Writes an NDEF message to an NFC tag. - Android Network

Android examples for Network:NFC Message

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Description

Writes an NDEF message to an NFC tag.

Demo Code


import android.nfc.FormatException;
import android.nfc.NdefMessage;
import android.nfc.Tag;
import android.nfc.tech.Ndef;
import android.nfc.tech.NdefFormatable;
import android.util.Log;
import java.io.IOException;

public class Main{
    public static final String TAG = NfcUtils.class.getSimpleName();
    /**/* ww w  . ja v a  2  s .  co m*/
     * Writes an NDEF message to an NFC tag. If the tag is not already
     * formatted with NDEF, this will attempt to format the tag with the
     * provided NDEF message.
     *
     * @param message   The NDEF message to write to the tag.
     * @param tag   The tag
     * @return  {@code true} if writing was successful, {@code false} otherwise
     *
     * @throws IOException
     * @throws FormatException
     * @throws TagNotWritableException
     * @throws NdefMessageTooLongException
     */
    public static boolean writeNdefTag(NdefMessage message, Tag tag)
            throws IOException, FormatException, TagNotWritableException,
            NdefMessageTooLongException {
        int size = message.toByteArray().length;

        Ndef ndef = Ndef.get(tag);
        if (ndef != null) {
            ndef.connect();

            if (!ndef.isWritable()) {
                throw new TagNotWritableException();
            }
            if (ndef.getMaxSize() < size) {
                throw new NdefMessageTooLongException();
            }

            ndef.writeNdefMessage(message);

            Log.i(TAG, "Successfully wrote to NDEF tag");
            return true;
        } else {
            NdefFormatable format = NdefFormatable.get(tag);
            if (format != null) {
                format.connect();
                format.format(message);

                Log.i(TAG, "Successfully formatted and wrote to NDEF tag");
                return true;
            }
        }

        return false;
    }
}

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