android手机中power键按下后控制着屏幕的唤醒与休眠,可以说是最重要的按键。它的运转流程跟以下几个文件有关
InputDispatcher.cpp
void InputDispatcher::notifyKey(const NotifyKeyArgs* args)
com_android_server_input_InputManagerService.cpp
void NativeInputManager::interceptKeyBeforeQueueing(const KeyEvent* keyEvent,
uint32_t& policyFlags)
void NativeInputManager::handleInterceptActions(jint wmActions, nsecs_t when,
uint32_t& policyFlags)
PhoneWindowManager.java
public int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags, boolean isScreenOn)
com_android_server_power_PowerManagerService.cpp
void android_server_PowerManagerService_goToSleep(nsecs_t eventTime)
void android_server_PowerManagerService_wakeUp(nsecs_t eventTime)
PowerManagerService.java.
private void wakeUpFromNative(long eventTime)
private void goToSleepFromNative(long eventTime, int reason)
按以上排列的顺序一路走下来,然后在PowerManagerService中设置相关标志位,开关屏幕