如何在颤动中滚动时解决应用冻结

Question

我正在设置一个具有内部水平listview的布局
布局结构如下
容器-父级
  ListView Builder-外部列表
     SizedBox-外部列表项目
        ListView-水平内部列表视图

即时通讯在垂直或水平滚动时，我的应用程序冻结并停止 它说异常暂停
我收到这个错误 Click here

我是扑朔迷离的初学者，对不起编码结构 以下是我的代码

import 'package:flutter/material.dart';
import 'package:http/http.dart';
import 'dart:convert';
import 'package:cached_network_image/cached_network_image.dart';

class Categories extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return CategoriesState();
  }
}

class CategoriesState extends State<Categories>
    with TickerProviderStateMixin, AutomaticKeepAliveClientMixin {
  List categories = new List();
  bool showProgress = true;
  @override
  void initState() {
    super.initState();
    getJson();
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      child: showProgress == false
          ? new ListView.builder(
              itemCount: categories.length,
              itemBuilder: (BuildContext context, int categoryIndex) {
                return SizedBox(
                  width: MediaQuery.of(context).size.width,
                  height: 200,
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    mainAxisSize: MainAxisSize.min,
                    children: <Widget>[
                      Padding(
                        padding: EdgeInsets.all(16),
                        child: Text(
                          categories[categoryIndex]["category"],
                          style: TextStyle(fontFamily: "Ubuntu", fontSize: 18),
                        ),
                      ),
                      Flexible(
                        child: new ListView.builder(
                            scrollDirection: Axis.horizontal,
                            itemCount:
                                categories[categoryIndex]["subcategory"].length,
                            itemBuilder: (BuildContext context, int index) {
                              return Stack(
                                children: <Widget>[
                                  Center(
                                      child: Text(categories[categoryIndex]
                                          ["subcategory"][index]["name"])),
                                  Image(
                                    height:100,
                                    width:200,
                                    image:new CachedNetworkImageProvider(categories[categoryIndex]
                                          ["subcategory"][index]["url"])
                                  )
                                ],
                              );
                            }),
                      )
                    ],
                  ),
                );
              })
          : Center(
              child: CircularProgressIndicator(),
            ),
    );
  }

  @override
  // TODO: implement wantKeepAlive
  bool get wantKeepAlive => true;

  void getJson() async {
    final data =
        await DefaultAssetBundle.of(context).loadString('assets/data.json');
    var decoded = json.decode(data);
    print(decoded);
    setState(() {
      showProgress = false;
      categories = decoded as List;
    });
  }
}