屏幕解锁加锁的监听

监听屏幕SCREEN_ON和SCREEN_OFF这两个action,实现屏幕锁定状态的监听，从而实现自己的锁屏效果，奇怪的是，这两个action只能通过代码的形式注册，才能被监听到，使用AndroidManifest.xml 完全监听不到。查了一下，发现这是PowerManager那边在发这个广播的时候，做了限制，限制只能有register到代码中的receiver才能接收。

 private void registerScreenActionReceiver(){
     final IntentFilter filter = new IntentFilter();
     filter.addAction(Intent.ACTION_SCREEN_OFF);
     filter.addAction(Intent.ACTION_SCREEN_ON);
     registerReceiver(receiver, filter);
 }

 private final BroadcastReceiver receiver = new BroadcastReceiver(){

     @Override
     public void onReceive(final Context context, final Intent intent) {
         // Do your action here

     }

 };