zxing github连接：https://github.com/zxing/zxing

以下为修改方法

Step 1: Add following lines to rotate data before buildLuminanceSource(..) in decode(byte[] data, int width, int height)

DecodeHandler.java:

byte[] rotatedData =newbyte[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;

PlanarYUVLuminanceSource source = activity.getCameraManager().buildLuminanceSource(rotatedData, width, height);

Step 2: Modify getFramingRectInPreview().

CameraManager.java

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;

Step 3: Disable the check for Landscape Mode in initFromCameraParameters(...)

CameraConfigurationManager.java

//remove the following （下面代码新版本，应该是木有了）
if(width < height){Log.i(TAG,"Display reports portrait orientation; assuming this is incorrect");
　int temp = width;
  width = height;
  height = temp;
}

Step 4: Add following line to rotate camera insetDesiredCameraParameters(...)

CameraConfigurationManager.java

camera.setDisplayOrientation(90);

Step 5: Do not forget to set orientation of activity to portrait. I.e: manifest