Revision as of 17:42, 21 August 2009 by bogdan.galiceanu (Talk | contribs)

Finding position in Java ME

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Article Metadata
Platform(s): S60 3rd Edition, FP2
Keywords: javax.microedition.location.LocationProvider,javax.microedition.location.Location,javax.microedition.location.Coordinates.getLatitude,javax.microedition.location.Coordinates.getLongitude()
Created: (29 Oct 2008)
Last edited: bogdan.galiceanu (21 Aug 2009)


This code snippet demonstrates how to retrieve device coordinates. It uses LocationProvider.getInstance() to obtain LocationProvider instance, which represents a location-providing module, generating Locations, and LocationProvider.getLocation() method to retrieve current latitude and longitude.

Source file: FindingPosition.java

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;
import javax.microedition.location.Coordinates;
import javax.microedition.location.Criteria;
import javax.microedition.location.Location;
import javax.microedition.location.LocationException;
import javax.microedition.location.LocationProvider;
import javax.microedition.midlet.MIDlet;
public class FindingPosition extends MIDlet implements CommandListener {
private Display display;
private Form form;
private Command exitCommand;
private Command refreshCommand;
private StringItem text;
private Location location;
private LocationProvider locationProvider;
private Coordinates coordinates;
private Criteria criteria;
* Constructor. Constructs the object and initializes displayables.

public FindingPosition() {
form = new Form("Finding location.");
exitCommand = new Command("Exit", Command.EXIT, 2);
refreshCommand = new Command("Refresh", Command.OK, 1);
text = new StringItem("Your position:", "\nPress \"Refresh\"");
display = Display.getDisplay(this);
criteria = new Criteria();
try {
locationProvider = LocationProvider.getInstance(criteria);
} catch (LocationException e) {
//TODO: Handle location exception.
* From MIDlet.
* Called when the MIDlet is started.

public void startApp() {
// No implementation required.
* From MIDlet.
* Called to signal the MIDlet to enter the Paused state.

public void pauseApp() {
// No implementation required.
* From MIDlet.
* Called to signal the MIDlet to terminate.
* @param unconditional whether the MIDlet has to be unconditionally
* terminated

public void destroyApp(boolean unconditional) {
// No implementation required
* From CommandListener.
* Called by the system to indicate that a command has been invoked on a
* particular displayable.
* @param cmd the command that was invoked
* @param displayable the displayable where the command was invoked

public void commandAction(Command c, Displayable d) {
if (c == refreshCommand) {
} else if (c == exitCommand) {
* Called to read current location.

private void checkLocation() {
String string;
try {
location = locationProvider.getLocation(60);
} catch (Exception e) {
//TODO: Handle exception.
coordinates = location.getQualifiedCoordinates();
if (coordinates != null) {
// Use coordinate information
double lat = coordinates.getLatitude();
double lon = coordinates.getLongitude();
string = "\nLatitude : " + lat + "\nLongitude : " + lon;
} else {
string = "Location API failed";


After user press "refresh", MIDlet will show current coordinates.

Supplementary material

You can see source file and executable application in attached zip archive. Archive is available for download at Finding_position_in_Java_ME.zip

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