scrollView.getScrollY() always returns 0

Question

I want to know when my ScrollView is scrolled to the top. This is what I tried:

  scrollView.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {

            @Override
            public void onScrollChanged() {
                int scrollX = scrollView.getScrollX(); //for horizontalScrollView
                int scrollY = scrollView.getScrollY();
                Log.d("TagFragment", "scrollY" + scrollY);
                mainFragment.setCanPullToRefresh(scrollY == 0);
            }
        });

the problem is: scrollY is nearly always 0. so it returns nearly always true. Some values are correct:

logcat:

D/TagFragment﹕ scrollY242
D/TagFragment﹕ scrollY0
D/TagFragment﹕ scrollY0
D/TagFragment﹕ scrollY0
D/TagFragment﹕ scrollY0
D/TagFragment﹕ scrollY0
D/TagFragment﹕ scrollY244
D/TagFragment﹕ scrollY0
D/TagFragment﹕ scrollY0
D/TagFragment﹕ scrollY0
D/TagFragment﹕ scrollY0
D/TagFragment﹕ scrollY0
D/TagFragment﹕ scrollY245
D/TagFragment﹕ scrollY0
D/TagFragment﹕ scrollY0
D/TagFragment﹕ scrollY0
D/TagFragment﹕ scrollY0
D/TagFragment﹕ scrollY0
D/TagFragment﹕ scrollY246
D/TagFragment﹕ scrollY0

how can I know 100% precisely what the offset is?

check this: http://stackoverflow.com/questions/3327087/how-to-get-the-current-y-offset-of-a-scrollview — The Badak, Aug 10 '15 at 02:45

scrollView.getScrollY() always returns 0

0 Answers0