Hello there Sir,
I have done plenty of android apps, on this site and some of my own.
The bid and the price is approx.
Because, Want to see the nature and work required for the job first.
Anyhow, just chat with me so, I may let you know how and what may I need to do, to make your app ready, just as you want it to be.
Will be waiting for your reply.
THANKS