how to test the presence of an application on a android smartphone
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/3694267/android-check-for-presence-of-another-app">Android - check for presence of another app</a>  </p>
</blockquote>



<p>How to check if an application is installed on the smartphone?
For my application, I need to know if Facebook and Twitter are installed on the smartphone.To see if I can use them.</p>
