Show notification on create

MainActivity.kt

package com.example.direct_reply_notification

import android.os.Bundle
import io.flutter.embedding.android.FlutterActivity

class MainActivity: FlutterActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        NotificationHelper.createChannel(this)
        NotificationHelper.showNotification(this) // show notification on create
                                                  // can be called anywhere when you need to show notification
    }
}