Question

我想在BlackBerry Os 6中实现QR码阅读器。我在KB文章How to use the Barcode API的基础上尝试以下代码。

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(); 
    } 
}

守则不起作用。 无法识别QR码。我尝试着重于不同的QR码。但它没有解码qrcodes.Also它没有抛出任何例外。请帮助我....

我尝试使用这些设备： BB珍珠9105和BB风暴9530

Answer 1

请参阅以下链接中的示例。它将为您提供帮助

http://aliirawan-wen.blogspot.com/2011/05/barcode-scanner-for-blackberry-os-50.html

Answer 2

我是BB开发的新手，但我注意到你将“this”作为decoderlistener参数传递，或许这会导致问题？

    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();
    } 
}

BlackBerry OS 6.0中的QR Code实时扫描

2 个答案: