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Android 系统按键拦截核心方法

代码位置：

frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java# interceptKeyBeforeQueueing@OverridepublicintinterceptKeyBeforeQueueing(KeyEventevent,intpolicyFlags){finalintkeyCode=event.getKeyCode();finalbooleandown=event.getAction()==KeyEvent.ACTION_DOWN;booleanisWakeKey=(policyFlags&WindowManagerPolicy.FLAG_WAKE)!=0||event.isWakeKey();booleanisKeyGestureTriggered=(policyFlags&FLAG_KEY_GESTURE_TRIGGERED)!=0;// There are key events that perform the operation as the current user,// and these should be ignored for visible background users.if(mVisibleBackgroundUsersEnabled&&!KeyEvent.isVisibleBackgroundUserAllowedKey(keyCode)&&!isKeyEventForCurrentUser(event.getDisplayId(),keyCode,null)){return0;}//客制化修改屏蔽按键if((keyCode==KeyEvent.KEYCODE_VOLUME_UP||keyCode==KeyEvent.KEYCODE_VOLUME_DOWN||keyCode==KeyEvent.KEYCODE_VOLUME_MUTE||keyCode==KeyEvent.KEYCODE_SETTINGS||keyCode==KeyEvent.KEYCODE_HOME)){return0;}//客制化修改屏蔽按键......}

这是Android 系统输入管理核心类PhoneWindowManager中最关键的方法之一 。作用是：在按键事件加入系统事件队列之前，由系统框架层统一拦截、处理、决定按键的最终流向。它是系统级按键策略的总入口， 所有物理按键（电源、音量、返回、通话、电视按键等）都会先经过这里，再决定是否交给应用处理。

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