如何在flutter中访问GridView中特定项目的索引？

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('GridView Index Example'),
        ),
        body: GridView.builder(
          itemCount: 100, // 假设有100个项目
          gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
            crossAxisCount: 3, // 每行显示3个项目
            childAspectRatio: 1.0, // 子Widget的宽高比
          ),
          itemBuilder: (context, index) {
            return GestureDetector(
              onTap: () {
                print('Clicked item at index: $index');
              },
              child: Container(
                padding: EdgeInsets.all(10),
                color: Colors.blue[100],
                child: Center(child: Text('Item $index')),
              ),
            );
          },
        ),
      ),
    );
  }
}