trying to use external ACS NFC reader on windows using Android library and NFC tools

[Gurpreet Singh]

HI

as I tried to read and write Mifare ultralight using NFC tools -core It started giving me as unknown card error although it coiuld read all known tags and throw an error after them. I tried using Android library but I dont know what parameter to pass in Tag field

import android.nfc.Tag;

import android.nfc.tech.MifareUltralight;

import android.util.Log;

import java.io.IOException;

import java.nio.charset.Charset;

import java.util.ArrayList;

/**

 *

 */

public class MifareUltralightTagTester {

    private static int blockOffset = 4;

    private static int blockNumber = 16;

    private static int blockSize = 4;

    private static final String TAG = MifareUltralightTagTester.class.getSimpleName();

    /**

     * Write text to NFC Tag! Text size should be less than size of NFC tag memory! 46 bytes

     * @param tag

     * @param tagText

     * @return

     */

    public static boolean writeTag(Tag tag, String tagText) {

        boolean result = true;

        MifareUltralight ultralight = MifareUltralight.get(tag);

        if (tagText.length() < (blockNumber-blockOffset)*blockSize) {

            ArrayList<String> list = new ArrayList<String>();

            int start = 0;

            int end = blockSize;

            while (end < tagText.length()) {

                String text = tagText.substring(start, end);

                Log.d(TAG," - [" + text + "]" );

                list.add(text); 

                start +=blockSize;

                end += blockSize;

            }

            try {

                ultralight.connect();

                int page = blockOffset;

                for (String text:list) {

                    Log.d(TAG,"page=" + page + " [" + text + "]" );

                    ultralight.writePage(page, text.getBytes(Charset.forName("US-ASCII")));

                    page++;

                }

            } catch (IOException e) {

                Log.e(TAG, "IOException while closing MifareUltralight...", e);

                result = false;

            } finally {

                try {

                    ultralight.close();

                } catch (IOException e) {

                    Log.e(TAG, "IOException while closing MifareUltralight...", e);

                    result = false;

                }

            }

        } else {

            Log.e(TAG, "Text size bigger than MilfareUltralight size (46 byte)");

            result = false;

        }

        return result;

    }

    public static String readTag(Tag tag) {

        MifareUltralight mifare = MifareUltralight.get(tag);

        try {

            mifare.connect();

            byte[] payload1 = mifare.readPages(4);

            String part1 = new String(payload1, Charset.forName("US-ASCII"));

            byte[] payload2 = mifare.readPages(8);

            String part2 = new String(payload2, Charset.forName("US-ASCII"));

            return part1 + part2;

        } catch (IOException e) {

            Log.e(TAG, "IOException while writing MifareUltralight message...", e);

        } finally {

            if (mifare != null) {

                try {

                    mifare.close();

                }

                catch (IOException e) {

                    Log.e(TAG, "Error closing tag...", e);

                }

            }

        }

        return null;

    }

}

the NFCtagAdaptor which I use does not give me an option to getTag and also I dont know the tag listner