Flutter WebRTC网状网络通信插件webrtc_mesh的使用

功能

✅ 跨平台支持
✅ 自定义信令服务器支持（包括Firestore）
✅ 多房间支持
✅ 数据通道流
✅ 自动连接/断开处理

使用方法

请查看 /example 文件夹中的完整示例。

对于一个完整的群聊示例，可以参考 WebRTCMesh-GC。

一个简单的聊天应用示例：

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

import 'firestore_signalling.dart';

class ChatScreen extends StatefulWidget {
  final String roomId;
  final WebRTCMesh webRTCMesh;

  ChatScreen({Key? key, required this.roomId})
      : webRTCMesh = WebRTCMesh<FirestoreSignalling>(
          roomID: 'roomId',
          signallingCreator: (roomId, localPeerID) =>
              FirestoreSignalling(roomId: roomId, localPeerID: localPeerID),
        ),
        super(key: key);

  [@override](/user/override)
  State<ChatScreen> createState() => _ChatScreenState();
}

class _ChatScreenState extends State<ChatScreen> {
  final _messages = <Message>[];
  final TextEditingController _textController = TextEditingController();

  [@override](/user/override)
  void dispose() {
    super.dispose();
    widget.webRTCMesh.dispose();
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        children: [
          Expanded(
            child: StreamBuilder<Message>(
              stream: widget.webRTCMesh.messageStream.stream,
              builder: (context, snapshot) {
                if (snapshot.hasError) {
                  return Center(
                    child: Text('Error: ${snapshot.error}'),
                  );
                }

                if (!snapshot.hasData) {
                  return const Center(
                    child: Text('No messages yet'),
                  );
                }

                _messages.add(snapshot.data!);

                return ListView.builder(
                  itemCount: _messages.length,
                  itemBuilder: (BuildContext context, int index) {
                    final message = _messages[index];
                    return ListTile(
                      title: Text(message.message ?? ''),
                      subtitle: Text(message.from),
                      trailing: Text(message.type),
                    );
                  },
                );
              }
            ),
          ),
        ],
      ),
    );
  }
}

额外信息

这是WebRTC Mesh网络协议的信令概述。

WebRTC 信令

完整示例代码

以下是完整的示例代码，展示了如何使用 webrtc_mesh 插件创建一个简单的聊天应用。

import 'package:flutter/material.dart';
import 'package:webrtc_mesh/webrtc_mesh.dart';
import 'firestore_signalling.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  // await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform);
  runApp(const MyApp());
}

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

  [@override](/user/override)
  Widget build(BuildContext context) => MaterialApp(
        debugShowCheckedModeBanner: false,
        title: "WebRTC Mesh Example",
        home: ChatScreen(roomId: 'roomId'),
      );
}

class ChatScreen extends StatefulWidget {
  final String roomId;
  final WebRTCMesh webRTCMesh;

  ChatScreen({Key? key, required this.roomId})
      : webRTCMesh = WebRTCMesh<FirestoreSignalling>(
          roomID: 'roomId',
          signallingCreator: (roomId, localPeerID) =>
              FirestoreSignalling(roomId: roomId, localPeerID: localPeerID),
        ),
        super(key: key);

  [@override](/user/override)
  State<ChatScreen> createState() => _ChatScreenState();
}

class _ChatScreenState extends State<ChatScreen> {
  final _messages = <Message>[];
  final TextEditingController _textController = TextEditingController();

  [@override](/user/override)
  void dispose() {
    super.dispose();
    widget.webRTCMesh.dispose();
  }

  void _sendMessage(String message) {
    widget.webRTCMesh.printPeers();
    final messageText = _textController.text.trim();
    if (messageText.isNotEmpty) {
      widget.webRTCMesh.sendToAllPeers(messageText);
      widget.webRTCMesh.messageStream.add(Message(
        message: messageText,
        type: 'text',
        from: widget.webRTCMesh.localPeerID,
      ));
      _textController.clear();
    }
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        centerTitle: true,
        actions: [
          IconButton(
            icon: const Icon(Icons.info_outline),
            onPressed: () {
              widget.webRTCMesh.printPeers();
            },
          ),
        ],
        title: Row(
          children: [
            Text('Room ${widget.roomId}',
                style: Theme.of(context).textTheme.titleLarge),
            const Spacer(),
          ],
        ),
      ),
      body: Column(
        children: [
          Expanded(
            child: StreamBuilder<Message>(
              stream: widget.webRTCMesh.messageStream.stream,
              builder: (context, snapshot) {
                if (snapshot.hasError) {
                  return Center(
                    child: Text('Error: ${snapshot.error}'),
                  );
                }

                if (!snapshot.hasData) {
                  return const Center(
                    child: Text('No messages yet'),
                  );
                }

                _messages.add(snapshot.data!);

                return ListView.builder(
                  itemCount: _messages.length,
                  itemBuilder: (BuildContext context, int index) {
                    final message = _messages[index];
                    return ListTile(
                      title: Text(message.message ?? ''),
                      subtitle: Text(message.from),
                      trailing: Text(message.type),
                    );
                  },
                );
              },
            ),
          ),
          Container(
            margin: const EdgeInsets.symmetric(horizontal: 8.0),
            child: Row(
              children: [
                Expanded(
                  child: TextField(
                    controller: _textController,
                    decoration: const InputDecoration(
                      hintText: 'Enter your message',
                    ),
                  ),
                ),
                IconButton(
                  icon: const Icon(Icons.send),
                  onPressed: () {
                    _sendMessage(_textController.text);
                  },
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }
}

更多关于Flutter WebRTC网状网络通信插件webrtc_mesh的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

bupafengyu 1楼•4 天前

更多关于Flutter WebRTC网状网络通信插件webrtc_mesh的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

当然，以下是一个关于如何在Flutter项目中使用webrtc_mesh插件来实现网状（Mesh）网络通信的示例代码。这个示例将展示如何初始化WebRTC连接、加入房间、管理对等连接以及发送和接收数据。

首先，确保你的Flutter项目中已经添加了webrtc_mesh依赖。在pubspec.yaml文件中添加以下依赖：

dependencies:
  flutter:
    sdk: flutter
  webrtc_mesh: ^最新版本号  # 请替换为实际可用的最新版本号

然后，运行flutter pub get来安装依赖。

接下来，我们编写Flutter代码来演示如何使用webrtc_mesh插件。

main.dart

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

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final String roomName = 'test_room';
  WebRTCMesh? webrtcMesh;
  bool isConnected = false;

  @override
  void initState() {
    super.initState();
    initWebRTC();
  }

  void initWebRTC() async {
    webrtcMesh = WebRTCMesh(
      roomName: roomName,
      onSignal: (signal) {
        // 在这里处理接收到的信令数据，通常你需要将其发送到服务器或其他对等端
        print('Received signal: $signal');
      },
      onIceCandidate: (candidate) {
        // 在这里处理ICE候选者，同样需要将其发送到服务器或其他对等端
        print('Received ICE candidate: $candidate');
      },
      onConnected: () {
        setState(() {
          isConnected = true;
        });
        print('Connected to the room');
      },
      onDisconnected: () {
        setState(() {
          isConnected = false;
        });
        print('Disconnected from the room');
      },
      onMessage: (message) {
        // 接收来自其他对等端的数据消息
        print('Received message: $message');
      },
    );

    // 初始化WebRTC并加入房间
    await webrtcMesh!.joinRoom();
  }

  void sendMessage(String message) async {
    if (webrtcMesh != null && isConnected) {
      await webrtcMesh!.sendMessage(message);
    } else {
      print('WebRTC is not initialized or not connected');
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('WebRTC Mesh Example'),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Text(
                isConnected ? 'Connected' : 'Not Connected',
                style: TextStyle(fontSize: 24),
              ),
              SizedBox(height: 20),
              TextField(
                decoration: InputDecoration(
                  border: OutlineInputBorder(),
                  labelText: 'Enter message',
                ),
                onChanged: (value) async {
                  // 当用户按下发送按钮时发送消息
                  if (value.isNotEmpty &&
                      (context.findAncestorStateOfType<_MessageFormState>()
                              as _MessageFormState?)!
                          .isSending) {
                    await sendMessage(value);
                  }
                },
              ),
              SizedBox(height: 10),
              _MessageForm(),
            ],
          ),
        ),
      ),
    );
  }
}

class _MessageForm extends StatefulWidget {
  @override
  _MessageFormState createState() => _MessageFormState();
}

class _MessageFormState extends State<_MessageForm> {
  bool isSending = false;

  @override
  Widget build(BuildContext context) {
    return ElevatedButton(
      onPressed: () async {
        setState(() {
          isSending = true;
        });
        final TextEditingController controller =
            TextEditingController.fromValue(
                TextEditingValue(text: (context.findAncestorWidgetOfExactType<TextField>()
                        as TextField?)!
                    .controller!
                    .value));
        await (context.findAncestorStateOfType<MyAppState>() as _MyAppState)
            .sendMessage(controller.text);
        controller.clear();
        setState(() {
          isSending = false;
        });
      },
      child: Text('Send'),
    );
  }
}

注意事项

信令服务器：上述代码示例假设你已经有一个信令服务器来处理对等端之间的信令交换。在实际应用中，你需要将接收到的信令和ICE候选者发送到服务器，并从服务器接收其他对等端的信令和ICE候选者。
权限：确保在AndroidManifest.xml和Info.plist中添加了必要的权限，如麦克风和摄像头权限。
错误处理：为了简洁，上述代码省略了错误处理逻辑。在实际应用中，你需要添加适当的错误处理来确保应用的健壮性。
依赖版本：请确保使用webrtc_mesh插件的最新版本，并查阅其官方文档以获取最新的API和用法指南。

这个示例提供了一个基本的框架，你可以根据实际需求进行扩展和修改。