title: How to know which libraries are being used in an android app
body: <p>I've just seen that AppBrain site gets statistics about which are the most popular dev libraries in the android market. </p>
  
  <p><a href="http://www.appbrain.com/stats/libraries/dev" rel="nofollow">http://www.appbrain.com/stats/libraries/dev</a></p>
  
  <p>So I guess that having the app apk is it possible to know which libraries are being used in that app. Do you have any idea  how this can be done?</p>