title: Is there any DLL or DLL like concept in Android?
body: <ol>
  <li><p>We know that we can use a concept "Java Package", but I just wanted to
  know whether Android has provided a DLL or DLL like concept where we can write a 
  most of the functionality.</p></li>
  <li><p>Or can we use <em>Activity</em> for serving a purpose of DLL.</p></li>
  </ol>
  
  <p>Is there any concept like DLL on Android OS? Can we develop a DLL for better modularization and other benefits on Android?</p>
  
  <p>Thanks and Regards,
  Prashant.</p>