活动和粘滞服务之间的交互 [英] Interaction between Activity and Sticky Service

问题描述

我有一个活动和置顶服务。该活动需要在it's的UserInterface表现出一定的值取决于置顶服务的价值。因此，每当服务改变了他的数据，该活动需要更新it's的UserInterface。 但如何在服务通知活动以改变it's价值观

i have an Activity and a Sticky Service. The Activity needs to show some values in it´s UserInterface depending on the values of the Sticky Service. So whenever the Service changes his data, the Activity needs to update it´s UserInterface. But how should the Service notify the Activity to change it´s values??

请提醒的是，活动有时isn't活着，只有服务的粘性。

Please remind that the Activity sometimes isn´t alive, only the Service is Sticky.

推荐答案

使用LocalBroadcasts

Use LocalBroadcasts

在服务类：

public class LocalMessage extends IntentService{
    private Intent broadcast;
    public static final String BROADCAST = "LocalMessage.BROADCAST";
    public LocalMessage(String name) {
        super(name);
        broadcast = new Intent(name);
    }

@Override
    protected void onHandleIntent(Intent intent) {
        if (broadcast != null) LocalBroadcastManager.getInstance(context).sendBroadcast(broadcast);
    }
}

这里是方法内部服务广播

and here is method inside service to broadcast

private void sendLocalMessage(){
    (new LocalMessage(LocalMessage.BROADCAST)).onHandleIntent(null);
}

在你的活动：

    private void registerBroadcastReciever() {
        IntentFilter filter = new IntentFilter(YourService.LocalMessage.BROADCAST);
        LocalBroadcastManager.getInstance(getApplicationContext()).registerReceiver(receiver, filter);
    } 
    private BroadcastReceiver receiver = new BroadcastReceiver() {

            @Override
            public void onReceive(Context context, Intent intent) {
//doSmth
                }
            };

在您的活动的onDestroy（）方法注销接收器;

in your activity onDestroy() method unregister receiver;

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