10.10 android输入系统_APP获得并处理输入事件流程

APP对fd/InputChannel的注册过程:

new WindowInputEventReceiver extends InputEventReceiver//InputEventReceiver类的dispatchInputEvent函数会调用onInputEvent

  onInputEvent函数在收到事件后被调用//被父类的dispatchInputEvent调用

在InputEventReceiver的构造函数中调用nativeInit

nativeInit//从java进入C++

  new NativeInputEventReceiver

    consumeEvents//调用Java层的函数dispatchInputEvent

      dispatchInputEvent

最后会把fd加入epoll去监控

APP获得并处理输入事件流程

pollOnce

 polInner

  epoll_wait//等待各种事件的发生

  pushResponse(events,mRequests.valueAt(requestIndex))构造response放入某个缓冲区

  Response& response = mResponses.editItemAt(i)//从缓冲取出response

  int callbackResult = response.request.callback->handleEvent(fd,events,data)

   consumeEvents(env,false,-1,NULL)

    mInputConsumer.consume(...,&seq,&inputEvent)

     mChannel->receiveMessage(&mMsg)

      nRead = ::recv(mFD,msg,sizeof(InputMessage),MSG_DONTWAIT)

     initializeKeyEvent(keyEvent,&mMsg)

     *outSeq = mMsg.body.key.seq

     *outEvent = keyEvent 

    inputEventObj = android_view_KeyEvent_fromNative(env,static_cast<KeyEvent*>(inputEvent))

    env->CallVoidMethod(receiverObj.get(),gInputEventReceivrrClassInfo.dispatchInputEvent,seq,inputEventObj)

     onInputEvent(event)

      enqueueInputEvent(event,this,0,true)

       mPendingInputEventTail =q

       doProcessInputEvents//处理众多的输入事件

        QueueInputEvent q = mPendingInputEventHead;

        mPendingInputEventHead = q.mNext

        deliverInputEvent(q)

         stage = q.shouldSkipIme()?mFirstPostImeInputStage:mFirstInputStage;//如果应用程序使用输入法,就从mFirstInputStage开始处理,如果不使用输入法,就从mFirstPostImeInputStage开始处理

         stage.deliver(q)

InputStage stage的分析见下图   

如果应用程序使用输入法,就从mFirstInputStage开始处理,如果不使用输入法,就从mFirstPostImeInputStage开始处理

 

  

posted on 2018-06-11 19:57  拉风摊主  阅读(292)  评论(0编辑  收藏  举报

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