sqflite_pust_local_notification/lib/services/notification_service.dart

import 'package:flutter/material.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:get/get.dart';
import 'package:timezone/data/latest.dart' as tz;
import 'package:timezone/timezone.dart' as tz;

class NotifyHelper {
  FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
      FlutterLocalNotificationsPlugin(); //

  initializeNotification() async {
    tz.initializeTimeZones();
    final IOSInitializationSettings initializationSettingsIOS =
        IOSInitializationSettings(
            requestSoundPermission: false,
            requestBadgePermission: false,
            requestAlertPermission: false,
            onDidReceiveLocalNotification: onDidReceiveLocalNotification);

    final AndroidInitializationSettings initializationSettingsAndroid =
        AndroidInitializationSettings("appicon");

    final InitializationSettings initializationSettings =
        InitializationSettings(
      iOS: initializationSettingsIOS,
      android: initializationSettingsAndroid,
    );
    await flutterLocalNotificationsPlugin.initialize(initializationSettings,
        onSelectNotification: selectNotification);
  }

  // Requeste Permission for IOS
  void requestIOSPermissions() {
    flutterLocalNotificationsPlugin
        .resolvePlatformSpecificImplementation<
            IOSFlutterLocalNotificationsPlugin>()
        ?.requestPermissions(
          alert: true,
          badge: true,
          sound: true,
        );
  }

  displayNotification({required String title, required String body}) async {
    print("doing test");
    var androidPlatformChannelSpecifics = new AndroidNotificationDetails(
        'your channel id', 'your channel name',
        channelDescription: '',
        importance: Importance.max,
        priority: Priority.high);
    var iOSPlatformChannelSpecifics = new IOSNotificationDetails();
    var platformChannelSpecifics = new NotificationDetails(
        android: androidPlatformChannelSpecifics,
        iOS: iOSPlatformChannelSpecifics);
    await flutterLocalNotificationsPlugin.show(
      0,
      title,
      body,
      platformChannelSpecifics,
      payload: 'Default_Sound',
    );
  }

  scheduledNotification() async {
    await flutterLocalNotificationsPlugin.zonedSchedule(
        0,
        'scheduled title',
        'theme changes 5 seconds ago',
        tz.TZDateTime.now(tz.local).add(const Duration(seconds: 5)),
        const NotificationDetails(
            android: AndroidNotificationDetails(
                'your channel id', 'your channel name',
                channelDescription: '')),
        androidAllowWhileIdle: true,
        uiLocalNotificationDateInterpretation:
            UILocalNotificationDateInterpretation.absoluteTime);
  }

  Future onDidReceiveLocalNotification(
      int id, String? title, String? body, String? payload) async {
    // display a dialog with the notification details, tap ok to go to another page
    // showDialog(
    //   //context: context,
    //   builder: (BuildContext context) => CupertinoAlertDialog(
    //     title: Text(title),
    //     content: Text(body),
    //     actions: [
    //       CupertinoDialogAction(
    //         isDefaultAction: true,
    //         child: Text('Ok'),
    //         onPressed: () async {
    //           Navigator.of(context, rootNavigator: true).pop();
    //           await Navigator.push(
    //             context,
    //             MaterialPageRoute(
    //               builder: (context) => SecondScreen(payload),
    //             ),
    //           );
    //         },
    //       )
    //     ],
    //   ),
    // );
    Get.dialog(Text("Welcome to Flutter"));
  }

  Future selectNotification(String? payload) async {
    if (payload != null) {
      print('notification payload: $payload');
    } else {
      print("Notification Done");
    }
    Get.to(() => Container(
          color: Colors.white,
        ));
  }
}