Flutter网络连接状态检测插件connection_status的使用

获取开始

Android 设置

在你的 AndroidManifest.xml 文件中添加以下内容以获取互联网权限。

<uses-permission android:name="android.permission.INTERNET" />

使用示例

以下是一个完整的示例，展示了如何使用 connection_status 插件来检测网络连接状态。

示例代码

import 'dart:developer';

import 'package:connection_status/connection_status.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      builder: (context, child) {
        // 使用 ConnectionWidget 来监听网络状态
        return ConnectionWidget(
          dismissOfflineBanner: true, // 是否关闭离线提示栏
          offlineCallback: () => log('offline'), // 离线回调函数
          onlineCallback: () => log('back online'), // 在线回调函数
          builder: (BuildContext context, bool isOnline) {
            return child!;
          },
        );
      },
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    log('increment'); // 记录点击事件
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              '你已经点击按钮次数:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: '增加',
        child: const Icon(Icons.add),
      ),
    );
  }
}

代码解释

1. 导入必要的库:

   import 'dart:log';
   import 'package:connection_status/connection_status.dart';
   import 'package:flutter/material.dart';
   

2. 定义 MyApp 类:

   class MyApp extends StatelessWidget {
     const MyApp({Key? key}) : super(key: key);
   
     @override
     Widget build(BuildContext context) {
       return MaterialApp(
         title: 'Flutter Demo',
         builder: (context, child) {
           // 使用 ConnectionWidget 监听网络状态
           return ConnectionWidget(
             dismissOfflineBanner: true, // 关闭离线提示栏
             offlineCallback: () => log('offline'), // 离线回调函数
             onlineCallback: () => log('back online'), // 在线回调函数
             builder: (BuildContext context, bool isOnline) {
               return child!;
             },
           );
         },
         theme: ThemeData(
           primarySwatch: Colors.blue,
         ),
         home: const MyHomePage(title: 'Flutter Demo Home Page'),
       );
     }
   }
   

3. 定义 MyHomePage 类:

   class MyHomePage extends StatefulWidget {
     const MyHomePage({Key? key, required this.title}) : super(key: key);
   
     final String title;
   
     @override
     State<MyHomePage> createState() => _MyHomePageState();
   }
   
   class _MyHomePageState extends State<MyHomePage> {
     int _counter = 0;
   
     void _incrementCounter() {
       log('increment'); // 记录点击事件
       setState(() {
         _counter++;
       });
     }
   
     @override
     Widget build(BuildContext context) {
       return Scaffold(
         appBar: AppBar(
           title: Text(widget.title),
         ),
         body: Center(
           child: Column(
             mainAxisAlignment: MainAxisAlignment.center,
             children: <Widget>[
               const Text(
                 '你已经点击按钮次数:',
               ),
               Text(
                 '$_counter',
                 style: Theme.of(context).textTheme.headlineMedium,
               ),
             ],
           ),
         ),
         floatingActionButton: FloatingActionButton(
           onPressed: _incrementCounter,
           tooltip: '增加',
           child: const Icon(Icons.add),
         ),
       );
     }
   }