无法在ChatScreen flutter中获取用户聊天消息

// 示例代码使用Provider
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

class ChatModel with ChangeNotifier {
  List<String> _messages = [];
  List<String> get messages => _messages;

  void addMessage(String message) {
    _messages.add(message);
    notifyListeners();
  }
}

class ChatScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider(
      create: (context) => ChatModel(),
      child: Consumer<ChatModel>(
        builder: (context, chatModel, child) {
          return ListView.builder(
            itemCount: chatModel.messages.length,
            itemBuilder: (context, index) {
              return ListTile(title: Text(chatModel.messages[index]));
            },
          );
        },
      ),
    );
  }
}

// 示例代码使用FutureBuilder
class ChatScreen extends StatelessWidget {
  Future<List<String>> fetchMessages() async {
    // 模拟网络请求
    await Future.delayed(Duration(seconds: 2));
    return ['Hello', 'How are you?'];
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: FutureBuilder<List<String>>(
        future: fetchMessages(),
        builder: (context, snapshot) {
          if (snapshot.hasData) {
            return ListView.builder(
              itemCount: snapshot.data.length,
              itemBuilder: (context, index) {
                return ListTile(title: Text(snapshot.data[index]));
              },
            );
          } else if (snapshot.hasError) {
            return Text('Error: ${snapshot.error}');
          }
          return Center(child: CircularProgressIndicator());
        },
      ),
    );
  }
}