title: setAlpha not restore alpha value after animation
body: <p>As the title, if I change alpha of an <code>ImageView</code> by animation, then I can't set back by <code>setAlpha</code>:</p>
  
  <pre><code>ImageView myImage = (ImageView) findViewById(R.id.my_image);
  
  myImage.animate().alpha(0).withEndAction(new Runnable() {
      public void run() {
          myImage.setAlpha(100);
      }
  });
  </code></pre>
  
  <p>Animation is ok, but after this alpha of <em>myImage</em> is not set back by <code>setAlpha</code>, it's ever zero. Why?</p>