I'm looking for a way to read GS1 DataBar style barcodes from an Android app. Has anyone tried that? Are there any open source barcode scanner projects that I can take advantage of to read GS1 barcodes?
Yes
http://code.google.com/p/zxing/
That will scan GS1 codes, but GS1 isn't a bar code format as much as its a format of the number encoded into the barcode. Processing what those numbers mean is outside zxing's realm.
http://helpdesk.gs1.org/ArticleDetails.aspx?id=d5ac7325-e5cc-496d-b821-c209f4718536