How to smoothen the swiping in viewpager

Question

In my application I'm using view pager for vertical scroll for swiping the pages. Vertical scrolling working fine. An issues is While swiping the pages,it is not swiping smoothly , it is stucking while swiping.Can Anyone give me solution for my issue. Thanks in advance.

public class VerticalViewPager extends ViewPager {
public VerticalViewPager(Context context) {
    super(context);
    init();
}

public VerticalViewPager(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
}
private void init() {
    // The majority of the magic happens here
    setPageTransformer(true, new VerticalPageTransformer());
    // The easiest way to get rid of the overscroll drawing that happens on the left and right
    setOverScrollMode(OVER_SCROLL_NEVER);
}
private static class VerticalPageTransformer implements PageTransformer {
    private static float MIN_SCALE = 0.95f;

    public void transformPage(View view, float position) {
        int pageWidth = view.getWidth();

        if (position < -1) { // [-Infinity,-1)
            // This page is way off-screen to the left.
            view.setAlpha(0);



        } else if (position <= 0) { // [-1,0]

            view.setAlpha(1);
            //view.setTranslationX(1);
            view.setScaleX(1);
            view.setScaleY(1);
            float yPosition = position * view.getHeight();
            view.setTranslationY(yPosition);
            view.setTranslationX(-1 * view.getWidth() * position);

        } else if (position <= 1) { // (0,1]
            // Fade the page out.
            view.setAlpha(1 - position);

            view.setTranslationX(-1 * view.getWidth() * position);

            // Scale the page down (between MIN_SCALE and 1)
            float scaleFactor = MIN_SCALE
                    + (1 - MIN_SCALE) * (1 - Math.abs(position));
            view.setScaleX(scaleFactor);
            view.setScaleY(scaleFactor);

        } else {
            view.setAlpha(0);
        }

    }
}

private MotionEvent swapXY(MotionEvent ev) {
    float width = getWidth();
    float height = getHeight();

    float newX = (ev.getY() / height) * width;
    float newY = (ev.getX() / width) * height;

    ev.setLocation(newX, newY);

    return ev;
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev){
    boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
    swapXY(ev);
    return intercepted;
}

@Override
public boolean onTouchEvent(MotionEvent ev) {
    return super.onTouchEvent(swapXY(ev));
}

}