Hide FAB in NestedScrollView when scrolling

Question

I am having a nestedscrollview with content like some linearlayouts and textviews. I am using a floatingactionbutton library for some reasons, as well. So I can\'t use any behav

Answer 1

define variable type int in your Activity or fragment to set previous Scroll from ScrollView then use this method to listen change scroll in ScrollView Class

 scrollView.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
        @Override
        public void onScrollChanged() {

    // previousScrollY this variable is define in your Activity or Fragment
            if (scrollView.getScrollY() > previousScrollY && floatingActionButton.getVisibility() == View.VISIBLE) {
                floatingActionButton.hide();
            } else if (scrollView.getScrollY() < previousScrollY && floatingActionButton.getVisibility() != View.VISIBLE) {
                floatingActionButton.show();
            }
            previousScrollY = scrollView.getScrollY();
        }
    });

will work done all version of android