Java 类android.nfc.tech.MifareUltralight 实例源码

private byte[] readMifareUltralight(MifareUltralight tag) throws IOException {
    byte[] payload = new byte[MIFARE_ULTRALIGHT_SIZE_LIMIT];
    try {
        tag.connect();
        for (int i = 4; i < 16; i++) {
            System.arraycopy(
                    tag.readPages(i),
                    0,
                    payload,
                    (i - 4) * 4,
                    4
            );
        }
    } finally {
        tag.close();
    }

    return payload;
}

private byte[] readTag(Tag tag) throws IOException, FormatException, ReadingTagException {
    List<String> tech = Arrays.asList(tag.getTechList());
    if (tech.contains(Ndef.class.getName())) {
        Log.v(TAG, "Read formatted tag.");
        return readNdeftag(Ndef.get(tag));
    } else if (tech.contains(MifareUltralight.class.getName())) {
        Log.v(TAG, "Read Mifare ultralight tag.");
        return readMifareUltralight(MifareUltralight.get(tag));
    }
    Toast.makeText(this, "No supported tag found.", Toast.LENGTH_SHORT).show();
    Log.e(TAG, "No supported tag found: " + tech);
    throw new ReadingTagException("No supported tag found.");
}

private void clearTag(MifareUltralight tag) {
    byte[] payload = new byte[MIFARE_ULTRALIGHT_SIZE_LIMIT];
    Arrays.fill(payload, (byte) 0);
    write(tag, payload);
}