Android开源二维码识别项目zxing横屏改为竖屏识别解决方案
在网上找了很多方法，但最后都有问题，自己调试了好几个小时，最后终于完美解决了竖屏识别。
首先你需要有zxing项目的简化版代码。
使用简化版可以免去许多不必要的代码，方便学习研究，更好定位核心功能。
如果你调试成功后，就可以着手修改将其变为竖屏识别了。
第1步：
在AndroidManifest中将CaptureActivity的screenOrientation属性做如下修改：
android:screenOrientation="portrait"第2步：
我们要把摄像头预览景调为竖向
CameraConfigurationManager类中的setDesiredCameraParameters()方法中添加如下代码：
// 使摄像头旋转90度setDisplayOrientation(camera, 90);
然后在CameraConfigurationManager类的最后添加setDisplayOrientation()方法:
/*改变照相机成像的方向的方法*/ protected void setDisplayOrientation(Camera camera, int angle) { Method downPolymorphic = null;try {
downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[] { int.class });
i f (downPolymorphic != null )
downPolymorphic.invoke(camera, new Object[]{angle});
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace(); } }
最后在CameraConfigurationManager中的initFromCameraParameters()方法的Log.d(TAG, "Screen resolution: " + screenResolution);句后面添加如下代码，这段代码是为了解决摄像头竖过来后图像拉伸的问题：
//为竖屏添加Point screenResolutionForCamera = new Point();
screenResolutionForCamera.x = screenResolution.x;
screenResolutionForCamera.y = screenResolution.y;
if (screenResolution.x < screenResolution.y) {
screenResolutionForCamera.x = screenResolution.y;
screenResolutionForCamera.y = screenResolution.x;
} // 下句第二参数要根据竖屏修改
cameraResolution = getCameraResolution(parameters, screenResolutionForCamera);
第3步:
CameranManager类中getFramingRectInPreview()方法将：
// 下面为横屏模式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：
/ // 下面为竖屏模式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;
第4步：
PlanarYUVLuminanceSource类中的getRow()方法为识别条形码部分，
getMatrix()方法为识别二维码部分
renderCroppedGreyscaleBitmap()方法为生成获取的码图部分
将getRow()中的：
int offset = (y + top) * dataWidth + left;getMatrix()中的：
int inputOffset = top * dataWidth + left;inputOffset += dataWidth;
renderCroppedGreyscaleBitmap()中的：
int inputOffset = top * dataWidth + left;inputOffset += dataWidth;
这些语句中dataWidth全部替换为dataHeight
同时将PlanarYUVLuminanceSource构造方法中：
if (left + width > dataWidth || top + height > dataHeight) { throw new IllegalArgumentException("Crop rectangle does not fit within image data."); }dataWidth与dateHeight中互换位置即可。
此时，你的程序竖屏识别码图应该没有任何问题了。至于取景框的样式，大家可以在自定义的ViewfinderView中修改成自己喜欢的样式。
http://407827531.iteye.com/blog/1488676
解决方法：
1.在DecodeHandler.java中，修改decode方法
PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(data, width, height);
为
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;
PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(rotatedData, width, height);
2.在CameraManager.java中，注释代码：
// 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;
修改为
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;
3.在CameraConfigurationManager.java中，在setDesiredCameraParameters方法中添加一句
camera.setDisplayOrientation(90);
4.在AndroidManifest.xml中，把Activity的属性android:screenOrientation="landscape"
改为
android:screenOrientation="portrait"
编译运行即可！
参考：
http://code.google.com/p/zxing/issues/detail?id=178#c46
代码：
https://github.com/pplante/zxing-android
zxing横屏改为竖屏识别，多次扫描,以及存在的摄像拉伸的问题
摘自http://www.cnblogs.com/moka/archive/2013/05/24/3096937.html
按照以上做法，可以实现。
使用简化版可以免去许多不必要的代码，方便学习研究，更好定位核心功能。
如果你调试成功后，就可以着手修改将其变为竖屏识别了。
第1步：
在AndroidManifest中将CaptureActivity的screenOrientation属性做如下修改：
android:screenOrientation="portrait"
第2步：
我们要把摄像头预览景调为竖向
CameraConfigurationManager类中的setDesiredCameraParameters()方法中添加如下代码：
// 使摄像头旋转90度 setDisplayOrientation(camera, 90);
然后在CameraConfigurationManager类的最后添加setDisplayOrientation()方法:
/*改变照相机成像的方向的方法*/ protected void setDisplayOrientation(Camera camera, int angle) { Method downPolymorphic = null; try { downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[] { int.class }); if (downPolymorphic != null) downPolymorphic.invoke(camera, new Object[]{angle}); } catch (NoSuchMethodException e) { e.printStackTrace(); } catch (IllegalArgumentException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } }
最后在CameraConfigurationManager中的initFromCameraParameters()方法的Log.d(TAG, "Screen resolution: " + screenResolution);句后面添加如下代码，这段代码是为了解决摄像头竖过来后图像拉伸的问题：
//为竖屏添加 Point screenResolutionForCamera = new Point(); screenResolutionForCamera.x = screenResolution.x; screenResolutionForCamera.y = screenResolution.y; if (screenResolution.x < screenResolution.y) { screenResolutionForCamera.x = screenResolution.y; screenResolutionForCamera.y = screenResolution.x; } // 下句第二参数要根据竖屏修改 cameraResolution = getCameraResolution(parameters, screenResolutionForCamera);
第3步:
CameranManager类中getFramingRectInPreview()方法将：
// 下面为横屏模式 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：
// 下面为竖屏模式 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;
第4步：
PlanarYUVLuminanceSource类中的getRow()方法为识别条形码部分，
getMatrix()方法为识别二维码部分
renderCroppedGreyscaleBitmap()方法为生成获取的码图部分
将getRow()中的：
int offset = (y + top) * dataWidth + left;
getMatrix()中的：
int inputOffset = top * dataWidth + left;
inputOffset += dataWidth;
renderCroppedGreyscaleBitmap()中的：
int inputOffset = top * dataWidth + left;
inputOffset += dataWidth;
这些语句中dataWidth全部替换为dataHeight
同时将PlanarYUVLuminanceSource构造方法中：
if (left + width > dataWidth || top + height > dataHeight) { throw new IllegalArgumentException("Crop rectangle does not fit within image data."); }
dataWidth与dateHeight中互换位置即可。
此时，你的程序竖屏识别码图应该没有任何问题了。至于取景框的样式，大家可以在自定义的ViewfinderView中修改成自己喜欢的样式。
——————————————————————————————
测试，可以竖屏，但是取景还是得横着来。
http://blog.csdn.net/sunmanzth/article/details/6860157 转摘这篇
解决方法：
1.在DecodeHandler.java中，修改decode方法
PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(data, width, height);
为
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;
PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(rotatedData, width, height);
2.在CameraManager.java中，注释代码：
// 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;
修改为
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;
3.在CameraConfigurationManager.java中，在setDesiredCameraParameters方法中添加一句
camera.setDisplayOrientation(90);
4.在AndroidManifest.xml中，把Activity的属性android:screenOrientation="landscape"
改为
android:screenOrientation="portrait"
编译运行即可！
参考：
http://code.google.com/p/zxing/issues/detail?id=178#c46
代码：
https://github.com/pplante/zxing-android
————————
按照下篇的解决方案，成功解决问题。
实现zxing多次扫描问题：
private void continuePreview()
{
SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
SurfaceHolder surfaceHolder = surfaceView.getHolder();
initCamera(surfaceHolder);
if (handler != null)
handler.restartPreviewAndDecode();
}
CaptureActivityHandler中restartPreviewAndDecode属性由private 设置成public
——————————————————————————————
扫描二维码图片时候，正方形的二维码图片，显示会发现变拉长、拉伸。
找着的解决途径如下：
http://www.apkbus.com/android-94078-1-1.html
更改CameraConfigurationManager.java文件
在 Log.d(TAG, "Screen resolution: " + screenResolution);这句之后增加
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;
}
再更改cameraResolution = getCameraResolution(parameters, screenResolution);为cameraResolution = getCameraResolution(parameters, screenResolutionForCamera);
PS:有时间一定要读zxing源码的。