title: AlphaAnimation does not work
body: <p>I have been looking for a solution to my problem. But my code seems to be ok. </p>
  
  <p>I'll try to explain: I have a TextView with android:alpha="0" in my layout definition. I want (when a image is clicked) show that TextView with an AlphaAnimation, from 0.0f to 1.0f.</p>
  
  <p>My problem is that when I click the image, nothing happens. But the strange thing, is that if I set it's alpha to 1 in the layout definition, and I click the image, I can see the animation (alpha 1 -> alpha 0 -> alpha 1).</p>
  
  <p>What am I doing wrong?</p>
  
  <p>My code:</p>
  
  <pre><code>TextView tv = (TextView) findViewById(R.id.number);
  
  AlphaAnimation animation1 = new AlphaAnimation(0.0f, 1.0f);
  animation1.setDuration(1000);
  animation1.setFillAfter(true);
  tv.startAnimation(animation1);
  </code></pre>
  
  <p>Thanks in advance.</p>