I cannot display my response in text widgets in flutter - flutter

Question

I have used post method for user login which is successfully done and it returns responses in list which I need to display in text widget in some other class, but when I try to display it in text widget using Future builder it throws exception in my emulator but nothing shows in my console.
This is my APIService class, it works fine when I post details but when i try to display the response in text widget, it shows exception from this class, at the bottom of this code there is " throw Exception('Failed');" it shows this exception only when I try to display the response in text widgets.
class APIService {
Future<DoctorResponseLoginModels> register(
DoctorRequestLoginModels doctorLoginRequestModels) async {
String url = "http://202.51.75.142:9028/api/PatientMaster/PostPatientLogin";
SharedPreferences sharedPreferences = await SharedPreferences.getInstance();
var globalToken = sharedPreferences.getString("token");
print("$globalToken");
http.Response response = await http.post(Uri.parse(url),
headers: {
"Content-Type": "application/json",
'Accept': 'application/json',
'Authorization': 'Bearer $globalToken',
},
body: jsonEncode(doctorLoginRequestModels));
var responseJson = json.decode(response.body.toString());
DoctorResponseLoginModels responseModel =
DoctorResponseLoginModels.fromJson(responseJson);
print("This is ${response.body}");
if (response.statusCode == 200) {
sharedPreferences.setInt('code', response.statusCode);
var StatusCode = sharedPreferences.getInt('code');
print("This contains : $StatusCode");
return DoctorResponseLoginModels.fromJson(jsonDecode(response.body));
} else {
throw Exception('Failed');
}
}
}
This is My DoctorRequestLoginModels class which I send to server.
DoctorRequestLoginModels doctorRequestLoginModelsFromJson(String str) =>
DoctorRequestLoginModels.fromJson(json.decode(str));
String doctorRequestLoginModelsToJson(DoctorRequestLoginModels data) =>
json.encode(data.toJson());
class DoctorRequestLoginModels {
DoctorRequestLoginModels({
required this.code,
required this.username,
required this.password,
});
String code;
String username;
String password;
factory DoctorRequestLoginModels.fromJson(Map<String, dynamic> json) =>
DoctorRequestLoginModels(
code: json["code"],
username: json["username"],
password: json["password"],
);
Map<String, dynamic> toJson() => {
"code": code,
"username": username,
"password": password,
};
}
This is my DoctorRespinseModels class which I need to display in text widgets.
DoctorResponseLoginModels doctorResponseLoginModelsFromJson(String str) =>
DoctorResponseLoginModels.fromJson(json.decode(str));
String doctorResponseLoginModelsToJson(DoctorResponseLoginModels data) =>
json.encode(data.toJson());
class DoctorResponseLoginModels {
DoctorResponseLoginModels({
this.doctorId,
this.nmCno,
this.doctorName,
this.contactNo,
this.username,
this.emailId,
this.strEmail,
this.id,
this.intMobile,
this.gender,
this.currentAddress,
this.depId,
this.entryDate,
this.password,
this.code,
this.isActive,
this.hospitalName,
this.department,
this.deviceId,
this.profile,
this.token,
this.role,
});
int? doctorId;
String? nmCno;
String? doctorName;
String? contactNo;
dynamic? username;
String? emailId;
String? strEmail;
int? id;
String? intMobile;
dynamic? gender;
String? currentAddress;
int? depId;
String? entryDate;
dynamic? password;
dynamic? code;
bool? isActive;
dynamic? hospitalName;
dynamic? department;
dynamic? deviceId;
String? profile;
String? token;
String? role;
factory DoctorResponseLoginModels.fromJson(Map<String, dynamic> json) =>
DoctorResponseLoginModels(
doctorId: json["doctorID"],
nmCno: json["nmCno"],
doctorName: json["doctorName"],
contactNo: json["contactNo"],
username: json["username"],
emailId: json["emailID"],
strEmail: json["strEmail"],
id: json["id"],
intMobile: json["intMobile"],
gender: json["gender"],
currentAddress: json["currentAddress"],
depId: json["depId"],
entryDate: json["entryDate"],
password: json["password"],
code: json["code"],
isActive: json["isActive"],
hospitalName: json["hospitalName"],
department: json["department"],
deviceId: json["deviceId"],
profile: json["profile"],
token: json["token"],
role: json["role"],
);
Map<String, dynamic> toJson() => {
"doctorID": doctorId,
"nmCno": nmCno,
"doctorName": doctorName,
"contactNo": contactNo,
"username": username,
"emailID": emailId,
"strEmail": strEmail,
"id": id,
"intMobile": intMobile,
"gender": gender,
"currentAddress": currentAddress,
"depId": depId,
"entryDate": entryDate,
"password": password,
"code": code,
"isActive": isActive,
"hospitalName": hospitalName,
"department": department,
"deviceId": deviceId,
"profile": profile,
"token": token,
"role": role,
};
}
And this is where I need it to be displayed, where I have used FutureBuilder and I this I made a mistake here but not sure where exactly.
#override
Widget build(BuildContext context) {
Size size = MediaQuery.of(context).size;
return Scaffold(
backgroundColor: const Color.fromRGBO(249, 249, 249, 10),
body: Column(
children: [
Expanded(
child: Container(
height: 150.0,
width: 150.0,
color: Colors.grey.shade100,
child: FutureBuilder<DoctorResponseLoginModels>(
future: APIService().register(DoctorRequestLoginModels(
code: "code", username: "username", password: "password")),
builder: (context, snapshot) {
switch (snapshot.connectionState) {
case ConnectionState.waiting:
return Text('Loading....');
default:
if (snapshot.hasError) {
return Text('Error: ${snapshot.error}');
} else {
DoctorResponseLoginModels data = snapshot.data!;
return Column(
children: [
Text(data.doctorName!),
],
);
}
}
},
),
)),
],
));
}