void loadMovies(String sortBy) {
    call = service.getMovies(sortBy, StringConstants.API_KEY);
    call.enqueue(
        new Callback<MovieResponse>() {
          @Override
          public void onResponse(Response<MovieResponse> response, Retrofit retrofit) {
            movieResponse = response.body();
            mImageAdapter = new ImageAdapter(getActivity(), mBaseUrl, movieResponse.movies);
            mMovieGrid.setAdapter(mImageAdapter);
          }

          @Override
          public void onFailure(Throwable t) {
            Toast.makeText(getActivity(), getString(R.string.cannot_load), Toast.LENGTH_LONG)
                .show();
          }
        });
  }