我试图做一个滚动屏幕，我可以有每个不同的图像垂直与一些功能，如星星评定栏，也许几个按钮。我首先尝试插入一张照片到滚动屏幕。这里是我的代码：'

Widget build(BuildContext context) {
  return Scaffold(
    body: CustomScrollView(
      slivers: <Widget>[
        SliverAppBar(
          expandedHeight:250,
          pinned: true,
          floating: true,
          flexibleSpace: FlexibleSpaceBar(
            background: Container(
              padding: EdgeInsets.symmetric(horizontal: AppLayout.getWidth(20)),
              child: Column(
                children: [
                  Gap(AppLayout.getHeight(20)),
                  Row( // text
                    children: [
                      Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            "review", style: Styles.headLineStyle1,
                          ),
                        ],
                      )
                    ],
                  ),
                  Gap(AppLayout.getHeight(25)),
                  Container(  //search bar
                    decoration: BoxDecoration(
                        borderRadius: BorderRadius.circular(AppLayout.getHeight(10)),
                        color: const Color(0xFFF4F6FD)
                    ),
                    padding: EdgeInsets.symmetric(horizontal: AppLayout.getWidth(12), vertical: AppLayout.getHeight(12)),
                    child: Row(
                      children: [
                        const Icon(FluentSystemIcons.ic_fluent_search_regular, color: Color(0xFFBFC205)),
                        Text(
                          "place, restaurant",
                          style: Styles.headLineStyle4,
                        )
                      ],
                    ),
                  ),
                ],
              ),
            ),
          ),
        ),

'
出现错误的代码：
'

SliverList(
    delegate: SliverChildListDelegate(
        (BuildContext context, int index) {
          return _buildListItem(foodList2[index]);
        },
    ),
),

'
foodList2列表：
'

static const List<Tuple4> foodList2 = [
  Tuple4<String, String, String, String> (
    'assets/images/eel.jpg',
    'assets/images/aburasoba.jpg',
    'assets/images/soba.jpg',
    'assets/images/okonomiyaki.jpg',
  )
];

'
我试着查找关于SliverList的信息和更多关于SliverChildListDelegate的信息，我发现当我删除主体时，这个错误会消失。我确实想保留这个主体，所以有什么方法可以解决这个问题吗？（我知道我的代码中现在没有_buildListItem）