Board Thread:Game Discussion/@comment-84.108.120.106-20141206171458/@comment-9890645-20141207063803

Um... I've had my main account logged in on two different iPads at once. (Note: You can only play on one device at a time. In my case, I use one iPad at work and a different one at home, and my account was the active account on both simultaneously.)

Unless there is an Android-specific issue of which I am unaware, you should be able to just log in on the new device with your gamer ID and password.