DepthPageTransformer.java

package com.bigfat.viewpageranim;

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

import com.nineoldandroids.view.ViewHelper;

public class DepthPageTransformer implements ViewPager.PageTransformer {
    private static final float MIN_SCALE = 0.75f;

    public void transformPage(View view, float position) {
        Log.i("TAG", "view--->" + view + "  position--->" + position);
        int pageWidth = view.getWidth();

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

        } else if (position <= 0) { // [-1,0]
            // Use the default slide transition when moving to the left page
//            view.setAlpha(1);
            ViewHelper.setAlpha(view, 1);
//            view.setTranslationX(0);
            ViewHelper.setTranslationX(view, 0);
//            view.setScaleX(1);
            ViewHelper.setScaleX(view, 1);
//            view.setScaleY(1);
            ViewHelper.setScaleY(view, 1);

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

            // Counteract the default slide transition
//            view.setTranslationX(pageWidth * -position);
            ViewHelper.setTranslationX(view, pageWidth * -position);

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

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