1、构建相关的TaskView，装载到对应的ViewGroup
b站免费视频教程讲解：
https://www.bilibili.com/video/BV1wj411o7A9/
//packages/apps/Car/Launcher/src/com/android/car/carlauncher/CarLauncher.java
void onCreate() {
//ignore
setContentView(R.layout.car_launcher);
// We don't want to show Map card unnecessarily for the headless user 0.
if (!UserHelperLite.isHeadlessSystemUser(getUserId())) {
ViewGroup mapsCard = findViewById(R.id.maps_card);
if (mapsCard != null) {
//这里获取了mapsCard后，接下来就是构造出对应的TaskView
setUpTaskView(mapsCard);
}
}
//ignore
}
//进行TaskView相关的设置
private void setUpTaskView(ViewGroup parent) {
//把TaskViewManager进行构造
mTaskViewManager = new TaskViewManager(this,
new HandlerExecutor(getMainThreadHandler()), mCarActivityManagerRef);
//创建对应的TaskView
mTaskViewManager.createTaskView(taskView -> {
taskView.setListener(getMainExecutor(), mTaskViewListener);
//把TaskView添加到了mapsCard
parent.addView(taskView);
mTaskView = taskView;
});
}
//packages/apps/Car/Launcher/src/com/android/car/carlauncher/TaskViewManager.java
public TaskViewManager(@UiContext Context context, HandlerExecutor handlerExecutor,
AtomicReference<CarActivityManager> carActivityManagerRef) {
mContext = context;
mExecutor = handlerExecutor;
//构造对应的ShellTaskOrganizer
mTaskOrganizer = new ShellTaskOrganizer(mExecutor, mContext);
//把TaskOrganizer进行对应的注册
initTaskOrganizer(carActivityManagerRef, transactionPool);
}
//构造出TaskView
void createTaskView(Consumer<TaskView> onCreate) {
CarTaskView taskView = new CarTaskView(mContext, mTaskOrganizer, mSyncQueue);
mExecutor.execute(() -> {
onCreate.accept(taskView);
});
}
总结：
1、构建出对应的TaskViewManager，主要是注册和初始化TaskOrganizer
2、创建出相关的TaskView即SurfaceView，并放置到CarLauncher的ViewGroup
时序图如下：
2、相关Activity的启动情况
启动Activity相关堆栈
07-26 17:25:48.075 1584 1584 I lsm3333 : TaskView startActivity
07-26 17:25:48.075 1584 1584 I lsm3333 : java.lang.Exception
07-26 17:25:48.075 1584 1584 I lsm3333 : at com.android.wm.shell.TaskView.startActivity(TaskView.java:179)
07-26 17:25:48.075 1584 1584 I lsm3333 : at com.android.car.carlauncher.CarLauncher.startMapsInTaskView(CarLauncher.java:373)
07-26 17:25:48.075 1584 1584 I lsm3333 : at com.android.car.carlauncher.CarLauncher.-$$Nest$mstartMapsInTaskView(Unknown Source:0)
07-26 17:25:48.075 1584 1584 I lsm3333 : at com.android.car.carlauncher.CarLauncher$1.onInitialized(CarLauncher.java:108)
07-26 17:25:48.075 1584 1584 I lsm3333 : at com.android.wm.shell.TaskView.lambda$surfaceCreated$11$com-android-wm-shell-TaskView(TaskView.java:416)
07-26 17:25:48.075 1584 1584 I lsm3333 : at com.android.wm.shell.TaskView$$ExternalSyntheticLambda11.run(Unknown Source:2)
07-26 17:25:48.075 1584 1584 I lsm3333 : at android.os.Handler.handleCallback(Handler.java:942)
07-26 17:25:48.075 1584 1584 I lsm3333 : at android.os.Handler.dispatchMessage(Handler.java:99)
07-26 17:25:48.075 1584 1584 I lsm3333 : at android.os.Looper.loopOnce(Looper.java:201)
07-26 17:25:48.075 1584 1584 I lsm3333 : at android.os.Looper.loop(Looper.java:288)
07-26 17:25:48.075 1584 1584 I lsm3333 : at android.app.ActivityThread.main(ActivityThread.java:7898)
07-26 17:25:48.075 1584 1584 I lsm3333 : at java.lang.reflect.Method.invoke(Native Method)
07-26 17:25:48.075 1584 1584 I lsm3333 : at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
07-26 17:25:48.075 1584 1584 I lsm3333 : at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
主要代码流程步骤如下：
TaskView.onInitialized -->CarLauncher.startMapsInTaskView -->
TaskView.startActivity -->TaskView.prepareActivityOptions -->PendingIntent.send
相关时序图如下：
3、Task启动后，进行相关的surface重新挂载操作
Task启动完成后进行相关的onTaskAppeared回调：
相关堆栈：
07-26 17:33:03.205 2931 2931 I lsm3333 : onTaskAppeared taskInfo = TaskInfo{userId=10 taskId=1000013 displayId=0 isRunning=true baseIntent=Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.android.car.mapsplaceholder/.MapsPlaceholderActivity } baseActivity=ComponentInfo{com.android.car.mapsplaceholder/com.android.car.mapsplaceholder.MapsPlaceholderActivity} topActivity=ComponentInfo{com.android.car.mapsplaceholder/com.android.car.mapsplaceholder.MapsPlaceholderActivity} origActivity=null realActivity=ComponentInfo{com.android.car.mapsplaceholder/com.android.car.mapsplaceholder.MapsPlaceholderActivity} numActivities=1 lastActiveTime=462943 supportsSplitScreenMultiWindow=false supportsMultiWindow=true resizeMode=2 isResizeable=true minWidth=-1 minHeight=-1 defaultMinSize=220 token=WCT{android.window.IWindowContainerToken$Stub$Proxy@8b9b010} topActivityType=1 pictureInPictureParams=null shouldDockBigOverlays=false launchIntoPipHostTaskId=0 displayCutoutSafeInsets=null topActivityInfo=ActivityInfo{7150709 com.android.car.mapsplaceholder.MapsPlaceholderActivity} launchCookies=[android.os.Binder@a4aa911] positionInParent=Point(303, 57) parentTaskId=-1 isFocused=true isVisible=false isSleeping=false topActivityInSizeCompat=false topActivityEligibleForLetterboxEducation= false locusId=null displayAreaFeatureId=1 cameraCompatControlState=hidden}
07-26 17:33:03.205 2931 2931 I lsm3333 : java.lang.Exception
07-26 17:33:03.205 2931 2931 I lsm3333 : at com.android.wm.shell.TaskView.onTaskAppeared(TaskView.java:313)
07-26 17:33:03.205 2931 2931 I lsm3333 : at com.android.car.carlauncher.CarTaskView.onTaskAppeared(CarTaskView.java:46)
07-26 17:33:03.205 2931 2931 I lsm3333 : at com.android.wm.shell.ShellTaskOrganizer.onTaskAppeared(ShellTaskOrganizer.java:440)
07-26 17:33:03.205 2931 2931 I lsm3333 : at com.android.wm.shell.ShellTaskOrganizer.onTaskAppeared(ShellTaskOrganizer.java:429)
07-26 17:33:03.205 2931 2931 I lsm3333 : at android.window.TaskOrganizer$1.lambda$onTaskAppeared$4$android-window-TaskOrganizer$1(TaskOrganizer.java:306)
07-26 17:33:03.205 2931 2931 I lsm3333 : at android.window.TaskOrganizer$1$$ExternalSyntheticLambda6.run(Unknown Source:6)
07-26 17:33:03.205 2931 2931 I lsm3333 : at android.os.Handler.handleCallback(Handler.java:942)
07-26 17:33:03.205 2931 2931 I lsm3333 : at android.os.Handler.dispatchMessage(Handler.java:99)
07-26 17:33:03.205 2931 2931 I lsm3333 : at android.os.Looper.loopOnce(Looper.java:201)
07-26 17:33:03.205 2931 2931 I lsm3333 : at android.os.Looper.loop(Looper.java:288)
07-26 17:33:03.205 2931 2931 I lsm3333 : at android.app.ActivityThread.main(ActivityThread.java:7898)
07-26 17:33:03.205 2931 2931 I lsm3333 : at java.lang.reflect.Method.invoke(Native Method)
07-26 17:33:03.205 2931 2931 I lsm3333 : at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
07-26 17:33:03.205 2931 2931 I lsm3333 : at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
相关业务代码的执行：
@Override
public void onTaskAppeared(ActivityManager.RunningTaskInfo taskInfo,
SurfaceControl leash) {
if (mSurfaceCreated) {
// Surface is ready, so just reparent the task to this surface control
//核心的关键方法，对task的surface进行从新reparent到surfaceview的surafce下，这样实现了activity之间的内嵌
mTransaction.reparent(mTaskLeash, getSurfaceControl())
.show(mTaskLeash)
.apply();
} else {
}
//这里会再次进行相关的位置变化通知，该方法会触发重新对task的bounds进行更新
onLocationChanged();
if (taskInfo.taskDescription != null) {
int backgroundColor = taskInfo.taskDescription.getBackgroundColor();
mSyncQueue.runInSync((t) -> {
setResizeBackgroundColor(t, backgroundColor);
});
}
if (mListener != null) {
final int taskId = taskInfo.taskId;
final ComponentName baseActivity = taskInfo.baseActivity;
mListenerExecutor.execute(() -> {
//回调对应的CarLauncher的onTaskCreated方法
mListener.onTaskCreated(taskId, baseActivity);
});
}
}
4、Task启动过程通知流程详细分析
1、首先要监听Task相关的显示情况，必须要注册相关的监听方法
进行相关的ShellTaskOrganizer构造
//省略相关方法
public TaskViewManager(@UiContext Context context, HandlerExecutor handlerExecutor,
AtomicReference<CarActivityManager> carActivityManagerRef) {
//构造对应的TaskOrganizer
mTaskOrganizer = new ShellTaskOrganizer(mExecutor, mContext);
initTaskOrganizer(carActivityManagerRef, transactionPool);
}
private void initTaskOrganizer(AtomicReference<CarActivityManager> carActivityManagerRef,
TransactionPool transactionPool) {
//这个方法关键注册到systemserver端，建立联系
List<TaskAppearedInfo> taskAppearedInfos = mTaskOrganizer.registerOrganizer();
}
public List<TaskAppearedInfo> registerOrganizer() {
try {
//这里就是正式的跨进程，把mInterface传递给systemserver方便回调
return mTaskOrganizerController.registerTaskOrganizer(mInterface).getList();
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
总结：上面几步最重要就是与systemserver端建立了联系，而且把相关的回调的mInterface传递到了systemserver端，这样systemserver端就可以在Task有变化情况下通过mInterface通知到客户端
2、监听后怎么准确的通知到TaskView
上面第一步已经实现了CarLauncher可以监听Task的相关行为，注意这里肯定是所有的Task行为，但是TaskView它自身只关心Map相关的Task，那么这里是怎么精准通知的呢？
这里可以通过一个堆栈看看：
07-26 17:33:03.205 2931 2931 I lsm3333 : at com.android.car.carlauncher.CarTaskView.onTaskAppeared(CarTaskView.java:46)
07-26 17:33:03.205 2931 2931 I lsm3333 : at com.android.wm.shell.ShellTaskOrganizer.onTaskAppeared(ShellTaskOrganizer.java:440)
07-26 17:33:03.205 2931 2931 I lsm3333 : at com.android.wm.shell.ShellTaskOrganizer.onTaskAppeared(ShellTaskOrganizer.java:429)
07-26 17:33:03.205 2931 2931 I lsm3333 : at android.window.TaskOrganizer$1.lambda$onTaskAppeared$4$android-window-TaskOrganizer$1(TaskOrganizer.java:306)
可以明显看出这里systemserver跨进程回调到了ShellTaskOrganizer的onTaskAppeared，在这个方法进行精准匹配到TaskView关心的Task变化，然后进行通知
private void onTaskAppeared(TaskAppearedInfo info) {
final int taskId = info.getTaskInfo().taskId;
mTasks.put(taskId, info);
//这里进行对应的TaskListener获取，这里就是TaskView的listener获取，本身TaskView是有实现 ShellTaskOrganizer.TaskListener接口的
final TaskListener listener =
getTaskListener(info.getTaskInfo(), true /*removeLaunchCookieIfNeeded*/);
//获取了TaskView的Listener后就可以进行通知了，从而他知道TaskView的onTaskAppeared
if (listener != null) {
listener.onTaskAppeared(info.getTaskInfo(), info.getLeash());
}
}
接下来就是重点分析这个getTaskListener，是怎么可以准确知道当前通知的Task信息就是TaskView对应的Task信息
private TaskListener getTaskListener(RunningTaskInfo runningTaskInfo,
boolean removeLaunchCookieIfNeeded) {
//这里的launchCookies属于系统端回调带的
final ArrayList<IBinder> launchCookies = runningTaskInfo.launchCookies;
for (int i = launchCookies.size() - 1; i >= 0; --i) {
final IBinder cookie = launchCookies.get(i);
//拿系统端的回调的cookie与本地进行匹配，配上了就进行获取了相关的listener
listener = mLaunchCookieToListener.get(cookie);
if (removeLaunchCookieIfNeeded) {
// Remove the cookie and add the listener.
mLaunchCookieToListener.remove(cookie);
mTaskListeners.put(taskId, listener);
}
return listener;
}
return mTaskListeners.get(taskListenerType);
}
上面看出核心就是服务端会在TaskInfo中有对应的cookie，然后本地也有对应的cookie集合map，这样实现的准确匹配。
那么这个cookie来自哪里呢？哈哈，其实这个cookie都是来自客户端的，在启动activity时候就构造设置了
public void startActivity(@NonNull PendingIntent pendingIntent, @Nullable Intent fillInIntent,
@NonNull ActivityOptions options, @Nullable Rect launchBounds) {
//在这prepareActivityOptions进行了相关参数的设置
prepareActivityOptions(options, launchBounds);
//省略
}
来看看prepareActivityOptions方法：
private void prepareActivityOptions(ActivityOptions options, Rect launchBounds) {
//构造出了这个cookie，其实就是binder对象
final Binder launchCookie = new Binder();
mShellExecutor.execute(() -> {
//这里把这个cookie进行相关的存放到map
mTaskOrganizer.setPendingLaunchCookieListener(launchCookie, this);
});
options.setLaunchBounds(launchBounds);
//把cookie设置进了option，可以传递到systemserver端
options.setLaunchCookie(launchCookie);
options.setLaunchWindowingMode(WINDOWING_MODE_MULTI_WINDOW);
options.setRemoveWithTaskOrganizer(true);
}
public void setPendingLaunchCookieListener(IBinder cookie, TaskListener listener) {
synchronized (mLock) {
//把这里的cookie放到了mLaunchCookieToListener的集合中
mLaunchCookieToListener.put(cookie, listener);
}
}
通过这个cookie即可以精准的把系统回调的TaskInfo匹配到对应的TaskView
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