Android Speedometer&map

I need a Speedometer application & a map display on Android(4.0) The application should display 2 fragments . one on top of the other. The upper one should contain a Google map with the current location of the mobile phone. The lower should contain a speedometer that shows the current speed. Both map& speedometer should display accurate results as much as possible using GPS lock. Both tasks are very trivial. one additional requirement is to separate the UI code from the location & speed calculation code, as expected from any real programmer. That's it.