Android PhoneWindowManager拦截事件流程分析

PhoneWindowManager初始化

wms::wms
    wms::initPolicy
        UiThread::Handler::runWithScissors
            PhoneWindowManager::init

interceptKeyBeforeQueueing 调用栈

InputDispatcher::injectInputEvent // 触发调用1
InputDispatcher::notifyKey // 触发调用2
    com_android_server_input_InputManagerService::NativeInputManager::interceptKeyBeforeQueueing
        IMS::WindowManagerCallbacks::interceptKeyBeforeQueueing // InputMontor是WindowManagerCallbacks的实现类
            InputMontor::interceptKeyBeforeQueueing
                WMS::PhoneWindowManager::interceptKeyBeforeQueueing

interceptKeyBeforeDispatching调用栈

InputDispatcher::dispatchOnce
    InputDispatcher::dispatchOnceInnerLocked(
        //InputDispatcher::mPolicy // mPolicy:: com_android_server_input_InputManagerService.cpp
        InputDispatcher::dispatchKeyLocked
            InputDispatcher::doInterceptKeyBeforeDispatchingLockedInterruptible
                com_android_server_input_InputManagerService::NativeInputManager::interceptKeyBeforeDispatching
                // jni InputManagerService::nativeInit中初始化
                    IMS::WindowManagerCallbacks::interceptKeyBeforeDispatching // InputMontor是WindowManagerCallbacks的实现类
                        InputMontor::interceptKeyBeforeDispatching
                            WMS::PhoneWindowManager::interceptKeyBeforeDispatching

PhoneWindowManager 相关类图

PhoneWindowManager.png

1. InputMonitor 实现IMS::WindowManagerCallbacks接口，并且持有WMS引用；
2. WMS持有WindowManagerPolicy接口的实现类PhoneWindowManager；
3. PhoneWindowManager的内部类PolicyHandler分发业务逻辑；
4. PhoneWindowManager的初始化在android.ui 线程；