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:flutter_native_timezone/flutter_native_timezone.dart';
import 'package:get/get.dart';
import 'package:sqflite_pust_local_notification/models/task_model.dart';
import 'package:sqflite_pust_local_notification/ui/notified_screen.dart';
import 'package:timezone/data/latest.dart' as tz;
import 'package:timezone/timezone.dart' as tz;

import '../utils/assets_string.dart';

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

  initializeNotification() async {
    _configureLocalTimezone();
    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 int id, 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(
  //       id, title, body, platformChannelSpecifics,
  //       payload: "${title}|" + "${body}|");
  // }

  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: title,
    );
  }

  scheduledNotification(int hours, int minutes, TaskModel taskModel) async {
    print("Call Notification");
    await flutterLocalNotificationsPlugin.zonedSchedule(
        taskModel.id!.toInt(),
        taskModel.title,
        taskModel.note,
        _convertTimeDeration(hours, minutes),
        //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,
        matchDateTimeComponents: DateTimeComponents.time,
        payload: "${taskModel.title}|" + "${taskModel.note}|");
  }

  tz.TZDateTime _convertTimeDeration(int hours, int minutes) {
    final tz.TZDateTime now = tz.TZDateTime.now(tz.local);
    print(now);
    tz.TZDateTime scheduleDate =
        tz.TZDateTime(tz.local, now.year, now.month, now.day, hours, minutes);

    if (scheduleDate.isBefore(now)) {
      scheduleDate = scheduleDate.add(const Duration(days: 1));
    }
    print(scheduleDate);
    return scheduleDate;
  }

  Future<void> _configureLocalTimezone() async {
    tz.initializeTimeZones();
    final String timeZone = await FlutterNativeTimezone.getLocalTimezone();
    tz.setLocalLocation(tz.getLocation(timeZone));
  }

  Future onDidReceiveLocalNotification(
      int id, String? title, String? body, String? payload) async {
    Get.dialog(Text("Welcome to Flutter"));
  }

  Future selectNotification(String? payload) async {
    if (payload != null) {
      print('notification payload: $payload');
    } else {
      print("Notification Done");
    }
    if (payload == "Theme Change" || payload == "Add Task") {
    } else {
      Get.to(() => NotifiedScreen(lable: payload));
    }
  }
}