Flutter时间变化检测插件time_change_detector的使用

简介

time_change_detector 是一个Flutter插件，用于检测设备的时间、日期和时区的变化，支持Android和iOS平台。

设置

Android设置

• minSdkVersion: 23
• 在AndroidManifest.xml文件中添加以下代码：

<application
    ...
    <receiver
        android:name="com.randomforest.time_change_detector.TimeChangeDetectorPlugin"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.TIME_SET" />
            <action android:name="android.intent.action.TIMEZONE_CHANGED" />
            <action android:name="android.intent.action.DATE_CHANGED"/>
        </intent-filter>
    </receiver>
    <activity
        ...

iOS设置

• 在XCode中将Swift版本更改为5。
• 更新Podfile中的iOS目标版本为10.0。

示例代码

下面是一个完整的示例demo，展示了如何使用time_change_detector插件来监听时间变化，并在时间变化时创建通知。

// ignore_for_file: avoid_print

import 'dart:async';
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:awesome_notifications/awesome_notifications.dart';
import 'package:time_change_detector/time_change_detector.dart';

const String CHANNEL_KEY = 'your_channel_key';
const String CHANNEL_NAME = 'Your Channel Name';
const String CHANNEL_DESCRIPTION = 'Your Channel Description';
const String APP_TITLE = 'Time Change Detector Demo';
const String EVENT_MESSAGE_DEFAULT = 'Waiting for time change event...';
const String EVENT_MESSAGE_SUCCESS = 'Time Changed at';
const String ERROR = 'Error';
const String STREAM_COMPLETE = 'Stream Complete';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  AwesomeNotifications().initialize(null, [
    NotificationChannel(
        channelKey: CHANNEL_KEY,
        channelName: CHANNEL_NAME,
        channelDescription: CHANNEL_DESCRIPTION,
        importance: NotificationImportance.High)
  ]);
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
  Stream<bool>? _controller;
  String _message = EVENT_MESSAGE_DEFAULT;

  late StreamSubscription _subscription;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
    _permissionHandler();
    _initWatcher();
  }

  @override
  void dispose() {
    super.dispose();
    _subscription.cancel();
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.resumed && Platform.isAndroid) {
      _initWatcher();
    }
  }

  _permissionHandler() =>
      AwesomeNotifications().isNotificationAllowed().then((isAllowed) {
        if (!isAllowed) {
          // This is just a basic example. For real apps, you must show some
          // friendly dialog box before call the request method.
          // This is very important to not harm the user experience
          AwesomeNotifications().requestPermissionToSendNotifications();
        }
      });

  _initWatcher() {
    _controller ??= TimeChangeDetector().listener(calendarDayChanged: false);
    print(_message);
    _subscription = _controller!.listen((event) {
      setState(() => _message = '$EVENT_MESSAGE_SUCCESS: ${DateTime.now()}');
      createNotification(_message);
      print(_message);
    }, onError: (error) => print('$ERROR: $error'), onDone: () => print(STREAM_COMPLETE));
  }

  @override
  Widget build(BuildContext context) => MaterialApp(
      home: Scaffold(
          appBar: AppBar(title: const Text(APP_TITLE)),
          body: SafeArea(child: Center(child: Text(_message)))));
}

createNotification(String title) =>
    AwesomeNotifications().createNotification(
        content: NotificationContent(id: 10, channelKey: CHANNEL_KEY, title: title));

注意事项

• 插件目前不支持在应用完全关闭的情况下运行时间变化检测器。如果你有这方面的需求，可以考虑提交Pull Request或讨论实现方案。
• 如果你对插件有任何改进建议或发现Bug，请先开一个Issue进行讨论。

许可证

本插件采用MIT许可证。

希望这个示例能帮助你更好地理解和使用time_change_detector插件！如果有任何问题或需要进一步的帮助，请随时提问。