Mobile Programming Pit Stop

3 Responses to “JavaME JSR-179 Example Code : Detect Location via TinyGeocoder”

1. NotoriousNew-B Says:
   
   August 2nd, 2009 at 3:16 am
   

   Hi there.

   Is it possible to also display the location with maps (Google Maps, etc) on a J2ME application? If so, how?

   
   
   
   
2. santhosh Says:
   
   September 1st, 2009 at 5:49 pm
   

   Hai,

   I tried this code in Nokia E 71 mobile, it’s working fine for showing the coordinates, but it could not represent the location info.

   Could you please provide informatiom.

   Thanks,
   Regards,
   Santhosh.

   
   
   
   
3. harryteguh Says:
   
   December 2nd, 2009 at 4:13 pm
   

   Hi, there.

   I tried some of the method from your project in my own Midlet. But I encountered a problem. The “Location” StringItem won’t return me the coordinate’s place name. Instead it gives me an error that reads “602: Address cannot be found”. Please help….

   here’s the full code:

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

   import java.util.*;
   import javax.microedition.midlet.*;
   import javax.microedition.lcdui.*;
   import javax.microedition.location.*;
   import java.io.*;
   import javax.microedition.io.*;

   /**
   * @author Onime no Nero
   */
   public class LocationMidletPhase1 extends MIDlet implements CommandListener{
   private Command exit=new Command(”Exit”, Command.EXIT,1);
   private Command location=new Command(”Location”, Command.ITEM,1);
   private Command minimize=new Command(”Minimize”, Command.ITEM,1);
   private String sUrl;
   private StringItem locationName = new StringItem(”Location”, “”);
   private Display display;
   private Form mainForm=new Form(”NeroNull: Location Midlet”);
   private StringItem lat=new StringItem(”Latitude: “, “”, Item.PLAIN);
   private StringItem lon=new StringItem(”Longitude: “,”",Item.PLAIN);
   private StringItem alt=new StringItem(”Altitude: “,”",Item.PLAIN);
   private StringItem speed=new StringItem(”Speed: “,”",Item.PLAIN);
   private StringItem stat=new StringItem(”Status: “,”",Item.PLAIN);
   private StringItem version=new StringItem(”Version: “,”Unknown”, Item.PLAIN);
   private LocationProvider provider;
   private Timer timer;
   private ScheduledTransmission task;
   private long startTime;
   public LocationMidletPhase1(){
   mainForm.addCommand(exit);
   mainForm.addCommand(location);
   mainForm.setCommandListener(this);
   version.setText(System.getProperty(”microedition.location.version”));
   startTime=System.currentTimeMillis();
   mainForm.append(version);
   mainForm.append(lat);
   mainForm.append(lon);
   mainForm.append(alt);
   mainForm.append(speed);
   mainForm.append(stat);
   mainForm.append(locationName);
   }

   public void startApp() {
   display=Display.getDisplay(this);

   display.setCurrent(mainForm);

   }

   public void pauseApp() {
   }

   public void destroyApp(boolean unconditional) {
   }
   public void commandAction(Command c, Displayable d){
   if(c==location){
   new Thread();
   timer = new Timer();
   task = new ScheduledTransmission();
   timer.schedule(task,10,10000);
   }
   if(c==exit){
   destroyApp(true);
   notifyDestroyed();
   return;
   }
   if(c==minimize){
   display.setCurrent(null);

   }
   }

   private class ScheduledTransmission extends TimerTask{
   public final void run(){
   try{
   Criteria cr=new Criteria();
   cr.setHorizontalAccuracy(0);
   cr.setVerticalAccuracy(0);

   provider=LocationProvider.getInstance(cr);
   long time=System.currentTimeMillis();
   Location loc=provider.getLocation(30);
   Coordinates coord=loc.getQualifiedCoordinates();
   if(coord!=null){
   if(loc.isValid()){
   try {
   testGET(sUrl);
   } catch (IOException e) {
   System.out.println(”IOException ” + e);
   e.printStackTrace();
   }
   lat.setText(Double.toString(coord.getLatitude()));
   lon.setText(Double.toString(coord.getLongitude()));
   alt.setText(Float.toString(coord.getAltitude()));
   speed.setText(Float.toString(loc.getSpeed()));
   stat.setText(”Valid Location Information”);
   mainForm.append(locationName);

   }
   else{
   stat.setText(”Invalid Location Information”);
   }
   }
   }
   catch(LocationException e){
   stat.setText(”Exception: “+e.getMessage());

   }
   catch(InterruptedException e){
   stat.setText(”Timeout: “+e.getMessage());
   }

   }
   }
   void testGET(String sUrl) throws IOException {
   sUrl =”http://tinygeocoder.com/create-api.php?g=”+lat+”,”+lon;
   HttpConnection connection = null;
   InputStream is = null;
   String sb = null;

   try {
   connection = (HttpConnection)Connector.open(sUrl);
   connection.setRequestMethod(HttpConnection.GET);
   is = connection.openInputStream();
   byte buf[] = new byte[128];
   int total =0;
   while (total <128) {
   int count = is.read(buf,total,128-total);
   if (count<0) {
   break;
   }
   total += count;
   }
   sb=new String(buf,0,total);
   if (sb.length() =0×30 && b=0×41 && b=0×61 && b<=0×7A)) {
   tmp.append((char)b);
   }
   else {
   tmp.append("%");
   if (b <= 0xf) tmp.append("0");
   tmp.append(Integer.toHexString(b));
   }
   }
   }
   catch (Exception e) {}
   return tmp.toString();
   }
   return null;
   }
   }

   
   
   
   

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