notif.kt

    private fun generateForegroundNotification() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val intentMainLanding = Intent(this, MainActivity::class.java)
            val pendingIntent =
                PendingIntent.getActivity(this, 0, intentMainLanding, 0)
            iconNotification = BitmapFactory.decodeResource(resources, R.mipmap.ic_launcher)
            if (mNotificationManager == null) {
                mNotificationManager = this.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
            }
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                assert(mNotificationManager != null)
                mNotificationManager?.createNotificationChannelGroup(
                    NotificationChannelGroup("chats_group", "Chats")
                )
                val notificationChannel =
                    NotificationChannel("service_channel", "Service Notifications",
                        NotificationManager.IMPORTANCE_MIN)
                notificationChannel.enableLights(false)
                notificationChannel.lockscreenVisibility = Notification.VISIBILITY_SECRET
                mNotificationManager?.createNotificationChannel(notificationChannel)
            }
            val builder = NotificationCompat.Builder(this, "service_channel")

            builder.setContentTitle(StringBuilder(resources.getString(R.string.app_name)).append(" service is running").toString())
                .setTicker(StringBuilder(resources.getString(R.string.app_name)).append("service is running").toString())
                .setContentText("Touch to open") //                    , swipe down for more options.
                .setSmallIcon(R.drawable.ic_alaram)
                .setPriority(NotificationCompat.PRIORITY_LOW)
                .setWhen(0)
                .setOnlyAlertOnce(true)
                .setContentIntent(pendingIntent)
                .setOngoing(true)
            if (iconNotification != null) {
                builder.setLargeIcon(Bitmap.createScaledBitmap(iconNotification!!, 128, 128, false))
            }
            builder.color = resources.getColor(R.color.purple_200)
            notification = builder.build()
            startForeground(mNotificationId, notification)
        }

    }