Flutter：应用程序终止时触发通知

Question

有没有一种方法可以在不使用远程服务器的情况下实现以下功能：在我的应用程序中，我可以安排提醒。这些在应用程序打开或在后台运行时触发，但不会在应用程序终止时触发。当应用程序终止或以某种方式将它们安排到某种操作系统级别时，是否有任何库可以触发计划通知？或者我需要通过像 firebase 这样的远程服务器来触发它们吗？

目前我正在使用 flutter_local_notifications 包。我的通知服务如下所示：

import 'package:timezone/timezone.dart' as tz;

import '../db_models/reminder_model.dart';

class NotificationService {
  final FlutterLocalNotificationsPlugin _flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();

  // Initialize the notification settings
  Future<void> initNotifications() async {
    final InitializationSettings initializationSettings = InitializationSettings(
      android: AndroidInitializationSettings('@mipmap/ic_launcher'),
      iOS: DarwinInitializationSettings(),
      // Add other platform-specific settings if needed
    );

    await _flutterLocalNotificationsPlugin.initialize(
      initializationSettings,
      onDidReceiveNotificationResponse: _onDidReceiveNotificationResponse,
      onDidReceiveBackgroundNotificationResponse: _onDidReceiveBackgroundNotificationResponse,
    );
  }

  // Schedule a notification
  Future<void> scheduleNotification(Reminder reminder) async {
    // Convert triggerTime to a DateTime object
    // Extract the current date
    final currentDate = DateTime.now();
    // Extract the hour and minute from the triggerTime
    final timeParts = reminder.getTriggerTime().split(':');
    final hour = int.parse(timeParts[0]);
    final minute = int.parse(timeParts[1]);

    // Combine them into a DateTime object
    final scheduledTime = DateTime(currentDate.year, currentDate.month, currentDate.day, hour, minute);

    //final DateTime scheduledTime = DateTime.parse(reminder.getTriggerTime());
    final tz.TZDateTime tzScheduledTime = tz.TZDateTime.from(scheduledTime, tz.local);
    print('TriggerTime: $tzScheduledTime');


    // Define the notification details
    var androidDetails = AndroidNotificationDetails(
      'channel_id',
      'channel_name',
      channelDescription: 'channel_description',
      importance: Importance.max,
      priority: Priority.high,
    );
    var iosDetails = DarwinNotificationDetails();
    var platformDetails = NotificationDetails(android: androidDetails, iOS: iosDetails);

    // Schedule the notification
    await _flutterLocalNotificationsPlugin.zonedSchedule(
      reminder.getId(),
      'Water Reminder',
      'Time to drink water!',
      tzScheduledTime,
      platformDetails,
      androidScheduleMode: AndroidScheduleMode.exactAllowWhileIdle,
      uiLocalNotificationDateInterpretation: UILocalNotificationDateInterpretation.absoluteTime,
      matchDateTimeComponents: DateTimeComponents.time, // To repeat daily at the same time
      payload: "hey boss!!!!"
    );
    var pendingNotifications = await _flutterLocalNotificationsPlugin.pendingNotificationRequests();

    for (var notification in pendingNotifications) {
      print('Notification: id=${notification.id}, title=${notification.title}, body=${notification.body}, payload=${notification.payload}');
    }
  }

  Future<void> triggerNotificationNow(int notificationId) async {
    // Retrieve the details of the scheduled notification by its ID
    // This step depends on how you store your scheduled notifications

    var androidDetails = AndroidNotificationDetails(
      'channel_id',
      'channel_name',
      channelDescription: 'channel_description',
      importance: Importance.max,
      priority: Priority.high,
    );
    var iosDetails = DarwinNotificationDetails();
    var platformDetails = NotificationDetails(android: androidDetails, iOS: iosDetails);


    // Schedule the notification to trigger immediately
    await _flutterLocalNotificationsPlugin.zonedSchedule(
    notificationId,
    "Test",
    "Wabec lol haha",
    tz.TZDateTime.now(tz.local).add(Duration(seconds: 5)),
platformDetails, uiLocalNotificationDateInterpretation: UILocalNotificationDateInterpretation.absoluteTime
    );
    }

  // Handle notification response when the app is running
  void _onDidReceiveNotificationResponse(NotificationResponse response) {
    // Handle the notification response
  }

  // Handle notification response when the app is in the background
}

void _onDidReceiveBackgroundNotificationResponse(
    NotificationResponse response) {
  print("Notification clicked with payload: ${response.payload}");
  // Handle the background notification response
}

当我安排通知时，它会在应用程序在前台/后台运行时触发，但不会在应用程序终止时触发。

我在 Android API 上进行了测试：28、29 和 34（我知道从某个 API 开始，您需要特殊权限才能进行精确调度）

Answer 1

您需要使用 Firebase 推送通知或 One Signal，因为 ios 不支持后台获取或此类内容。之后，您可以将传入的通知（来自该服务）重定向到您的本地解决方案。