如何在擴展磁貼中顯示ListView.builder專案

我試圖顯示ListView.builder在```擴展磁貼中使用的專案串列，但它沒有顯示任何內容，也沒有給出任何錯誤。

這是擴展瓷磚的代碼

customExpansionTile(context, "Additional discount", true,
                Icon(Icons.add_task, color: HexColor("#5344ed")), <Widget>[
              Column(
              mainAxisSize: MainAxisSize.min,
                children: [
                  Container(
                    width: MediaQuery.of(context).size.width * 0.9,
                    child: Row(
                      children: [
                        SizedBox(
                          width: MediaQuery.of(context).size.width * 0.022,
                        ),
                        textformfieldCustomwithouticon(
                            context,
                            TextInputType.number,
                            MediaQuery.of(context).size.width * 0.4,
                            quantity,
                            "Enter the quantity",
                            "Quantity ",
                            55.0),
                        SizedBox(
                          width: MediaQuery.of(context).size.width * 0.03,
                        ),
                        textformfieldCustomwithouticon(
                            context,
                            TextInputType.number,
                            MediaQuery.of(context).size.width * 0.42,
                            discountPercentage,
                            "Enter the discount",
                            "Discount",
                            55.0),
                      ],
                    ),
                  ),
               
              SizedBox20(),
              customButton(context, "Add", () {},
                  MediaQuery.of(context).size.width * 0.85, 55.0),
              SizedBox20(),

// here i'm using Listview.builder
              Flexible(                   
                  fit: FlexFit.loose,
                child: Container(
                  width:MediaQuery.of(context).size.width * 0.9,
                  height:MediaQuery.of(context).size.height*0.5,
                 child: ListView.builder(
                  itemCount: books.length,
                  itemBuilder: (context, index) {
                    final book = books[index];
                
                    return buildDiscount(book);
                  },
                ),
                )),
                    
               ],
              ),
              SizedBox10()
            ]),

構建折扣代碼：

 Widget buildDiscount(Book book) => Card(
      elevation: 0.0,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.all(
          Radius.circular(10),
        ),
      ),
      child: ListTile(
        trailing: SizedBox(
          height: 100,
          child: Column(
            children: [
              InkWell(
                onTap: () {
                  _getVariantRowInfo(book.id, book.id, book.id);
                },
                child: Icon(Icons.edit, color: HexColor("#7367f0")),
              ),
              SizedBox(
                height: 5,
              ),
              InkWell(
                onTap: () {},
                child: Icon(Icons.delete, color: HexColor("#7367f0")),
              ),
            ],
          ),
        ),
        title: Padding(
          padding: const EdgeInsets.fromLTRB(0, 10, 15, 0),
          child: Text(
            "  Quantity:  90",
            style: GoogleFonts.montserrat(
                fontSize: 15, fontWeight: FontWeight.bold,color: Colors.red),
          ),
        ),
        horizontalTitleGap: 10,
        subtitle: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              "  Discount %:  "   "10%",
              style: GoogleFonts.montserrat(fontSize: 15),
            ),
            Text(
              "  Discounted Price:  "   "90",
              style: GoogleFonts.montserrat(fontSize: 15),
            ),
            SizedBox(
              height: 10,
            )
          ],
        ),
      ));

輸出

請幫忙，我做錯的地方。

自定義擴展平鋪

Widget customExpansionTile(context, text,initiallyExpanded,leading,childern) {
  return GestureDetector(
   
    child: Container(
      width:MediaQuery.of(context).size.width*0.9,
    // height: 400,
    decoration: BoxDecoration(
      border: Border.all(color: HexColor("#6e6b7b")),
      color: Colors.white,
      borderRadius: BorderRadius.all(
        Radius.circular(10),
      ),
    ),
      child: ExpansionTile(
      title: Text(
          text,
          style: GoogleFonts.montserrat(
              fontSize: 18.0,
              fontWeight: FontWeight.bold,
              color: HexColor("#5344ed")),
        ),
        initiallyExpanded:initiallyExpanded,
        leading:leading,
        children: childern,
     ),
    ),
  );
}

uj5u.com熱心網友回復：

如果你使用的容器寬度和高度u需要不靈活小部件一樣Expanded，并Flexible在父母，洗掉Flexible，還可以添加拆封：真實的ListView.builder

Flexible(   /// <---  remove this parent or remove Container if you get flexible ListView.builder               
                  fit: FlexFit.loose,
                child: Container(
                  width:MediaQuery.of(context).size.width * 0.9,
                  height:MediaQuery.of(context).size.height*0.5,
                 child: ListView.builder(
                  itemCount: books.length,
                  itemBuilder: (context, index) {
                    final book = books[index];
                
                    return buildDiscount(book);
                  },
                ),
                )),

或者

嘗試使用Expanded類似的東西

   Expanded: 
      child customExpansionTile(context, "Additional discount", true,
              Icon(Icons.add_task, color: HexColor("#5344ed")), [
              Expanded: child: 
                Column(
                  mainAxisSize: MainAxisSize.min,
                  .....

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