URL:- http://www.mocky.io/v2/ 5b936d6f33000011002061d3 1 ) Create RetrofitClient(Base URL Class) import retrofit2.GsonConverterFactory; import retrofit2.Retrofit; public class RetrofitClient { //http://www.mocky.io/v2/5b936d6f33000011002061d3 public static final String API_BASE_URL = "http://www.mocky.io/v2/" ; public static Retrofit retrofit = null ; public static Retrofit getApiClient() { if ( retrofit == null ) { retrofit = new Retrofit.Builder().baseUrl( API_BASE_URL ).addConverterFactory(GsonConverterFactory . create ()).build(); } return retrofit ; } } 2 ) Create Retrofit ApiInterface Class(End URL Class) import com.example.discusit.complexretrofitdemo.model.Data; import retrofit2.Call; import retrofit2.http. GET ; public interface ApiInterface { @GET ( "5b936d6f33000011002061d3" ) Call<Data> getData(); } 3 ) Create Require Model Clas...