问当我得到图像数据然后放入图像toList时，该怎么办？

EN

class Summary {
  String summaryIcon;
  String summaryName;
  Summary(this.summaryIcon, this.summaryName);
}

 ValueNotifier<List<Summary>> listValueNotifier = ValueNotifier([]);



 @override
Widget build(BuildContext context) {
return ValueListenableBuilder<List<Summary>>(
    valueListenable: listValueNotifier,
    builder: (context, data, child) {
      return Container(
          child: Row(
        children: [...data.map((e) => Image.asset(e.summaryName)).toList()],
      ));
    });

getFeature() async {
 final docSnapshot = await FirebaseFirestore.instance
    .collection('Campsite')
    .doc(widget.CamperSiteID)
    .get();
final CamperSiteSummary =
    List<int>.from(docSnapshot.data()?['CamperSiteSummary'] ?? []);
List<Summary> list = [];

CamperSiteSummary.forEach((element) {
  var SummaryIcon;
  var SummaryName;
  switch (element) {
    case 1:
      SummaryIcon = 'assest/kitchen.png';
      SummaryName = 'Kitchen';
      break;
    case 2:
      SummaryIcon = 'assest/barbecue.png';
      SummaryName = 'Barbecue';
      break;
    case 3:
      SummaryIcon = 'assest/suit_any_car.png';
      SummaryName = 'Suit any car';
      break;
    case 4:
      SummaryIcon = 'assest/laundromat.png';
      SummaryName = 'Laundromat';
      break;
    case 5:
      SummaryIcon = 'assest/dump_station.png';
      SummaryName = 'Dump station';
      break;
  }
  print(element);
  if (SummaryIcon != null && SummaryName != null) {
    list.add(Summary(SummaryIcon, SummaryName));
  }
});
listValueNotifier.value = list;