[DuckieTigger]

Not sure about Android, but for your computer you can use Calibre. It lets you add Books by simply providing the ISBN. You can even add multiple at once if you have one ISBN per line. If you so choose, it will automatically download description and cover image. It is also great for your ebooks, of course.

Not sure if it has the ability to export your library information in a format that lets you see it conveniently on your phone. Better ask that in the calibre forum.

Edit: You cannot scan the ISBN as the barcode in the back of the book is the UPC, not the ISBN.