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Como criar uma URL usando NFC

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Article Metadata

Exemplo de código
Código fonte:

Originado de NFC URLWriter
Por valderind4
Última alteração feita por lpvalente em 25 Jan 2014

Este artigo mostra um MIDlet básico que escreve uma URL em uma tag/Transponder externo. (Mostrado no NFC Forum Developer Training, WIMA 2008 e NFC-Congress Hagenberg 2008).

Baixe o apropriado NetBeans projetoDownload:

package at.nfcresearch.wima.examples;
// Packages for contactless Communcation
import javax.microedition.contactless.ContactlessException;
import javax.microedition.contactless.DiscoveryManager;
import javax.microedition.contactless.TargetProperties;
import javax.microedition.contactless.TargetListener;
import javax.microedition.contactless.TargetType;
// Packages for NDEF
import javax.microedition.contactless.ndef.NDEFRecord;
import javax.microedition.contactless.ndef.NDEFMessage;
import javax.microedition.contactless.ndef.NDEFRecordType;
import javax.microedition.contactless.ndef.NDEFTagConnection;
// Packages for GUI Stuff
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;
import javax.microedition.midlet.*;
public class URLWriter extends MIDlet implements TargetListener, CommandListener {
// Display Stuff
private Command exitCommand;
private Form form;
public URLWriter() {
exitCommand = new Command("Exit", Command.EXIT, 1);
form = new Form(" URL Writer");
form.append("Touch Tag to write URL");
// Registration of the TargetListener for external contactless
// Targets (in this RFID_TAG).
try {
DiscoveryManager dm = DiscoveryManager.getInstance();
dm.addTargetListener(this, TargetType.NDEF_TAG);
} catch (ContactlessException ce) {
displayAlert("Unable to register TargetListener: " + ce.toString(), AlertType.ERROR);
public void startApp() {
public void pauseApp() {
public void destroyApp(boolean unconditional) {
* Implementation of the Call-Back Function of the TargetListener
* @param targetProperties: Array of Targets found by the Phone

public void targetDetected(TargetProperties[] targetProperties) {
// in case no targets found, exit the method
if (targetProperties.length == 0) {
// NDEF Connection for write Operation
NDEFTagConnection ndconn = getNDEFTAGConnection(targetProperties);
try {
// Open NDEF Connection to the first Tag found
// ndconn = (NDEFTagConnection)[0].getUrl());
// Headerbyte: open Bookmark in Browser
byte[] headerByte = {0x00};
// Payload Text: URL as a byte-Array
byte[] urlBytes = "".getBytes();
// Create NDEF Record
NDEFRecord r = new NDEFRecord(new NDEFRecordType(NDEFRecordType.NFC_FORUM_RTD, "urn:nfc:wkt:U"), null, null);
// Append Payload Manually
// Create Recoard Array and Add Record
NDEFRecord[] myRecArray = new NDEFRecord[]{r};
// Generate a Message out of the Array
NDEFMessage myMessage = new NDEFMessage(myRecArray);
// Write Message to Tag
displayAlert("Information written", AlertType.INFO);
} catch (IOException io) {
displayAlert("IOException during open() or Write(): " + io.toString(), AlertType.ERROR);
} catch (ContactlessException io) {
displayAlert("ContactlessException during writeNDEF(): " + io.toString(), AlertType.ERROR);
} catch (Exception e) {
displayAlert("Exception: " + e.toString(), AlertType.ERROR);
} // in case of an exception, close connection properly
finally {
// close Connection again
if (ndconn != null) {
try {
} catch (IOException ex) {
displayAlert("IOException during close(): " + ex.toString(), AlertType.ERROR);
private NDEFTagConnection getNDEFTAGConnection(TargetProperties[] tProp) {
for (int j = 0; j < tProp.length; j++) {
Class[] connections = tProp[j].getConnectionNames();
if (connections != null) {
for (int i = 0; i < connections.length; i++) {
if (connections[i].getName().equals(
"javax.microedition.contactless.ndef.NDEFTagConnection")) {
try {
return (NDEFTagConnection)[0].getUrl(connections[i]));
} catch (Exception e) {
displayAlert("Error writting NDEF: " + e.toString(), AlertType.ERROR);
return null;
* Implementation of the Call-Back function of the CommandListener
* @param command: command key pressed
* @param displayable: associated displayable Object

public void commandAction(Command command, Displayable displayable) {
if (command == exitCommand) {
DiscoveryManager dm = DiscoveryManager.getInstance();
dm.removeTargetListener(this, TargetType.NDEF_TAG);
private void displayAlert(String error, AlertType type) {
Alert err = new Alert(form.getTitle(), error, null, type);
Display.getDisplay(this).setCurrent(err, form);
This page was last modified on 25 January 2014, at 18:14.
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