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This question originated here: Writing EXIF metadata to images in Android .

Can we use EXIF to write arbitrary metadata, i.e. other than those specified in the ExifInterface documentation (like latitude, longitude, flash etc). If not, what could be a preferred method of writing arbitrary metadata to image files?

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The ExifInterface is only a very limited implementation of the EXIF standard and will not allow you to read/write tags other than the ones documented/defined. In the chosen answer of this post an alternative method is described.

Arbitrary data could be written to one of the following tags

Tag-hex Tag-dec IFD Key Type 0x010e 270 Image Exif.Image.ImageDescription Ascii 0x9286 37510 Photo Exif.Photo.UserComment Comment

whereby UserComment has less restrictions regarding the character set used

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2 Comments

I cannot test this now, but I'm marking this as an answer because it seems reasonable to me that the suggested approach would work.
You can always remove the mark later if it turns out it didn't fly or someone provided a better solution ... good luck!

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