Question

I am implementing a QR code scanner for blackberry devices and I am using ZXing libraries to do so. This is for os 6+ by the way. The problem I am having is that sometimes, only sometimes, when the camera opens up to prepare scanning, the device will freeze and do a full reboot…

Otherwise it works most of the time, I am able to scan and decode the qr codes etc. However is just seems like it occasionally feels like crashing for no reason. I do not know if it is something with the camera or something in my code, but I will provide the code.

public void scanBarcode() {

    // First we create a hashtable to hold all of the hints that we can
    // give the API about how we want to scan a barcode to improve speed
    // and accuracy.
    Hashtable hints = new Hashtable();

    // The first thing going in is a list of formats. We could look for
    // more than one at a time, but it's much slower.
    Vector formats = new Vector();
    formats.addElement(BarcodeFormat.QR_CODE);
    hints.put(DecodeHintType.POSSIBLE_FORMATS, formats);

    // We will also use the "TRY_HARDER" flag to make sure we get an
    // accurate scan
    hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);

    // We create a new decoder using those hints
    BarcodeDecoder decoder = new BarcodeDecoder(hints);

    // Finally we can create the actual scanner with a decoder and a
    // listener that will handle the data stored in the barcode. We put
    // that in our view screen to handle the display.
    try {
        _scanner = new BarcodeScanner(decoder, new MyBarcodeDecoderListener());
        _barcodeScreen = new MyBarcodeScannerViewScreen(_scanner);

    } catch (Exception e) {
        return;
    }


    // If we get here, all the barcode scanning infrastructure should be set
    // up, so all we have to do is start the scan and display the viewfinder
    try {
        _scanner.stopScan();
        _scanner.getPlayer().start();
        _scanner.startScan();
        UiApplication.getUiApplication().pushScreen(_barcodeScreen);
    } catch (Exception e) {
    }

}

/***
 * MyBarcodeDecoderListener
 * <p>
 * This BarcodeDecoverListener implementation tries to open any data encoded
 * in a barcode in the browser.
 * 
 * @author PBernhardt
 * 
 **/
private class MyBarcodeDecoderListener implements BarcodeDecoderListener {

    public void barcodeDecoded(final String rawText) {

        //UiApplication.getUiApplication().popScreen(UiApplication.getUiApplication().getActiveScreen());
        UtilityDecoder.saveToHistory(rawText);

        try {
            UtilityDecoder.distributeBarcode(rawText);
        } catch (PIMException e) {
        }
    }

}

I basically call scanBarcode() when I click on a button on a toolbar.

Can anyone tell me if my code is the problem, or the device, or something else? Thanks in advance for any help provided!

Answer 1

Try this link:

Scan Any Type of Barcode Image which Supports Blackberry

See this forun link and see the discussions of that link. Surely, you will get overall concept of barcode scanning and you will also get the Implemention of QRCode in version 5.0

Any type of Barcode scaning in 5.0