I'm thinking of releasing a "PRO" (ad-free) version for my android application and I'm worried that the apk would be shared on blogs/crack sites for free distribution
is there a way to add some kind a purchase check? Since the app will be available for purchase only, there should be a way to check the user's purchase history maybe?
If the user hasn't purchased the app and is using it the app would show a message that they haven't bought it properly and would shut down.