title: Android Indeterminate Progress Bar not animated
body: <p>I want a infinite progress bar like here under Activity Indicatior, Activity bar</p>
  
  <p><a href="http://www.google.de/imgres?um=1&amp;hl=de&amp;client=firefox-a&amp;hs=H9I&amp;tbo=d&amp;rls=org.mozilla:de:official&amp;biw=1280&amp;bih=697&amp;tbm=isch&amp;tbnid=AX0X8So5n4iiPM:&amp;imgrefurl=http://developer.android.com/design/building-blocks/progress.html&amp;docid=8Hr06JHpY9T3rM&amp;imgurl=http://developer.android.com/design/media/progress_download.png&amp;w=760&amp;h=348&amp;ei=bDDgULSzELL64QTa74DgBg&amp;zoom=1&amp;iact=rc&amp;dur=318&amp;sig=116802181569187224100&amp;page=2&amp;tbnh=143&amp;tbnw=265&amp;start=35&amp;ndsp=40&amp;ved=1t:429,r:51,s:0,i:243&amp;tx=131&amp;ty=39" rel="noreferrer">http://www.google.de/imgres?um=1&amp;hl=de&amp;client=firefox-a&amp;hs=H9I&amp;tbo=d&amp;rls=org.mozilla:de:official&amp;biw=1280&amp;bih=697&amp;tbm=isch&amp;tbnid=AX0X8So5n4iiPM:&amp;imgrefurl=http://developer.android.com/design/building-blocks/progress.html&amp;docid=8Hr06JHpY9T3rM&amp;imgurl=http://developer.android.com/design/media/progress_download.png&amp;w=760&amp;h=348&amp;ei=bDDgULSzELL64QTa74DgBg&amp;zoom=1&amp;iact=rc&amp;dur=318&amp;sig=116802181569187224100&amp;page=2&amp;tbnh=143&amp;tbnw=265&amp;start=35&amp;ndsp=40&amp;ved=1t:429,r:51,s:0,i:243&amp;tx=131&amp;ty=39</a></p>
  
  <p>My implementation is not animated and not spinning. What is wrong? Thanks</p>
  
  <pre><code>&lt;ProgressBar
      android:id="@+id/progressBar"
      style="?android:attr/progressBarStyleHorizontal"
      android:layout_width="match_parent"
      android:layout_height="wrap_content" /&gt;
  </code></pre>