title: Android Application APK signing?
body: <p>I would like to know about Android application signing. </p>
  
  <p>IFAIK, blackberry and iphone application must be signed to work on the real device. 
  For the Android, does application need to sign ?</p>
  
  <p>If so, how to sign the application ?</p>
  
  <p>Please advice. guys.</p>
  
  <p>Thanks in advance.</p>