public void setOnScrollChangeListener(OnScrollChangeListener l) {
        mOnScrollChangeListener = l;
    }
Register a callback to be invoked when the scroll X or Y positions of
this view change.
<p>This version of the method works on all versions of Android, back to API v4.</p>

@param l The listener to notify when the scroll X or Y position changes.
@see View#getScrollX()
@see View#getScrollY()
app/src/main/java/home/smart/fly/animations/widget/NestedScrollView.java