I am writing an Android photo sharing app, and pondering whether I should implement Extensible Metadata Platform reading from pictures taken by the smartphone/tablet/device's.
If almost no smartphone writes XMP data, then I don't need to waste my time implementing that.
So, I would welcome any data about XMP implementation in smartphones. Ideally the percentage of smartphone-taken pictures that embed XMP data, ideally per year and per country. Single numbers such as "the XYZ phone/OS embeds XMP and had a X% market share in Indonesia in 2015" are welcome too.