FCM前台和后台通知布局视图和PendingIntent

Question

I'm creating notification using Firebase and FCM

class FcmServices: FirebaseMessagingService() {

    override fun onMessageReceived(remoteMessage: RemoteMessage) {
        sendNotification(remoteMessage)
    }

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

    private fun sendNotification(remoteMessage: RemoteMessage) {

        val notifTitle = remoteMessage.notification?.title
        val notifBody = remoteMessage.notification?.body

        val builder: NotificationCompat.Builder?
        val notificationManager =
            this.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

        val channelId = "101"

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val importance = NotificationManager.IMPORTANCE_DEFAULT
            val notificationChannel = NotificationChannel(channelId, "notification", importance)
            notificationManager.createNotificationChannel(notificationChannel)
            builder = NotificationCompat.Builder(applicationContext, notificationChannel.id)
        } else {
            builder = NotificationCompat.Builder(applicationContext)
        }

        val intent = Intent(this, NotifikasiActivity::class.java)
        intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
        val pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)

        builder.setSmallIcon(R.drawable.logo_bprmsa)
            .setLargeIcon(
                BitmapFactory.decodeResource(
                    this.resources,
                    R.drawable.logo_bprmsa
                )
            )
            .setContentIntent(pendingIntent)
            .setContentTitle(notifTitle)
            .setContentText(notifBody)
            .setDefaults(Notification.DEFAULT_VIBRATE)

        var alarmSound: Uri? = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)
        if (alarmSound == null) {
            alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE)
            if (alarmSound == null) {
                alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)
            }
        }
        builder.setSound(alarmSound)
        builder.setAutoCancel(true)
        builder.setWhen(System.currentTimeMillis())
        builder.setDefaults(NotificationCompat.DEFAULT_VIBRATE)
        builder.priority = NotificationCompat.PRIORITY_HIGH
        notificationManager.notify(Random().nextInt(), builder.build())

    }

}

I need to open the NotificationActivity after click the notification received from Firebase, but the problem is the PendingIntent is not working while the app is in background state. Is there any different condition between foreground and background state code?

And for the second, the layout of foreground and background is also different ( background state without the icon shown)

Answer 1

https://firebase.google.com/docs/cloud-messaging/concept-options

Based on the official document from Google, it is intentional. The Icon and any other buttons or others you wish to display other than the title and the message won't display if your app is not running foreground.