twong-flutter/lib/utils/notification.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';

class Notifications {
  static FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin;

  static void init(BuildContext context) async {
    flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
    // initialise the plugin. app_icon needs to be a added as a drawable resource to the Android head project
    const AndroidInitializationSettings initializationSettingsAndroid =
    AndroidInitializationSettings('notify');
    final IOSInitializationSettings initializationSettingsIOS = IOSInitializationSettings(
        onDidReceiveLocalNotification: onDidReceiveLocalNotification);
    final MacOSInitializationSettings initializationSettingsMacOS =
    MacOSInitializationSettings();
    final InitializationSettings initializationSettings = InitializationSettings(
        android: initializationSettingsAndroid,
        iOS: initializationSettingsIOS,
        macOS: initializationSettingsMacOS);
    await flutterLocalNotificationsPlugin.initialize(
        initializationSettings, onSelectNotification: selectNotification);
  }

  static Future onDidReceiveLocalNotification (int id, String title,
      String body, String payload) async {
    final bool result = await flutterLocalNotificationsPlugin
        .resolvePlatformSpecificImplementation<
        IOSFlutterLocalNotificationsPlugin>()
        ?.requestPermissions(
      alert: true,
      badge: true,
      sound: true,
    );
  }

  static Future selectNotification(String payload) async {
    // if (payload != null) {
    //   Events.fire(NotifyMessage(payload));
    // } else {
    //   print("get notify");
    // }
  }

  static Future showNotify(String title, String body, { String payload }) async {
    const AndroidNotificationDetails androidPlatformChannelSpecifics =
    AndroidNotificationDetails(
        'your channel id', 'your channel name', 'your channel description',
        importance: Importance.max,
        priority: Priority.high,
        showWhen: false);
    const NotificationDetails platformChannelSpecifics =
    NotificationDetails(android: androidPlatformChannelSpecifics);
    return await flutterLocalNotificationsPlugin.show(
        0, title, body, platformChannelSpecifics,
        payload: payload);
  }
}