Example usage for android.nfc.tech NfcA getAtqa

Introduction

In this page you can find the example usage for android.nfc.tech NfcA getAtqa.

Prototype

public byte[] getAtqa() 

Source Link

Document

Return the ATQA/SENS_RES bytes from tag discovery.

Usage

From source file:de.syss.MifareClassicTool.Common.java

/**
 * Check if the tag and the device support the Mifare Classic technology.
 * @param tag The tag to check./* www  .j  a  v a  2 s  .  c  om*/
 * @param context The context of the package manager.
 * @return
 * <ul>
 * <li>0 - Device and tag support Mifare Classic.</li>
 * <li>-1 - Device does not support Mifare Classic.</li>
 * <li>-2 - Tag does not support Mifare Classic.</li>
 * <li>-3 - Error (tag or context is null).</li>
 * </ul>
 */
public static int checkMifareClassicSupport(Tag tag, Context context) {
    if (tag == null || context == null) {
        // Error.
        return -3;
    }

    if (Arrays.asList(tag.getTechList()).contains(MifareClassic.class.getName())) {
        // Device and tag support Mifare Classic.
        return 0;

        // This is no longer valid. There are some devices (e.g. LG's F60)
        // that have this system feature but no Mifare Classic support.
        // (The F60 has a Broadcom NFC controller.)
        /*
        } else if (context.getPackageManager().hasSystemFeature(
        "com.nxp.mifare")){
            // Tag does not support Mifare Classic.
            return -2;
        */

    } else {
        // Check if device does not support Mifare Classic.
        // For doing so, check if the ATQA + SAK of the tag indicate that
        // it's a Mifare Classic tag.
        // See: http://www.nxp.com/documents/application_note/AN10833.pdf
        // (Table 5 and 6)
        // 0x28 is for some emulated tags.
        NfcA nfca = NfcA.get(tag);
        byte[] atqa = nfca.getAtqa();
        if (atqa[1] == 0
                && (atqa[0] == 4 || atqa[0] == (byte) 0x44 || atqa[0] == 2 || atqa[0] == (byte) 0x42)) {
            // ATQA says it is most likely a Mifare Classic tag.
            byte sak = (byte) nfca.getSak();
            if (sak == 8 || sak == 9 || sak == (byte) 0x18 || sak == (byte) 0x88 || sak == (byte) 0x28) {
                // SAK says it is most likely a Mifare Classic tag.
                // --> Device does not support Mifare Classic.
                return -1;
            }
        }
        // Nope, it's not the device (most likely).
        // The tag does not support Mifare Classic.
        return -2;
    }
}

---

From source file:net.zjy.zxcardumper.Common.java

/**
 * Check if the tag and the device support the MIFARE Classic technology.
 * @param tag The tag to check./* ww w. j  av a2  s  .com*/
 * @param context The context of the package manager.
 * @return
 * <ul>
 * <li>0 - Device and tag support MIFARE Classic.</li>
 * <li>-1 - Device does not support MIFARE Classic.</li>
 * <li>-2 - Tag does not support MIFARE Classic.</li>
 * <li>-3 - Error (tag or context is null).</li>
 * </ul>
 */
public static int checkMifareClassicSupport(Tag tag, Context context) {
    if (tag == null || context == null) {
        // Error.
        return -3;
    }

    if (Arrays.asList(tag.getTechList()).contains(MifareClassic.class.getName())) {
        // Device and tag support MIFARE Classic.
        return 0;

        // This is no longer valid. There are some devices (e.g. LG's F60)
        // that have this system feature but no MIFARE Classic support.
        // (The F60 has a Broadcom NFC controller.)
        /*
        } else if (context.getPackageManager().hasSystemFeature(
        "com.nxp.mifare")){
            // Tag does not support MIFARE Classic.
            return -2;
        */

    } else {
        // Check if device does not support MIFARE Classic.
        // For doing so, check if the ATQA + SAK of the tag indicate that
        // it's a MIFARE Classic tag.
        // See: http://www.nxp.com/documents/application_note/AN10833.pdf
        // (Table 5 and 6)
        // 0x28 is for some emulated tags.
        NfcA nfca = NfcA.get(tag);
        byte[] atqa = nfca.getAtqa();
        if (atqa[1] == 0
                && (atqa[0] == 4 || atqa[0] == (byte) 0x44 || atqa[0] == 2 || atqa[0] == (byte) 0x42)) {
            // ATQA says it is most likely a MIFARE Classic tag.
            byte sak = (byte) nfca.getSak();
            if (sak == 8 || sak == 9 || sak == (byte) 0x18 || sak == (byte) 0x88 || sak == (byte) 0x28) {
                // SAK says it is most likely a MIFARE Classic tag.
                // --> Device does not support MIFARE Classic.
                return -1;
            }
        }
        // Nope, it's not the device (most likely).
        // The tag does not support MIFARE Classic.
        return -2;
    }
}

---