title: import can not be resolved (android developer sample)
body: <ol>
  <li><p>I downloaded <a href="http://developer.android.com/training/monetization/ads-and-ux.html" rel="nofollow">sample from android developer</a> site.</p></li>
  <li><p>set up <a href="https://developer.android.com/tools/support-library/setup.html#add-library" rel="nofollow">android-support-v7-appcompact according to developer site</a>.</p></li>
  <li><p>Set up <a href="http://developer.android.com/google/play-services/setup.html#Setup" rel="nofollow">google-play-services_lib</a>.(sdk\extras\google\google_play_services) But the three imports can't be resolved.</p>
  
  <p><code>import com.google.ads.Ad;
  import com.google.ads.AdListener;
  import com.google.ads.AdView;</code></p></li>
  </ol>
  
  <p>Cleaned the project and restart the eclipse does nutting. Please can any one help me.</p>