GPS vs. MAP applications?

[Shashank Agarwalg]

Which type of applications are easy to implement and covers large range of applications.

I know advantages and drawbacks of both.
Their is many map applications today like blackberrymap, googlemap etc.

[Tim Holloway]

The two are more complementary than they are opposite. It's quite common to use GPS to obtain a position that can then be used on a map.

[minh hai]

I use following code to get the Latitude and Longitude:

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */


import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.location.*;
public class loctest extends MIDlet implements CommandListener
{
    private Display display;
    private Form form;
    private Command cmdExit,cmdOK;
    private StringItem si;
    public loctest()
    {
        String[] userliste = new String[4];
        userliste[0] = "hallo";
        System.out.println(userliste[0]);
        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)

    {
    /**
    * Constructor
    * EFFECTS: Initialise the server and store midlet information
    * @param midlet The main application midlet
    * @param server Forecast Server URL
    */
    this.midlet = midlet;


    }
    public void run()

    {
        /**
        * Entry point of the thread
        * EFFECTS: call to connect() method
        */

        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 500 meters horizontally
        Criteria cr= new Criteria();
        cr.setHorizontalAccuracy(500);
        // Get an instance of the provider
        lp= LocationProvider.getInstance(cr);
        // Request the location, setting a one-minute timeout
        l = lp.getLocation(60);
        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);
    }

}

I use WTK2.5.2 run it. .I am getting alert exception: java.lang.classnotfoundexception: location.
please help me run this code . Thanks alot

[Ulf Dittmer]

JSR-179 (which is where the javax.microedition.location package is defined) is not part of the CDC or CLDC; you'll need to add it manually to whatever environment you intend to use if it's not pre-installed (as it apparently isn't in your environment).

[minh hai]

Ulf Dittmer wrote:JSR-179 (which is where the javax.microedition.location package is defined) is not part of the CDC or CLDC; you'll need to add it manually to whatever environment you intend to use if it's not pre-installed (as it apparently isn't in your environment).

I'm a newbie so you can instruct specific than for me? Thanks your help

[Ulf Dittmer]

You can find the Specification, javadocs and reference implementation somewhere around here. That should allow you to compile the code.

How to use it in the emulator or in an actual device, I have no idea.