Android On the Spot is a family of Android modules that can provide locations (restaurants, retail locations, entertainment destinations, schools, etc.) with the ability to quickly, easily and securely deploy Android applications relevant to their visiting clientèle. It’s all as easy as taking a picture.

This is where QR code comes in. Emerging mobile systems are already making use of QR code and other visual code formats. They are a perfect way to exchange information in situations where network packets are not viable, though so far their potential has not been fully realized. By serializing Intents and encoding them in QR code, we can use QR codes in many other interesting ways.

http://code.google.com/p/androidonthespot/