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How to remove exif tags using Android ExifInterface

I am currently working on an Android app that has a feature to remove EXIF ​​tags. The Android built-in library (android.media.ExifInterface) does not allow this. This is only possible for editing existing values. So I thought I could overwrite them with an empty value like empty string, space, zero. The tags in the EXIF ​​spec are of different types and I cannot overwrite them with the same value.

See: http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html

After some testing, I replaced the data with the blank values ​​below (in the format they were shown at the beginning). In the comments, I have indicated the types of the corresponding tags.

private static final Map<String, String> emptyValues = new HashMap<String, String>();
static {
    emptyValues.put(ExifInterface.TAG_APERTURE, "0"); //rational64u
    emptyValues.put(ExifInterface.TAG_DATETIME, ""); //string
    emptyValues.put(ExifInterface.TAG_EXPOSURE_TIME, "0.0000" ); //rational64u
    emptyValues.put(ExifInterface.TAG_FLASH, "0" ); //int16u
    emptyValues.put(ExifInterface.TAG_FOCAL_LENGTH, " 0/0" ); //rational64u
    emptyValues.put(ExifInterface.TAG_GPS_ALTITUDE, "0/0" ); //rational64u
    emptyValues.put(ExifInterface.TAG_GPS_ALTITUDE_REF, "0" ); //string[2]
    emptyValues.put(ExifInterface.TAG_GPS_LATITUDE, "0/0,0/0000,00000000/00000" ); // rational64u
    emptyValues.put(ExifInterface.TAG_GPS_LATITUDE_REF, "0" ); //string[2]
    emptyValues.put(ExifInterface.TAG_GPS_LONGITUDE, "0/0,0/0,000000/00000 " ); //rational64u
    emptyValues.put(ExifInterface.TAG_GPS_LONGITUDE_REF, "0" ); //sting[2]
    emptyValues.put(ExifInterface.TAG_GPS_TIMESTAMP, "0:0:0 " ); //rational64u[3]
    emptyValues.put(ExifInterface.TAG_GPS_PROCESSING_METHOD, "0" ); //undef
    emptyValues.put(ExifInterface.TAG_GPS_DATESTAMP, " " ); //string[11]
    emptyValues.put(ExifInterface.TAG_IMAGE_LENGTH, "0" ); //int32u
    emptyValues.put(ExifInterface.TAG_IMAGE_WIDTH, "0" ); //int32u
    emptyValues.put(ExifInterface.TAG_ISO, " " ); //int16u
    emptyValues.put(ExifInterface.TAG_MAKE, " " ); //string
    emptyValues.put(ExifInterface.TAG_MODEL, " " ); //string
    emptyValues.put(ExifInterface.TAG_WHITE_BALANCE, " " ); //string
    emptyValues.put(ExifInterface.TAG_ORIENTATION, " " ); // int16u
}

Is this a good approach? Is there a smarter way?

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Is it possible to just load the image into an Android bitmap and then save the Bitmap to a new file? Bitmap objects do not store EXIF ​​data, so this will delete EXIF ​​data. The disadvantage of this method is, of course, that you have to compress it again and you may lose a little image quality.



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