Json 已解析但无法在 UI flutter 中显示数据

Question

我试图从 REST API 中获取数据结果，然后将其显示在 UI 中。所以一切顺利 JSON 被解析得很好 try and catch 方法工作正常。但不知何故，代码无法在 UI 中显示解析结果。都没有给我错误或异常。在过去的几天里，我一直在努力获得想要的结果。

型号Class:

import 'dart:convert';

Transaction transactionFromJson(String str) =>
    Transaction.fromJson(json.decode(str));

String transactionToJson(Transaction data) => json.encode(data.toJson());

class Transaction {
  Transaction({
    required this.dataDescription,
    required this.orderStatus,
    required this.statusObjects,
  });

  String dataDescription;
  String orderStatus;
  List<StatusObject> statusObjects;

  factory Transaction.fromJson(Map<String, dynamic> json) => Transaction(
        dataDescription: json["data-description"],
        orderStatus: json["order-status"],
        statusObjects: List<StatusObject>.from(
            json["status-objects"].map((x) => StatusObject.fromJson(x))),
      );

  Map<String, dynamic> toJson() => {
        "data-description": dataDescription,
        "order-status": orderStatus,
        "status-objects":
            List<dynamic>.from(statusObjects.map((x) => x.toJson())),
      };
}

class StatusObject {
  StatusObject({
    required this.type,
    required this.status,
    required this.date,
    required this.time,
  });

  String type;
  String status;
  DateTime date;
  String time;

  factory StatusObject.fromJson(Map<String, dynamic> json) => StatusObject(
        type: json["type"],
        status: json["status"],
        date: DateTime.parse(json["date"]),
        time: json["time"],
      );

  Map<String, dynamic> toJson() => {
        "type": type,
        "status": status,
        "date": date.toIso8601String(),
        "time": time,
      };
}

This is how the JSON looks like:

    {
        "data-description": "This api will return an array of objects to be placed in the order status timeline on the second screen",
        "order-status": "Success",
        "status-objects": [
            {
                "type": "Payment",
                "status": "completed",
                "date": "2021-07-02T00:00:00",
                "time": "12:00AM"
            },
            {
                "type": "Units Allocated",
                "status": "by Axis",
                "date": "2021-07-13T00:00:00",
                "time": "12:00AM"
            }
        ]
    }

API_Manager 解析和获取发生的地方服务 Class

class API_Manager {
  static Future<Transaction> getDetails() async {
    var client = http.Client();
    var transactions;
    try {
      var response = await client.get(
          Uri.https("your api url here"));

      if (response.statusCode == 200) {
        var jsonString = response.body;
        var jsonMap = jsonDecode(jsonString);
        transactions = Transaction.fromJson(jsonMap);
      }
    } catch (e) {
      return transactions;
    }
    return transactions;
  }
}

UI 组件，我想在其中显示已解析的 JSON:

代码

FutureBuilder<Transaction>(
                  future: API_Manager.getDetails(),
                  builder: (context, snapshot) {
                    if (snapshot.hasData) {
                      var data = snapshot.data!.statusObjects;
                      return ListView.builder(
                        itemCount: data.length,
                        itemBuilder: (context, index) =>
                            Text('$index : ${data[index].status}'),
                      );
                    }
                    return Text('Something was wrong!');
                  },
                ),

我得到的输出是“出了点问题”

我很确定我遗漏了一小段代码来让它工作。我已经在这段代码上工作了好几天，但我做不到。我请求你们，请帮助我获得结果或指出我遗漏的代码。

如果你能以任何可能的方式帮助我，我将不胜感激。

Answer 1

试试这个

var response = await client
          .get(Uri.https("domain", "accounts/test-data/"));

或

var response = await http
      .get(Uri.parse("domain/accounts/test-data/"));

这个不起作用可能是因为主域部分不应该使用 /，因为它表示子路径，

      var response = await client
          .get(Uri.https("domain/accounts", "test-data/"));

Json 已解析但无法在 UI flutter 中显示数据

Json got parsed but the cannot display the data in the UI flutter

json

dart

flutter

flutter-widget