AndroidRetrofit.java

class Factory {
    public static Api create() {
        OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
        if (BuildConfig.DEBUG) {
            HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
            logging.setLevel(HttpLoggingInterceptor.Level.BODY);
            httpClient.addInterceptor(logging);
        }
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(BASE_URL)
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .addConverterFactory(JacksonConverterFactory.create(new ObjectMapper()))
                .client(httpClient.build())
                .build();
        return retrofit.create(Api.class);
    }
}