Example of Location Api in Midlet (source code)

To work out this example the mobile must have JSR 179 package. The mobile need to be gps enabled.The application will display your current coordinates in Latitude, Longitude.


import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.location.*;

public class LocationApiTest extends MIDlet implements CommandListener
{
private Display display;
private Form form;
private Command cmdExit,cmdOK;
private StringItem si;

public loctest()
{
display =Display.getDisplay(this);
form = new Form("Location Api test");
cmdExit = new Command("Exit",Command.EXIT,5);
cmdOK = new Command("OK",Command.OK,1);
si = new StringItem("Geo Location", "Click OK");
form.append(si);
form.addCommand(cmdOK);
form.addCommand(cmdExit);
form.setCommandListener(this);
}

public void startApp()
{
display.setCurrent(form);
}


public void pauseApp(){
}

public void destroyApp(boolean flag) {
notifyDestroyed();
}

public void commandAction(Command c, Displayable d){
if (c == cmdOK){
Retriever ret = new Retriever(this);
ret.start();
} else if (c == cmdExit) {
destroyApp(false);
}
}

public void displayString(String string){
si.setText(string);
}
}

class Retriever extends Thread {

private loctest midlet;

public Retriever(loctest midlet){
this.midlet = midlet;
}

public void run(){
try {
checkLocation();
} catch (Exception ex){
ex.printStackTrace();
midlet.displayString(ex.toString());
}
}

public void checkLocation() throws Exception{
String string;
Location l;
LocationProvider lp;
Coordinates c;
// Set criteria for selecting a location provider:
// accurate to 100 meters horizontally
Criteria cr= new Criteria();
cr.setHorizontalAccuracy(100);

// Get an instance of the provider
lp= LocationProvider.getInstance(cr);

// Request the location, setting a half-minute timeout
l = lp.getLocation(30);
c = l.getQualifiedCoordinates();

if(c != null ) {
// Use coordinate information
double lat = c.getLatitude();
double lon = c.getLongitude();
string = "\nLatitude : " + lat + "\nLongitude : " + lon;
} else {
string ="Location API failed";
}
midlet.displayString(string);
}
}