我怎么可以通知从广播接收器正在运行的活动？ [英] how can I notify a running activity from a broadcast receiver?

问题描述

我有一个活动，它需要响应于广播事件。 因为一个活动不能是一个广播接收器的同时， 我做了一个广播接收器。

I have an activity, it needs to response to a broadcast event. Since an activity can not be a broadcast receiver at the same time, I made a broadcast receiver.

我的问题是：我怎样才能从广播接收通知的活动？ 我相信这是一个常见的​​情况，所以有一个设计模式呢？

My question is: how can I notify the activity from the broadcast receiver? I believe this is a common situation, so is there a design pattern for this?

推荐答案

广播的通知。 :)如果你想说，开始一项活动或提供的服务等的基础上接收到的广播，那么你需要一个独立的广播接收器和你把你的清单文件。但是，如果你希望你的活动本身来响应广播，那么你创建你的活动广播接收机的一个实例并注册它。

The broadcast is the notification. :) If you want to say, start an activity or a service, etc., based on a received broadcast then you need a standalone broadcast receiver and you put that in your manifest file. However, if you want your activity itself to respond to broadcasts then you create an instance of a broadcast receiver in your activity and register it there.

我使用的模式是：

public class MyActivity extends Activity {
    private BroadcastReceiver receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(...) {
            ...
        }
   });

    public void onResume() {
        super.onResume();

        IntentFilter filter = new IntentFilter();
        filter.addAction(BROADCAST_ACTION);

        this.registerReceiver(this.receiver, filter);
    }

    public void onPause() {
        super.onPause();

        this.unregisterReceiver(this.receiver);
    }
}

那么，这样上课的时候​​被创建（也可以做的onCreate）接收器被实例化。然后在onResume /的onPause我处理注册和注销的接收器。然后在reciever的的onReceive 方法，我做的一切必要措施使活动的反应我想，当它接收广播的方式。

So, this way the receiver is instantiated when the class is created (could also do in onCreate). Then in the onResume/onPause I handle registering and unregistering the receiver. Then in the reciever's onReceive method I do whatever is necessary to make the activity react the way I want to when it receives the broadcast.

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