长按power key的流程分析

本文是对长按power key的源码进行分析。

1. power key 事件的注册
   <—-PhoneWindowManager.java—>
   在该函数中对power key长按事件进行注册：
   private class PolicyHandler extends Handler{
   ………
   case MSG_POWER_LONG_PRESS:
   powerLongPress();
   break;
   ……….
   }

2. 长按事件都做了什么
   at com.android.internal.policy.impl.GlobalActions.createDialog(GlobalActions.java:239)
   at com.android.internal.policy.impl.GlobalActions.handleShow(GlobalActions.java:211)
   at com.android.internal.policy.impl.GlobalActions.showDialog(GlobalActions.java:193)
   at com.android.internal.policy.impl.PhoneWindowManager.showGlobalActionsInternal(PhoneWindowManager.java:1239)
   at com.android.internal.policy.impl.PhoneWindowManager.powerLongPress(PhoneWindowManager.java:1157)
   at com.android.internal.policy.impl.PhoneWindowManager.access$800(PhoneWindowManager.java:157) at com.android.internal.policy.impl.PhoneWindowManager$PolicyHandler.handleMessage(PhoneWindowManager.java:736)
   at android.os.Handler.dispatchMessage(Handler.java:111)
   at android.os.Looper.loop(Looper.java:194)
   at android.os.HandlerThread.run(HandlerThread.java:61)
   at com.android.server.ServiceThread.run(ServiceThread.java:46)