Interface NfcListener

public interface NfcListener

Callback for long-running tag-discovery sessions registered via Nfc.addTagListener(NfcListener). Unlike Nfc.readTag(NfcReadOptions) -- which resolves once and ends the session -- a listener stays armed and receives every tag the platform produces until Nfc.removeTagListener(NfcListener) is called.

Useful on Android (foreground dispatch / reader-mode) where the tag stream is naturally multi-tag. On iOS each tagDiscovered(Tag) callback corresponds to a full Core NFC session that is automatically re-armed.

Callbacks run on the EDT.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    sessionFailed(NfcException error)
    Called when the session ends because of an error.
    void
    tagDiscovered(Tag tag)
    Called when a tag enters the field.

  • Method Details

    • tagDiscovered

      void tagDiscovered(Tag tag)
      Called when a tag enters the field. The tag is alive only for the duration of this call plus any pending async transceives; after the next system event it may report NfcError.TAG_LOST.

    • sessionFailed

      void sessionFailed(NfcException error)
      Called when the session ends because of an error. After this fires the listener is automatically removed; re-register it to resume.