Upload data to server from background through FirebaseMessegingService class

Question

In my app I am using FCM to get notifications. And everything is working when my app is running in foreground but problem starts when app goes in background or if app gets killed from background, in this case I am getting the notification but data is not uploading on the server.

For uploading data to the server I am using a separate class where all the required code is written and I am Just calling it in the FirebaseMessagingService() class.

I tried all possible ways, I tried to make separate service but it didn't work.

But I want to upload data to server When I am getting notification.

here is my FirebaseMessegingService Class

class FirebaseShareDevMessagingService : FirebaseMessagingService() {

private var resultIntent: Intent? = null

override fun onNewToken(p0: String) {
    super.onNewToken(p0)
}

var mNotificationManager: NotificationManager? = null


@RequiresApi(Build.VERSION_CODES.O)
override fun onMessageReceived(remoteMessage: RemoteMessage) {
    super.onMessageReceived(remoteMessage)

    Log.d("remoteMessage", "onMessageReceived: ${remoteMessage.data}")
    // playing audio and vibration when user se request
    val notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)
    val r = RingtoneManager.getRingtone(this, notification)
    r.play()
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
        r.isLooping = false
    }

    val data: MutableMap<String, String> = remoteMessage.data
    val deviceId = data["username"]
    val deviceName = data["address"]
    val notificationType = data["notificationType"]


     //codes  
     ....
     ....



    val pendingIntent =
        PendingIntent.getActivity(this, 1, resultIntent, PendingIntent.FLAG_UPDATE_CURRENT)
    builder.setContentTitle(remoteMessage.notification!!.title)
    builder.setContentText(remoteMessage.notification!!.body)
    builder.setContentIntent(pendingIntent)
    builder.setVibrate(longArrayOf(100, 300, 300, 300))
    builder.setStyle(
        NotificationCompat.BigTextStyle().bigText(
            remoteMessage.notification!!.body
        )
    )

    builder.setAutoCancel(true)
    mNotificationManager =
        applicationContext.getSystemService(NOTIFICATION_SERVICE) as NotificationManager
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        val channelId = "Your_channel_id"
        val channel = NotificationChannel(
            channelId,
            "Channel human readable title",
            NotificationManager.IMPORTANCE_DEFAULT
        )
        mNotificationManager!!.createNotificationChannel(channel)
        builder.setChannelId(channelId)
    }


    mNotificationManager!!.notify(System.currentTimeMillis().toInt(), builder.build())

    val cal = TimeStampConverter.getTimeStamp(remoteMessage.sentTime.toString())

    Log.d("OnReceivedNotification", "onMessageReceived:$remoteMessage ")


   // here i am calling helper class to upload data to 
   // server.....
    BackendServerHelperClass(applicationContext).saveNotification(
        System.currentTimeMillis().toInt(),
        remoteMessage.notification!!.title!!,
        remoteMessage.notification!!.body!!,
        FirebaseAuth.getInstance().uid.toString(),
        cal.time.toString(),
        deviceId,
        deviceName,
        isAllowedSubLetting.toBoolean(),
        notificationType!!.toInt()           )

 }
}

Please help, if there is any way to achieve this.

Updated

I tried to give permission of Screen overlay but still its not working

Help will be appreciated:) Thanks

Answer 1

After a lot of research i found solution.

If we want to receive notification in background and want to do some other stuffs in background if notification is received so we should simply sent the "data" section instead "notification" section.

if we sent both "data" and "notification" then we will receive a notification in background but if you are doing some other stuffs in "onMessageReceive" like saving data to ROOM DATABASE or uploading some data to SERVER. , then you should sent only "data" section.

example of data section:

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

This solved my problem.

You can read more about this on official FCM documentation.

Thanks!! Happy coding:)