在主线程中从Firebase Service访问数据 [英] Access data from Firebase Service in main thread

问题描述

我正在编程一个应用程序，该应用程序从FCM消息中接收一些数据，然后根据消息中包含的数据有效载荷更新UI.

I am programming an app that receives some data from a FCM message, then updates the UI based on the data payload contained in the message.

该服务运行良好，并且可以接收数据，但是我无法弄清楚如何将其恢复到我的主要活动中.

The service runs fine, and receives the data, but I cant figure out how to get it back to my main activity.

Firebase服务在我的清单中声明为

The Firebase service is declared in my manifest as

<service android:name=".MyFirebaseService">
   <intent-filter>
       <action android:name="com.google.firebase.MESSAGING_EVENT" />
   </intent-filter>
</service>

在MyFirebaseService类中，我重写了onMessageReceived方法，但是如何通知我的主要活动已收到消息?

In my MyFirebaseService class I have overridden the onMessageReceived method, but how am I supposed to notify my main activity that a message was received?

我可以在Firebase服务中使用处理程序吗?

Is there a handler I can use with the Firebase service?

推荐答案

dev.android.com > Develop > Training > Background Jobs > Reporting Work Status

https://developer.android.com/training /run-background-service/report-status.html

将IntentService中工作请求的状态发送给其他人 组件，首先创建一个Intent，其中包含其状态 扩展数据.

To send the status of a work request in an IntentService to other components, first create an Intent that contains the status in its extended data.

接下来，通过致电发送Intent LocalBroadcastManager.sendBroadcast().这会将Intent发送给任何 您的应用程序中已注册接收该组件的组件.

Next, send the Intent by calling LocalBroadcastManager.sendBroadcast(). This sends the Intent to any component in your application that has registered to receive it.

Intent localIntent = new Intent(BROADCAST_ACTION).putExtra(DATA_STATUS, status);
LocalBroadcastManager.getInstance(this).sendBroadcast(localIntent);

要接收广播Intent对象，请使用的子类 BroadcastReceiver.在子类中，实现 BroadcastReceiver.onReceive()回调方法，其中 LocalBroadcastManager在收到Intent时调用. LocalBroadcastManager将传入的Intent传递给 BroadcastReceiver.onReceive().

To receive broadcast Intent objects, use a subclass of BroadcastReceiver. In the subclass, implement the BroadcastReceiver.onReceive() callback method, which LocalBroadcastManager invokes when it receives an Intent. LocalBroadcastManager passes the incoming Intent to BroadcastReceiver.onReceive().

要向BroadcastReceiver和IntentFilter注册 系统，获取LocalBroadcastManager的实例并调用其 registerReceiver()方法.

To register the BroadcastReceiver and the IntentFilter with the system, get an instance of LocalBroadcastManager and call its registerReceiver() method.

 LocalBroadcastManager.getInstance(this)
     .registerReceiver(mDownloadStateReceiver, statusIntentFilter);

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