BroadcastReceiver 动态注册注意事项

1、注册，但没有发送广播

IntentFilter filter=new IntentFilter("asdfasdfasdf");
registerReceiver(new MyBroadCast(), filter);
 2、发送广播      
Intent intent=new Intent("asdfasdfasdf");
sendBroadcast(intent);

class MyBroadCast extends BroadcastReceiver{

        private static final String TAG = "BroadCastTest";

        @Override
        public void onReceive(Context arg0, Intent arg1) {
            Log.i(TAG,"------asdfasdfadsf");
            Toast.makeText(arg0, arg1.getAction(),Toast.LENGTH_LONG).show();
        }
        
    }