If you are interested in J2ME QR Code Encode and Decode, here comes a wonderful J2MEQRCode application. It supports MIDP 2.0 with CLDC 1.0, yes CLDC 1.0. This is the only application that support CLDC 1.0 mobile phone as I know.
It runs on my Motorolla V188 model. Although, there is no camera equiped with this phone, I can still run the application.
With this application, you can encode a string to a QRCode image and then upload to PC or send to your friends.
You can load QRCode image from a website or from your local file, decode it.
You can take a sanpshot of a QRCode with your camera phone and decode it.
You can save the QRCode image to your phone.
Unicode are supported, you can decode a GB2312 Chinese characters QR encoded image on my phone if you phone support Chinese fonts.

If the decoded string is wap page, you can visit it; If the decoded string is a phone number you can make a call; If the decode string is a rtsp protocol, you can view a movie.

Try this application see how it works!

Note: If your phone does not support
JSR 135: Mobile Media MAPI
After download the J2MEQRCode.jad, you only need to delete the line
MIDlet-Push-1: mms://:www.drhu.org.QRCode, J2MEQRCodeMidlet, *
before install in your mobile phone.

Need Online Encode/Decode, click here

Check also the J2MEDataMatrix

IMPORTANT NOTES

Click here to get the activation code for this application! What's new in version v2.0. You will notice that both the speed and decode accuracy improves dramatically! ReedSolomon bug be fixed.
Our Mobile Phone Applications: http://www.drhu.org/product.html