Flutter点对点通信插件p2plib_flutter的使用

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Flutter点对点通信插件p2plib_flutter的使用

简介

p2plib_flutter 是一个用于在 Flutter 应用中实现点对点通信的插件。它支持通过局域网或互联网进行设备间的直接通信。

安装

在 pubspec.yaml 文件中添加 p2plib_flutter 依赖：

dependencies:
  p2plib_flutter: ^1.0.0

然后运行 flutter pub get 来安装插件。

初始化插件

在应用启动时初始化 p2plib_flutter：

import 'package:p2plib_flutter/p2plib_flutter.dart';

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

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('P2P Communication Example')),
        body: Center(child: P2PCommunicationExample()),
      ),
    );
  }
}

class P2PCommunicationExample extends StatefulWidget {
  [@override](/user/override)
  _P2PCommunicationExampleState createState() => _P2PCommunicationExampleState();
}

class _P2PCommunicationExampleState extends State<P2PCommunicationExample> {
  [@override](/user/override)
  void initState() {
    super.initState();
    // 初始化插件
    P2PFlutter.init();
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Container();
  }
}

发送消息

发送消息到指定的目标设备：

Future<void> sendMessage(String targetDeviceId, String message) async {
  try {
    await P2PFlutter.sendMessage(targetDeviceId, message);
    print('Message sent to $targetDeviceId');
  } catch (e) {
    print('Failed to send message: $e');
  }
}

接收消息

监听接收到的消息：

[@override](/user/override)
void initState() {
  super.initState();
  // 初始化插件并设置消息接收回调
  P2PFlutter.init(onMessageReceived: (String from, String message) {
    print('Received message from $from: $message');
  });
}

查找其他设备

查找局域网内或互联网上的其他设备：

Future<void> findDevices() async {
  try {
    List<String> devices = await P2PFlutter.findDevices();
    print('Found devices: $devices');
  } catch (e) {
    print('Failed to find devices: $e');
  }
}

完整示例代码

import 'package:flutter/material.dart';
import 'package:p2plib_flutter/p2plib_flutter.dart';

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

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('P2P Communication Example')),
        body: Center(child: P2PCommunicationExample()),
      ),
    );
  }
}

class P2PCommunicationExample extends StatefulWidget {
  [@override](/user/override)
  _P2PCommunicationExampleState createState() => _P2PCommunicationExampleState();
}

class _P2PCommunicationExampleState extends State<P2PCommunicationExample> {
  String _message = '';
  String _targetDeviceId = '';

  [@override](/user/override)
  void initState() {
    super.initState();
    // 初始化插件并设置消息接收回调
    P2PFlutter.init(onMessageReceived: (String from, String message) {
      setState(() {
        _message = 'Received message from $from: $message';
      });
    });
  }

  void _sendMessage() async {
    if (_targetDeviceId.isNotEmpty) {
      await sendMessage(_targetDeviceId, 'Hello from Flutter!');
    }
  }

  Future<void> sendMessage(String targetDeviceId, String message) async {
    try {
      await P2PFlutter.sendMessage(targetDeviceId, message);
      setState(() {
        _message = 'Message sent to $targetDeviceId';
      });
    } catch (e) {
      setState(() {
        _message = 'Failed to send message: $e';
      });
    }
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        ElevatedButton(
          onPressed: findDevices,
          child: Text('Find Devices'),
        ),
        TextField(
          onChanged: (value) => _targetDeviceId = value,
          decoration: InputDecoration(hintText: 'Enter Target Device ID'),
        ),
        ElevatedButton(
          onPressed: _sendMessage,
          child: Text('Send Message'),
        ),
        Text(_message),
      ],
    );
  }
}