Flutter：flutter_local_notifications——消息推送的学习

在Flutter中，flutter_local_notifications插件可以用来处理本地通知，这对于学习如何在应用中实现消息推送是一个很好的资源。以下是一个简单的例子，展示如何设置和使用flutter_local_notifications插件。

首先，在你的pubspec.yaml文件中添加flutter_local_notifications依赖：

dependencies:
  flutter:
    sdk: flutter
  flutter_local_notifications: ^9.0.0

然后，运行flutter pub get来安装依赖。

接下来，你可以使用以下代码来设置并展示一个本地通知：

import 'package:flutter/material.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
 
void main() {
  runApp(MyApp());
}
 
class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomePage(),
    );
  }
}
 
class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}
 
class _HomePageState extends State<HomePage> {
  FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
      FlutterLocalNotificationsPlugin();
 
  @override
  void initState() {
    super.initState();
    initialiseNotifications();
  }
 
  // 初始化通知设置
  initialiseNotifications() {
    var initializationSettingsAndroid =
        AndroidInitializationSettings('app_icon');
    var initializationSettingsIOS = IOSInitializationSettings();
    var initializationSettings = InitializationSettings(
        android: initializationSettingsAndroid, iOS: initializationSettingsIOS);
 
    flutterLocalNotificationsPlugin.initialize(initializationSettings,
        onSelectNotification: onSelectNotification);
  }
 
  // 当用户点击通知时调用的回调
  onSelectNotification(String payload) {
    if (payload != null) {
      debugPrint('Notification payload: ' + payload);
    }
  }
 
  // 展示通知
  showNotification() async {
    var androidPlatformChannelSpecifics = AndroidNotificationDetails(
        'channel_id', 'channel_name', 'channel_description',
        importance: Importance.max, priority: Priority.high);
    var iOSPlatformChannelSpecifics = IOSNotificationDetails();
    var platformChannelSpecifics = NotificationDetails(
        android: androidPlatformChannelSpecifics,
        iOS: iOSPlatformChannelSpecifics);
    await flutterLocalNotificationsPlugin.show(
        0, 'New Notification', 'This is a test notification', platformChannelSpecifics,
        payload: 'Test payload');
  }
 
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(