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Posts Tagged ‘j2me’

Porting JavaME apps to Android is easier with J2ME Polish

March 4th, 2009 1 Comment   Posted in Android, J2ME / JavaME, Mobile Software

Great news for JavaME developers! The J2ME Polish project has announced that their upcoming j2mepolish 2.1 toolkit suite will support porting JavaME apps to Google Android mobile platform automatically! This means that the current JavaME developers will enjoy the advantages of porting their existing mobile application to Android effortlessly.

Android Logo

According to their press release, the next j2mepolish release will focus on automating the process of converting JavaME MIDlets to iPhone application.

J2ME Polish 2.1: Android support?

Android Logo

Currently I’ve yet to see how a ported JavaME application would look like on an Android mobile phone, but hopefully it would be as good as the ordinary Google Android app. At this time of this writing, J2ME Polish 2.1 is only available as a preview release which can be downloaded from J2ME Polish website.

I’ll update this blog about this feature once J2ME Polish 2.1 has been released.

p/s: I’m Eager to know how a JavaME app will look like once its ported to Android.


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JavaME JSR-179 Example Code : Detect Location via TinyGeocoder

February 22nd, 2009 3 Comments   Posted in J2ME / JavaME, Location API, Open Source, Smartphone, Tips, Tricks, Guide

I've completed the JSR-179 Location API code for reverse geocoding in JavaME. This code essentially is an expansion of the previous JSR-179 example that i've posted in the blog before, plus the Reverse-Geocoding feature, thanks to TinyGeocoder service.

J2ME GPS Reverse Geocoding mypapit

What this sample MIDlet does?
It obtain coordinates via the mobile phone JSR-179 Location API and subsequently display the name of the location using TinyGeocoder reverse geocoding service.

PLAIN TEXT
JAVA:
  1. import javax.microedition.midlet.*;
  2. import javax.microedition.lcdui.*;
  3. import javax.microedition.location.*;
  4. import javax.microedition.io.*;
  5. import javax.microedition.location.*;
  6. import java.io.*;
  7.  
  8. public class Geocoder extends MIDlet implements CommandListener
  9. {
  10.     public Display display;
  11.     public Form form;
  12.     private Command cmdExit,cmdOK;
  13.     public StringItem si, sili;
  14.  
  15.     public Geocoder()
  16.     {
  17.  
  18.         display =Display.getDisplay(this);
  19.         form = new Form("Location Api test");
  20.         cmdExit = new Command("Exit",Command.EXIT,5);
  21.         cmdOK = new Command("OK",Command.OK,1);
  22.         si = new StringItem("Coordinates", "Press OK");
  23.         sili = new StringItem("Location", "");
  24.         form.append(si);
  25.         form.append(sili);
  26.         form.addCommand(cmdOK);
  27.         form.addCommand(cmdExit);
  28.         form.setCommandListener(this);
  29.     }
  30.  
  31.     public void startApp()
  32.     {
  33.         display.setCurrent(form);
  34.     }
  35.  
  36.  
  37.     public void pauseApp()
  38.     {}
  39.  
  40.     public void destroyApp(boolean flag) {
  41.         notifyDestroyed();
  42.     }
  43.  
  44.     public void commandAction(Command c, Displayable d)
  45.     {
  46.         if (c == cmdOK){
  47.             Retriever ret = new Retriever(this);
  48.             ret.start();
  49.  
  50.         } else if (c == cmdExit) {
  51.             destroyApp(false);
  52.         }
  53.     }
  54.  
  55.     public void displayString(String string)
  56.     {
  57.         si.setText(string);
  58.     }
  59.  
  60.     public void showAlert(String message) {
  61.         Alert alert = new Alert("Alert",message,null,AlertType.WARNING);
  62.         display.setCurrent(alert,form);
  63.     }
  64.  
  65.  
  66.  
  67.  
  68. }
  69.  
  70. class Retriever extends Thread {
  71.  
  72.     private Geocoder midlet;
  73.     Form formRunning;
  74.     Gauge gauge;
  75.  
  76.  
  77.  
  78.     public Retriever(Geocoder midlet)
  79.         {
  80.             /**
  81.               * Constructor
  82.               *
  83.               * EFFECTS: Initialise the server and store midlet information
  84.               *
  85.               * @param midlet The main application midlet
  86.               * @param server Forecast Server URL
  87.               *
  88.               */
  89.             this.midlet = midlet;
  90.             formRunning = new Form("Retrieving Info");
  91.             formRunning.append(new Gauge("Processing",false,Gauge.INDEFINITE,Gauge.CONTINUOUS_RUNNING));
  92.             midlet.display.setCurrent(formRunning);
  93.  
  94.     }
  95.  
  96.     public void run()
  97.         {
  98.             /**
  99.             * Entry point of the thread
  100.             *
  101.             * EFFECTS: call to connect() method
  102.             */
  103.             try {
  104.                             checkLocation();
  105.                         } catch (Exception ex)
  106.                         {
  107.                             ex.printStackTrace();
  108.                             midlet.displayString(ex.toString());
  109.             } finally {
  110.  
  111.             }
  112.  
  113.  
  114.         }
  115.  
  116.     public void checkLocation() throws Exception
  117.     {
  118.         String string;
  119.         Location l;
  120.         LocationProvider lp;
  121.         Coordinates c;
  122.         // Set criteria for selecting a location provider:
  123.         // accurate to 500 meters horizontally
  124.         Criteria cr= new Criteria();
  125.         cr.setHorizontalAccuracy(5000);
  126.         cr.setVerticalAccuracy(5000);
  127.  
  128.         // Get an instance of the provider
  129.         lp= LocationProvider.getInstance(cr);
  130.  
  131.         // Request the location, setting a one-minute timeout
  132.         l = lp.getLocation(120);
  133.         c = l.getQualifiedCoordinates();
  134.  
  135.         if(c != null ) {
  136.           // Use coordinate information
  137.           double lat = c.getLatitude();
  138.           double lon = c.getLongitude();
  139.           string = "\nLatitude : " + lat + "\nLongitude : " + lon;
  140.           new GetData(midlet,lat,lon).start();
  141.  
  142.         } else {
  143.             string ="Location API failed";
  144.         }
  145.  
  146.         formRunning.append("Obtained coordinates...");
  147.         midlet.displayString(string);
  148.     }
  149. }
  150.  
  151. class GetData implements Runnable,CommandListener {
  152.  
  153. Geocoder midlet;
  154. double lat, lon;
  155.  
  156. public GetData (Geocoder midlet, double lat, double lon) {
  157.  
  158.     this.lat = lat;
  159.     this.lon = lon;
  160.     this.midlet = midlet;
  161.  
  162.  
  163. }
  164.  
  165. public void commandAction (Command cmd,Displayable disp)
  166. {
  167.  
  168. }
  169.  
  170. public void start() {
  171.        Thread t = new Thread(this);
  172.        t.start();
  173. }
  174.  
  175.  
  176. public void run() {
  177.     HttpConnection conn=null;
  178.     InputStream is=null;
  179.     String sb;
  180.  
  181.     try {
  182.             String sUrl = "http://tinygeocoder.com/create-api.php?g="+""+lat+","+""+lon;
  183.             conn = (HttpConnection) Connector.open(sUrl,Connector.READ);
  184.             if (conn.getResponseCode() == HttpConnection.HTTP_OK) {
  185.                     is = conn.openInputStream();
  186.                     byte buf[] = new byte[128];
  187.                     int total =0;
  188.                     while (total <128) {
  189.                         int count = is.read(buf,total,128-total);
  190.                         if (count<0) {
  191.                             break;
  192.                         }
  193.                         total += count;
  194.                     }
  195.  
  196.                     sb = new String(buf,0,total);
  197.  
  198.                     if (sb.length() <10) {
  199.                             midlet.showAlert("Connection error, please try again");
  200.                             is.close();
  201.                             conn.close();
  202.  
  203.                             return;
  204.                     }
  205.  
  206.                       midlet.sili.setText(sb);
  207.                     //midlet.form.append(sb);
  208.                     //vectorized();
  209.                     //midlet.saveCurrency(false,midlet.vector);
  210.                     //midlet.display.setCurrent(midlet.form);
  211.             } else if (conn.getResponseCode() == HttpConnection.HTTP_NOT_FOUND) {
  212.                     midlet.showAlert("URL not found");
  213.  
  214.             } else {
  215.                 midlet.showAlert("Server busy or unavailable. Please try again later");
  216.             }
  217.  
  218.     } catch (SecurityException sex) {
  219.         midlet.showAlert("Connection failed. You need to authorize this application to access network");
  220.     } catch (IOException ioex) {
  221.             midlet.showAlert("Connection failed. Please try again later.");
  222.     } catch (Exception e){
  223.         midlet.showAlert(e.toString());
  224.         e.printStackTrace();
  225.         //midlet.display.setCurrent(midlet.form);
  226.     } finally {
  227.         try {
  228.             if (is != null) {
  229.                 is.close();
  230.             }
  231.  
  232.             if (conn != null) {
  233.                 conn.close();
  234.             }
  235.         } catch (IOException ioexception) {}
  236.             is =null;
  237.             conn =null;
  238.             midlet.display.setCurrent(midlet.form);
  239.  
  240.  
  241.     }
  242. }
  243.  
  244.  
  245. public String URLEncode(String s)
  246. {
  247.         if (s!=null) {
  248.             StringBuffer tmp = new StringBuffer();
  249.             int i=0;
  250.             try {
  251.                 while (true) {
  252.                     int b = (int)s.charAt(i++);
  253.                     if ((b>=0x30 && b<=0x39) || (b>=0x41 && b<=0x5A) || (b>=0x61 && b<=0x7A)) {
  254.                         tmp.append((char)b);
  255.                     }
  256.                     else {
  257.                         tmp.append("%");
  258.                         if (b <= 0xf) tmp.append("0");
  259.                         tmp.append(Integer.toHexString(b));
  260.                     }
  261.                 }
  262.             }
  263.             catch (Exception e) {}
  264.             return tmp.toString();
  265.         }
  266.         return null;
  267. }
  268. }

The code requires mobile device which implements JSR-179 Location API and has been tested on Nokia E71 and 6210 Navigator.


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Kirodict – a Compact, Lightweight JavaME mobile dictionary

February 8th, 2009 1 Comment   Posted in J2ME / JavaME, Java, Mobile Software, Motorola, Nokia, Sony Ericsson, Symbian

Finally after spending a couple months working on this on and off personal project, I decided to release the final version of Kirodict - a lightweight mobile dictionary.

As it name implies, Kirodict was designed to be small in size while maintaining its functionality as a fully fledge dictionary for mobile and embedded device. Kirodict acts as a front-end to an RFC2229 (dict.org) compatible server which it obtain the word definition from.

Kirodict - compact mobile dictionary

Its small and compact size as well as its portability makes it an attractive application to be downloaded and installed on your mobile phone. Kirodict requires mobile phones with at least these feature :

  • MIDP 2.0 /CLDC 1.0 compatible phones
  • 128kB of free storage space
  • Phone with network connection (3G, GPRS, Wifi, wimax)

With lower requirements, it can be installed on a lower end phone without much problem. Kirodict does not use additional storage space as it does not cache its results.

Kirodict can be downloaded from Kirodict Google Code project website and it is licensed under the GNU General Public License version 2.0


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Primosync: Synchronize Google Calendar with Mobile Phone

January 31st, 2009 4 Comments   Posted in J2ME / JavaME, Mobile Games, Mobile Software, Open Source

Primosync Google Calendar

This week, I've tried Primosync, a JavaME application which allows you to synchronize your Calendar, Events and activities with Google Calendar.

Primosync is compatible with mobile phone which supports JavaME JSR-75 PIM API, a feature that becoming common in latest modern phones.

Advantages of syncing phone calendar with Google Calendar :

  • You will be able to access your event, activities and reminders anywhere with internet connection
  • Your events and reminder will be more portable across various phone models as you can sync it with Google Calendar to update your Calendar
  • Easier to keep track of your reminder and events
  • As a backup measure in case if your mobile phone is stolen or lost

You can download it from Primosync Google Code project website (yes it is open source!) or from Primosync.mobi download site (mobile phone friendly). Available in 3 versions (Blackberry, JavaME Signed, JavaME Unsigned), for some reasons, I was unable to install the Signed version of Primosync in my E71. So I figure the Unsigned version might work in more phones.

So lets start syncing!


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I bought a new phone – Nokia E71

December 26th, 2008 4 Comments   Posted in J2ME / JavaME, Java, Nokia, Smartphone, Symbian

I know I've been slacking lately on my post.. but hey, I got myself a new phone - The Nokia E71!

Phones model and features are getting diverse now and I've noticed that its getting harder and harder to choose a phone that really suits my needs. For example, one feature found on Phone A isnt necessarily can be found on Phone B.

So it took me a while to replace my good old 6630 that has been stolen few months before. But hey, I'm back on my feet now.

Nokia E71 papit

Among the key feature that attract me to buy this phone are :

  • Location API support (JSR-179) with built in GPS receiver
  • QWERTY keyboard
  • Ease of handling, my hands a bit slippy on its sister's phone E66
  • Battery last longer
  • Hot swappable micro-sd card
  • More than adequate internal memory

    • \

  • Supports WiFi

The only drawback that I could think of this phone is its camera that is not as good as the N95,N96 series phone. But I can still live with that since I rarely use the camera anyway.

Other additional feature
The phone comes with Advance Call Manager and Multi Scanner free of charge, making it easier to filter out unwanted call and to manage phone blacklist.

Multi Scanner allows you to take a photo of name card and automatically store important information (Name, Phone Number, Address, Company's Name, Fax Number) right into the phone.

I hope I can be more productive at updating this blog and producing new mobile applications with this phone.


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How to get Nokia Battery Level in JavaME

November 9th, 2008 1 Comment   Posted in J2ME / JavaME, Java, Nokia, Tips, Tricks, Guide

Nokia Symbian 3rd Edition phone introduces "com.nokia.mid.batterylevel" properties which you can get the current battery charge level by calling System.getProperty("com.nokia.mid.batterylevel") from within your midlet application. Its up to your imagination for you to do the rest.

Sample source code (displaying battery charge level on gauge):

PLAIN TEXT
JAVA:
  1. /**********
  2. /*
  3. /* Nokia Battery Level midlet
  4. /* Copyright 2008 Mohammad Hafiz bin Ismail (info@mypapit.net)
  5. /* http://mobilepit.com
  6. /*
  7. /* May be use freely
  8. **********/
  9. import javax.microedition.midlet.*;
  10. import javax.microedition.lcdui.*;
  11.  
  12. public class NokiaBattery extends MIDlet implements CommandListener {
  13.  
  14. int value;
  15. Display display;
  16. Form form;
  17. Gauge gauge;
  18. Command cmdExit;
  19.  
  20. public NokiaBattery() {
  21.  display = Display.getDisplay(this);
  22.  form = new Form("Nokia Battery");
  23.  cmdExit = new Command("Exit",Command.EXIT,1);
  24.  form.addCommand(cmdExit);
  25.  value=Integer.parseInt(System.getProperty("com.nokia.mid.batterylevel"));
  26.  gauge = new Gauge("Level",false,100,value);
  27.  form.append(gauge);
  28. form.append("Value :"+value);
  29.  
  30.  StringItem item = new StringItem("Network Signal",System.getProperty("com.nokia.mid.networksignal"));
  31.  form.append(item);
  32.  form.setCommandListener(this);
  33. }
  34.  
  35. public void startApp(){
  36.       display.setCurrent(form);
  37. }
  38.  
  39. public void pauseApp() {}
  40.  
  41. public void destroyApp(boolean flags) {
  42.  
  43.     notifyDestroyed();
  44. }
  45.  
  46.  
  47. public void commandAction (Command cmd, Displayable disp)
  48. {
  49.     if (cmd == cmdExit) {
  50.         destroyApp(false); 
  51.     }
  52. }
  53.  
  54. }

Download source code and sample midlet : NokiaBattery_midlet.zip


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Free Skype JavaME (J2ME) client for mobile device

June 27th, 2008 11 Comments   Posted in Mobile Software

Great news for those who are using Skype to get connected with their contacts, now they can do so while on the move with the free Skype mobile client.

The mobile client offers chat feature as well as receiving calls from Skype contacts. However airtime charge may incur for receiving voice call, depending on the subscribers' data plan.

The main advantage of this J2ME client is portability across a wide-range of mobile devices which implements MIDP 2.0. Although the Skype Mobile website lists only handful of supported device, in reality Mobile Skype is supported on a lot more devices.

Disadvantages include its inability to send SMS to your contacts and the inability to make voice calls. However in my opinion, the free Mobile Skype does its best considering it is written for mobile devices with limited capabilities.

You can download Skype Mobile from this website : http://mobiledownload.skype.com/

Tips
With little creativity on java jad file, you can install Mobile Skype on any MIDP 2.0 supported device without much trouble


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