How to send fcm notification when app is not running

Question

I have tried many solutions but none of them are worked. I am able receive FCM notification when app is active, but not getting notification when app is background or killed.

Try passing both the notification and data payload in your FCM notification. Read more here https://firebase.google.com/docs/cloud-messaging/android/receive — Atish Agrawal, Feb 18 '20 at 11:34
Does this answer your question? [How to handle notification when app in background in Firebase](https://stackoverflow.com/questions/37711082/how-to-handle-notification-when-app-in-background-in-firebase) — Ryan M, Jun 24 '21 at 08:04

Mohsen · Answer 1 · 2020-02-18T12:38:42.740

you need to create a service class extending FirebaseMessagingService and override onMessageReceived method in that class to send notification

class MyFirebaseMessagingService : FirebaseMessagingService() {

    override fun onMessageReceived(message: RemoteMessage) {
        super.onMessageReceived(message)
        try {
            message.notification?.let {
                showNotification(
                    it.title ?: "",
                    it.body ?: ""
                )

            }
        } catch (e: Exception) {
            e.printStackTrace()
        }
    }
}

you are now getting the notification info from backend and showing it as a notification by using the function showNotification. of course, you must implement the function showNotification. it just a simple function for showing notifications in android

Edit: this the implementation of the function, add this to your class

class MyFirebaseMessagingService : FirebaseMessagingService() {

    companion object {
        const val channelId = "Channel"
        const val channelName = "MyChannel"
        const val smallIcon: Int = R.drawable.ic_logo
        const val notificationId = 1
    }

        fun showNotification(myTitle: String, myBody: String) {

        val notificationBuilder = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            Notification.Builder(applicationContext, channelId)
        } else {
            Notification.Builder(applicationContext)
        }

        val intent = Intent(applicationContext, HomeActivity::class.java)
        val pendingIntent = PendingIntent.getActivity(
            applicationContext,
            0,
            intent,
            PendingIntent.FLAG_UPDATE_CURRENT
        )
        val notificationManager =
            applicationContext.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

        when {
            Build.VERSION.SDK_INT >= 26 -> {
                val channel = NotificationChannel(
                    channelId,
                    channelName,
                    NotificationManager.IMPORTANCE_DEFAULT
                )
                notificationManager.createNotificationChannel(channel)
                notificationBuilder
                    .setContentIntent(pendingIntent)
                    .setContentText(myBody)
                    .setSmallIcon(smallIcon)
                    .setContentTitle(myTitle)
            }

            Build.VERSION.SDK_INT >= 24 -> notificationBuilder
                .setContentText(myBody)
                .setContentTitle(myTitle)
                .setSmallIcon(smallIcon)
                .setContentIntent(pendingIntent)

            else -> notificationBuilder
                .setContentText(myBody)
                .setContentTitle(myTitle)
                .setSmallIcon(smallIcon)
                .setContentIntent(pendingIntent)
        }
        notificationManager.notify(notificationId, notificationBuilder.build())
    }


}

score 0 · Answer 2 · answered Feb 18 '20 at 14:03

If you want to get notification when app is background or killed your json object has to be this like:

{ "data":{ "title" : "your_title", "body" : "your_body" }, "to": "device_token", "priority": "high" }

You can catch notification onMessageReceived

How to send fcm notification when app is not running

2 Answers2