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/*
* Copyright (C) 2018 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.quickstep;
import static com.android.quickstep.TaskUtils.checkCurrentOrManagedUserId;
import android.annotation.TargetApi;
import android.app.ActivityManager;
import android.content.ComponentCallbacks2;
import android.content.Context;
import android.os.Build;
import android.os.HandlerThread;
import android.os.Process;
import android.os.RemoteException;
import android.util.Log;
import com.android.launcher3.util.MainThreadInitializedObject;
import com.android.systemui.shared.recents.ISystemUiProxy;
import com.android.systemui.shared.recents.model.Task;
import com.android.systemui.shared.recents.model.ThumbnailData;
import com.android.systemui.shared.system.ActivityManagerWrapper;
import com.android.systemui.shared.system.TaskStackChangeListener;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Consumer;
/**
* Singleton class to load and manage recents model.
*/
@TargetApi(Build.VERSION_CODES.O)
public class RecentsModel extends TaskStackChangeListener {
private static final String TAG = "RecentsModel";
// We do not need any synchronization for this variable as its only written on UI thread.
public static final MainThreadInitializedObject<RecentsModel> INSTANCE =
new MainThreadInitializedObject<>(RecentsModel::new);
private final List<TaskThumbnailChangeListener> mThumbnailChangeListeners = new ArrayList<>();
private final Context mContext;
private ISystemUiProxy mSystemUiProxy;
private final RecentTasksList mTaskList;
private final TaskIconCache mIconCache;
private final TaskThumbnailCache mThumbnailCache;
private RecentsModel(Context context) {
mContext = context;
HandlerThread loaderThread = new HandlerThread("TaskThumbnailIconCache",
Process.THREAD_PRIORITY_BACKGROUND);
loaderThread.start();
mTaskList = new RecentTasksList(context);
mIconCache = new TaskIconCache(context, loaderThread.getLooper());
mThumbnailCache = new TaskThumbnailCache(context, loaderThread.getLooper());
ActivityManagerWrapper.getInstance().registerTaskStackListener(this);
}
public TaskIconCache getIconCache() {
return mIconCache;
}
public TaskThumbnailCache getThumbnailCache() {
return mThumbnailCache;
}
/**
* Fetches the list of recent tasks.
*
* @param callback The callback to receive the task plan once its complete or null. This is
* always called on the UI thread.
* @return the request id associated with this call.
*/
public int getTasks(Consumer<ArrayList<Task>> callback) {
return mTaskList.getTasks(false /* loadKeysOnly */, callback);
}
/**
* @return The task id of the running task, or -1 if there is no current running task.
*/
public static int getRunningTaskId() {
ActivityManager.RunningTaskInfo runningTask =
ActivityManagerWrapper.getInstance().getRunningTask();
return runningTask != null ? runningTask.id : -1;
}
/**
* @return Whether the provided {@param changeId} is the latest recent tasks list id.
*/
public boolean isTaskListValid(int changeId) {
return mTaskList.isTaskListValid(changeId);
}
/**
* Finds and returns the task key associated with the given task id.
*
* @param callback The callback to receive the task key if it is found or null. This is always
* called on the UI thread.
*/
public void findTaskWithId(int taskId, Consumer<Task.TaskKey> callback) {
mTaskList.getTasks(true /* loadKeysOnly */, (tasks) -> {
for (Task task : tasks) {
if (task.key.id == taskId) {
callback.accept(task.key);
return;
}
}
callback.accept(null);
});
}
@Override
public void onTaskStackChangedBackground() {
if (!mThumbnailCache.isPreloadingEnabled()) {
// Skip if we aren't preloading
return;
}
int currentUserId = Process.myUserHandle().getIdentifier();
if (!checkCurrentOrManagedUserId(currentUserId, mContext)) {
// Skip if we are not the current user
return;
}
// Keep the cache up to date with the latest thumbnails
int runningTaskId = RecentsModel.getRunningTaskId();
mTaskList.getTaskKeys(mThumbnailCache.getCacheSize(), tasks -> {
for (Task task : tasks) {
if (task.key.id == runningTaskId) {
// Skip the running task, it's not going to have an up-to-date snapshot by the
// time the user next enters overview
continue;
}
mThumbnailCache.updateThumbnailInCache(task);
}
});
}
@Override
public void onTaskSnapshotChanged(int taskId, ThumbnailData snapshot) {
mThumbnailCache.updateTaskSnapShot(taskId, snapshot);
for (int i = mThumbnailChangeListeners.size() - 1; i >= 0; i--) {
Task task = mThumbnailChangeListeners.get(i).onTaskThumbnailChanged(taskId, snapshot);
if (task != null) {
task.thumbnail = snapshot;
}
}
}
@Override
public void onTaskRemoved(int taskId) {
Task.TaskKey dummyKey = new Task.TaskKey(taskId, 0, null, null, 0, 0);
mThumbnailCache.remove(dummyKey);
}
public void setSystemUiProxy(ISystemUiProxy systemUiProxy) {
mSystemUiProxy = systemUiProxy;
}
public ISystemUiProxy getSystemUiProxy() {
return mSystemUiProxy;
}
public void onTrimMemory(int level) {
if (level == ComponentCallbacks2.TRIM_MEMORY_UI_HIDDEN) {
mThumbnailCache.getHighResLoadingState().setVisible(false);
}
if (level == ComponentCallbacks2.TRIM_MEMORY_RUNNING_CRITICAL) {
// Clear everything once we reach a low-mem situation
mThumbnailCache.clear();
mIconCache.clear();
}
}
public void onOverviewShown(boolean fromHome, String tag) {
if (mSystemUiProxy == null) {
return;
}
try {
mSystemUiProxy.onOverviewShown(fromHome);
} catch (RemoteException e) {
Log.w(tag,
"Failed to notify SysUI of overview shown from " + (fromHome ? "home" : "app")
+ ": ", e);
}
}
public void addThumbnailChangeListener(TaskThumbnailChangeListener listener) {
mThumbnailChangeListeners.add(listener);
}
public void removeThumbnailChangeListener(TaskThumbnailChangeListener listener) {
mThumbnailChangeListeners.remove(listener);
}
public interface TaskThumbnailChangeListener {
Task onTaskThumbnailChanged(int taskId, ThumbnailData thumbnailData);
}
}
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