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Source: Me, StackOverflow

Question: how to detect when a ScrollView stop scrolling?

Answer:

private ScrollView mScrollView;
private float lastY;

mScrollView = (ScrollView)findViewById(R.id.find_friend_scroll_view);
mScrollView.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
    @Override
    public void onScrollChanged() {
        if(lastY < mScrollView.getY() || lastY > mScrollView.getY()){
            //scrollView is scrolling, do your stuff here
            if (!isMenuFading()) {
                fadeMenuOut();
                lastY = mScrollView.getY();
            }
        }else{
            //scrollView stop
            fadeMenuIn();
        }
    }
});