Notification.kt

fun createCustomNotification(context: Context){
        val notificationLayout = RemoteViews(context.packageName, R.layout.notification_small)
        val notificationLayoutExpanded = RemoteViews(context.packageName, R.layout.notification_small)

        val customNotification = NotificationCompat.Builder(context, NotificationChannels.CHANNEL1)
            .setSmallIcon(R.drawable.notification_icon)
            .setStyle(NotificationCompat.DecoratedCustomViewStyle())
            .setCustomContentView(notificationLayout)
            .setCustomBigContentView(notificationLayoutExpanded)
            .build()
        with(NotificationManagerCompat.from(context)) {
            notify(1445457, customNotification)
        }
    }