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Zxing2.1扫描取景框变形问题解决

news 来源：原创 2024/9/22 1:53:37

修改竖屏扫描的贴子，2.0之前的都很适用。可是到了2.1，有些贴子的做法可以将扫描框改为竖屏，但是取景框里扫描到的东西是变形的（扁的），本人仔细研究一番，终于解决了这个问题，下面贴出解决办法：

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));

第5步应该这样子：
void initFromCameraParameters(Camera camera) {
Camera.Parameters parameters = camera.getParameters();
previewFormat = parameters.getPreviewFormat();
previewFormatString = parameters.get("preview-format");
WindowManager manager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
Display display = manager.getDefaultDisplay();
int width = display.getWidth();
int height = display.getHeight();
screenResolution = new Point(width,height);
if(width < height)
{
cameraResolution = getCameraResolution(parameters, new Point(height,width));
}else{
cameraResolution = getCameraResolution(parameters, screenResolution);
}
}