In flutter how to clear notification in bar?

Question

I am learning Google cloud messaging and firebase messaging is working fine, but when a user do not click at the notification to open the app and instead goes directly to app by manually opening it and bringing to foreground, the notification stays. I want those notification message related to my app go away when the app comes to foreground. How can I achieve this ?

Answer 1

Shri Hari solution did the trick. Kotlin:

import android.app.NotificationManager
import android.content.Context
import io.flutter.embedding.android.FlutterActivity


class MainActivity: FlutterActivity() {

    override fun onResume() {
        super.onResume()
        closeAllNotifications();
    }

    private fun closeAllNotifications() {
        val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
        notificationManager.cancelAll()
    }

}

And For IOS I use UNUserNotificationCenter:

import UIKit
import Flutter
import UserNotifications

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {

    GeneratedPluginRegistrant.register(with: self)
    if #available(iOS 10.0, *) {
        application.applicationIconBadgeNumber = 0 // For Clear Badge Counts
        let center = UNUserNotificationCenter.current()
        center.removeAllDeliveredNotifications() // To remove all delivered notifications
        center.removeAllPendingNotificationRequests()
    }
     
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}