Main Process of Android input event Transfer

1. windowmanagerservice

Frameworks/base/services/Java/COM/Android/Server/windowmanagerservice. Java

Dependent on inputmanager minputmanager;
Generated during initialization and started with minputmanager. Start ()

 

2. inputmanager

Frameworks/base/services/Java/COM/Android/Server/inputmanager. Java

A. New inputmanager ()

---> Nativeinit (mcallbak) // initializes inputmanager and registers the callback function for the input event.

---> 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

----> Initialize dispatcherthread and readerthread.

Mreaderthread = new inputreaderthread (mreader); // inputreader loop eventhub
Mdispatcherthread = new inputdispatcherthread (mdispatcher );

 

B. inputmanager. Start ()

---> Android_server_inputmanager_nativestart // frameworks/base/services/JNI/com_android_server_inputmanager.cpp

--> Start dispatcherthread and readerthread.

 

3. inputreader // gets an event

Frameworks/base/libs/UI/inputreader. cpp

Inputreader: looponce ()

---> Eventhub. getevent ()

 

4. inputmanager. Java's mcallbacks // callback handler for input events inputmanager. Callbacks internal class

Inputdispatcher: notifykey callback nativeinputmanager method and callback inputmanager. Java mcallbacks through JNI for event processing

For example, inputdispatcher: policykey ----> inputmanager. callbacksinterceptkeybeforequeueing ()

// Frameworks/base/services/JNI/com_android_server_inputmanager.cpp

 

5. inputmanager. Callbacks internal class

A. Call back the windowmanagerservice. inputmonitor class method of windowmanagerservice to process events.

B. inputmonitor calls the mpolicy member of windowmanagerservice.

C. mpolicy is the object of windowmanagerpolicy. It is actually the phonewindowmanager created by com. Android. Internal. Policy. impl. Policy.

// Phonewindowmanager. Java

 

6. phonewindowmanager. Java

A. interceptkeybeforedispatching () Home event Interception

B. interceptkeybeforequeueing () Power

 

7. inputreader. cpp

Inputreader: Process ()

---> Inputreader: consumeevent ()

---> Inputdevice: Process ()

---> Keyboardinputmapper: Process () // or trackballinputmapper: Process () or touchinputmapper: Process ()

           --->KeyboardInputMapper::processKey()

              ----> InputDispatcher::notifyKey()

---> Windowmanagerpolicy: interceptkeybeforequeueing () // corresponds to the event processing in the early stage of table 6.

                     InputDispatcher::enqueueInboundEventLocked()

---> Minboundqueue. enqueueattail (entry); // Add the key event to the inputdispatcher message queue.

If the queue is empty, wake up the inputdispatcherthread process.

8. InputDispatcherThread

-->InputDispatcher::dispatchOnce()    

   --> InputDispatcher::dispatchOnceInnerLocked()

      --> InputDispatcher::dispatchKeyLocked()

        --> InputDispatcher::findFocusedWindowTargetsLocked()

            InputDispatcher::dispatchEventToCurrentInputTargetsLocked()

             --> InputDispatcher::prepareDispatchCycleLocked()

                 -->InputDispatcher::startDispatchCycleLocked()

                    --> InputPublisher::publishKeyEvent()      

                        --> NativeInputQueue::handleReceiveCallback

--> The dispatchkeyevent () method of inputqueue at the Java Layer

--> Dispatchkeyevent () method of viewroot

Refer:

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