android input 事件传递主要流程

1. WindowManagerService

frameworks/base/services/java/com/android/server/WindowManagerService.java

依赖 InputManager mInputManager;
在初始化的时候生成,并mInputManager.start() 启动

2. InputManager

frameworks/base/services/java/com/android/server/InputManager.java

a. new InputManager()

--->nativeInit(mcallbak) //初始化InputManager,并注册输入事件的回调函数

---> android_server_InputManager_nativeInit () // frameworks/base/services/jni/com_android_server_InputManager.cpp

---> NativeInputManager() // frameworks/base/services/jni/com_android_server_InputManager.cpp

---> InputManager() // frameworks/base/libs/ui/InputManager.cpp

----> 初始化DispatcherThread 和 ReaderThread 两个线程

mReaderThread = new InputReaderThread(mReader); // InputReader 循环loop EventHub
mDispatcherThread = new InputDispatcherThread(mDispatcher);

b. InputManager.start()

--- > android_server_InputManager_nativeStart //frameworks/base/services/jni/com_android_server_InputManager.cpp

-->启动DispatcherThread 和 ReaderThread 两个线程

3. InputReader //获取一次event事件

frameworks/base/libs/ui/InputReader.cpp

InputReader::loopOnce()

---> EventHub.getEvent()

4. InputManager.java 的mCallbacks //输入事件的回调处理函数InputManager.Callbacks内部类

InputDispatcher::notifyKey 回调NativeInputManager方法并通过jni 的方式回调InputManager.java 的mCallbacks 进行事件的处理

如：InputDispatcher::notifyKey ----> InputManager.CallbacksinterceptKeyBeforeQueueing()

//frameworks/base/services/jni/com_android_server_InputManager.cpp

5. InputManager.Callbacks内部类

a. 回调WindowManagerService的WindowManagerService.InputMonitor类的方法进行事件的处理.

b. InputMonitor 调用 WindowManagerService的成员mPolicy

c. mPolicy 是WindowManagerPolicy的对象，实际是com.android.internal.policy.impl.Policy 创建出来的PhoneWindowManager

// PhoneWindowManager.java

6. PhoneWindowManager.java

a. interceptKeyBeforeDispatching() home事件的截取

b. interceptKeyBeforeQueueing() power等按键的截取

7. InputReader.cpp

InputReader::process()

---> InputReader::consumeEvent()

---> InputDevice::process()

         ---> KeyboardInputMapper::process() //或者 TrackballInputMapper::process() 或者 TouchInputMapper::process()

           --->KeyboardInputMapper::processKey()

              ----> InputDispatcher::notifyKey()

                 --->WindowManagerPolicy::interceptKeyBeforeQueueing() //即对应6中的，前期对事件的处理

                     InputDispatcher::enqueueInboundEventLocked()

                       ---> mInboundQueue.enqueueAtTail(entry); // 将按键事件添加到InputDispatcher的消息队列中

                            如果队列原来是空的，则唤醒InputDispatcherThread进程

8. InputDispatcherThread

-->InputDispatcher::dispatchOnce()

   --> InputDispatcher::dispatchOnceInnerLocked()

      --> InputDispatcher::dispatchKeyLocked()

        --> InputDispatcher::findFocusedWindowTargetsLocked()

            InputDispatcher::dispatchEventToCurrentInputTargetsLocked()

             --> InputDispatcher::prepareDispatchCycleLocked()

                 -->InputDispatcher::startDispatchCycleLocked()

                    --> InputPublisher::publishKeyEvent()

                        --> NativeInputQueue::handleReceiveCallback

                            --> java 层的InputQueue的dispatchKeyEvent() 方法

                               --> ViewRoot的dispatchKeyEvent() 方法

参考：

http://blog.csdn.net/yuleslie/article/details/7079448

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