QR Code Live Scanning in BlackBerry OS 6.0 - blackberry

Question

I want to Implement a QR Code Reader In BlackBerry Os 6. I try the following Code On the Basis of KB Article How to use the Barcode API.
public class ScanScreen extends MainScreen implements BarcodeDecoderListener
{
private LabelField match;
private BarcodeScanner scanner;
public ScanScreen()
{
match = new LabelField("Scanning...");
add(match);
Vector supported = new Vector();
supported.addElement(BarcodeFormat.QR_CODE);
Hashtable hints = new Hashtable();
hints.put(DecodeHintType.POSSIBLE_FORMATS, supported);
hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
BarcodeDecoder decoder = new BarcodeDecoder(hints);
try
{
scanner = new BarcodeScanner(decoder, this);
add(scanner.getViewfinder());
scanner.startScan();
}
catch (Exception e)
{
e.printStackTrace();
match.setText("Exception");
invalidate();
}
}
public void barcodeDecoded(String rawText)
{
match.setText("Found: " + rawText);
invalidate();
}
public void close()
{
try
{
scanner.stopScan();
}
catch (Exception e)
{
e.printStackTrace();
}
super.close();
}
}
The Code not working. It do not recognize QR codes. I try to focus on different QR codes. But it not decode The qrcodes.Also It not Thrown Any exceptions. Please Help me....
I tried using these Devices: BB pearl 9105 and BB Storm 9530

Answer 1

See the sample from the following link.It will help you
http://aliirawan-wen.blogspot.com/2011/05/barcode-scanner-for-blackberry-os-50.html

Answer 2

I'm painfully new to BB development, but I notice you pass "this" as the decoderlistener parameter, perhaps that's causing a problem?
BarcodeDecoder decoder = new BarcodeDecoder(hints);
BarcodeDecoderListener decoderListener = new BarcodeDecoderListener()
{
public void barcodeDecoded(String rawText)
{
displayMessage(rawText);
}
};
try
{
scanner = new BarcodeScanner(decoder, decoderListener)
add(scanner.getViewfinder());
scanner.startScan();
}
catch (Exception e)
{
e.printStackTrace();
match.setText("Exception");
invalidate();
}
}