Home key点亮屏幕后, 使手机不自动回到 launcher 界面

1: 修改 phonewindowmanager.java 中 interceptKeyBeforeQueueing 方法的下面这段 code:
 if (keyCode == KeyEvent.KEYCODE_POWER) {
             policyFlags |= WindowManagerPolicy.FLAG_WAKE;
         } 
改为:
if (keyCode == KeyEvent.KEYCODE_POWER || (keyCode == KeyEvent.KEYCODE_HOME && !isScreenOn)) {
            policyFlags |= WindowManagerPolicy.FLAG_WAKE;
} 

 
2: 仍然是此方法,对应部分修改为如下:
        int result; //参考行
  
        if (((isScreenOn && !mHeadless) || (isInjected && !isWakeKey))) {//参考行
            // When the screen is on or if the key is injected pass the key to the application.
             Log.d(TAG,"oldScreenOn = "+oldScreenOn); 
             if(!oldScreenOn && (keyCode == KeyEvent.KEYCODE_HOME)){  
                 Log.d(TAG,"eat the home up because home down has dropped");
                 result |= ACTION_WAKE_UP;
             }else{
                result = ACTION_PASS_TO_USER;
            }
        } else {
            // When the screen is off and the key is not injected, determine whether
            // to wake the device but don't pass the key to the application.
            result = 0;
            if (down && isWakeKey && isWakeKeyWhenScreenOff(keyCode)) {
                if (keyguardActive) {
                    // If the keyguard is showing, let it wake the device when ready.
                    mKeyguardMediator.onWakeKeyWhenKeyguardShowingTq(keyCode);
                } else {
                    // Otherwise, wake the device ourselves.
                    result |= ACTION_WAKE_UP;
                }
            }
        }
 
        oldScreenOn = isScreenOn; 
 

 
 
其中的 oldScreenOn 请定义在 phoneWindowManager 这个 class 中, 如下:
boolean oldScreenOn = true;