如何在flutter中通过点击来访问网格元素？

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Grid View Example'),
        ),
        body: GridView.count(
          crossAxisCount: 2, // 每行显示的网格数量
          children: List.generate(4, (index) {
            return GestureDetector(
              onTap: () {
                // 处理点击事件
                print('点击了网格元素 $index');
              },
              child: Container(
                margin: EdgeInsets.all(10),
                color: Colors.blue,
                child: Center(
                  child: Text(
                    '网格元素 $index',
                    style: TextStyle(color: Colors.white, fontSize: 20),
                  ),
                ),
              ),
            );
          }),
        ),
      ),
    );
  }
}