retrofit 1.9 basics 2

dependencies {

 implementation 'com.squareup.retrofit:retrofit:1.9.0'

    //butter knife

    implementation 'com.jakewharton:butterknife:8.8.1'

    annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'

}

<uses-permission android:name="android.permission.INTERNET"/>

<RelativeLayout android:layout_width="match_parent"

    android:layout_height="match_parent"

    xmlns:android="http://schemas.android.com/apk/res/android">

    <TextView

        android:id="@+id/tv_result"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:textSize="22sp"/>

</RelativeLayout>

public interface AppConstants {

    String BASE_URL = "https://api.github.com/";

}

import com.google.gson.JsonObject;

public interface ApiRequests {

    @GET("/users/{userName}")

    void getUserDetails(@Path("userName") String name, Callback<JsonObject> callback);

}

public class ApiConnector {

    public static ApiRequests getApiConnector(String baseUrl) {

        RestAdapter restAdapter = new RestAdapter.Builder().setEndpoint(baseUrl).build();

        return restAdapter.create(ApiRequests.class);

    }

}

public class MainActivity extends AppCompatActivity {

    @BindView(R.id.tv_result)

    TextView mTVResult;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        ButterKnife.bind(this);

        ApiRequests apiRequests   = ApiConnector.getApiConnector(AppConstants.BASE_URL); //todo;

        apiRequests.getUserDetails("lokeshkondaparthi", new Callback<JsonObject>() {

            @Override

            public void success(JsonObject jsonObject, Response response) {

                String location = jsonObject.get("location").getAsString();

                mTVResult.setText(location);

            }

            @Override

            public void failure(RetrofitError error) {

                mTVResult.setText(error.getMessage());

            }

        });

    }

}