How to save GPS coordinates in exif data on Android?

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GPSLatitude

Indicates the latitude. The latitude is expressed as three
RATIONAL values giving the degrees,
minutes, and seconds, respectively.
If latitude is expressed as degrees,
minutes and seconds, a typical format
would be dd/1,mm/1,ss/1. When degrees
and minutes are used and, for
example, fractions of minutes are
given up to two decimal places, the
format would be dd/1,mmmm/100,0/1.

https://docs.google.com/viewer?url=http%3A%2F%2Fwww.exif.org%2FExif2-2.PDF

The Android docs specify this without explanation: http://developer.android.com/reference/android/media/ExifInterface.html#TAG_GPS_LATITUDE

Exif data is standardized, and GPS data must be encoded using geographical coordinates (minutes, seconds, etc) described above instead of a fraction. Unless it’s encoded in that format in the exif tag, it won’t stick.

How to encode: http://en.wikipedia.org/wiki/Geographic_coordinate_conversion

How to decode: http://android-er.blogspot.com/2010/01/convert-exif-gps-info-to-degree-format.html

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