RecyclerView 하단 감지, 스크롤 방향 감지

public abstract class HidingScrollListener extends RecyclerView.OnScrollListener {
    private static final int HIDE_THRESHOLD = 20;
    private int scrolledDistance = 0;
    private boolean controlsVisible = true;
 
    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);
        if (scrolledDistance > HIDE_THRESHOLD && controlsVisible) {
            onHide();
            controlsVisible = false;
            scrolledDistance = 0;
        } else if (scrolledDistance < -HIDE_THRESHOLD && !controlsVisible) {
            onShow();
            controlsVisible = true;
            scrolledDistance = 0;
        }
        if ((controlsVisible && dy > 0) || (!controlsVisible && dy < 0)) {
            scrolledDistance += dy;
        }
    }
 
    public abstract void onHide();
 
    public abstract void onShow();
 
}
 
/*스크롤 방향 감지 하여 툴바 히든 처리 할때 사용*/
recycler_view.setOnScrollListener(new HidingScrollListener() {
    @Override
    public void onHide() {
        Dlog.d("onHide");
    }
 
    @Override
    public void onShow() {
        Dlog.d("onShow");
    }
});
 
 
/*하단 감지*/
recycler_view.addOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
        super.onScrollStateChanged(recyclerView, newState);
        if (!recyclerView.canScrollVertically(1) && newState == RecyclerView.SCROLL_STATE_IDLE) {
            Dlog.d("bottom");
        }
    }
});