如何在flutter中点击卡片项时动态创建Listview？

import 'package:flutter/material.dart';

class MyCard extends StatefulWidget {
  @override
  _MyCardState createState() => _MyCardState();
}

class _MyCardState extends State<MyCard> {
  int selectedCardIndex = -1; // 初始值为-1，表示没有选中任何卡片项

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: 5, // 假设有5个卡片项
      itemBuilder: (context, index) {
        return Card(
          color: selectedCardIndex == index ? Colors.blue : Colors.white,
          child: ListTile(
            title: Text('Card $index'),
            onTap: () {
              setState(() {
                selectedCardIndex = index; // 更新选中的卡片项索引
              });
            },
          ),
        );
      },
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: Scaffold(
      appBar: AppBar(
        title: Text('Dynamic ListView'),
      ),
      body: MyCard(),
    ),
  ));
}