Demo app to demonstrate the use of NFC / Android Beam.
What does it do?
Uses Android Beam™ to send a "Hello NFC" Message to another smartphone inside the app, which will show such message in a SnackBar. If the app is not installed, it will simply open the Play Store and search for the app.
In case putting together two phones on the back for a long time is not your cup of tea, you can also press a button and launch the app in Beam™ mode, so it can complete the transfer as soon as it detects another NFC device, instead of having to press the screen after putting them back to back.
- NFC Basics - Android Developers