File	Doc	Category	Size	Date	Package
NfcB.java	API Doc	Android 5.1 API	4403	Thu Mar 12 22:22:10 GMT 2015	android.nfc.tech

NfcB

• java.lang.Object
  • BasicTagTechnology

Fields Summary
public static final String	EXTRA_APPDATA
public static final String	EXTRA_PROTINFO
private byte[]	mAppData
private byte[]	mProtInfo

Constructors Summary
public NfcB(android.nfc.Tag tag) hide super(tag, TagTechnology.NFC_B); Bundle extras = tag.getTechExtras(TagTechnology.NFC_B); mAppData = extras.getByteArray(EXTRA_APPDATA); mProtInfo = extras.getByteArray(EXTRA_PROTINFO);

Methods Summary
public static android.nfc.tech.NfcB	get(android.nfc.Tag tag) Get an instance of {@link NfcB} for the given tag. Returns null if {@link NfcB} was not enumerated in {@link Tag#getTechList}. This indicates the tag does not support NFC-B. Does not cause any RF activity and does not block. param tag an NFC-B compatible tag return NFC-B object if (!tag.hasTech(TagTechnology.NFC_B)) return null; try { return new NfcB(tag); } catch (RemoteException e) { return null; }
public byte[]	getApplicationData() Return the Application Data bytes from ATQB/SENSB_RES at tag discovery. Does not cause any RF activity and does not block. return Application Data bytes from ATQB/SENSB_RES bytes return mAppData;
public int	getMaxTransceiveLength() Return the maximum number of bytes that can be sent with {@link #transceive}. return the maximum number of bytes that can be sent with {@link #transceive}. return getMaxTransceiveLengthInternal();
public byte[]	getProtocolInfo() Return the Protocol Info bytes from ATQB/SENSB_RES at tag discovery. Does not cause any RF activity and does not block. return Protocol Info bytes from ATQB/SENSB_RES bytes return mProtInfo;
public byte[]	transceive(byte[] data) Send raw NFC-B commands to the tag and receive the response. Applications must not append the EoD (CRC) to the payload, it will be automatically calculated. Applications must not send commands that manage the polling loop and initialization (SENSB_REQ, SLOT_MARKER etc). Use {@link #getMaxTransceiveLength} to retrieve the maximum number of bytes that can be sent with {@link #transceive}. This is an I/O operation and will block until complete. It must not be called from the main application thread. A blocked call will be canceled with {@link IOException} if {@link #close} is called from another thread. Requires the {@link android.Manifest.permission#NFC} permission. param data bytes to send return bytes received in response throws TagLostException if the tag leaves the field throws IOException if there is an I/O failure, or this operation is canceled return transceive(data, true);