修改ZXing二维码扫描为竖屏模式

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(原文中第4步掉了一句很关键的代码   data = rotatedData;   加在 height = tmp; 后面就可以扫到结果了    把 PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(data, width, height); 中的data换成 rotatedData   也可以  一个意思
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修改ZXing For Android 为竖屏模式，经过实践，可行方法如下：

1、修改AndroidManifest文件，将CaptureActivity设为portrait：
 

  代码为：android:configChanges="orientation|keyboardHidden"
                    android:screenOrientation="portrait"

2、把摄像头预览景调为竖向，具体如下：
  1）在CameraConfigurationManag er类里的setDesiredCameraParamete rs(Cameracamera)方法里添加如下代  码：
//摄像头旋转90度
setDisplayOrientation(camera, 90);
  2）然后在CameraConfigurationManag er类里面添加setDisplayOrientation(Cameracamera, int angle)方法，方法具体代码如下：

      protectedvoid setDisplayOrientation(Camera camera, int angle) {

            MethoddownPolymorphic;             

              try { 
                   
                        downPolymorphic =camera.getClass().getMethod("setDisplayOrientation", new Class[] {int.class });
           
                    if (downPolymorphic != null)
                         
                          downPolymorphic.invoke(camera, new Object[] {angle});             
           
              } catch (Exception e1){     
                    e1.printStackTrace();
              }           

}     
3）最后，为了防止摄像头竖过来后图像拉伸的问题，需要在CameraConfigurationManag er类中的initFromCameraParameters (Cameracamera)方法的Log.d(TAG, "Screen resolution: " +screenResolution);语句后面添加如下代码：
//解决竖屏后图像拉伸问题
      PointscreenResolutionForCamer a = newPoint();     
      screenResolutionForCamer a.x =screenResolution.x;     
      screenResolutionForCamer a.y =screenResolution.y;     
      // previewsize is always something like 480*320, other 320*480
      if(screenResolution.x < screenResolution.y){   
              screenResolutionForCamer a.x =screenResolution.y;   
              screenResolutionForCamer a.y =screenResolution.x;
      }
  cameraResolution =getCameraResolution(parameters, screenResolutionForCamer a);
3、把CameraManager类中getFramingRectInPreview()方法中的代码做如下修改：
  将：//横屏模式
          rect.left = rect.left * cameraResolution.x /screenResolution.x;
          rect.right = rect.right * cameraResolution.x /screenResolution.x;
          rect.top = rect.top * cameraResolution.y /screenResolution.y;
          rect.bottom = rect.bottom * cameraResolution.y /screenResolution.y;
替换为：
        //竖屏模式
          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DecodeHandler类中的decode(byte[] data, int width, intheight)方法中，在buildLuminanceSource调用前添加如下代码：
//竖屏
      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;

至此，运行程序，竖屏模式完成。