content: package com.amatellanes.android.examples.transformers;
  
  import android.support.v4.view.ViewPager;
  import android.view.View;
  
  public class DepthPageTransformer implements ViewPager.PageTransformer {
  	private static float MIN_SCALE = 0.75f;
  
  	public void transformPage(View view, float position) {
  		int pageWidth = view.getWidth();
  
  		if (position < -1) { // [-Infinity,-1)
  			// This page is way off-screen to the left.
  			view.setAlpha(0);
  
  		} else if (position <= 0) { // [-1,0]
  			// Use the default slide transition when moving to the left page
  			view.setAlpha(1);
  			view.setTranslationX(0);
  			view.setScaleX(1);
  			view.setScaleY(1);
  
  		} else if (position <= 1) { // (0,1]
  			// Fade the page out.
  			view.setAlpha(1 - position);
  
  			// Counteract the default slide transition
  			view.setTranslationX(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);
  			view.setScaleY(scaleFactor);
  
  		} else { // (1,+Infinity]
  			// This page is way off-screen to the right.
  			view.setAlpha(0);
  		}
  	}
  }