Interchange mVf.showPrevious() with mVf.showNext() and mVf.showNext() with mVf.showPrevious() in your onFling method and it should solve your issue.
Below is the explanation for the solution. Case 1: Where e1.getX() > e2.getX(), means swipe from right to left (show the next page). Here you should use mVf.showNext() Case2: Where e1.getX() < e2.getX(), means swipe from left to right (show the previous page). Here you should use mVf.showPrevious()