Blueberry is an application that uses the phone's Bluetooth feature to connect to a Bluetooth enabled device. It is mainly intended to control mobile platforms such as an Arduino with a Bluetooth shield mounted on a platform with two motorized wheels.
Additionally it uses the phone's camera, internet connection and sensors to interact with the mobile platform.
Source code: https://github.com/Nurgak/Android-Bluetooth-Remote-Control
Arduino source source: https://github.com/Nurgak/Android-Bluetooth-Remote-Control/tree/master/Arduino-Bluetooth