二维码识别项目zxing横屏改为竖屏

第1步：

在AndroidManifest中将CaptureActivity的screenOrientation属性做如下修改：

android:screenOrientation="portrait"

第2步：

我们要把摄像头预览景调为竖向

CameraConfigurationManager类中的setDesiredCameraParameters()方法中添加如下代码：

// 使摄像头旋转90度
    setDisplayOrientation(camera, 90);

然后在CameraConfigurationManager类的最后添加setDisplayOrientation()方法:

/*改变照相机成像的方向的方法*/
  protected void setDisplayOrientation(Camera camera, int angle) {
      Method downPolymorphic = null;
      try {
        downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[] { int.class });
        if (downPolymorphic != null)
              downPolymorphic.invoke(camera, new Object[]{angle});
    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    }

  }

最后在CameraConfigurationManager中的initFromCameraParameters()方法的Log.d(TAG, "Screen resolution: " + screenResolution);句后面添加如下代码，这段代码是为了解决摄像头竖过来后图像拉伸的问题：

//为竖屏添加
    Point screenResolutionForCamera = new Point();
    screenResolutionForCamera.x = screenResolution.x;
     screenResolutionForCamera.y = screenResolution.y;
    if (screenResolution.x < screenResolution.y) {
     screenResolutionForCamera.x = screenResolution.y;
     screenResolutionForCamera.y = screenResolution.x;
    }
//  cameraResolution = getCameraResolution(parameters, screenResolutionForCamera);
    cameraResolution = findBestPreviewSizeValue(parameters, screenResolutionForCamera);

第3步:

CameranManager类中getFramingRectInPreview()方法将：

// 下面为横屏模式
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;

改为：

// 下面为竖屏模式
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;

第4部：

在DecodeHandler类中的decode(byte[] data, int width, int height)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;
    data = rotatedData;

最后：

还是不行的话，就修改PlanarYUVLuminanceSource类，如果没有这个类就从其他地方copy。

PlanarYUVLuminanceSource类中的getRow()方法为识别条形码部分，

getMatrix()方法为识别二维码部分

renderCroppedGreyscaleBitmap()方法为生成获取的码图部分

将getRow()中的：

int offset = (y + top) * dataWidth + left;

getMatrix()中的：

int inputOffset = top * dataWidth + left;

inputOffset += dataWidth;

renderCroppedGreyscaleBitmap()中的：

int inputOffset = top * dataWidth + left;

inputOffset += dataWidth;

这些语句中dataWidth全部替换为dataHeight

同时将PlanarYUVLuminanceSource构造方法中：

if (left + width > dataWidth || top + height > dataHeight) {
      throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
    }

dataWidth与dateHeight中互换位置即可。