Question

我正在将firebase FCM推送通知集成到一个Android应用程序上，并且一切正常，除非应用程序在后台/被杀死，否则不会调用 MyFirebaseMessagingService 。当应用程序处于前台时，它可以正常工作。当应用程序在后台运行时，完全不会调用 onMessageReceived（）。我只想一次从 Firebase控制台UI 向所有订阅者发送推送通知，而不是尝试进行1-1消息传递或通过Web服务器发送。不是从“最近使用的应用程序”托盘中关闭应用程序时该服务未运行，而是仅当该应用程序进入后台时该应用程序根本无法运行。

下面是相应的代码：

MyFirebaseMessagingService

public class MyFirebaseMessagingService extends FirebaseMessagingService {

private static final String TAG = "MyFirebaseMsgService";

/**
 * Called when message is received.
 *
 * @param remoteMessage Object representing the message received from Firebase Cloud Messaging.
 */
// [START receive_message]



@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    // TODO(developer): Handle FCM messages here.
    // Not getting messages here? See why this may be:
    Log.d(TAG, "From: " + remoteMessage.getFrom());

    // Check if message contains a data payload.
    if (remoteMessage.getData().size() > 0) {
        Log.d(TAG, "Message data payload: " + remoteMessage.getData());

        if (/* Check if data needs to be processed by long running job */ true) {
            // For long-running tasks (10 seconds or more) use Firebase Job Dispatcher.
            scheduleJob();
        } else {
            // Handle message within 10 seconds
            handleNow();
        }

    }

    // Check if message contains a notification payload.
    if (remoteMessage.getNotification() != null) {
        Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
    }

    // Also if you intend on generating your own notifications as a result of a received FCM
    // message, here is where that should be initiated. See sendNotification method below.
}

清单中的服务声明

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

应用程序类声明

FirebaseMessaging.getInstance().subscribeToTopic("weather")
            .addOnCompleteListener(new OnCompleteListener<Void>() {
                @Override
                public void onComplete(@NonNull Task<Void> task) {
                    String msg = "Subscribed";
                    if (!task.isSuccessful()) {
                        msg = "Message";
                    }
                    Log.d("Token", msg);
                    Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_SHORT).show();
                }
            });

当应用处于后台/已终止运行时，Firebase FCM无法调用服务

0 个答案: