How to save GPS coordinates in exif data on Android?

Question

I am writing GPS coordinates to my JPEG image, and the coordinates are correct (as demonstrated by my logcat output) but it appears that it\'s being corrupted somehow. Readi

Answer 1

Here is some code I've done to geotag my pictures. It's not heavily tested yet, but it seems to be ok (JOSM editor and exiftool read location).

ExifInterface exif = new ExifInterface(filePath.getAbsolutePath());
exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE, GPS.convert(latitude));
exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE_REF, GPS.latitudeRef(latitude));
exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE, GPS.convert(longitude));
exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF, GPS.longitudeRef(longitude));
exif.saveAttributes();

And class GPS is here. (method could be shorter, but it's readable at least)

/*
 * @author fabien
 */
public class GPS {
    private static StringBuilder sb = new StringBuilder(20);

    /**
     * returns ref for latitude which is S or N.
     * @param latitude
     * @return S or N
     */
    public static String latitudeRef(double latitude) {
        return latitude<0.0d?"S":"N";
    }

    /**
     * returns ref for latitude which is S or N.
     * @param latitude
     * @return S or N
     */
    public static String longitudeRef(double longitude) {
        return longitude<0.0d?"W":"E";
    }

    /**
     * convert latitude into DMS (degree minute second) format. For instance

     * -79.948862 becomes

     *  79/1,56/1,55903/1000

     * It works for latitude and longitude

     * @param latitude could be longitude.
     * @return
     */
    synchronized public static final String convert(double latitude) {
        latitude=Math.abs(latitude);
        int degree = (int) latitude;
        latitude *= 60;
        latitude -= (degree * 60.0d);
        int minute = (int) latitude;
        latitude *= 60;
        latitude -= (minute * 60.0d);
        int second = (int) (latitude*1000.0d);

        sb.setLength(0);
        sb.append(degree);
        sb.append("/1,");
        sb.append(minute);
        sb.append("/1,");
        sb.append(second);
        sb.append("/1000");
        return sb.toString();
    }
}