如何在Flutter应用上显示丰富的消息，如Google-Assistant-output Basic Card

dependencies:
  flutter:
    sdk: flutter
  flutter_dialogflow: ^0.2.6
  flutter_card_swipper: ^1.0.0

import 'package:flutter/material.dart';
import 'package:flutter_dialogflow/dialogflow_v2.dart';
import 'package:flutter_card_swiper/flutter_card_swiper.dart';

class RichMessagePage extends StatefulWidget {
  @override
  _RichMessagePageState createState() => _RichMessagePageState();
}

class _RichMessagePageState extends State<RichMessagePage> {
  List<Card> cards = [];

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

  void fetchRichMessages() async {
    // 使用Dialogflow或其他机器学习平台获取丰富的消息数据
    // 这里使用flutter_dialogflow库来演示
    AuthGoogle authGoogle = await AuthGoogle(
      fileJson: "assets/your_dialogflow_credentials.json",
    ).build();
    Dialogflow dialogflow = Dialogflow(authGoogle: authGoogle, language: Language.english);
    AIResponse response = await dialogflow.detectIntent("你的用户输入");

    // 解析Dialogflow的响应并创建卡片
    List<dynamic> messages = response.getListMessage();
    for (var message in messages) {
      if (message['message'] == 'card') {
        Card card = Card(
          title: message['title'],
          subtitle: message['subtitle'],
          image: message['image'],
          buttons: message['buttons'],
        );
        cards.add(card);
      }
    }

    setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('丰富的消息'),
      ),
      body: Center(
        child: Swiper(
          itemBuilder: (BuildContext context, int index) {
            return CardWidget(
              title: cards[index].title,
              subtitle: cards[index].subtitle,
              image: cards[index].image,
              buttons: cards[index].buttons,
            );
          },
          itemCount: cards.length,
          pagination: SwiperPagination(),
          control: SwiperControl(),
        ),
      ),
    );
  }
}

class Card {
  final String title;
  final String subtitle;
  final String image;
  final List<dynamic> buttons;

  Card({this.title, this.subtitle, this.image, this.buttons});
}

class CardWidget extends StatelessWidget {
  final String title;
  final String subtitle;
  final String image;
  final List<dynamic> buttons;

  CardWidget({this.title, this.subtitle, this.image, this.buttons});

  @override
  Widget build(BuildContext context) {
    return Container(
      margin: EdgeInsets.all(10.0),
      padding: EdgeInsets.all(10.0),
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(10.0),
        color: Colors.white,
        boxShadow: [
          BoxShadow(
            color: Colors.grey.withOpacity(0.5),
            spreadRadius: 2,
            blurRadius: 5,
            offset: Offset(0, 3),
          ),
        ],
      ),
      child: Column(
        children: [
          if (image != null) Image.network(image),
          if (title != null) Text(title, style: TextStyle(fontSize: 20.0, fontWeight: FontWeight.bold)),
          if (subtitle != null) Text(subtitle),
          if (buttons != null)
            Column(
              children: buttons.map((button) {
                return RaisedButton(
                  onPressed: () {
                    // 处理按钮点击事件
                  },
                  child: Text(button['text']),
                );
              }).toList(),
            ),
        ],
      ),
    );
  }
}

Navigator.push(
  context,
  MaterialPageRoute(builder: (context) => RichMessagePage()),
);