修改ZXing二维码扫描为竖屏模式

【转】修改ZXing二维码扫描为竖屏模式

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，需要替换CameraConfigurationManager类中的initFromCameraParameters(Camera camera)方法为一下代码

void initFromCameraParameters(Camera camera)
{ 
    Camera.Parameters parameters = camera.getParameters();
    previewFormat = parameters.getPreviewFormat();
    previewFormatString = parameters.get("preview-format");
    Log.d(TAG, "Default preview format: " + previewFormat + '/' 
        + previewFormatString); WindowManager manager = (WindowManager) context
        .getSystemService(Context.WINDOW_SERVICE); 
    Display display = manager.getDefaultDisplay(); 
    screenResolution = new Point(display.getWidth(), display.getHeight()); 
    Log.d(TAG, "Screen resolution: " + screenResolution); 
    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 =findBestPreviewSizeValue(parameters, screenResolutionForCamera);
        // cameraResolution = findBestPreviewSizeValue(parameters, screenResolution); 
        Log.d(TAG, "Camera resolution: " + screenResolution);
    }
}

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;

至此，运行程序，竖屏模式完成。

原文地址：http://blog.sina.com.cn/s/blog_705dc23f0101a78x.html ;
和 http://blog.csdn.net/aaawqqq/article/details/24804939

修改ZXing二维码扫描为竖屏模式

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