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Zxing2.1扫描取景框变形问题解决

时间:2015-08-05 14:33:54      阅读:114      评论:0      收藏:0      [点我收藏+]

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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);
}
}

Zxing2.1扫描取景框变形问题解决

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原文地址:http://www.cnblogs.com/zmc/p/4704420.html

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