ForegroundService.kt

class ForegroundService : Service() {


    override fun onCreate() {
        super.onCreate()
    }

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val serviceChannel = NotificationChannel(
                "myServiceChannel",
                "My Service Channel",
                NotificationManager.IMPORTANCE_DEFAULT
            )

            val notificationManager = getSystemService(NotificationManager::class.java)
            notificationManager?.createNotificationChannel(serviceChannel)
        }
        val notificationIntent = Intent(this, MainActivity::class.java)
        val pendingIntent = PendingIntent.getActivity(
            this,
            0,
            notificationIntent,
            PendingIntent.FLAG_IMMUTABLE
        )

        val notification = NotificationCompat.Builder(this, "myServiceChannel")
            .setContentTitle("foregroundServiceNotificationTitle")
            .setContentText("input")
            .setSmallIcon(R.drawable.ic_launcher_nav)
            .setContentIntent(pendingIntent)
            // todo don't wait for 10 seconds
            //.setForegroundServiceBehavior(FOREGROUND_SERVICE_IMMEDIATE)
            .build()
        startForeground(1, notification)
        return START_NOT_STICKY
    }

    override fun onDestroy() {
        super.onDestroy()
    }

    override fun onBind(intent: Intent?): IBinder? {
        return null
    }
}