VerticalFlipTransformation Animation in Vieepager

VerticalFlipTransformation.java

package example.andrdoitechweb.viewpagertransformer.Transformation;

import android.support.v4.view.ViewPager;
import android.view.View;

public class VerticalFlipTransformation implements ViewPager.PageTransformer {
    @Override
    public void transformPage(View page, float position) {

        page.setTranslationX(-position * page.getWidth());
        page.setCameraDistance(12000);

        if (position < 0.5 && position > -0.5) {
            page.setVisibility(View.VISIBLE);
        } else {
            page.setVisibility(View.INVISIBLE);
        }



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

        }
        else if (position <= 0) {    // [-1,0]
            page.setAlpha(1);
            page.setRotationY(180 *(1-Math.abs(position)+1));

        }
        else if (position <= 1) {    // (0,1]
            page.setAlpha(1);
            page.setRotationY(-180 *(1-Math.abs(position)+1));

        }
        else {    // (1,+Infinity]
            // This page is way off-screen to the right.
            page.setAlpha(0);

        }


    }
}