diplomatic-quarter/lib/uitl/LocalNotification.dart

import 'dart:math';
import 'dart:typed_data';
import 'dart:ui';

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

final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();

class LocalNotification {
  Function(String payload) _onNotificationClick;
  static LocalNotification _instance;
  static LocalNotification getInstance(){
    return _instance;
  }
  static init({Function(String payload) onNotificationClick}){
    if(_instance == null){
      _instance = LocalNotification();
      _instance._onNotificationClick = onNotificationClick;
      _instance._initialize();
    }else{
      // assert(false,(){
      //   //TODO fix it
      //   "LocalNotification Already Initialized";
      // });
    }
  }

  _initialize(){
    var initializationSettingsAndroid = new AndroidInitializationSettings('app_icon');
    var initializationSettingsIOS = IOSInitializationSettings(onDidReceiveLocalNotification: null);
    var initializationSettings = InitializationSettings(initializationSettingsAndroid, initializationSettingsIOS);
    flutterLocalNotificationsPlugin.initialize(initializationSettings, onSelectNotification: _onNotificationClick);
  }

  var _random = new Random();
  _randomNumber({int from = 100000}){
    return _random.nextInt(from);
  }

  _vibrationPattern(){
    var vibrationPattern = Int64List(4);
    vibrationPattern[0] = 0;
    vibrationPattern[1] = 1000;
    vibrationPattern[2] = 5000;
    vibrationPattern[3] = 2000;

    return vibrationPattern;
  }

  Future showNow({@required String title, @required String subtitle, String payload}) {
    Future.delayed(Duration(seconds: 1)).then((result) async {
      var androidPlatformChannelSpecifics = AndroidNotificationDetails('com.hmg.local_notification', 'HMG', 'HMG', importance: Importance.Max, priority: Priority.High, ticker: 'ticker', vibrationPattern: _vibrationPattern());
      var iOSPlatformChannelSpecifics = IOSNotificationDetails();
      var platformChannelSpecifics = NotificationDetails(androidPlatformChannelSpecifics, iOSPlatformChannelSpecifics);
      await flutterLocalNotificationsPlugin.show(_randomNumber(), title, subtitle, platformChannelSpecifics, payload: payload);
    });
  }

  Future scheduleNotification({@required DateTime scheduledNotificationDateTime, @required String title, @required String description}) async {
    ///vibrationPattern
    var vibrationPattern = Int64List(4);
    vibrationPattern[0] = 0;
    vibrationPattern[1] = 1000;
    vibrationPattern[2] = 5000;
    vibrationPattern[3] = 2000;

    var androidPlatformChannelSpecifics = AndroidNotificationDetails('active-prescriptions', 'ActivePrescriptions', 'ActivePrescriptionsDescription',
        // icon: 'secondary_icon',
        sound: RawResourceAndroidNotificationSound('slow_spring_board'),

        ///change it to be as ionic
        // largeIcon: DrawableResourceAndroidBitmap('sample_large_icon'),///change it to be as ionic
        vibrationPattern: vibrationPattern,
        enableLights: true,
        color: const Color.fromARGB(255, 255, 0, 0),
        ledColor: const Color.fromARGB(255, 255, 0, 0),
        ledOnMs: 1000,
        ledOffMs: 500);
    var iOSPlatformChannelSpecifics = IOSNotificationDetails(sound: 'slow_spring_board.aiff');

    ///change it to be as ionic
    // var platformChannelSpecifics = NotificationDetails(
    //     androidPlatformChannelSpecifics, iOSPlatformChannelSpecifics);
    // await flutterLocalNotificationsPlugin.schedule(0, title, description,
    //     scheduledNotificationDateTime, platformChannelSpecifics);
  }

  ///Repeat notification every day at approximately 10:00:00 am
  Future showDailyAtTime() async {
    var time = Time(10, 0, 0);
    var androidPlatformChannelSpecifics = AndroidNotificationDetails('repeatDailyAtTime channel id', 'repeatDailyAtTime channel name', 'repeatDailyAtTime description');
    var iOSPlatformChannelSpecifics = IOSNotificationDetails();
    // var platformChannelSpecifics = NotificationDetails(
    //     androidPlatformChannelSpecifics, iOSPlatformChannelSpecifics);
    // await flutterLocalNotificationsPlugin.showDailyAtTime(
    //     0,
    //     'show daily title',
    //     'Daily notification shown at approximately ${_toTwoDigitString(time.hour)}:${_toTwoDigitString(time.minute)}:${_toTwoDigitString(time.second)}',
    //     time,
    //     platformChannelSpecifics);
  }

  ///Repeat notification weekly on Monday at approximately 10:00:00 am
  Future showWeeklyAtDayAndTime() async {
    var time = Time(10, 0, 0);
    var androidPlatformChannelSpecifics = AndroidNotificationDetails('show weekly channel id', 'show weekly channel name', 'show weekly description');
    var iOSPlatformChannelSpecifics = IOSNotificationDetails();
    // var platformChannelSpecifics = NotificationDetails(
    //     androidPlatformChannelSpecifics, iOSPlatformChannelSpecifics);
    // await flutterLocalNotificationsPlugin.showWeeklyAtDayAndTime(
    //     0,
    //     'show weekly title',
    //     'Weekly notification shown on Monday at approximately ${_toTwoDigitString(time.hour)}:${_toTwoDigitString(time.minute)}:${_toTwoDigitString(time.second)}',
    //     Day.Monday,
    //     time,
    //     platformChannelSpecifics);
  }

  String _toTwoDigitString(int value) {
    return value.toString().padLeft(2, '0');
  }

  Future cancelNotification() async {
    await flutterLocalNotificationsPlugin.cancel(0);
  }

  Future cancelAllNotifications() async {
    await flutterLocalNotificationsPlugin.cancelAll();
  }
}