android notification kotlin

 private var notificationManager: NotificationManager? = null
 
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_notify_demo)
 
        notificationManager = 
                  getSystemService(
                   Context.NOTIFICATION_SERVICE) as NotificationManager
 
        createNotificationChannel(
                "com.ebookfrenzy.notifydemo.news",
                "NotifyDemo News",
                "Example News Channel")
    }
 
    private fun createNotificationChannel(id: String, name: String,
                                            description: String) {
 
        val importance = NotificationManager.IMPORTANCE_LOW
        val channel = NotificationChannel(id, name, importance)
 
        channel.description = description
        channel.enableLights(true)
        channel.lightColor = Color.RED
        channel.enableVibration(true)
        channel.vibrationPattern = 
            longArrayOf(100, 200, 300, 400, 500, 400, 300, 200, 400)
        notificationManager?.createNotificationChannel(channel)
    }


//Usage
val notification = Notification.Builder(this@NotifyDemoActivity,
        channelID)
        .setContentTitle("Example Notification")
        .setContentText("This is an  example notification.")
        .setSmallIcon(android.R.drawable.ic_dialog_info)
        .setChannelId(channelID)
        .setNumber(10)
        .build()