二维码扫描（横屏、竖屏、解决竖屏后拉伸问题、美化扫描框）

以前上传过一个源码：Android二维码扫描简单源码

是根据zxing的源码进行简化的，不过只支持横屏。

其实支持竖屏也挺简单的：【http://stackoverflow.com/questions/16252791/zxing-camera-in-portrait-mode-on-android】

Step 1: Add following lines to rotate data before

buildLuminanceSource(..)

in decode(byte[]
data, int width, int height)

DecodeHandler.java:

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;

PlanarYUVLuminanceSource source = activity.getCameraManager().buildLuminanceSource(rotatedData, width, height);

Step 2: Modify

getFramingRectInPreview()

.

CameraManager.java

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;

Step 3: Disable the check for Landscape Mode in

initFromCameraParameters(...)

CameraConfigurationManager.java

//remove the following
if (width < height) {
Log.i(TAG, "Display reports portrait orientation; assuming this is incorrect");
int temp = width;
width = height;
height = temp;
}

Step 4: Add following line to rotate camera in

setDesiredCameraParameters(...)

CameraConfigurationManager.java

camera.setDisplayOrientation(90);

Step 5: Do not forget to set orientation of activity to portrait. I.e: manifest
但是这样之后，会出现拉伸的问题，解决方法如下：
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);

如果想美化一下取景框，可以参看代码：https://code.csdn.net/snippets/64838