1、FWK层中AIDL形式

Android 接口定义语言 (AIDL)、Android 应用层到 HAL 层

AIDL形式是Android中binder机制的具体实现。按照规范aidl/hidl文件自动生成相应代码文件：
客户端获取proxy：asInterface(android.os.IBinder obj)
服务端实现Stub：class Stub extends android.os.Binder

1.1 服务端实现Stub

WindowManagerService继承IWindowManager.Stub，SystemServer.java中服务初始化添加到ServiceManager中

frameworks/base/services/java/com/android/server/SystemServer.java
在这里插入图片描述

frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java
在这里插入图片描述

frameworks/base/core/java/android/view/IWindowManager.aidl

1.2 客户端获取proxy

应用端获取服务getSystemService(Context.INPUT_SERVICE))，这里通过中getWindowManagerService()方法操作IWindowManager.Stub.asInterface(ServiceManager.getService("window"))
直接获取IWindowManager.Stub.asInterface(ServiceManager.getService(Context.WINDOW_SERVICE))

frameworks/base/core/java/android/app/SystemServiceRegistry.java

registerService(Context.WINDOW_SERVICE, WindowManager.class,new CachedServiceFetcher<WindowManager>() {@Overridepublic WindowManager createService(ContextImpl ctx) {return new WindowManagerImpl(ctx);}});

frameworks/base/core/java/android/view/WindowManagerGlobal.java

@UnsupportedAppUsage
public static IWindowManager getWindowManagerService() {synchronized (WindowManagerGlobal.class) {if (sWindowManagerService == null) {sWindowManagerService = IWindowManager.Stub.asInterface(ServiceManager.getService("window"));try {if (sWindowManagerService != null) {ValueAnimator.setDurationScale(sWindowManagerService.getCurrentAnimatorScale());sUseBLASTAdapter = sWindowManagerService.useBLAST();}} catch (RemoteException e) {throw e.rethrowFromSystemServer();}}return sWindowManagerService;}
}