当活动处于后台或不在后台时，Firebase 通知不起作用

我的编码与 firebase 示例代码提供的相同。当 Activity 处于前台状态或打开时，它可以正常工作。但是，当活动关闭或处于后台状态时，它就无法正常工作。问题是这样的...

1. 不显示应用程序的应用程序图标。

2. 默认情况下以应用程序名称作为通知标题

当应用程序处于后台状态或未在设备上打开时，会发生时间通知，LogCat 将显示以下详细信息：

09-16 15:55:56.056 12113-12113/com.testdemofb D/FirebaseApp: com.google.firebase.auth.FirebaseAuth is not linked. Skipping initialization.
09-16 15:55:56.089 12113-12113/com.testdemofb D/FirebaseApp: com.google.firebase.crash.FirebaseCrash is not linked. Skipping initialization.
09-16 15:55:56.176 12113-12113/com.testdemofb I/FA: App measurement is starting up, version: 9452
09-16 15:55:56.177 12113-12113/com.testdemofb I/FA: To enable debug logging run: adb shell setprop log.tag.FA VERBOSE
09-16 15:55:56.286 12113-12113/com.testdemofb I/FirebaseInitProvider: FirebaseApp initialization successful
09-16 15:55:56.518 12113-12147/com.testdemofb I/FA: Tag Manager is not found and thus will not be used

如果有任何解决方案，请帮助我

谢谢...

MyFirebaseMessagingService.java

package com.testdemofb;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.media.RingtoneManager;
import android.net.Uri;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
import android.widget.Toast;

import com.google.firebase.messaging.FirebaseMessagingService;
import com.google.firebase.messaging.RemoteMessage;

public class MyFirebaseMessagingService extends FirebaseMessagingService {

private static final String TAG = "MyFirebaseMsgService";


@Override
public void onMessageReceived(RemoteMessage remoteMessage) {

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

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


}

private void sendNotification(String messageBody) {
    Intent intent = new Intent(this, MainActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
            PendingIntent.FLAG_ONE_SHOT);

    Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
    Bitmap bm = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher);
    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
            .setLargeIcon(bm)
            .setSmallIcon(R.mipmap.ic_launcher)
            .setContentTitle("Title")
            .setContentText(messageBody)
            .setAutoCancel(true)
            .setSound(defaultSoundUri)
            .setContentIntent(pendingIntent);

    NotificationManager notificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

    notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());

}
}

AndroidManifest.xml 文件像这样放在之间应用 tag...

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

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

FCM 使用两种类型的消息，即。通知和数据。了解更多相关信息here https://firebase.google.com/docs/cloud-messaging/concept-options。我认为您正在发送通知。您需要发送数据消息。

像这样的东西。

{
"to" : "bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
   "data" : {
 "Nick" : "Mario",
 "body" : "great match!",
 "Room" : "PortugalVSDenmark"
},
}