PokemonAPI.java

package com.lctics.retrofit2.dataPokemon.remote;

import com.lctics.retrofit2.dataPokemon.model.PokemonFeed;
import retrofit2.Call;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
import retrofit2.http.GET;

public interface PokemonAPI {
    String BASE_URL = "http://pokeapi.co/api/v1/";
    @GET("pokemon/" + pokemonID + "/")
    Call<PokemonFeed> getPokemon();

    class Factory{
        private static PokemonAPI service;
        public static PokemonAPI getInstance(){
            if(service == null){
                Retrofit retrofit = new Retrofit.Builder().addConverterFactory(GsonConverterFactory.create()).baseUrl(BASE_URL).build();
                service = retrofit.create(PokemonAPI.class);
                return service;
            } else{
                return service;
            }
        }
    }
}