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NFC PushRegistryWriter

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Article Metadata
Code Example
Source file: Media:NDEFPush.zip
Compatibility
Platform(s):
Series 40
Article
Created: geri-m (01 May 2008)
Last edited: hamishwillee (23 Jul 2013)

Warning.pngWarning: This example was created for the NFC implementation provided on Series 40 devices, and may include use of features not yet available for NFC on Symbian devices.

The code shows a basic MIDlet that writes an NDEF (EXTERNAL_RTD) to a tag, in order to start an application. The application to be started requires the following line in the JAD-File:

MIDlet-Push-1: ndef:external_rtd?name=urn:nfc:ext:nfc-research.at:pushreg,at.nfcresearch.wima.examples.PushReg,*

This example does NOT work in the Emulator of the Nokia 6131, but only on the phone! You can download ZIP with two NetBeans Project to try out the functionality: File:NDEFPush.zip.

package at.nfcresearch.wima.examples;
 
import javax.microedition.contactless.ContactlessException;
import javax.microedition.contactless.DiscoveryManager;
import javax.microedition.contactless.TargetListener;
import javax.microedition.contactless.TargetProperties;
import javax.microedition.contactless.TargetType;
import javax.microedition.contactless.ndef.NDEFMessage;
import javax.microedition.contactless.ndef.NDEFRecord;
import javax.microedition.contactless.ndef.NDEFRecordType;
import javax.microedition.contactless.ndef.NDEFTagConnection;
import javax.microedition.io.Connector;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
 
public class PushRegTagWriter extends MIDlet implements TargetListener, CommandListener {
 
// Display Items
private Command exitCommand;
private StringItem text;
private Form form;
 
public PushRegTagWriter() {
 
// Display Items
exitCommand = new Command("Exit", Command.EXIT, 1);
form = new Form("NFC-Research.at: PushRegistry Tag Writer");
 
form.addCommand(exitCommand);
form.append("Touch Tag to write Ext-NDEF for PushRegistry start.");
form.setCommandListener(this);
 
 
// Registration of the Targetlistener
// Look for ANY Type of RFID Tag that can be
// read by the phone.
try {
DiscoveryManager dm = DiscoveryManager.getInstance();
dm.addTargetListener(this, TargetType.RFID_TAG);
} catch (ContactlessException ce) {
displayAlert("Unable to Register Targetlistener:" + ce.toString(), AlertType.ERROR);
Display.getDisplay(this).setCurrent(form);
}
}
 
protected void startApp() {
Display.getDisplay(this).setCurrent(form);
}
 
protected void pauseApp() {
}
 
protected void destroyApp(boolean bool) {
 
}
 
public void commandAction(Command cmd, Displayable disp) {
if (cmd == exitCommand) {
DiscoveryManager dm = DiscoveryManager.getInstance();
dm.removeTargetListener(this, TargetType.RFID_TAG);
destroyApp(false);
notifyDestroyed();
}
 
 
}
 
/**
* Method called by the TargetListener in case a tag
* was detected.
* @param prop contains the array of tags found.
*/

public void targetDetected(TargetProperties[] prop) {
 
// if there is no information available on the tags
// found, exit Method.
if (prop.length == 0) {
return;
}
 
// Create a new NDEF Connection in order
// to write an NDEF EXT to the tag.
NDEFTagConnection ndconn = null;
try {
// create an ndef tag connection.
String ur = prop[0].getUrl(Class.forName("javax.microedition.contactless.ndef.NDEFTagConnection"));
 
// open the NDEF Connection
ndconn = (NDEFTagConnection) Connector.open(ur);
 
// now create the NDEFRecord
NDEFRecordType myType = new NDEFRecordType(NDEFRecordType.EXTERNAL_RTD, "urn:nfc:ext:nfc-research.at:pushreg");
NDEFRecord myRec;
 
// create Data-Container for Tag
myRec = new NDEFRecord(myType, null, null);
 
NDEFRecord[] myRecArray = new NDEFRecord[]{myRec};
NDEFMessage myMessage = new NDEFMessage(myRecArray);
 
// write Information to Tag
ndconn.writeNDEF(myMessage);
 
displayAlert("Writing succeeded!", AlertType.INFO);
} catch (Exception e) {
displayAlert("Error Writing to Tag! " + e.toString(), AlertType.ERROR);
}
try {
ndconn.close();
} catch (Exception e) {
}
}
 
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 23 July 2013, at 10:18.
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