public void snapToPage(final int whichPage, int duration) {
		snapToPage(whichPage, TOP, duration);
	}
Snap pager to the specified page.

@param whichPage
           Zero based index of the page.
@param duration
           Duration in milliseconds of scrolling to the chosen page.
app/src/main/java/pro/alexzaitsev/freepager/library/view/core/VerticalPager.java