小部件库 RangeError (index) 捕获的异常：无效值：不在包含范围 0..35: 36

Question

Widget build(BuildContext context) {
    return Scaffold(
    appBar: AppBar(
        title: Text(
          'Products',
         ),
       ),
    body: Center(
       child: FutureBuilder(
          future: fetchPhotos(),
               builder: (ctx, snapShot) {
                    if (snapShot.connectionState == ConnectionState.waiting) {
                         return CircularProgressIndicator();
                     } else {
                    return ListView.builder(
                      itemBuilder: (context, index) {
                         return ListTile(
                          leading: CircleAvatar(
                             backgroundColor: Colors.red,
                          ),
                           title: Text(snapShot.data["table"][index]["name"]),
                           subtitle: Text(
                              "price: ${snapShot.data["table"][index]["class_id"]}"),
                       );
                     },
                   );
                 }
               },
              ),
            ),
          );
         }

我应该在 itemCount 中放入什么才不会显示错误：小部件库 RangeError (index) 捕获异常：无效值：不在包含范围 0..35: 36

Answer 1

将 itemCount 参数添加到您的 listView Builder 中：

ListView.builder(
 itemCount: snapShot.data["table"].length,
 itemBuilder: (context, index) {
       ...

这样 flutter 就知道什么时候停止构建项目

小部件库 RangeError (index) 捕获的异常：无效值：不在包含范围 0..35: 36

Exception caught by widgets library RangeError (index): Invalid value: Not in inclusive range 0..35: 36

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