How to know viewpager is scroll left or right?

Question

I am using ViewPager (support library). I want to know every time the ViewPager change the visible page, it is scrolling left or right.

Please give me a solution. An

Answer 1

You can keep class member variable to save last visited page

private int mLastVisitedPageIndex = 0;

Then use following function to check direction

@Override
public void onPageSelected(int i) {
    boolean isMovingForward = mLastVisitedPageIndex < i?true:false;
    //Use isMovingForward variable anywhere now
    mLastVisitedPageIndex = i;
}