I was thinking about Mycelium but I'm not sure whether It's still a good option or not yet.
If you visit
Mycelium board, there are some problems reported periodically, but most users still have a positive opinion when it comes to this wallet. They have bug with 0 balance which some users report, and I do not know if this is completely solved.
If you need only bitcoin wallet for android, then pooya87 advice is probably best, it is well known and easy to handle wallet.