Android下利用zxing类库实现扫一扫

程序源代码及可执行文件下载地址:http://files.cnblogs.com/rainboy2010/zxingdemo.zip

zxing,一款无比强大的条码解析类库,下面讲解一下如何利用zxing类库实现扫一扫功能,先放上一张效果图:

主要代码如下:

1.在onPreviewFrame方法里获取预览图像，然后传递给DecodeHandler去解析

 public void onPreviewFrame(byte[] data, Camera camera) 

  {

    Point cameraResolution = configManager.getCameraResolution();

    if (!useOneShotPreviewCallback) 

    {

      camera.setPreviewCallback(null);

    }

    if (previewHandler != null) 

    {

      Message message = previewHandler.obtainMessage(previewMessage, cameraResolution.x,cameraResolution.y, data);

      message.sendToTarget();

      previewHandler = null;

    } 

    else 

    {

      Log.d(TAG, "Got preview callback, but no handler for it");

    }

  }

2. 在decode方法里调用zxing类库对图像进行解析

private void decode(byte[] data, int width, int height)

  {

    long start = System.currentTimeMillis();

    Result rawResult = null;

    

    byte[] rotatedData = new byte[data.length];

    for (int y = 0; y < height; y++) {

        for (int x = 0; x < width; x++)

            rotatedData[x * height + height - y - 1] = data[x + y * width];

    }

    int tmp = width; // Here we are swapping, that's the difference to #11

    width = height;

    height = tmp;

    

    PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(rotatedData, width, height);

    BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

    try 

    {

      rawResult = multiFormatReader.decodeWithState(bitmap);

    } catch (ReaderException re) {

      // continue

    } finally {

      multiFormatReader.reset();

    }



    if (rawResult != null) 

    {

      long end = System.currentTimeMillis();

      Log.d(TAG, "Found barcode (" + (end - start) + " ms):\n" + rawResult.toString());

      Message message = Message.obtain(activity.getHandler(), R.id.decode_succeeded, rawResult);

      Log.d(TAG, "Sending decode succeeded message...");

      message.sendToTarget();

    } 

    else 

    {

      Message message = Message.obtain(activity.getHandler(), R.id.decode_failed);

      message.sendToTarget();

    }

  }