title: Android In App Billing Restore Transaction
body: <p>My scenario of In App Billing implementation:
  1. The Home screen shows the list of products which I am planning to sell.
  2. The detail screen (Screen shown on selecting a list item in home screen) will have the option to buy that product.</p>
  
  <p>My understanding is that , Restore transaction request and request to check if InAppBilling is supported will have to be done in the Home screen activity. And the remaining requests(to initiate purchase etc) should be done on detail screen activity. Is this understanding correct?</p>
  
  <p>If yes, how should i modify the Dungeons example to seperate out and implement on home screen activity, the two sets of requests which i need not do every time i navigate to the detail screen activity. Will i have to create seperate instances of purchase observer and related classes in both these activities?</p>