ZXing二维码开源项目，横屏变竖屏

1.修改manifest文件，将CaptureActivity设为portrait

          android:screenOrientation="portrait"

 

2.在DecodeHandler.java文件中，找到decode(byte[],int,int)方法，在buildLuminanceSource调用前，加上如下：

          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; 
          width = height;
          height = tmp;

          data = rotatedData;

 

3.在CameraManager.java中找到getFramingRectInPreview()方法， 替换相应代码

          rect.left = rect.left * cameraResolution.y / screenResolution.x;
          rect.right = rect.right * cameraResolution.y / screenResolution.x;
          rect.top = rect.top * cameraResolution.x / screenResolution.y;
          rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;

4.在CameraConfigurationManager.java里找到setDesiredCameraParameters()方法，在
  camera.setParameters(parameters)之前加入

          camera.setDisplayOrientation(90);

5.这一步最关键了，之前有人说是去掉一部分代码，这样会导致扫描的东西变扁。正确的方法应该为：在CameraConfigurationManager.java里找到initFromCameraParameters(Camera camera)方法，改为

          Camera.Parameters parameters = camera.getParameters();
          WindowManager manager = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE);
          Display display = manager.getDefaultDisplay();
          int width = display.getWidth();
          int height = display.getHeight();
          if (width < height) {
               int temp = width;
               width = height;
               height = temp;
          }
          screenResolution = new Point(height, width);
          cameraResolution = findBestPreviewSizeValue(parameters, new Point(width, height));

转载来源：http://blog.csdn.net/bxs412/article/details/8616054