从服务的Andr​​oid更新活动的用户界面 [英] Android update activity UI from service

问题描述

我有被检查新任务的全部时间的服务。如果有新的任务，我想刷新活动的用户界面，显示该信息。 我的确发现<一href="https://github.com/commonsguy/cw-andtutorials/tree/master/18-LocalService/">https://github.com/commonsguy/cw-andtutorials/tree/master/18-LocalService/这个例子。这是一个好approch？任何其他的例子吗？

I have a service which is checking for new task all the time. If there is new task, I want to refresh the activity UI to show that info. I did find https://github.com/commonsguy/cw-andtutorials/tree/master/18-LocalService/ this example. Is that a good approch ? Any other examples?

感谢。

推荐答案

在您的服务：（使用COPA如下面的例子中服务）

In your service: (using COPA as service in example below).

使用一个LocalBroadCastManager。在您服务的onCreate，成立了广播：

Use a LocalBroadCastManager. In your service's onCreate, set up the broadcaster:

broadcaster = LocalBroadcastManager.getInstance(this);

当你要通知一些用户界面：

When you want to notify the UI of something:

static final public String COPA_RESULT = "com.controlj.copame.backend.COPAService.REQUEST_PROCESSED";

static final public String COPA_MESSAGE = "com.controlj.copame.backend.COPAService.COPA_MSG";

public void sendResult(String message) {
    Intent intent = new Intent(COPA_RESULT);
    if(message != null)
        intent.putExtra(COPA_MESSAGE, message);
    broadcaster.sendBroadcast(intent);
}

在活动：

上的onCreate创建一个监听器：

Create a listener on onCreate:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    super.setContentView(R.layout.copa);
    receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String s = intent.getStringExtra(COPAService.COPA_MESSAGE);
            // do something here.
        }
    };
}

和在ONSTART注册：

and register it in onStart:

@Override
protected void onStart() {
    super.onStart();
    LocalBroadcastManager.getInstance(this).registerReceiver((receiver), 
        new IntentFilter(COPAService.COPA_RESULT)
    );
}

@Override
protected void onStop() {
    LocalBroadcastManager.getInstance(this).unregisterReceiver(receiver);
    super.onStop();
}

这篇关于从服务的Andr​​oid更新活动的用户界面的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！