Android R WindowManagerService模块 WMS整体架构及启动过程
Posted wa2231a
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DisplayArea是android R上新添加的容器,目的就是将复杂的窗口层级管理简单化、低耦合。
而在树结构中,各个容器结构如下:
可以看到,在树结构中,根节点为RootWindowContainer,叶子节点为WindowState。 正是通过这种结构,WMS中将系统中所有的窗口显示管理得井井有条,并将所有窗口以Surface的形式送到SurfacaFlinger中进行合成和显示。
2.WMS启动流程
接下来我们看下WMS的启动过程。WindowManagerService没有继承与SystemService,而是直接继承了IWindowManager.Stub接口,因此启动过程中,和SytemService的启动有区别。在system_server中,通过以下这些操作完成了WMS的启动:
// frameworks/base/services/java/com/android/server/SystemServer.java
private void startOtherServices(@NonNull TimingsTraceAndSlog t)
// 创建WMS
wm = WindowManagerService.main(context, inputManager, !mFirstBoot, mOnlyCore,
new PhoneWindowManager(), mActivityManagerService.mActivityTaskManager);
// 进行初始化
wm.onInitReady();
// 设置InputCallback接口
inputManager.setWindowManagerCallbacks(wm.getInputManagerCallback());
// 进行Display配置更新
wm.displayReady();
// 系统启动完成
wm.systemReady();
// 计算Configuration
final Configuration config = wm.computeNewConfiguration(DEFAULT_DISPLAY);
DisplayMetrics metrics = new DisplayMetrics();
context.getDisplay().getMetrics(metrics);
context.getResources().updateConfiguration(config, metrics);
下面对以上操作分别进行分析。
1.1.WMS#main()创建WMS对象
在执行main()方法后,最终会在android.display线程去创建WMS的实例:
// frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java
private WindowManagerService(Context context, InputManagerService inputManager,
boolean showBootMsgs, boolean onlyCore, WindowManagerPolicy policy,
ActivityTaskManagerService atm, Supplier<SurfaceControl.Transaction> transactionFactory,
Supplier surfaceFactory,
Function<SurfaceSession, SurfaceControl.Builder> surfaceControlFactory)
…
// Tranaction对象
mTransaction = mTransactionFactory.get();
// 创建WindowAnimator对象
mAnimator = new WindowAnimator(this);
// 创建RootWindowContainer对象
mRoot = new RootWindowContainer(this);
// 创建WindowSurfacePlacer对象
mWindowPlacerLocked = new WindowSurfacePlacer(this);
// 创建TaskSnapshotController对象
mTaskSnapshotController = new TaskSnapshotController(this);
// 创建DisplayWindowListenerController对象
mDisplayNotificationController = new DisplayWindowListenerController(this);
…
// 创建SurfaceAnimationRunner对象
mSurfaceAnimationRunner = new SurfaceAnimationRunner(mTransactionFactory,
mPowerManagerInternal);
// 创建TaskPositioningController
mTaskPositioningController = new TaskPositioningController(
this, mInputManager, mActivityTaskManager, mH.getLooper());
// 创建DragDropController对象
mDragDropController = new DragDropController(this, mH.getLooper());
// 创建EmbeddedWindowController
mEmbeddedWindowController = new EmbeddedWindowController(mAtmService);
// 创建 DisplayAreaPolicy.Provider对象
mDisplayAreaPolicyProvider = DisplayAreaPolicy.Provider.fromResources(
mContext.getResources());
…
构造方法中,创建了WMS所用到的多个对象。
2.2.WMS#onInitReady()对Policy进行初始化
接下来执行onInitReady()
方法进行初始化,这个方法中,在android.ui线程中调用WindowManagerPolicy#init()方法进行初始化:
// frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java
public void init(Context context, IWindowManager windowManager,
WindowManagerFuncs windowManagerFuncs)
mContext = context;
mWindowManager = windowManager;
mWindowManagerFuncs = windowManagerFuncs;
…
这个方法中做了大量的初始化操作。PhoneWindowManager继承于WindowManagerPolicy,是WMS中管理窗口过程中的一个策略类,窗口的显示、事件的派发等都受到PhoneWindowManager中的策略影响。 mWindowManager
和mWindowManagerFuncs
都是WMS对象本身。
2.3.IMS#setWindowManagerCallbacks()设置InputCallback回调
这个方法用来向IMS中设置InputManagerCallback回调:
// frameworks/base/services/core/java/com/android/server/input/InputManagerService.java
public void setWindowManagerCallbacks(WindowManagerCallbacks callbacks)
mWindowManagerCallbacks = callbacks;
InputManagerCallback对象在WMS加载时完成创建:
// frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java
// 创建InputManagerCallback对象
final InputManagerCallback mInputManagerCallback = new InputManagerCallback(this);
public InputManagerCallback getInputManagerCallback()
return mInputManagerCallback;
InputManagerCallback接口用于接受IMS中的回调,如input事件派发过程中发生的ANR等,就是通过该接口向WMS中传递。
2.4.WMS#displayReady()更新DisplayContent配置
这个方法用来进行Display相关配置的第一次更新:
// frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java
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