android - 监听广播接收器的 Activity

Question

所以我有在启动时开始的广播接收器。我有一个使用广播接收器收集的信息的 Activity 。我希望 Activity 能够在每次调用广播接收器时更新其回收器 View ，问题是该 Activity 没有引用广播接收器。有没有办法让我的 Activity 收听广播并自行更新？

我唯一能想到的就是让 Activity 运行一个重复任务，尝试用新信息更新自身。这对我来说似乎不是一个好的解决方案。

Answer 1

最好的方法是注册一个BroadcastReceiver - 参见documentation on this .在您的情况下，您想要 Programmatically register a broadcast receiver这样 onReceive(Context context, Intent intent) 来自 Activity 类。这样，您就可以根据需要更新 Recyclerview。像这样的东西:

public void onCreate(Bundle savedInstanceState){
  ...
  IntentFilter filter = new IntentFilter();
  //you may want to set whatever filters here...
  //define the broadcast receiver
  receiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
      //here you can update the RecyclerView as you desire using intent's data
    }
  };
     //register the broadcast receiver
     registerReceiver(receiver, filter);
}

我强烈建议您阅读这个不错的 BroadcastReceiver tutorial .

享受吧。