Notification Channel in Android Kotlin

Step 1: Create AppController class and extends from Application class then declared this class name into the application tag of the android manifest file

AppController.kt

class AppController : Application() {

    companion object {
        var CHANNEL_1_ID = "chennal1"
        val CHENNEL_2_ID = "ServiceChannel"
    }

    override fun onCreate() {
        super.onCreate()

        createNotificationChennal()

    }

    fun createNotificationChennal() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val notificationChannel = NotificationChannel(
                CHANNEL_1_ID,
                "CHANNEL 1",
                NotificationManager.IMPORTANCE_DEFAULT
            )
            notificationChannel.description = "Channel 1 description"
            notificationChannel.enableLights(true)
            notificationChannel.enableVibration(true)
            notificationChannel.lightColor = Color.GREEN
            notificationChannel.setShowBadge(true)

            val notificationChennal2 =
                NotificationChannel(CHENNEL_2_ID, "CHENNAL 2", NotificationManager.IMPORTANCE_HIGH)
            notificationChennal2.description = "Notification from service"
            notificationChennal2.setShowBadge(true)

            val manager: NotificationManager =
                getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
//            manager.createNotificationChannel(notificationChannel)
//            manager.createNotificationChannel(notificationChennal2)

            var list: List =
                arrayListOf(notificationChannel, notificationChennal2)
            manager.createNotificationChannels(list)
        }

    }

}

Step 2: Create a notification method in MainActivity file with the notification channel

MainActivity.kt

button2.setOnClickListener {
       createNotification()
}


//Create location notification using channel id
    fun createNotification() {
        count++
        val intent = Intent(this, MainActivity::class.java)
        val pendingIntent: PendingIntent = PendingIntent.getActivity(this, 1, intent, 0)
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val notification: Notification = Notification.Builder(this, CHANNEL_1_ID)
                .setContentTitle("Notification Title $count")
                .setContentText("Notification text")
                .setSmallIcon(R.drawable.ic_launcher_background)
                .setLargeIcon(
                    BitmapFactory.decodeResource(
                        this.resources,
                        R.drawable.ic_launcher_foreground
                    )
                )
                .setContentIntent(pendingIntent)
                .build()

            val manager: NotificationManager =
                getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager;
            manager.notify(1, notification)
        }
    }

You can see full source code from below link

https://github.com/AndroidManikandan5689/Notification-in-Foreground-Service-Android

Demo screenshots: