Added in API level 10

NfcB


class NfcB : TagTechnology
kotlin.Any
   ↳ android.nfc.tech.NfcB

Provides access to NFC-B (ISO 14443-3B) properties and I/O operations on a Tag.

Acquire a NfcB object using get.

The primary NFC-B I/O operation is transceive. Applications must implement their own protocol stack on top of transceive.

Note: Methods that perform I/O operations require the android.Manifest.permission#NFC permission.

Summary

Public methods
Unit

Unit

static NfcB!
get(tag: Tag!)

Get an instance of NfcB for the given tag.

ByteArray!

Return the Application Data bytes from ATQB/SENSB_RES at tag discovery.

Int

Return the maximum number of bytes that can be sent with transceive.

ByteArray!

Return the Protocol Info bytes from ATQB/SENSB_RES at tag discovery.

Tag!

Boolean

ByteArray!

Send raw NFC-B commands to the tag and receive the response.

Public methods

close

Added in API level 10
fun close(): Unit
Exceptions
java.lang.Exception if this resource cannot be closed
java.io.IOException if an I/O error occurs
java.lang.SecurityException if the tag object is reused after the tag has left the field

connect

Added in API level 10
fun connect(): Unit
Exceptions
TagLostException if the tag leaves the field
java.io.IOException if there is an I/O failure, or connect is canceled
java.lang.SecurityException if the tag object is reused after the tag has left the field

get

Added in API level 10
static fun get(tag: Tag!): NfcB!

Get an instance of NfcB for the given tag.

Returns null if NfcB was not enumerated in Tag#getTechList. This indicates the tag does not support NFC-B.

Does not cause any RF activity and does not block.

Parameters
tag Tag!: an NFC-B compatible tag
Return
NfcB! NFC-B object

getApplicationData

Added in API level 10
fun getApplicationData(): ByteArray!

Return the Application Data bytes from ATQB/SENSB_RES at tag discovery.

Does not cause any RF activity and does not block.

Return
ByteArray! Application Data bytes from ATQB/SENSB_RES bytes

getMaxTransceiveLength

Added in API level 14
fun getMaxTransceiveLength(): Int

Return the maximum number of bytes that can be sent with transceive.

Return
Int the maximum number of bytes that can be sent with transceive.

getProtocolInfo

Added in API level 10
fun getProtocolInfo(): ByteArray!

Return the Protocol Info bytes from ATQB/SENSB_RES at tag discovery.

Does not cause any RF activity and does not block.

Return
ByteArray! Protocol Info bytes from ATQB/SENSB_RES bytes

getTag

Added in API level 10
fun getTag(): Tag!
Return
Tag! the Tag backing this TagTechnology object.

isConnected

Added in API level 10
fun isConnected(): Boolean
Return
Boolean true if I/O operations should be possible

transceive

Added in API level 10
fun transceive(data: ByteArray!): ByteArray!

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 getMaxTransceiveLength to retrieve the maximum number of bytes that can be sent with 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 IOException if #close is called from another thread.

Requires the android.Manifest.permission#NFC permission.

Parameters
data ByteArray!: bytes to send
Return
ByteArray! bytes received in response
Exceptions
TagLostException if the tag leaves the field
java.io.IOException if there is an I/O failure, or this operation is canceled