ListView中的Navigator.push，ListTile不工作

import 'package:flutter/material.dart';

class MyListView extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: 10,
      itemBuilder: (BuildContext context, int index) {
        return Builder(
          builder: (BuildContext context) {
            return GestureDetector(
              onTap: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(builder: (context) => NextPage()),
                );
              },
              child: ListTile(
                title: Text('Item $index'),
              ),
            );
          },
        );
      },
    );
  }
}

class NextPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Next Page'),
      ),
      body: Center(
        child: Text('This is the next page.'),
      ),
    );
  }
}