loadShortUrl.java

public void loadShortUrl(String url, final ShortUrlCallBack callBack) {
    Call<ShortUrlResult> call = mNaverService.getShortUrl(url);
    call.enqueue(new Callback<ShortUrlResult>() {
        @Override
        public void onResponse(Call<ShortUrlResult> call, Response<ShortUrlResult> response) {
            if (callBack != null) {
                if (response.body() != null) {
                    callBack.onShortUrlSuccess(response.body().getResult());
                } else {
                    callBack.onShortUrlFail();
                }
            }
        }

        @Override
        public void onFailure(Call<ShortUrlResult> call, Throwable t) {
            if (callBack != null) {
                callBack.onShortUrlFail();
            }
        }
    });
}