ListView(  // Setting `shrinkWrap` to `true` here is both unnecessary and expensive.  children: <Widget>[    ListView.builder(      itemCount: list1Children.length,      itemBuilder: (BuildContext context, int index) {        return list1Children[index];      },      // This forces the `ListView` to build all of its children up front,      // negating much of the benefit of using `ListView.builder`.      shrinkWrap: true,    ),    ListView.builder(      itemCount: list2Children.length,      itemBuilder: (BuildContext context, int index) {        return list2Children[index];      },      // This forces the `ListView` to build all of its children up front,      // negating much of the benefit of using `ListView.builder`.      shrinkWrap: true,    ),    ...  ],)

import 'package:flutter/material.dart';import 'dart:math' as math;​void main() {  runApp(ShrinkWrApp());}​class ShrinkWrApp extends StatelessWidget {  @override  Widget build(BuildContext context) {    return MaterialApp(      debugShowCheckedModeBanner: false,      title: 'ShrinkWrap vs Slivers',      home: Scaffold(        appBar: AppBar(          title: const Text("ShrinkWrap, Street Rat, I don't, Buy that!"),        ),        body: const ShrinkWrapSlivers(),      ),    );  }}​class ShrinkWrapSlivers extends StatefulWidget {  const ShrinkWrapSlivers({    Key? key,  }) : super(key: key);​  @override  _ShrinkWrapSliversState createState() => _ShrinkWrapSliversState();}​class _ShrinkWrapSliversState extends State<ShrinkWrapSlivers> {  List<ListView> innerLists = [];  final numLists = 15;  final numberOfItemsPerList = 100;​  @override  void initState() {    super.initState();    for (int i = 0; i < numLists; i++) {      final _innerList = <ColorRow>[];      for (int j = 0; j < numberOfItemsPerList; j++) {        _innerList.add(const ColorRow());      }      innerLists.add(        ListView.builder(          itemCount: numberOfItemsPerList,          itemBuilder: (BuildContext context, int index) => _innerList[index],          shrinkWrap: true,          physics: const NeverScrollableScrollPhysics(),        ),      );    }  }​  @override  Widget build(BuildContext context) {    return ListView.builder(        itemCount: numLists,        itemBuilder: (context, index) => innerLists[index]);  }}​@immutableclass ColorRow extends StatefulWidget {  const ColorRow({Key? key}) : super(key: key);​  @override  State createState() => ColorRowState();}​class ColorRowState extends State<ColorRow> {  Color? color;​  @override  void initState() {    super.initState();    color = randomColor();  }​  @override  Widget build(BuildContext context) {    print('Building ColorRowState');    return Container(      decoration: BoxDecoration(        gradient: LinearGradient(          begin: Alignment.topLeft,          end: Alignment.bottomRight,          colors: [            randomColor(),            randomColor(),          ],        ),      ),      child: Row(        children: <Widget>[          Padding(            padding: const EdgeInsets.all(8.0),            child: Container(height: 50, width: 50, color: Colors.white),          ),          Flexible(            child: Column(              children: const <Widget>[                Padding(                  padding: EdgeInsets.all(8),                  child: Text('这里是 坚果前端小课堂!',                      style: TextStyle(color: Colors.white)),                ),              ],            ),          ),        ],      ),    );  }}​Color randomColor() =>    Color((math.Random().nextDouble() * 0xFFFFFF).toInt()).withOpacity(1.0);​