title: Get an instance of activity that starts another from intent
body: <p>Is there a way to get an instance of the activity that has called the currently running activity from the intent object that has been passed to it?
  eg. if A has called B, I would like to retrieve A's instance from the intent in B's onCreate method.
  As Activity is not Serializable i am not able to pass the instance in the extras bundle.
  Any help on this would be great</p>
  
  <p>Thanks.</p>