Development Android device suggestion

I need to convert my cinder ios app (Augmented Theatre on app store), to android.

Since I’ve never touched an Android device in my life (except my gf’s phone, when she asked to take a picture of her with the ducks), I am at loss as to what to use for the development.

On the other hand, I already have a raspberry pi 2, which, I gather, can run android os.

Is it practical to use android raspberry pi 2 for this project, hoping it will work on android phones, once it reaches the (whatever) store?

Or, do I rather get one of those inexpensive (around 100 USD) tablets?

Thanks for your suggestions.