I think you can find this solution with Google...
You can do:
Using java Syntax Highlighting
String myString = new Double(location.getLongitude()).toString();
addToGPSLog(myString);
Parsed in 0.029 seconds, using
GeSHi 1.0.8.4
or maybe
Using java Syntax Highlighting
addToGPSLog(location.getLongitude() + "");
Parsed in 0.030 seconds, using
GeSHi 1.0.8.4
Dalf