Array to Listview flutter

Question

我有这个Json列表，应该在listview中，我试图调用Api，它返回数组对象的每个值，但是当我在命令行中打印出结果时，它仅显示json中的1个值，

为什么我尝试解码数组值中仅显示一个值的数据

这就是杰森

{
  "Status": 1,
  "Membership_Plans": [
    {
      "Is_Membership_Activated": true,
      "Status": 1,
      "_id": "5cc2c6d92e444a62fcfadcb1",
      "Membership_Amount": "7000",
      "Membership_Duration_In_Months": 6,
      "Registration_Date": "1556236800",
      "__v": 0
    },
    {
      "Is_Membership_Activated": true,
      "Status": 1,
      "_id": "5cc2c6e32e444a62fcfadcb2",
      "Membership_Amount": "12000",
      "Membership_Duration_In_Months": 12,
      "Registration_Date": "1556236800",
      "__v": 0
    },
    {
      "Is_Membership_Activated": true,
      "Status": 1,
      "_id": "5dca5d5cfc150c7e2bbb84d2",
      "Membership_Amount": "4000",
      "Membership_Duration_In_Months": 3,
      "Registration_Date": "1573543251",
      "__v": 0
    }
  ]
}

用于检索Api的功能

Future<String> GetDetails() async {
  Future notificatinstatus = SharedPrefrence().getuserId();

  notificatinstatus.then((data) async {
    var userid = data;
    print(userid);
    var response = await http.post(Urls.Gym_Validate,
        headers: {"Content-Type": "application/json"},
        body: json.encode({"Id_To_Validate": userid}));
    print('Respone: ${response.body}');

    try {
      Map<String, dynamic> value = json.decode(response.body);
      var status = value['Status'].toString();
      var details = value['Membership_Plans'][0];

      var Duration = details["Membership_Duration_In_Months"];
      var Amount = details["Membership_Amount"];

      print(Duration);
      print(Amount);

    } catch (e) {
      e.toString();
    }
  });
}

Answer 1

尝试一下。将索引放在第一位。

Future<String> GetDetails() async {
  Future notificatinstatus = SharedPrefrence().getuserId();

  notificatinstatus.then((data) async {
    var userid = data;
    print(userid);
    var response = await http.post(Urls.Gym_Validate,
        headers: {"Content-Type": "application/json"},
        body: json.encode({"Id_To_Validate": userid}));
    print('Respone: ${response.body}');

    try {
      Map<String, dynamic> value = json.decode(response.body);
      var status = value['Status'].toString();
      var details = value[0]['Membership_Plans'];

      var Duration = details[0]["Membership_Duration_In_Months"];
      var Amount = details[0]["Membership_Amount"];

      print(Duration);
      print(Amount);

    } catch (e) {
      e.toString();
    }
  });
}