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/*
* Copyright (C) 2021 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.car.carlauncher.taskstack;
import android.app.ActivityManager;
import android.app.ActivityTaskManager;
import android.app.TaskStackListener;
import android.content.ComponentName;
import android.os.Build;
import android.os.Handler;
import android.os.RemoteException;
import android.util.Log;
import com.android.wm.shell.common.HandlerExecutor;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executor;
/** Organizer of many task stack listeners for the car launcher application. */
public class TaskStackChangeListeners {
private static final String TAG = TaskStackChangeListeners.class.getSimpleName();
private static final boolean DEBUG = Build.IS_DEBUGGABLE;
private static final TaskStackChangeListeners INSTANCE = new TaskStackChangeListeners(
new HandlerExecutor(Handler.getMain()));
private final Impl mImpl;
private TaskStackChangeListeners(Executor executor) {
mImpl = new Impl(executor);
}
/** Returns a singleton instance of the {@link TaskStackChangeListeners}. */
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(TaskStackListener listener) {
synchronized (mImpl) {
mImpl.addListener(listener);
}
if (DEBUG) {
Log.d(TAG, "registerTaskStackListener: " + listener);
}
}
/**
* Unregisters a task stack listener with the system.
* This should be called on the main thread.
*/
public void unregisterTaskStackListener(TaskStackListener listener) {
synchronized (mImpl) {
mImpl.removeListener(listener);
}
if (DEBUG) {
Log.d(TAG, "unregisterTaskStackListener: " + listener);
}
}
private static class Impl extends TaskStackListener {
private final List<TaskStackListener> mTaskStackListeners = new ArrayList<>();
private final Executor mExecutor;
private boolean mRegistered;
Impl(Executor executor) {
mExecutor = executor;
}
public void addListener(TaskStackListener 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(TaskStackListener 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() throws RemoteException {
mExecutor.execute(() -> {
synchronized (mTaskStackListeners) {
for (int i = 0; i < mTaskStackListeners.size(); i++) {
try {
mTaskStackListeners.get(i).onTaskStackChanged();
} catch (RemoteException e) {
Log.e(TAG, "onTaskStackChanged failed", e);
}
}
}
});
}
@Override
public void onTaskCreated(int taskId, ComponentName componentName) throws RemoteException {
mExecutor.execute(() -> {
synchronized (mTaskStackListeners) {
for (int i = 0; i < mTaskStackListeners.size(); i++) {
try {
mTaskStackListeners.get(i).onTaskCreated(taskId, componentName);
} catch (RemoteException e) {
Log.e(TAG, "onTaskCreated failed", e);
}
}
}
});
}
@Override
public void onTaskRemoved(int taskId) throws RemoteException {
mExecutor.execute(() -> {
synchronized (mTaskStackListeners) {
for (int i = 0; i < mTaskStackListeners.size(); i++) {
try {
mTaskStackListeners.get(i).onTaskRemoved(taskId);
} catch (RemoteException e) {
Log.e(TAG, "onTaskRemoved failed", e);
}
}
}
});
}
@Override
public void onTaskMovedToFront(ActivityManager.RunningTaskInfo taskInfo)
throws RemoteException {
mExecutor.execute(() -> {
synchronized (mTaskStackListeners) {
for (int i = 0; i < mTaskStackListeners.size(); i++) {
try {
mTaskStackListeners.get(i).onTaskMovedToFront(taskInfo);
} catch (RemoteException e) {
Log.e(TAG, "onTaskMovedToFront failed", e);
}
}
}
});
}
@Override
public void onTaskFocusChanged(int taskId, boolean focused) {
mExecutor.execute(() -> {
synchronized (mTaskStackListeners) {
for (int i = 0; i < mTaskStackListeners.size(); i++) {
mTaskStackListeners.get(i).onTaskFocusChanged(taskId, focused);
}
}
});
}
@Override
public void onActivityRestartAttempt(ActivityManager.RunningTaskInfo task,
boolean homeTaskVisible, boolean clearedTask, boolean wasVisible) {
mExecutor.execute(() -> {
synchronized (mTaskStackListeners) {
for (TaskStackListener listener : mTaskStackListeners) {
try {
listener.onActivityRestartAttempt(
task, homeTaskVisible, clearedTask, wasVisible);
} catch (RemoteException e) {
Log.e(TAG, "onActivityRestartAttempt failed", e);
}
}
}
});
}
}
}
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