Flutter即时通讯插件chat的使用

在本教程中，我们将展示如何在Flutter项目中使用即时通讯插件来实现聊天功能。我们将提供一个完整的示例代码，帮助您快速上手。

1. 添加依赖

首先，在pubspec.yaml文件中添加flutter_chat_ui依赖：

dependencies:
  flutter_chat_ui: ^0.1.0

然后运行以下命令以安装依赖：

flutter pub get

2. 初始化插件

在main.dart文件中初始化插件并创建基本的聊天界面。

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

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

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

3. 创建聊天屏幕

接下来，创建一个名为ChatScreen的屏幕，并使用FlutterChatUI组件来构建聊天界面。

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

class _ChatScreenState extends State<ChatScreen> {
  final List<Map<String, dynamic>> _messages = [];

  void _sendMessage({String text = ''}) {
    setState(() {
      _messages.insert(0, {'text': text});
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('即时通讯'),
      ),
      body: Chat(
        messages: _messages.map((msg) => MessageItem(text: msg['text'])).toList(),
        onSendPressed: _sendMessage,
        user: User(id: 'uniqueId', name: '你'),
      ),
    );
  }
}

4. 自定义消息项

为了更好地展示消息，我们可以自定义消息项。创建一个MessageItem类来表示消息。

class MessageItem extends StatelessWidget {
  final String text;

  const MessageItem({Key? key, required this.text}) : super(key: key);

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Container(
      margin: EdgeInsets.symmetric(vertical: 10),
      child: Row(
        children: [
          Text(text),
        ],
      ),
    );
  }
}

完整示例代码

以下是完整的示例代码：

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

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

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

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

class _ChatScreenState extends State<ChatScreen> {
  final List<Map<String, dynamic>> _messages = [];

  void _sendMessage({String text = ''}) {
    setState(() {
      _messages.insert(0, {'text': text});
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('即时通讯'),
      ),
      body: Chat(
        messages: _messages.map((msg) => MessageItem(text: msg['text'])).toList(),
        onSendPressed: _sendMessage,
        user: User(id: 'uniqueId', name: '你'),
      ),
    );
  }
}

class MessageItem extends StatelessWidget {
  final String text;

  const MessageItem({Key? key, required this.text}) : super(key: key);

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Container(
      margin: EdgeInsets.symmetric(vertical: 10),
      child: Row(
        children: [
          Text(text),
        ],
      ),
    );
  }
}