public class IsoDep

ISO 14443-4 / ISO 7816-4 technology view: send APDU command-response pairs to a contactless smart card (EMV payment, ePassport, government ID, transit). Backed by IsoDep on Android and by NFCISO7816Tag on iOS.

A typical SELECT-then-READ exchange:

IsoDep iso = tag.getIsoDep();
if (iso == null) {
    // tag is not ISO-DEP capable
    return;
}
byte[] selectAid = new byte[] {
    0x00, (byte) 0xA4, 0x04, 0x00, 0x07,
    (byte) 0xA0, 0x00, 0x00, 0x00, 0x04, 0x10, 0x10
};
iso.transceive(selectAid).onResult((sw, err) -> {
    // last two bytes of sw are the ISO 7816 SW1/SW2 status word
});

All response bytes (including the terminating SW1/SW2 status word) are returned verbatim. Use [#isSuccess(byte[])] to test for the canonical 90 00 success word without slicing.

Constructors

public IsoDep()

Methods

`public byte[] getHistoricalBytes()`	Historical bytes returned during ISO-DEP activation (Android `IsoDep.getHistoricalBytes()`).
`public int getMaxTransceiveLength()`	Largest single transceive payload the underlying transport accepts.
`public boolean isExtendedLengthSupported()`	`true` when this view exchanges extended-length APDUs (Lc / Le up to 65535).
`public final` `TagType getType()`	The technology variant this view represents.
`public static boolean isSuccess(byte[] response)`	Returns `true` when the last two bytes of `response` are the ISO 7816 success status word (`90 00`).
`public` `AsyncResource<byte[]> transceive(byte[] apdu)`	Sends the given raw bytes to the tag and resolves with the response.

Inherited methods

From Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait, clone

Constructor details

IsoDep

public IsoDep()

Method details

getHistoricalBytes

public byte[] getHistoricalBytes()

Historical bytes returned during ISO-DEP activation (Android IsoDep.getHistoricalBytes()). Empty when the platform does not surface them.

getMaxTransceiveLength

public int getMaxTransceiveLength()

Largest single transceive payload the underlying transport accepts. Some Android implementations top out at 253 bytes for short APDU frames; Core NFC fragments at 256. Use as an upper bound when chunking large READ BINARY exchanges.

isExtendedLengthSupported

public boolean isExtendedLengthSupported()

true when this view exchanges extended-length APDUs (Lc / Le up to 65535). Most Android devices report true; iOS Core NFC reports false.

getType

public final TagType getType()

The technology variant this view represents.

isSuccess

public static boolean isSuccess(byte[] response)

Returns true when the last two bytes of response are the ISO 7816 success status word (90 00). Useful as a quick check after [#transceive(byte[])].

transceive

public AsyncResource<byte[]> transceive(byte[] apdu)

Sends the given raw bytes to the tag and resolves with the response. The base class reports NfcError.UNSUPPORTED_TAG – ports override per technology.