Simple RecyclerView.OnScrollListener with RxJava subjects

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public class RecyclerSimpleScrollListener extends RecyclerView.OnScrollListener {
    private final SerializedSubject<Direction, Direction> scrollBus;

    public RecyclerSimpleScrollListener() {
        scrollBus = new SerializedSubject<>(PublishSubject.<Direction> create());
    }

    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);
        if (0 < dy) {
            scrollBus.onNext(Direction.DOWN);
        } else if (0 > dy) {
            scrollBus.onNext(Direction.UP);
        } else if (0 == dy) {
            scrollBus.onNext(Direction.NEUTRAL);
        }
    }

    public Observable<Direction> getDirectionObservable() {
        return scrollBus.onBackpressureDrop().distinctUntilChanged().asObservable();
    }

    public enum Direction {
        UP, DOWN, NEUTRAL
    }
}

Neat. I am only using Rx with network calls. I'm not sure if I should handle the UI with Subjects or just deal with normal listeners. I really like how you are handling the touch events in getDirectionObservables(). Less code as well.