title: the seekTo() function doesn't work in VideoView
body: <p>There is a problem in my application,I want to use the <code>seekTo()</code> function with <code>VideoView</code> like this:</p>
  <pre><code>videoView.seekTo(time);
  videoView.start();
  </code></pre>
  <p>It works well in <code>android 2.2</code> ,but doesn't work in <code>android 2.3</code> or higher version...
  Some body will tell me why? It troubles me for serval days.</p>