phonegap-cordova-二维码扫描横屏改竖屏

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CameraConfigurationManager类里的setDesiredCameraParameters(Camera camera)方法里添加如下代码：
//摄像头旋转90度
setDisplayOrientation(camera, 90);
2）然后在CameraConfigurationManager类里面添加setDisplayOrientation(Camera camera, int angle)方法，方法具体代码如下：

protected void setDisplayOrientation(Camera camera, int angle) {

Method downPolymorphic;

       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CameraConfigurationManager类中的initFromCameraParameters(Camera camera)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
   Point screenResolutionForCamera = new Point();
   screenResolutionForCamera.x = screenResolution.x;
   screenResolutionForCamera.y = screenResolution.y;
   // preview size is always something like 480*320, other 320*480
   if (screenResolution.x < screenResolution.y) {
       screenResolutionForCamera.x = screenResolution.y;
       screenResolutionForCamera.y = screenResolution.x;
   }
cameraResolution = getCameraResolution(parameters, screenResolutionForCamera);
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, 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;
至此，运行程序，竖屏模式完成。