With the Barcode Scanner application for Android we can read the bar codes in 2D and the QR codes increasingly used.
As you may have noticed, QR codes are used enough to download some applications, and as here we’re going to use it much, it is recommended that you download and install it.
In this video we watch how it works
Also we can generate QR codes of our contacts to another people can scan the code and add the contact. Press the Menu> Show bar code when we’re viewing a contact in our address book.
Barcode Scanner is available in Android Market.