Mycelium will be enabling Litecoin for its devices. Not sure how far along they are though. They had a fundraiser that finished about a month or two ago for this.
Would it be safe and dummy proof to get a cheap android phone and use it to store ltc I buy online with this app
https://play.google.com/store/apps/details?id=de.schildbach.wallet_ltc&hl=en
Personally, I would never trust an app. If you are looking for cold storage ideas for your LTC I would follow something like this https://litecointalk.org/index.php?topic=11819.0
Also, feel free to post on Litecointalk and see if anyone else had a better idea. I never have had a cold storage, so I cant really comment too much on the subject. Just point you in the right direction
.