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Android APIs
Added in API level 9
package

android.nfc

Provides access to Near Field Communication (NFC) functionality, allowing applications to read NDEF message in NFC tags. A "tag" may actually be another device that appears as a tag.

For more information, see the Near Field Communication guide.

Here's a summary of the classes:

NfcManager
This is the high level manager, used to obtain this device's NfcAdapter. You can acquire an instance using getSystemService(String).
NfcAdapter
This represents the device's NFC adapter, which is your entry-point to performing NFC operations. You can acquire an instance with getDefaultAdapter(), or getDefaultAdapter(android.content.Context).
NdefMessage
Represents an NDEF data message, which is the standard format in which "records" carrying data are transmitted between devices and tags. Your application can receive these messages from an ACTION_TAG_DISCOVERED intent.
NdefRecord
Represents a record, which is delivered in a NdefMessage and describes the type of data being shared and carries the data itself.

Note: Not all Android-powered devices provide NFC functionality.

Interfaces

NfcAdapter.CreateBeamUrisCallback  
NfcAdapter.CreateNdefMessageCallback A callback to be invoked when another NFC device capable of NDEF push (Android Beam) is within range. 
NfcAdapter.OnNdefPushCompleteCallback A callback to be invoked when the system successfully delivers your NdefMessage to another device. 
NfcAdapter.ReaderCallback A callback to be invoked when the system finds a tag while the foreground activity is operating in reader mode. 

Classes

NdefMessage Represents an immutable NDEF Message. 
NdefRecord Represents an immutable NDEF Record. 
NfcAdapter Represents the local NFC adapter. 
NfcEvent Wraps information associated with any NFC event. 
NfcManager High level manager used to obtain an instance of an NfcAdapter. 
Tag Represents an NFC tag that has been discovered. 

Exceptions

FormatException  
TagLostException