Every book has a ISBN number, which's encoded in barcode, just like this one. You can see here, my book "Dealing with Darwin" has ISBN 971591842149.
Step 1: I write a small Android app "OrganizeMyStuff" , call to the Barcode Scanner App in my phone.
Step 2: Got the ISBN number, then my app search it from the Google Book.
Step 3: Finally, my app posts the book data to blogger.
You can see at this http://mybooks-database.blogspot.com/