Added in API level 17

Summary: Constants | Methods | Inherited Methods

NfcBarcode

Kotlin |Java

public final class NfcBarcode
extends Object implements TagTechnology

java.lang.Object
↳	android.nfc.tech.NfcBarcode

Provides access to tags containing just a barcode.

Acquire an NfcBarcode object using get(Tag).

Summary

Constants
`int`	`TYPE_KOVIO` Kovio Tags
`int`	`TYPE_UNKNOWN`

Public methods
`void`	`close()` Disable I/O operations to the tag from this `TagTechnology` object, and release resources.
`void`	`connect()` Enable I/O operations to the tag from this `TagTechnology` object.
`static NfcBarcode`	`get(Tag tag)` Get an instance of `NfcBarcode` for the given tag.
`byte[]`	`getBarcode()` Returns the barcode of an NfcBarcode tag.
`Tag`	`getTag()` Get the `Tag` object backing this `TagTechnology` object.
`int`	`getType()` Returns the NFC Barcode tag type.
`boolean`	`isConnected()` Helper to indicate if I/O operations should be possible.

Inherited methods

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

From interface


        
          android.nfc.tech.TagTechnology

`abstract void`	`close()` Disable I/O operations to the tag from this `TagTechnology` object, and release resources.
`abstract void`	`connect()` Enable I/O operations to the tag from this `TagTechnology` object.
`abstract Tag`	`getTag()` Get the `Tag` object backing this `TagTechnology` object.
`abstract boolean`	`isConnected()` Helper to indicate if I/O operations should be possible.

From interface


        
          java.io.Closeable


      close()

Closes this stream and releases any system resources associated with it.

From interface


        
          java.lang.AutoCloseable


      close()

Closes this resource, relinquishing any underlying resources.

Constants

TYPE_KOVIO

Added in API level 17

public static final int TYPE_KOVIO

Kovio Tags

Constant Value: 1 (0x00000001)

TYPE_UNKNOWN

Added in API level 17

public static final int TYPE_UNKNOWN

Constant Value: -1 (0xffffffff)

Public methods

close

Added in API level 17

public void close ()

Disable I/O operations to the tag from this TagTechnology object, and release resources.

Also causes all blocked I/O operations on other thread to be canceled and return with IOException.

Requires the Manifest.permission.NFC permission.

Throws
`IOException`

connect

Added in API level 17

public void connect ()

Enable I/O operations to the tag from this TagTechnology object.

May cause RF activity and may block. Must not be called from the main application thread. A blocked call will be canceled with IOException by calling close() from another thread.

Only one TagTechnology object can be connected to a Tag at a time.

Applications must call close() when I/O operations are complete.

Requires the Manifest.permission.NFC permission.

Throws
`IOException`

get

Added in API level 17

public static NfcBarcode get (Tag tag)

Get an instance of NfcBarcode for the given tag.

Returns null if NfcBarcode was not enumerated in Tag#getTechList.

Does not cause any RF activity and does not block.

Parameters
`tag`	`Tag`: an NfcBarcode compatible tag

Returns
`NfcBarcode`	NfcBarcode object

getBarcode

Added in API level 17

public byte[] getBarcode ()

Returns the barcode of an NfcBarcode tag.

Tags of TYPE_KOVIO return 16 bytes:

The first byte is 0x80 ORd with a manufacturer ID, corresponding to ISO/IEC 7816-6.

The second byte describes the payload data format. Defined data format types include the following:

0x00: Reserved for manufacturer assignment
0x01: 96-bit URL with "http://www." prefix
0x02: 96-bit URL with "https://www." prefix
0x03: 96-bit URL with "http://" prefix
0x04: 96-bit URL with "https://" prefix
0x05: 96-bit GS1 EPC
0x06-0xFF: reserved

The following 12 bytes are payload:

In case of a URL payload, the payload is encoded in US-ASCII, following the limitations defined in RFC3987.
In case of GS1 EPC data, see GS1 Electronic Product Code (EPC) Tag Data Standard (TDS) for more details.

The last 2 bytes comprise the CRC.

Does not cause any RF activity and does not block.

Returns
`byte[]`	a byte array containing the barcode

See also:

getTag

Added in API level 17

public Tag getTag ()

Get the Tag object backing this TagTechnology object.

Returns
`Tag`	the `Tag` backing this `TagTechnology` object.

getType

Added in API level 17

public int getType ()

Returns the NFC Barcode tag type.

Currently only one of TYPE_KOVIO or TYPE_UNKNOWN.

Does not cause any RF activity and does not block.

Returns
`int`	the NFC Barcode tag type

isConnected

Added in API level 17

public boolean isConnected ()

Helper to indicate if I/O operations should be possible.

Returns true if connect() has completed, and close() has not been called, and the Tag is not known to be out of range.

Does not cause RF activity, and does not block.

Returns
`boolean`	true if I/O operations should be possible