Categories: Code Examples | Java | NFC

This page was last modified 09:00, 3 January 2008.

From Forum Nokia Wiki

import java.io.IOException;
 
import javax.microedition.io.Connector;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
 
import com.nokia.nfc.nxp.mfstd.MFStandardConnection;
 
 
public class GetMyUID extends MIDlet {
	Form form = new Form("GetMyUID");
 
	public GetMyUID() {
	}
 
	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
	}
 
	protected void pauseApp() {
	}
 
	protected void startApp() throws MIDletStateChangeException {
		Display.getDisplay(this).setCurrent(form);
		
		MFStandardConnection myTag = null;
		try {
			myTag = (MFStandardConnection) Connector.open(System.getProperty("internal.mf.url"));
			form.append("My UID: " + decodeUID(myTag.getManufacturerBlock().getUID()));
		} catch (Exception e) {
			form.append(e.toString());
		} finally {
			if (myTag != null) {
				try {
					myTag.close();
				} catch (IOException e) {
					form.append(e.toString());
				}
			}
		}
	}
	
	private String decodeUID(byte[] uid) {
		byte[] result = new byte[uid.length*2];
		for (int i = 0; i < uid.length; i++) {
			result[i*2] = (hexChars[(uid[i] & 0xF0) >>> 4]);
			result[i*2+1] = (hexChars[uid[i] & 0x0F]);
		}
		
		return new String(result);
	}
	
	private final static byte[] hexChars = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
}