My name is Jozsef Kiraly, and I'm currently a Computer Science senior student at University College Nordjylland. My studies cover Android development extensively, and I've worked with mockup to final layout on multiple occasions, including personal projects too.
Conversion from mockup to layout is relatively fast unless there's some custom functionality that needs to be coded. I'm fairly certain that my 5 years experience with Android is more than enough to successfully complete this project to your liking. With my major being UI/UX design and concentrated around mobile technologies, I've already had some experience with the topic.
Your case does not sound too hard of a nut to crack, but again it depends on the complexity. If we could discuss the details, I could give a better estimate based on facts instead of speculation.
Thank you for your consideration, and hope to work with you soon!