Activity里接收不到广播是怎么回事

1.Activity注册动态广播和销毁广播

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    registerExitAppReceiver();
}

public void registerExitAppReceiver() {
    IntentFilter exitFilter = new IntentFilter();
    exitFilter.addAction(ProtocalConstants.MESSAGE_EXIT_APP);
    registerReceiver(exitReceiver, exitFilter);
}

private ExitAppReciver exitReceiver= new ExitAppReciver();

@Override
protected void onDestroy() {
    super.onDestroy();
    unregisterReceiver(exitReceiver);

}

2.广播接收器

public class ExitAppReciver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        if (context != null) {
            if (context instanceof Activity) {
                ((Activity) context).finish();
            } else if (context instanceof FragmentActivity) {
                ((FragmentActivity) context).finish();
            } else if (context instanceof Service) {
                ((Service) context).stopSelf();
            }
        }
    }
}

3.发送广播

LocalBroadcastManager.getInstance(context).sendBroadcast(intentBroad); 

这样发送是接受接收器收不到广播的。这种发送广播的方式接收是

LocalBroadcastManager.getInstance(context).registerReceiver(exitReceiver, exitFilter);

需要这样发送sendBroadcast(intentBroad);反之LocalBroadcastManager.getInstance(context).registerReceiver(exitReceiver, exitFilter)；注册的广播 

这样发送sendBroadcast(intentBroad)也是收不到的