainHandler) {
         mMainHandler = mainHandler;
     }

     public void addListener(TaskStackListenerCallback listener) {
         final boolean wasEmpty;
         synchronized (mTaskStackListeners) {
             wasEmpty = mTaskStackListeners.isEmpty();
             mTaskStackListeners.add(listener);
         }
         if (wasEmpty) {
             // Register mTaskStackListener to IActivityManager only once if needed.
             try {
                 mActivityTaskManager.registerTaskStackListener(this);
             } catch (Exception e) {
                 Log.w(TAG, "Failed to call registerTaskStackListener", e);
             }
         }
     }

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

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

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

     @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();

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

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

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

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

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

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

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

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

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

     @Override
     public void onActivityPinned(String packageName, int userId, int taskId, int stackId) {
         SomeArgs args = SomeArgs.obtain();
         args.arg1 = packageName;
         args.argi1 = userId;
         args.argi2 = taskId;
         args.argi3 = stackId;
         mMainHandler.removeMessages(ON_ACTIVITY_PINNED);
         mMainHandler.obtainMessage(ON_ACTIVITY_PINNED, args).sendToTarget();
     }

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

     @Override
     public void onActivityRestartAttempt(ActivityManager.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;
         mMainHandler.removeMessages(ON_ACTIVITY_RESTART_ATTEMPT);
         mMainHandler.obtainMessage(ON_ACTIVITY_RESTART_ATTEMPT, args).sendToTarget();
     }

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

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

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

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

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

     @Override
     public void onActivityRotation(int displayId) {
         mMainHandler.obtainMessage(ON_ACTIVITY_ROTATION, displayId, 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");
                     for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                         mTaskStackListeners.get(i).onTaskSnapshotChanged(msg.arg1,
                                 (TaskSnapshot) msg.obj);
                     }
                     Trace.endSection();
                     break;
                 }
                 case ON_ACTIVITY_PINNED: {
                     final SomeArgs args = (SomeArgs) msg.obj;
                     for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
                         mTaskStackListeners.get(i).onActivityPinned((String) args.arg1, args.argi1,
                                 args.argi2, args.argi3);
                     }
                     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 ActivityManager.RunningTaskInfo
                             task = (ActivityManager.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 ActivityManager.RunningTaskInfo
                             info = (ActivityManager.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 ActivityManager.RunningTaskInfo
                             info = (ActivityManager.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 ActivityManager.RunningTaskInfo
                             info = (ActivityManager.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(
                                 (ActivityManager.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 ActivityManager.RunningTaskInfo
                             info = (ActivityManager.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;
                 }
             }
         }
         if (msg.obj instanceof SomeArgs) {
             ((SomeArgs) msg.obj).recycle();
         }
         return true;
     }
 }
	/*
	* Copyright (C) 2020 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.wm.shell.common;

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

	import com.android.internal.annotations.VisibleForTesting;
	import com.android.internal.os.SomeArgs;

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

	/**
	* Implementation of a {@link android.app.TaskStackListener}.
	*/
	public class TaskStackListenerImpl extends TaskStackListener implements Handler.Callback {
	private static final String TAG = TaskStackListenerImpl.class.getSimpleName();

	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 = 5;
	private static final int ON_ACTIVITY_DISMISSING_DOCKED_STACK = 6;
	private static final int ON_TASK_PROFILE_LOCKED = 7;
	private static final int ON_ACTIVITY_UNPINNED = 8;
	private static final int ON_ACTIVITY_LAUNCH_ON_SECONDARY_DISPLAY_FAILED = 9;
	private static final int ON_TASK_CREATED = 10;
	private static final int ON_TASK_REMOVED = 11;
	private static final int ON_TASK_MOVED_TO_FRONT = 12;
	private static final int ON_ACTIVITY_REQUESTED_ORIENTATION_CHANGE = 13;
	private static final int ON_ACTIVITY_LAUNCH_ON_SECONDARY_DISPLAY_REROUTED = 14;
	private static final int ON_BACK_PRESSED_ON_TASK_ROOT = 15;
	private static final int ON_TASK_DISPLAY_CHANGED = 16;
	private static final int ON_TASK_LIST_UPDATED = 17;
	private static final int ON_TASK_LIST_FROZEN_UNFROZEN = 18;
	private static final int ON_TASK_DESCRIPTION_CHANGED = 19;
	private static final int ON_ACTIVITY_ROTATION = 20;

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

	private final IActivityTaskManager mActivityTaskManager;
	// NOTE: In this case we do want to use a handler since we rely on the message system to
	// efficiently dedupe sequential calls
	private Handler mMainHandler;

	public TaskStackListenerImpl(Handler mainHandler) {
	mActivityTaskManager = ActivityTaskManager.getService();
	mMainHandler = new Handler(mainHandler.getLooper(), this);
	}

	@VisibleForTesting
	TaskStackListenerImpl(IActivityTaskManager activityTaskManager) {
	mActivityTaskManager = activityTaskManager;
	}

	@VisibleForTesting
	void setHandler(Handler mainHandler) {
	mMainHandler = mainHandler;
	}

	public void addListener(TaskStackListenerCallback listener) {
	final boolean wasEmpty;
	synchronized (mTaskStackListeners) {
	wasEmpty = mTaskStackListeners.isEmpty();
	mTaskStackListeners.add(listener);
	}
	if (wasEmpty) {
	// Register mTaskStackListener to IActivityManager only once if needed.
	try {
	mActivityTaskManager.registerTaskStackListener(this);
	} catch (Exception e) {
	Log.w(TAG, "Failed to call registerTaskStackListener", e);
	}
	}
	}

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

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

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

	@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();

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

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

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

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

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

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

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

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

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

	@Override
	public void onActivityPinned(String packageName, int userId, int taskId, int stackId) {
	SomeArgs args = SomeArgs.obtain();
	args.arg1 = packageName;
	args.argi1 = userId;
	args.argi2 = taskId;
	args.argi3 = stackId;
	mMainHandler.removeMessages(ON_ACTIVITY_PINNED);
	mMainHandler.obtainMessage(ON_ACTIVITY_PINNED, args).sendToTarget();
	}

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

	@Override
	public void onActivityRestartAttempt(ActivityManager.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;
	mMainHandler.removeMessages(ON_ACTIVITY_RESTART_ATTEMPT);
	mMainHandler.obtainMessage(ON_ACTIVITY_RESTART_ATTEMPT, args).sendToTarget();
	}

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

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

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

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

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

	@Override
	public void onActivityRotation(int displayId) {
	mMainHandler.obtainMessage(ON_ACTIVITY_ROTATION, displayId, 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");
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onTaskSnapshotChanged(msg.arg1,
	(TaskSnapshot) msg.obj);
	}
	Trace.endSection();
	break;
	}
	case ON_ACTIVITY_PINNED: {
	final SomeArgs args = (SomeArgs) msg.obj;
	for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
	mTaskStackListeners.get(i).onActivityPinned((String) args.arg1, args.argi1,
	args.argi2, args.argi3);
	}
	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 ActivityManager.RunningTaskInfo
	task = (ActivityManager.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 ActivityManager.RunningTaskInfo
	info = (ActivityManager.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 ActivityManager.RunningTaskInfo
	info = (ActivityManager.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 ActivityManager.RunningTaskInfo
	info = (ActivityManager.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(
	(ActivityManager.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 ActivityManager.RunningTaskInfo
	info = (ActivityManager.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;
	}
	}
	}
	if (msg.obj instanceof SomeArgs) {
	((SomeArgs) msg.obj).recycle();
	}
	return true;
	}
	}