消除空间顶部和底部ListTile颤动

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('ListTile颤动解决示例')),
        body: ListView.builder(
          itemCount: 20,
          itemBuilder: (context, index) {
            return ListTile(
              key: ValueKey(index),
              leading: Icon(Icons.star),
              title: Text('Item $index'),
            );
          },
        ),
      ),
    );
  }
}