我正在开发一个Flutter应用程序，它需要用户权限才能获得通知。该应用程序旨在具有一个带有按钮的主屏幕，当按下此按钮时，屏幕上应显示通知。但是，我遇到了这个特定功能的问题，当我按下按钮时，通知不会出现。
我已经实现了处理通知和用户权限所需的依赖项。我相信问题可能与按钮被按下时触发通知的代码有关。我正在寻求有关如何正确实现此功能并确保通知按预期显示的指导。
我使用的依赖项是flutter_local_notifications：^8.0.0和permission_handler：^10.2.0，沿着Dart 3.0.6。我无意更改任何依赖项版本。
如果您能在故障排除和解决此问题方面提供任何见解或帮助，我将不胜感激。提前感谢您的帮助！

//**main.dart**:

import 'package:flutter/material.dart';
import 'notification_service.dart';

// void main() async {

//   // needed to reqests nottification permission.
//   WidgetsFlutterBinding.ensureInitialized();
//   await NotificationService().init();
//   // ==========================================

//   runApp(const MyApp());
// }

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  // Initialize notification service and request permission
  final notificationService = NotificationService();
  await notificationService.init();

  runApp( MyApp());
}



class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Notification App'),
        ),
        body: Center(
          child: ElevatedButton(
            onPressed: () async {
              await NotificationService().showNotification();
            },
            child: Text('Show Notification'),
          ),
        ),
      ),
    );
  }
}



//**notification_service.dart**:

// This file will handle the setup and display of notifications.

import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:permission_handler/permission_handler.dart';

class NotificationService {
  final FlutterLocalNotificationsPlugin _flutterLocalNotificationsPlugin =
      FlutterLocalNotificationsPlugin();

Future<void> init() async {
  var initializationSettingsAndroid = const AndroidInitializationSettings('@mipmap/ic_launcher');
  const initializationSettingsIOS = IOSInitializationSettings();
  var initializationSettings = InitializationSettings(
    android: initializationSettingsAndroid,
    iOS: initializationSettingsIOS,
  );

  await _flutterLocalNotificationsPlugin.initialize(initializationSettings, onSelectNotification: onSelectNotification);

  // Request notification permissions
  await _requestNotificationPermission();
}

Future<void> _requestNotificationPermission() async {
  if (await Permission.notification.request().isGranted) {
    // Permission is granted, you can show notifications.
  } else {
    // Permission is not granted, handle accordingly (e.g., show an explanation dialog).
  }
}

Future<void> showNotification() async {
  print("Attempting to show notification...");

  const androidPlatformChannelSpecifics = AndroidNotificationDetails(
    'channel_id', // Change this to a unique channel ID
    'Channel Name', // Change this to a descriptive channel name
    'Channel Description', // Change this to a descriptive channel description, comment this line for flutter_local_notification ^9.0.0
    importance: Importance.high,
    priority: Priority.high,
  );
  var iOSPlatformChannelSpecifics = IOSNotificationDetails();
  var platformChannelSpecifics = NotificationDetails(
    android: androidPlatformChannelSpecifics,
    iOS: iOSPlatformChannelSpecifics,
  );

  try {
    await _flutterLocalNotificationsPlugin.show(
      0, // Change this to a unique notification ID
      'Notification Title',
      'Notification Body',
      platformChannelSpecifics,
      payload: 'Custom Payload',
    );
    print("Notification displayed successfully!");
  } catch (e) {
    print("Error displaying notification: $e");
  }
}

  Future<void> onSelectNotification(String? payload) async {
    // Handle the tapped notification here (if needed).
  }
}

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