如果至少选中了一个复选框，如何激活按钮？- Flutter

import 'package:flutter/material.dart';

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  bool isChecked = false;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Activate Button'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Checkbox(
              value: isChecked,
              onChanged: (value) {
                setState(() {
                  isChecked = value!;
                });
              },
            ),
            ElevatedButton(
              onPressed: isChecked ? () {
                // 激活按钮的功能
                print('Button activated!');
              } : null,
              child: Text('Activate'),
            ),
          ],
        ),
      ),
    );
  }
}

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