onScrollChanged.java

@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
    if(scrollListener != null) {
        View view = (View) getChildAt(getChildCount()-1);
        int diff = (view.getBottom()-(getHeight()+getScrollY()));
        if(diff == 0) {
            if (!scrollLock) {
                setScrollLock(true);
                scrollListener.onScrollChanged(l, t, oldl, oldt, diff);
            }
        } else {
            setScrollLock(false);
        }
    }
    super.onScrollChanged(l, t, oldl, oldt);
}

public void setScrollLock(boolean lock) {
        scrollLock = lock;
}