title: Animate layout_weight change
body: <p>Is it possible to animate a layout_weight change of a View?</p>
  
  <p>I have tried: </p>
  
  <blockquote>
    <p>ObjectAnimator anim = ObjectAnimator.ofFloat(headerRoot,
    "layout_weight", ws, 1f);
            anim.setDuration(1500);
            anim.addUpdateListener(this);
            anim.start();</p>
  </blockquote>
  
  <p>This has no effect on my layout. Is the objectAnimator able to manipulate the layout_weight property of a view?</p>