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Possible Duplicate:
How to decode QR code
How can i use in an application the camera for scanning QR or bar code and show me the results?
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
startActivityForResult(intent, 0);
What do i have to put then to capture the image and get the information of the product?
I recommend you use ZXing library from google
http://code.google.com/p/zxing/
Android Barcode Scanner, uses that library and its performance is succesful