Notification.kt

fun createFullScreenIntentNotification(context: Context){
        val fullScreenIntent = Intent(context, MainActivity2::class.java)
        val fullScreenPendingIntent = PendingIntent.getActivity(context, 0,
            fullScreenIntent, PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_MUTABLE)

        val notificationBuilder =
            NotificationCompat.Builder(context, NotificationChannels.CHANNEL1)
                .setSmallIcon(R.drawable.desk)
                .setContentTitle("Incoming call")
                .setContentText("+9178458787XXX")
                .setPriority(NotificationCompat.PRIORITY_HIGH)
                .setCategory(NotificationCompat.CATEGORY_CALL)
                .setFullScreenIntent(fullScreenPendingIntent, true)

        val incomingCallNotification = notificationBuilder.build()
        with(NotificationManagerCompat.from(context)) {
            notify(1445457, incomingCallNotification)
        }
    }