Question

I have two activities: MainActivity extends ListActivity and Preferences implements BillingController.IConfiguration.

Now I need to call BillingController.someMethod(this) at MainActivity. Such call can be made only if MainActivity implements BillingController.IConfiguration. But this is already implemented at Preferences class. What can I do to avoid implementing that again?

Answer 1

Make a class that implements BillingController.IConfiguration and use it inside both MainActivity and Preferences to delegate method calls to it.