FocusGram-Android/lib/services/notification_service.dart

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

class NotificationService {
  static final NotificationService _instance = NotificationService._internal();
  factory NotificationService() => _instance;
  NotificationService._internal();

  final FlutterLocalNotificationsPlugin _notificationsPlugin =
      FlutterLocalNotificationsPlugin();

  Future<void> init() async {
    const AndroidInitializationSettings initializationSettingsAndroid =
        AndroidInitializationSettings('@mipmap/ic_launcher');

    const DarwinInitializationSettings initializationSettingsIOS =
        DarwinInitializationSettings(
          requestAlertPermission: false,
          requestBadgePermission: false,
          requestSoundPermission: false,
        );

    const InitializationSettings initializationSettings =
        InitializationSettings(
          android: initializationSettingsAndroid,
          iOS: initializationSettingsIOS,
        );

    await _notificationsPlugin.initialize(
      settings: initializationSettings,
      onDidReceiveNotificationResponse: (details) {
        // Handle notification tap
      },
    );
  }

  Future<void> showNotification({
    required int id,
    required String title,
    required String body,
  }) async {
    const AndroidNotificationDetails androidDetails =
        AndroidNotificationDetails(
          'focusgram_channel',
          'FocusGram Notifications',
          channelDescription: 'Notifications for FocusGram sessions and alerts',
          importance: Importance.max,
          priority: Priority.high,
          showWhen: true,
        );

    const DarwinNotificationDetails iosDetails = DarwinNotificationDetails(
      presentAlert: true,
      presentBadge: true,
      presentSound: true,
    );

    const NotificationDetails platformDetails = NotificationDetails(
      android: androidDetails,
      iOS: iosDetails,
    );

    try {
      await _notificationsPlugin.show(
        id: id,
        title: title,
        body: body,
        notificationDetails: platformDetails,
      );
    } catch (e) {
      debugPrint('Notification error: $e');
    }
  }
}