Flutter聊天流程管理插件flutter

Flutter聊天流程管理插件flutter_chatflow的使用

插件介绍

Flutter聊天流程管理插件flutter_chatflow是一个强大的、灵活的聊天解决方案，适用于Flutter应用程序。它提供了实时消息传递、私聊、群聊、自定义UI、用户管理、媒体共享、丰富的文本支持、用户打字事件监听等功能。

安装和使用示例

import 'package:flutter/material.dart';
import 'package:flutter_chatflow/chatflow.dart';
import 'package:flutter_chatflow/models.dart';
import 'package:flutter_chatflow/notifier.dart';
import 'package:flutter_chatflow/utils/types.dart';
import 'package:flutter_chatflow/widgets/image/image_upload_preview_with_text_input.dart';
import 'package:flutter_chatflow/widgets/media_selection_with_text.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: ChatScreen(),
    );
  }
}

class ChatScreen extends StatelessWidget {

  List<Message> _messages = [];
  ChatUser author = ChatUser({
    /// It should be unique and persistent for each user
    userID: 'randomID'
  })

  void _addMessage(Message message) {
    /// Handle sending message to server

    /// Sending to local collection below [OPTIONAL if sent to server and listened correctly]
    setState((){
      _messages.insert(0, message);
    });
  }

  void _handleSendPressed(String message, {Message? repliedTo}) {
    int createdAt = DateTime.now().millisecondsSinceEpoch;
    
    final textMessage = TextMessage(
      author: author,
      createdAt: createdAt,
      text: message,
      status: DeliveryStatus.sending
    );

    _addMessage(textMessage);
  }

  void _handleOnAttachmentPressed({Message? repliedTo}) async {
    /// Logic for adding image to chat.
    /// You could use a dialog to choose between different media types
    /// And rename the function accordingly
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Chat')),
      body: ChatFlow(
        messages: _messages,
        chatUser: author,
        onSendPressed: _handleSendPressed,
        onAttachmentPressed: _handleOnAttachmentPressed
      ),
    );
  }
}

示例代码解析

导入必要的包：

import 'package:flutter/material.dart';
import 'package:flutter_chatflow/chatflow.dart';
import 'package:flutter_chatflow/models.dart';
import 'package:flutter_chatflow/notifier.dart';
import 'package:flutter_chatflow/utils/types.dart';
import 'package:flutter_chatflow/widgets/image/image_upload_preview_with_text_input.dart';
import 'package:flutter_chatflow/widgets/media_selection_with_text.dart';

主函数：
```
void main() {
  runApp(MyApp());
}
```
这里创建了一个简单的的应用程序实例，并将其作为主入口点。

应用类：

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: ChatScreen(),
    );
  }
}

创建一个MyApp类，其中包含一个home属性指向ChatScreen。

聊天屏幕类：

class ChatScreen extends StatelessWidget {

  List<Message> _messages = [];
  ChatUser author = ChatUser({
    /// It should be unique and persistent for each user
    userID: 'randomID'
  })

  void _addMessage(Message message) {
    /// Handle send message to server

    /// Sending to local collection below [OPTIONAL if sent to server and listened correctly]
    setState((){
      _messages.insert(0, message);
    });
  }

  void _handleSendPressed(String message, {Message? repliedTo}) {
    int createdAt = DateTime.now().millisecondsSinceEpoch;
    
    final textMessage = TextMessage(
      author: author,
      createdAt: createdAt,
      text: message,
      status: DeliveryStatus.sending
    );

    _addMessage(textMessage);
  }

  void _handleOnAttachmentPressed({Message? repliedTo}) async {
    /// Logic for adding image to chat.
    /// You could use a dialog to choose between different media types
    /// And rename the function accordingly
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Chat')),
      body: ChatFlow(
        messages: _messages,
        chatUser: author,
        onSendPressed: _handleSendPressed,
        onAttachmentPressed: _handleOnAttachmentPressed
      ),
    );
  }
}

在这里定义了ChatScreen类，用于显示聊天界面。包括添加消息、发送消息、处理附件等逻辑。

ChatFlow组件：

return ChatFlow(
  messages: _messages,
  chatUser: author,
  onSendPressed: _handleSendPressed,
  onAttachmentPressed: _handleOnAttachmentPressed
),

更多关于Flutter聊天流程管理插件flutter_chatflow的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

wuwangju 1楼•5 天前

更多关于Flutter聊天流程管理插件flutter_chatflow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，下面是一个关于如何使用 flutter_chatflow 插件来管理聊天流程的示例代码。这个插件假设已经安装并配置在你的 Flutter 项目中。

1. 安装 `flutter_chatflow`

首先，确保你已经在 pubspec.yaml 文件中添加了 flutter_chatflow 依赖：

dependencies:
  flutter:
    sdk: flutter
  flutter_chatflow: ^最新版本号

然后运行 flutter pub get 来获取依赖。

2. 初始化聊天流程管理

在你的 Flutter 应用中，你需要初始化 ChatFlow 实例，并设置相关的参数。以下是一个简单的初始化示例：

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter ChatFlow Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: ChatFlowDemo(),
    );
  }
}

class ChatFlowDemo extends StatefulWidget {
  @override
  _ChatFlowDemoState createState() => _ChatFlowDemoState();
}

class _ChatFlowDemoState extends State<ChatFlowDemo> {
  late ChatFlow chatFlow;

  @override
  void initState() {
    super.initState();
    // 初始化 ChatFlow
    chatFlow = ChatFlow(
      user: User(
        id: 'user123',
        name: 'John Doe',
        avatarUrl: 'https://example.com/avatar.png',
      ),
      onMessageSent: (message) {
        // 处理消息发送逻辑
        print('Message sent: $message');
      },
      onMessageReceived: (message) {
        // 处理消息接收逻辑
        print('Message received: $message');
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('ChatFlow Demo'),
      ),
      body: ChatScreen(chatFlow: chatFlow),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          // 发送示例消息
          chatFlow.sendMessage(
            text: 'Hello, how are you?',
            sender: chatFlow.user, // 这里假设是当前用户发送消息
          );
        },
        tooltip: 'Send message',
        child: Icon(Icons.send),
      ),
    );
  }
}

class ChatScreen extends StatefulWidget {
  final ChatFlow chatFlow;

  ChatScreen({required this.chatFlow});

  @override
  _ChatScreenState createState() => _ChatScreenState();
}

class _ChatScreenState extends State<ChatScreen> {
  late List<Message> messages;

  @override
  void initState() {
    super.initState();
    messages = []; // 初始化消息列表
    // 监听消息更新
    widget.chatFlow.messageStream.listen((message) {
      setState(() {
        messages.add(message);
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: messages.length,
      itemBuilder: (context, index) {
        final message = messages[index];
        return Padding(
          padding: const EdgeInsets.all(8.0),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(
                message.sender.name,
                style: TextStyle(fontSize: 12, color: Colors.grey),
              ),
              Text(
                message.text,
                style: TextStyle(fontSize: 16),
              ),
            ],
          ),
        );
      },
    );
  }
}

class User {
  final String id;
  final String name;
  final String avatarUrl;

  User({required this.id, required this.name, required this.avatarUrl});
}

class Message {
  final User sender;
  final String text;

  Message({required this.sender, required this.text});
}

3. 功能说明

初始化 ChatFlow：在 initState 方法中初始化 ChatFlow 实例，并设置用户信息和消息回调。
发送消息：在 floatingActionButton 的点击事件中调用 chatFlow.sendMessage 方法发送消息。
接收消息：通过监听 chatFlow.messageStream 来接收新消息，并更新消息列表。
显示消息：在 ChatScreen 中使用 ListView.builder 来显示消息列表。

请注意，这只是一个简单的示例，实际应用中可能需要处理更多的细节，比如网络连接、消息状态（发送中、已发送、已读、未读）、用户认证等。flutter_chatflow 插件可能提供了更丰富的功能，具体可以参考其官方文档和示例代码。

Flutter聊天流程管理插件flutter_chatflow的使用