Retrofit 2 demo example

First of all, add gradle dependency

dependencies {

compile 'com.squareup.retrofit2:retrofit:2.1.0'    

compile 'com.squareup.retrofit2:converter-gson:2.0.0'    

compile 'com.squareup.okhttp3:logging-interceptor:3.2.0'}

Check for updated version.

Make one class that handle retrofit stuff

NetCall.java

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonObject;

import okhttp3.OkHttpClient;
import okhttp3.ResponseBody;
import okhttp3.logging.HttpLoggingInterceptor;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
import retrofit2.http.Body;
import retrofit2.http.POST;

/** * Created by axay on 09-05-2016. */

public class NetCall {
    String baseUrl = "http://example.com/service/";
    public Request request;

    public Call<JsonObject> featuredPlaylist(JsonObject jsonObject) {
        return request.featuredPlaylist(jsonObject);
    }

    public Call<JsonObject> allUserPlaylist(JsonObject jsonObject) {
        return request.allUserPlaylist(jsonObject);
    }

    public interface Request{
        @POST("library/featuredplaylist.php")
        Call<JsonObject> featuredPlaylist(@Body JsonObject jsonObject);

        @POST("library/alluserplaylist.php")
        Call<JsonObject> allUserPlaylist(@Body JsonObject jsonObject);

    }


    public NetCall(){
        Gson gson = new GsonBuilder().disableHtmlEscaping().create();

        HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
        interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        OkHttpClient client = new OkHttpClient.Builder().addInterceptor(interceptor).build();

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(baseUrl)
                .client(client)
                .addConverterFactory(GsonConverterFactory.create(gson))
                .build();

        request = retrofit.create(Request.class);
    }
}

Now call this wherever you want.

Suppose In MainActivity.java


import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;

import com.google.gson.JsonObject;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        JsonObject jsonObject = new JsonObject();

        new NetCall().featuredPlaylist(jsonObject).enqueue(new Callback<JsonObject>() {
            @Override
            public void onResponse(Call<JsonObject> call, Response<JsonObject> response) {
                JsonObject jsonObject1 = response.body();
            }

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

            }
        });

        new NetCall().allUserPlaylist(jsonObject).enqueue(new Callback<JsonObject>() {
            @Override
            public void onResponse(Call<JsonObject> call, Response<JsonObject> response) {
                JsonObject jsonObject1 = response.body();
            }

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

            }
        });
    }
}

Now Parse JsonObject as per your requirements got in onResponse(...).