response.body returns null using retrofit:2.3.0 - retrofit2

Question

my json data is this
{
"data":[
{
"id":"4",
"totalOpns":"40000",
"killedDrugPer":"320",
"arrestedDrugPer":"17683",
"houseVisited":"4000",
"userSurrenderers":"45000",
"pusherSurrenderers":"15000",
"totalSurrenderers":"60000",
"killedPNPPerOpns":"40",
"woundedPNPPerOpns":"70",
"killedAFPPerOpns":"100",
"woundedAFPPerOpns":"10",
"date":"2017-07-12 13:57:34.000"
}
]
}
and my data model is this
package com.androidtutorialpoint.retrofitandroid;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
import java.io.Serializable;
public class Student implements Serializable {
//Variables that are in our json
#SerializedName("id")
#Expose
private String id;
#SerializedName("totalOpns")
#Expose
private String totalOpns;
#SerializedName("killedDrugPer")
#Expose
private String killedDrugPer;
#SerializedName("arrestedDrugPer")
#Expose
private String arrestedDrugPer;
#SerializedName("houseVisited")
#Expose
private String houseVisited;
#SerializedName("userSurrenderers")
#Expose
private String userSurrenderers;
#SerializedName("pusherSurrenderers")
#Expose
private String pusherSurrenderers;
#SerializedName("totalSurrenderers")
#Expose
private String totalSurrenderers;
#SerializedName("killedPNPPerOpns")
#Expose
private String killedPNPPerOpns;
#SerializedName("woundedPNPPerOpns")
#Expose
private String woundedPNPPerOpns;
#SerializedName("killedAFPPerOpns")
#Expose
private String killedAFPPerOpns;
#SerializedName("woundedAFPPerOpns")
#Expose
private String woundedAFPPerOpns;
#SerializedName("date")
#Expose
private String date;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTotalOpns() {
return totalOpns;
}
public void setTotalOpns(String totalOpns) {
this.totalOpns = totalOpns;
}
public String getKilledDrugPer() {
return killedDrugPer;
}
public void setKilledDrugPer(String killedDrugPer) {
this.killedDrugPer = killedDrugPer;
}
public String getArrestedDrugPer() {
return arrestedDrugPer;
}
public void setArrestedDrugPer(String arrestedDrugPer) {
this.arrestedDrugPer = arrestedDrugPer;
}
public String getHouseVisited() {
return houseVisited;
}
public void setHouseVisited(String houseVisited) {
this.houseVisited = houseVisited;
}
public String getUserSurrenderers() {
return userSurrenderers;
}
public void setUserSurrenderers(String userSurrenderers) {
this.userSurrenderers = userSurrenderers;
}
public String getPusherSurrenderers() {
return pusherSurrenderers;
}
public void setPusherSurrenderers(String pusherSurrenderers) {
this.pusherSurrenderers = pusherSurrenderers;
}
public String getTotalSurrenderers() {
return totalSurrenderers;
}
public void setTotalSurrenderers(String totalSurrenderers) {
this.totalSurrenderers = totalSurrenderers;
}
public String getKilledPNPPerOpns() {
return killedPNPPerOpns;
}
public void setKilledPNPPerOpns(String killedPNPPerOpns) {
this.killedPNPPerOpns = killedPNPPerOpns;
}
public String getWoundedPNPPerOpns() {
return woundedPNPPerOpns;
}
public void setWoundedPNPPerOpns(String woundedPNPPerOpns) {
this.woundedPNPPerOpns = woundedPNPPerOpns;
}
public String getKilledAFPPerOpns() {
return killedAFPPerOpns;
}
public void setKilledAFPPerOpns(String killedAFPPerOpns) {
this.killedAFPPerOpns = killedAFPPerOpns;
}
public String getWoundedAFPPerOpns() {
return woundedAFPPerOpns;
}
public void setWoundedAFPPerOpns(String woundedAFPPerOpns) {
this.woundedAFPPerOpns = woundedAFPPerOpns;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
}
and the interface is this
package com.androidtutorialpoint.retrofitandroid;
import retrofit2.Call;
import retrofit2.http.GET;
public interface RetrofitObjectAPI {
/*
* Retrofit get annotation with our URL
* And our method that will return us details of student.
*/
// #GET("JSONTESTING/index.php")
#GET("getJson")
Call<Student> getStudentDetails();
}
and in my main is this
private void getRetrofitObject() {
HttpLoggingInterceptor.Level logLevel = HttpLoggingInterceptor.Level.BODY;
HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
// set your desired log level
logging.setLevel(logLevel);
OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
// add your other interceptors …
// add logging as last interceptor
httpClient.addInterceptor(logging); // <-- this is the important line!
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(url)
.addConverterFactory(GsonConverterFactory.create())
.client(httpClient.build())
.build();
RetrofitObjectAPI service = retrofit.create(RetrofitObjectAPI.class);
Call<Student> call = service.getStudentDetails();
call.enqueue(new Callback<Student>() {
#Override
public void onResponse(Call<Student> call, Response<Student> response) {
try {
if (response.isSuccessful()) {
text_id_1.setText("StudentId : " + response.body().getId());
text_name_1.setText("StudentName : " + response.body().getTotalOpns());
text_marks_1.setText("StudentMarks : " + response.body().getArrestedDrugPer());
} else {
//unsuccessful response
}
} catch (Exception e) {
Log.d("onResponse", "There is an error");
e.printStackTrace();
}
}
#Override
public void onFailure(Call<Student> call, Throwable t) {
Log.d("onFailure", t.toString());
}
});
}
and in my logcat is this, i can see the json data but on my response.body returns null.
logcat
What should I do?

Answer 1

You are getting a response but there is issue in deserialization.
Reason being the Call<Student> is not the type it will be serialized to becuase you are getting a List of Students(JSONArray).
add this class
MyResponse
public class MyResponse {
#SerializedName("data")
#Expose
private List<Student> data = null;
public List<Student> getData() {
return data;
}
public void setData(List<Student> data) {
this.data = data;
}
}
and change your call to:
#GET("getJson")
Call<MyResponse> getStudentDetails();
Now you will get response body
and how to retrive?
List<Student> students = response.body().getData();
This will do..:)