get NFC Ndef Well Known Text - Android Network

Android examples for Network:NFC Ndef

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Description

get NFC Ndef Well Known Text

Demo Code


//package com.java2s;
import java.nio.charset.Charset;
import java.util.Locale;
import java.util.Random;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;

public class Main {
    public static NdefMessage getNdefWellKnownText(String text) {
        NdefRecord textRecord = getTextRecord(text);
        return createNdefMessage(textRecord);
    }//  ww w.j  av  a  2 s.co m

    private static NdefRecord getTextRecord(String message) {
        NdefRecord record = new NdefRecord(NdefRecord.TNF_WELL_KNOWN,
                NdefRecord.RTD_TEXT, getRandomIdBytes(),
                getTextPayLoad(message));
        return record;
    }

    private static NdefMessage createNdefMessage(NdefRecord... records) {
        NdefMessage ndefMessage = new NdefMessage(records);
        return ndefMessage;
    }

    private static byte[] getRandomIdBytes() {
        Random rand = new Random(System.currentTimeMillis());
        byte buf[] = new byte[4];
        rand.nextBytes(buf);
        return buf;
    }

    /**
     * payload[0] contains the "Status Byte Encodings" field, per the NFC Forum
     * "Text Record Type Definition" section 3.2.1.
     * 
     * bit7 is the Text Encoding Field.
     * 
     * if (Bit_7 == 0): The text is encoded in UTF-8 if (Bit_7 == 1): The text
     * is encoded in UTF16
     * 
     * Bit_6 is reserved for future use and must be set to zero.
     * 
     * Bits 5 to 0 are the length of the IANA language code.
     */
    public static byte[] getTextPayLoad(String message) {

        Locale locale = Locale.US;
        final byte[] langBytes = locale.getLanguage().getBytes(
                Charset.forName("UTF-8"));

        final byte[] textBytes = message.getBytes(Charset.forName("UTF-8"));
        final int utfBit = 0;
        final char status = (char) (utfBit + langBytes.length);

        int totalLength = 1 + langBytes.length + textBytes.length;
        byte data[] = new byte[totalLength];

        copySmallArraysToBigArray(new byte[][] {
                new byte[] { (byte) status }, langBytes, textBytes }, data);

        return data;
    }

    public static void copySmallArraysToBigArray(
            final byte[][] smallArrays, final byte[] bigArray) {
        int currentOffset = 0;
        for (final byte[] currentArray : smallArrays) {
            System.arraycopy(currentArray, 0, bigArray, currentOffset,
                    currentArray.length);
            currentOffset += currentArray.length;
        }
    }
}

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