Like it has been explained before neither Apple nor Google allow to activate a product that has been purchased outside their stores. I have no possibility to go around this without violating agreements, so I am afraid if you move from iOS to Android or vice-versa you need to purchase again.
You can save and restore from cloud to keep your saved games, at least.
Also, the support subforum can't deal with unofficial emulation, as I don't support it. There is a thread in the general forum about playing on android emulators, please check there.