1.Android 4.0 用户输入子系统代码模块
frameworks/base/services/java/com/android/server/SystemServer.java
frameworks/base/services/java/com/android/server/wm/WindowManagerService.java
frameworks/base/services/java/com/android/server/wm/InputManager.java
frameworks/base/services/jni/com_android_server_InputManager.cpp
frameworks/base/services/input/Android.mk
frameworks/base/services/input/EventHub.cpp
frameworks/base/services/input/EventHub.h
frameworks/base/services/input/InputApplication.cpp
frameworks/base/services/input/InputDispatcher.cpp
frameworks/base/services/input/InputListener.cpp
frameworks/base/services/input/InputDispatcher.h
frameworks/base/services/input/InputListener.h
frameworks/base/services/input/InputManager.cpp
frameworks/base/services/input/InputManager.h
frameworks/base/services/input/InputReader.cpp
frameworks/base/services/input/InputReader.h
frameworks/base/services/input/InputWindow.cpp
frameworks/base/services/input/InputWindow.h
frameworks/base/services/input/PointerController.cpp
frameworks/base/services/input/PointerController.h
frameworks/base/services/input/SpriteController.cpp

frameworks/base/services/input/SpriteController.h

2.Service and WindowManagerService

[java] view plain copy

1. Sourcecode:frameworks/base/services/java/com/android/server/SystemServer.java
2. classServerThreadextendsThread{
3. privatestaticfinalStringTAG="SystemServer";
5. /*。。。。。。。。。。处略过若干行。。。。。。。。。*/
6. Slog.i(TAG,"WindowManager");
7. wm=WindowManagerService.main(context,power,
8. factoryTest!=SystemServer.FACTORY_TEST_LOW_LEVEL,
9. !firstBoot);
10. ServiceManager.addService(Context.WINDOW_SERVICE,wm);
12. ActivityManagerService.self().setWindowManager(wm);
14. }

功能描述：系统启动过程通过SystemServer添加WindowManagerService到服务列表

--WindowManagerService的构造方法

[java] view plain copy

1. Sourcecode:frameworks/base/services/java/com/android/server/wm/WindowManagerService.java
2. privateWindowManagerService(Contextcontext,PowerManagerServicepm,
3. booleanhaveInputMethods,booleanshowBootMsgs){
5. mInputManager=newInputManager(context,this);/*构造InputManager*/
7. PolicyThreadthr=newPolicyThread(mPolicy,this,context,pm);
8. thr.start();
9. /*debugbyJoyce*/
10. synchronized(thr){
11. while(!thr.mRunning){
12. try{
13. thr.wait();
14. }catch(InterruptedExceptione){
15. }
16. }
17. }
18. mInputManager.start();/*启动InputManager*/
19. }

功能描述：1)初始化并构造一个InputManager实例mInputManager
2)开启InputManager(由InputManager本身start()方法实现)

--InputManager构造方法以及start()方法的实现

[java] view plain copy

1. Sourcecode:frameworks/base/services/java/com/android/server/wm/InputManager.java
2. publicInputManager(Contextcontext,WindowManagerServicewindowManagerService){
3. this.mContext=context;
4. this.mWindowManagerService=windowManagerService;
5. this.mCallbacks=newCallbacks();
6. /*现在知道为何与WindowManagerService有关系了吧
7. *因为InputManager的各种需求
8. */
9. /*获取Looper循环队列?说实话我已经忘记了,只不过还记得那一副经典的图*/
10. Looperlooper=windowManagerService.mH.getLooper();
11. Slog.i(TAG,"Initializinginputmanager");
13. nativeInit(mContext,mCallbacks,looper.getQueue());/*初始化InputManager*/
14. }
15. /*debugbyJoyce*/
16. publicvoidstart(){
17. Slog.i(TAG,"HeyJoyceStartinginputmanager");
19. nativeStart();/*启动InputManager的本地实现*/
21. }
22. }

功能描述：1)调用JNI本地框架中的nativeInit方法来初始化InputManager
2)调用JNI本地框架中的nativeStart方法来开启InputManager

3.JNI本地框架的实现
--com_android_server_InputManager中给上层InputManager所提供的两个本地AP的实现

------------------>A部分[java] view plain copy

1. Sourcecode:frameworks/base/services/jni/com_android_server_InputManager.cpp
2. /*方法映射表*/
3. staticJNINativeMethodgInputManagerMethods[]={
4. /*name,signature,funcPtr*/
5. {"nativeInit","(Landroid/content/Context;"
6. "Lcom/android/server/wm/InputManager$Callbacks;Landroid/os/MessageQueue;)V",
7. (void*)android_server_InputManager_nativeInit},
8. {"nativeStart","()V",
9. (void*)android_server_InputManager_nativeStart},
10. }
12. staticvoidandroid_server_InputManager_nativeInit(JNIEnv*env,jclassclazz,
13. jobjectcontextObj,jobjectcallbacksObj,jobjectmessageQueueObj){
14. if(gNativeInputManager==NULL){/*首次调用肯定为NULL*/
15. sp<Looper>looper=android_os_MessageQueue_getLooper(env,messageQueueObj);
16. gNativeInputManager=newNativeInputManager(contextObj,callbacksObj,looper);
17. }else{
18. LOGE("Inputmanageralreadyinitialized.");
19. jniThrowRuntimeException(env,"Inputmanageralreadyinitialized.");
20. }
21. }
23. --NativeInputManager本地类的构造函数
24. NativeInputManager::NativeInputManager(jobjectcontextObj,
25. jobjectcallbacksObj,constsp<Looper>&looper):
26. mLooper(looper){
27. JNIEnv*env=jniEnv();
28. /*程序到这里就已经为我们创建一个inputdeviceHAL的实例了*/
29. sp<EventHub>eventHub=newEventHub();/*creattheEventHub一系列的memset*/
30. /*并以eventHub为参数为我们创建了一个InputManager本地实例,注意这个InputManager
31. 是上层InputManager的本地实现定义在InputManager.cpp中
32. */
33. mInputManager=newInputManager(eventHub,this,this);
34. }
35. --InputManager构造函数的实现
36. Sourcecode：frameworks/base/services/input/InputManager.cpp
37. InputManager::InputManager(
38. constsp<EventHubInterface>&eventHub,
39. constsp<InputReaderPolicyInterface>&readerPolicy,
40. constsp<InputDispatcherPolicyInterface>&dispatcherPolicy){
41. mDispatcher=newInputDispatcher(dispatcherPolicy);
42. mReader=newInputReader(eventHub,readerPolicy,mDispatcher);
43. initialize();
44. }

功能描述：1)创建NativeInputManager对象并保存成gNativeInputManager,该变量马上就会被用到
2)创建NativeInputManager对象的同时创建EventHub对象，并将创建的EventHub对象mEventHub作为参数传递给InputManager
的构造函数创建InputManager对象mInputManager
3)构建InputManager的同时会为我们构建InputDispatcher和InputReader对象
4)好了其实到这里就已经进入了本地C++框架层了,先到此打住,把下面这个JNI方法先分析一番

------------------>B部分

[java] view plain copy

1. staticvoidandroid_server_InputManager_nativeStart(JNIEnv*env,jclassclazz){
2. if(checkInputManagerUnitialized(env)){
3. return;
4. }
6. status_tresult=gNativeInputManager->getInputManager()->start();
7. if(result){
8. jniThrowRuntimeException(env,"Inputmanagercouldnotbestarted.");
9. }
10. }

功能描述：1)很简单直接调用上面初始化过程中创建的NativeInputManager对象mNativeInputManager去调用getInputManager()函数,该函数又刚好返回InputManager对象mInputManager了
2)再由mInputManager去调用它本身的start()方法来启动InputManager
3)从上面的这些方法可以得知在上层我们开启InputManager实质是开启了本地C++框架中的InputManager
4.C++Input框架的实现

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