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If you want to integrate your barcode reader into your apk completelly, then you can use commercial android barcode api library like quickmarck or sd-toolkit ... Second one even royalty free, at least it was before.
I'd recommend using a barcode scanner SDK that also decodes barcodes in blurry images, such as our Scandit barcode scanner SDK for Android. There are lots of Android devices that have only a fixed focus camera and most (if not all) open source barcode scanner solutions do not support barcode scanning on such devices.
The Scandit barcode scanner SDK also comes with a free community edition and a product API that helps converting the barcode numbers into product names.