如何在Flutter中增加和减少列表视图中的单个项目？

import 'package:flutter/material.dart';

class MyListView extends StatefulWidget {
  @override
  _MyListViewState createState() => _MyListViewState();
}

class _MyListViewState extends State<MyListView> {
  List<String> items = ['Item 1', 'Item 2', 'Item 3'];

  void addItem() {
    setState(() {
      items.add('New Item');
    });
  }

  void removeItem(int index) {
    setState(() {
      items.removeAt(index);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('List View Example'),
      ),
      body: ListView.builder(
        itemCount: items.length,
        itemBuilder: (context, index) {
          return ListTile(
            title: Text(items[index]),
            trailing: IconButton(
              icon: Icon(Icons.remove),
              onPressed: () {
                removeItem(index);
              },
            ),
          );
        },
      ),
      floatingActionButton: FloatingActionButton(
        child: Icon(Icons.add),
        onPressed: addItem,
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: MyListView(),
  ));
}