flutter_local_notifications_change_time 更改通知时间 #

在本示例中，我们将展示如何使用 flutter_local_notifications_change_time 插件来更改已安排的通知的时间。

配置环境

首先，确保在你的项目中添加了 flutter_local_notifications 和 flutter_local_notifications_change_time 插件依赖。在你的 pubspec.yaml 文件中添加以下内容：

dependencies:
  flutter:
    sdk: flutter
  flutter_local_notifications: ^9.0.0
  flutter_local_notifications_change_time: ^1.0.0

然后运行 flutter pub get 来安装这些依赖。

初始化 flutter_local_notifications

在你的应用启动时，你需要初始化 flutter_local_notifications 插件。这通常在你的 main.dart 文件中完成：

import 'package:flutter/material.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:flutter_local_notifications_change_time/flutter_local_notifications_change_time.dart';

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

  // 初始化 FlutterLocalNotificationsPlugin
  final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
  
  // 配置 Android 和 iOS 的通知设置
  const AndroidInitializationSettings initializationSettingsAndroid =
      AndroidInitializationSettings('app_icon');
  final InitializationSettings initializationSettings = InitializationSettings(
    android: initializationSettingsAndroid,
  );
  
  await flutterLocalNotificationsPlugin.initialize(initializationSettings);

  runApp(MyApp(flutterLocalNotificationsPlugin: flutterLocalNotificationsPlugin));
}

创建并调度通知

接下来，我们创建一个通知并将其调度到特定时间：

class MyApp extends StatefulWidget {
  final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin;

  MyApp({required this.flutterLocalNotificationsPlugin});

  [@override](/user/override)
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  [@override](/user/override)
  void initState() {
    super.initState();
    
    // 创建一个通知详情对象
    const AndroidNotificationDetails androidPlatformChannelSpecifics =
        AndroidNotificationDetails('your channel id', 'your channel name',
            importance: Importance.max, priority: Priority.high);
    const NotificationDetails platformChannelSpecifics =
        NotificationDetails(android: androidPlatformChannelSpecifics);

    // 调度通知
    Future<void> scheduledNotification = widget.flutterLocalNotificationsPlugin.zonedSchedule(
      0,
      'scheduled title',
      'scheduled body',
      tz.TZDateTime.now(tz.local).add(const Duration(seconds: 10)),
      platformChannelSpecifics,
      androidAllowWhileIdle: true,
      uiLocalNotificationDateInterpretation:
          UILocalNotificationDateInterpretation.absoluteTime,
      matchDateTimeComponents: DateTimeComponents.time,
    );

    // 等待通知调度完成
    scheduledNotification.then((value) {
      print('通知已调度');
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Flutter Local Notifications')),
        body: Center(child: Text('检查控制台输出以确认通知是否调度成功')),
      ),
    );
  }
}

更改已调度的通知时间

现在，让我们看看如何更改已经调度的通知的时间：

import 'package:flutter_local_notifications_change_time/flutter_local_notifications_change_time.dart';

// 在某个地方（例如按钮点击事件）更改通知时间
Future<void> changeScheduledNotificationTime(int notificationId) async {
  final FlutterLocalNotificationsChangeTime flutterLocalNotificationsChangeTime =
      FlutterLocalNotificationsChangeTime(widget.flutterLocalNotificationsPlugin);

  // 设置新的调度时间
  final tz.TZDateTime newScheduledTime = tz.TZDateTime.now(tz.local).add(const Duration(minutes: 5));

  // 更改通知时间
  await flutterLocalNotificationsChangeTime.changeTime(notificationId, newScheduledTime);

  print('通知时间已更改为 $newScheduledTime');
}

在上面的代码中，我们定义了一个函数 changeScheduledNotificationTime，它接受通知ID作为参数，并将通知的调度时间更改为当前时间之后的5分钟。

总结

通过使用 flutter_local_notifications_change_time 插件，你可以轻松地更改已调度的通知的时间。这在需要动态调整通知时间的应用场景中非常有用。