You don't do that, just use barcode https://world.openfoodfacts.org/ https://world.openfoodfacts.org/ they also have app in play store with scanner function. It

You don't do that, just use barcode https://world.openfoodfacts.org/ https://world.openfoodfacts.org/ they also have app in play store with scanner function. It is no brainer to build with existing barcode libraries.