private void fetchMovieImages(final int callingId, String parameter) { Preconditions.checkNotNull(parameter, "id cannot be null"); MovieWrapper movie = MMoviesApp.get().getState().getMovie(parameter); if (movie != null && movie.getTmdbId() != null) { executeNetworkTask(new FetchMovieImagesRunnable(callingId, movie.getTmdbId())); } }