Question

我得到一个错误

Exception caught by gesture
Class 'String' has no instance getter 'status'
Receiver: 'Under PUI'
Tried calling: status

当我选择单选按钮时。我从firebase获得此单选按钮。请在下面查看我的代码：

class HealthStatusList extends StatefulWidget {
  @override
  _HealthStatusState createState() => _HealthStatusState();
}

class _HealthStatusState extends State<HealthStatusList> {
  List<HealthStatus> healthStatusList = new List<HealthStatus>();

  HealthStatus selectedHealthStatus;

  @override
  Widget build(BuildContext context) {
    final healthStatuses = Provider.of<QuerySnapshot>(context);
    // print(healthStatuses.documents);

    for (var doc in healthStatuses.documents) {
      int pos = doc.data['position'];
      String sts = doc.data['status'];
      String stc = doc.data['statusCode'];
      HealthStatus hs =
          new HealthStatus(position: pos, status: sts, statusCode: stc);
      healthStatusList.add(hs);
      print(doc.data['position']);
    }

    setSelectedHealthStatus(HealthStatus hs) {
      setState(() {
        selectedHealthStatus = hs;
      });
    }

    List<Widget> createRadioListeners() {
      List<Widget> widgets = [];
      for (HealthStatus hs in healthStatusList) {
        widgets.add(RadioListTile(
          value: hs.status,
          groupValue: selectedHealthStatus,
          title: Text(hs.status),
          onChanged: (currentStatus) {
            print("Current Status ${currentStatus.status}");
            setSelectedHealthStatus(currentStatus);
          },
          selected: selectedHealthStatus == hs,
          activeColor: Colors.green,
        ));
      }
      return widgets;
    }

    return Scaffold(
      body: Column(
        mainAxisAlignment: MainAxisAlignment.start,
        children: <Widget>[
          Container(
            padding: EdgeInsets.all(20.0),
            child: Text('How are you feeling?'),
          ),
          Column(
            children: createRadioListeners(),
          )
        ],
      ),
    );
  }
}

这是HealthStatus类

class HealthStatus {
  final int position;
  final String status;
  final String statusCode;

  HealthStatus({this.position, this.status, this.statusCode});

  @override
  String toString() {
    // TODO: implement toString
    return status;
  }
}

当我选择单选按钮时，我应该得到字符串“状态”字符串。

此外，当我单击单选按钮时，我看不到所选单选按钮上的点。您能指出我做错了什么吗？谢谢。

Answer 1

此：

selected: selectedHealthStatus == hs,

应该是

selected: selectedHealthStatus == hs.status,

Class String没有实例获取器

1 个答案: