Sharing a subscriber class between two observables

HomePresenter.java

public class HomePresenter extends BasePresenter<HomeView> {
    ArticleRepo articleRepo;

    @Inject
    public HomePresenter(ArticleRepo articleRepo) {
        this.articleRepo = articleRepo;
    }

    @Override
    public void onCreate(@Nullable PresenterBundle bundle) {
        super.onCreate(bundle);
    }


    public void onEvent(ArticleCategoryClickedEvent event) {
        Timber.v("Adapter position clicked at position: '%d'", event.getAdapterPosition());
        view.launchArticleActivity(event.getArticleCategory());
    }

    public void onEvent(SeabeeOnlineExternalLinkClickedEvent event) {
        view.launchExternalLink(event.getSeabeeOnlineExternalLink());
    }

    public void loadArticleImages() {
        articleRepo.getArticleBuckets()
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(subscriber);
    }

    public void refreshData() {
        articleRepo.refreshAndSaveArticles()
                .flatMap(new Func1<List<ArticleEntity>, Observable<List<ImageArticleCategoryEntity>>>() {
                    @Override
                    public Observable<List<ImageArticleCategoryEntity>> call(List<ArticleEntity> articleEntityList) {
                        return articleRepo.getArticleBuckets();
                    }
                }).subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(subscriber);

    }

    final Subscriber<List<ImageArticleCategoryEntity>> subscriber = new Subscriber<List<ImageArticleCategoryEntity>>() {
        @Override
        public void onCompleted() {
            Timber.v("Loading article images complete!");
            view.hideLoadingAnimation();
        }

        @Override
        public void onError(Throwable e) {
            Timber.e("Error loading article images", e);
            Log.e("tag", "Error loading article images", e);
        }

        @Override
        public void onNext(List<ImageArticleCategoryEntity> integerImageArticleCategoryEntityHashMap) {
            view.loadArticleImages(integerImageArticleCategoryEntityHashMap);
        }
    };
}