Notifications.kt

//Functions.kt
public fun Context.setNotification(id: Int = 0, builderMethod: NotificationCompat.Builder.() -> Any) {
    val builder = NotificationCompat.Builder(this)
    builder.apply {
        builderMethod()
    }
    notificationManager().notify(id, builder.build())
}
//FCM Service.kt
this@MyFCMService.setNotification(2488, {
                    setContentTitle(it.title)
                    setContentText(it.body)
                    setColor(R.color.colorPrimary)
                    setSmallIcon(R.drawable.ic_notification_icon)

                    setAutoCancel(true)
                    val bigTextStyle = NotificationCompat.BigTextStyle(this)
                    bigTextStyle.setBigContentTitle(it.title)
                    bigTextStyle.bigText(it.body)
                    bigTextStyle.setSummaryText(it.body)

                    setStyle(bigTextStyle)
    
                    val intent = Intent(this@MyFCMService, MainActivity::class.java)
                    intent.putExtras(remoteMessage.data.extractBundle())
                    val stackBuilder: TaskStackBuilder = TaskStackBuilder.create(this@MyFCMService)
                    stackBuilder.addNextIntent(intent)
                    val pendingIntent = stackBuilder.getPendingIntent(2488, PendingIntent.FLAG_UPDATE_CURRENT)
                    setContentIntent(pendingIntent)
})