修改ZXing二维码扫描为竖屏模式

修改ZXing二维码扫描为竖屏模式

  (2013-07-02 15:42:42)

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分类： android应用

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CameraConfigurationManag er类里的setDesiredCameraParamete rs(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CameraConfigurationManag er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CameraConfigurationManag er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 screenResolutionForCamer a = new Point();     
       screenResolutionForCamer a.x = screenResolution.x;     
       screenResolutionForCamer a.y = screenResolution.y;     
       // preview size is always something like 480*320, other 320*480
       if (screenResolution.x < screenResolution.y) {   
                screenResolutionForCamer a.x = screenResolution.y;   
                screenResolutionForCamer a.y = screenResolution.x;
       }
  cameraResolution = getCameraResolution(parameters, screenResolutionForCamer a);
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。