notification_style.kt

package com.obodo.app

import android.os.Bundle

import android.app.NotificationChannel
import android.app.NotificationManager
import android.content.Context
import android.os.Build

import io.flutter.app.FlutterActivity
import io.flutter.plugins.GeneratedPluginRegistrant

class MainActivity: FlutterActivity() {
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    GeneratedPluginRegistrant.registerWith(this)
    createNotificationChannel()
  }
  private fun createNotificationChannel() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        val name = "Product Chats"
        val descriptionText = "These are the product chats"
        val importance = NotificationManager.IMPORTANCE_DEFAULT
        val CHANNEL_ID = "product_chats_channel"
        val channel = NotificationChannel(CHANNEL_ID, name, importance).apply {
            description = descriptionText
        }
        // Register the channel with the system
        val notificationManager: NotificationManager =
            getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
        notificationManager.createNotificationChannel(channel)
    }
}
}