HorizontalScrollView hscr = (HorizontalScrollView) findViewById(R.id.hscroll);
        hscr.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
            @Override
            public void  onScrollChanged() {

                HorizontalScrollView hscr = (HorizontalScrollView) findViewById(R.id.hscroll);
                if (hscr.getScrollX() == 0) {
                    
                } else {
                    
                }


            }
        });