It's difficult to get an app accepted by Google. The last time we tried they couldn't get their heads around the idea of a faucet and confused it with Proof of Work mining. We'll try again and hope that whoever gets to check it actually knows something about bitcoin next time.
In my opinion no app is needed, freebtc works perfectly in any device I've used (iphone, android phones, android tablet) simply using every built-in browser.