title: Android - ViewPager.PageTransformer doesn't exist
body: <p>I'm following this tutorial <strong>Using ViewPager for Screen Slides</strong> <a href="http://developer.android.com/training/animation/screen-slide.html" rel="nofollow noreferrer">http://developer.android.com/training/animation/screen-slide.html</a>
  but I've problem.
  In other words, I want to implement ViewPager.PageTransform but this interface doesn't exist, like image shows.
  <img src="https://i.stack.imgur.com/Q5vzL.jpg" alt="enter image description here">  </p>
  
  <p>I put v13 support library and minTarget is 14.</p>