Retrofit JSON GET request returning null

Question

Retrofit JSON GET request is returning null for a nested field. How can I access the UserID field data ? What am i doing wrong ? I don't know how to parse json using retrofit. Am familiar with parsing simple json using Retrofit but am not familiar with parsing nested Json using Retrofit.

JSON Data:

{
    "Status": "Success",
    "ErrorMessage": null,
    "ErrorKey": null,
    "RedirectUrl": null,
    "Data": {
        "UserDetails": {
            "UserID": "d7a6397c-fa33-4268-a64a-b99d0e78dfcf"
        }
    }
}

GetData Interface:

@GET("Account/LoginAPi")
    Call<LoginResponse> getUser(@Query("UserName") String username,
                                    @Query("Password") String password);

POJO:

public class LoginResponse {

    @SerializedName("UserName")
    String UserName;

    @SerializedName("Password")
    String Password;

    @SerializedName("UserID")
    String UserID;

    @SerializedName("Status")
    String Status;



    public LoginResponse(String UserName, String Password, String UserID, String Status)
    {
        this.UserName = UserName;
        this.Password = Password;
        this.UserID = UserID;
        this.Status = Status;
    }

    public String getPassword() {
        return Password;
    }

    public void setPassword(String Password){
        this.Password = Password;
    }

    public String getUserName() {
        return UserName;
    }

    public void setUserName(String UserName){
        this.UserName = UserName;
    }

    public String getUserID() {
        return UserID;
    }

    public void setUserID(String UserID) {
        this.UserID = UserID;
    }

    public String getStatus() {
        return Status;
    }

    public void setStatus(String Status) {
        this.Status = Status;
    }
}

MainActivity:

GetData service = RetrofitClient.getRetrofitInstance().create(GetData.class);

            Call<LoginResponse> call =  service.getUser(username, password);

            call.enqueue(new Callback<LoginResponse>() {
                @Override
                public void onResponse(Call<LoginResponse> call, Response<LoginResponse> response) {
                    pDialog.dismiss();

                    try {
                        String userid = response.body().getUserID();
                        toast(userid);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }

                }

                @Override
                public void onFailure(Call<LoginResponse> call, Throwable t) {

                }
            });

Answer 1

Your login response class does not match the json that you gave, that's your problem.

I usually parse json files easily by using jsonschema2pojo website

Paste your json in there:

-------------- Data --------------------
public class Data {

 @SerializedName("UserDetails")
 public UserDetails userDetails;

}
-------------- LoginResponse ------------

package com.example;

import com.google.gson.annotations.SerializedName;

public class LoginResponse {

@SerializedName("Status")
public String status;
@SerializedName("ErrorMessage")
public Object errorMessage;
@SerializedName("ErrorKey")
public Object errorKey;
@SerializedName("RedirectUrl")
public Object redirectUrl;
@SerializedName("Data")
public Data data;

}
-----------------------------------com.example.UserDetails.java-----------------------------------

package com.example;

import com.google.gson.annotations.SerializedName;

public class UserDetails {

@SerializedName("UserID")
public String userID;

}