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This should be very simple to someone with android experience:
Pick the barcode scanner ZXING: http://code.google.com/p/zxing/
- Add a Button to Result - buttons
so it should be "Custom" "Product Search" "Search in Web" "Google Shopper"
- The custom button will lead to a custom URL (fill in whatever you like, we will replace it on our own).
- Required parameters sent to the custom URL are those you can define in the Custom URL thing (f=%f, s=%s, t=%t)
plus the geo coordinates! (Thats what you can not define in the custom button from the options.)
In short terms: A button that sends the EAN code + the geo coordinates to a custom url. Thats all.
Job is done once we got the fully working sourcecode.