title: Make a callback for a service
body: <p>Im using this tutorial here <a href="http://blog.blundell-apps.com/simple-inapp-billing-payment/" rel="nofollow">Tut</a> to have inApp purchasing.  My problem is I cant seem to figure out how to call a function in my main activity once the service is connected.  Im trying to check if i need to restoreTransactions once the service is connected.</p>