Apk Android OBDII

We wish Development Smartphone Android with open source. You must communicate with the OBDII system for gasoline vehicles, considering all existing protocols for OBDII and manufacturers. It must be developed from the Bluetooth app chat (open source) available on the Internet. The application must have the matching capacity with any ELM 327 (Bluetooth / converter OBDII). The application after pairing should monitor the real-time vehicle speed (rpm) and consumption (may be via the text box). Only that. The application should be developed with open source Android so we can change the source code according to our need. We need price around US $ 150.00 ...