Welcome
I'm and android developer who has good experience programming android apps to work with 3rd devices like cardreaders. Also I have programmed to many apps and I can ensure you that we can make great native android app.
I've read your file and it seems that it's a funny job ( especially if I'm gonna get one of those robots :) )
However, i will be glad to work with you and I can pass any problem faces me while working quickly, and I can start your job immediately .
Best regards,,,
Ibrahim radwan