如何在选中时更改raisedButton的颜色

import 'package:flutter/material.dart';

class MyButton extends StatefulWidget {
  @override
  _MyButtonState createState() => _MyButtonState();
}

class _MyButtonState extends State<MyButton> {
  bool isSelected = false;

  @override
  Widget build(BuildContext context) {
    return RaisedButton(
      color: isSelected ? Colors.blue : Colors.grey, // 根据isSelected状态设置按钮的颜色
      onPressed: () {
        setState(() {
          isSelected = !isSelected; // 切换按钮的选中状态
        });
      },
      child: Text('按钮'),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: Scaffold(
      appBar: AppBar(
        title: Text('按钮示例'),
      ),
      body: Center(
        child: MyButton(),
      ),
    ),
  ));
}