private void doScrollY(int delta) {
        if (delta != 0) {
            if (mSmoothScrollingEnabled) {
                smoothScrollBy(0, delta);
            } else {
                scrollBy(0, delta);
            }
        }
    }
Smooth scroll by a Y delta

@param delta the number of pixels to scroll by on the Y axis
app/src/main/java/home/smart/fly/animations/widget/NestedScrollView.java