//API Service

public interface ApiService {

@POST("apiName.php")

Call<ResponseBody> uploadImage(@Body RequestBody file,

@Query("user_id") String user_id,

@Query("number") String number);

}

//Base URL

public class ApiUtilities {

//Live

// public static final String baseurl = "BASE URL";

public static ApiService getApiservice() {

return RetrofitClient.getClient(baseurl).create(ApiService.class);

}

}

//Intercepter

public class RetrofitClient {

public static Retrofit retrofit = null;

public static Retrofit getClient(String baseurl) {

if (retrofit == null) {

retrofit = new Retrofit.Builder().baseUrl(baseurl)

.addConverterFactory(GsonConverterFactory.create())

.build();

}

return retrofit;

}

}