I have put up an Instructable (http://www.instructables.com/id/Simple-Remote-Data-Plotting-using-Android-Arduino-/) and a web page (http://www.forward.com.au/pfod/pfodDataLogging/index.html) on a simple way to plot and save sensor data from your Arduino project on an Android mobile.
Basically you just send the data in CSV format to the mobile via bluetooth or wifi and then tell the pfodApp what to plot. No Android programming is required, the Arduino sketch controls everthing, which data stream to plot, which fields, plot scaling etc.
See the pfodSpecification (http://www.forward.com.au/pfod/pfodSpecification.pdf) for detailed examples.
The data is also saved to a file on your mobile for later downloading to your computer.
See www.pfod.com.au for examples of the other uses of pfodApp. The same app is used for all the projects, since the Arduino sketch controls what is displayed to the user on their mobile.