二维码变形问题

可能有两个原因：
1、屏幕旋转导致的，增加以下代码即可

        Point screenResolutionForCamera = new Point();        screenResolutionForCamera.x = screenResolution.x;        screenResolutionForCamera.y = screenResolution.y;        //防止屏幕旋转时二维码变形        if (screenResolution.x < screenResolution.y) {            screenResolutionForCamera.x = screenResolution.y;            screenResolutionForCamera.y = screenResolution.x;        }

2、扫码界面的宽高比必须和相机预览尺寸的比例相同或者接近，不然二维码会变形

        Camera.Parameters parameters = camera.getParameters();        //设置相机预览的分辨率        //扫码界面的布局的宽高的比例必须和相机预览分辨率的比例相同或者接近，不然二维码就会变形        parameters.setPreviewSize(cameraResolution.x, cameraResolution.y);

拿取相机预览的分辨率

 /**     * 拿取相机预览的分辨率     *     * @param parameters       本机Camera的Parameters     * @param screenResolution 屏幕分辨率     * @return     */    private static Point getCameraResolution(Camera.Parameters parameters,                                             Point screenResolution) {        //当前支持的拍照预览尺寸        String previewSizeValueString = parameters.get("preview-size-values");        if (previewSizeValueString == null) {            previewSizeValueString = parameters.get("preview-size-value");        }        Point cameraResolution = null;        //如果有本机支持的拍照预览尺寸，那么依据它和屏幕分辨率，确定相机预览的分辨率        if (previewSizeValueString != null) {            cameraResolution = findBestPreviewSizeValue(previewSizeValueString,                    screenResolution);        }        //如果没有本机支持的拍照预览尺寸，那么依据屏幕分辨率，确定相机预览的分辨率        if (cameraResolution == null) {            cameraResolution = new Point((screenResolution.x >> 3) << 3,                    (screenResolution.y >> 3) << 3);        }        return cameraResolution;    }

 /**     * 确定相机预览的分辨率     *     * @param previewSizeValueString 本机支持的拍照预览尺寸     * @param screenResolution       屏幕分辨率     * @return     */    private static Point findBestPreviewSizeValue(            CharSequence previewSizeValueString, Point screenResolution) {        int bestX = 0;        int bestY = 0;        int diff = Integer.MAX_VALUE;        //例如preview-size-values=1280x720,800x480,768x432,720x480,640x480,576x432,480x320,384x288,352x288,320x240        //拿取每一组分辨率        //如果这组分辨率和屏幕的分辨率相同，那么返回这组        //如果没有相同的，就返回最接近的        for (String previewSize : COMMA_PATTERN.split(previewSizeValueString)) {            previewSize = previewSize.trim();            int dimPosition = previewSize.indexOf('x');            if (dimPosition < 0) {                continue;            }            int newX;            int newY;            try {                newX = Integer.parseInt(previewSize.substring(0, dimPosition));                newY = Integer.parseInt(previewSize.substring(dimPosition + 1));            } catch (NumberFormatException nfe) {                continue;            }            int newDiff = Math.abs(newX - screenResolution.x)                    + Math.abs(newY - screenResolution.y);            if (newDiff == 0) {                bestX = newX;                bestY = newY;                break;            } else if (newDiff < diff) {                bestX = newX;                bestY = newY;                diff = newDiff;            }        }        if (bestX > 0 && bestY > 0) {            return new Point(bestX, bestY);        }        return null;    }

最后贴出Camera.Parameters：
相机参数简单介绍：
D/CAM_Util(25287): Dump all camera parameters:
D/CAM_Util(25287): zoom=0 //变焦参数，为0表示未变焦
D/CAM_Util(25287): fb-smooth-level-max=4 // 磨皮等级设置，最高为4级
D/CAM_Util(25287): max-num-detected-faces-hw=15 //硬件支持的最多可以检测人脸张数 15张
D/CAM_Util(25287): cap-mode=normal //拍照模式
D/CAM_Util(25287): aflamp-mode-values=off,on,auto //暂时不知道
D/CAM_Util(25287): whitebalance=auto //白平衡参数，自动白平衡
D/CAM_Util(25287): afeng-min-focus-step=0 //暂时未知
D/CAM_Util(25287): preview-format-values=yuv420sp,yuv420p,yuv420i-yyuvyy-3plane //预览数据格式
D/CAM_Util(25287): rotation=0 //预览数据旋转角度
D/CAM_Util(25287): jpeg-thumbnail-quality=100 //照片缩略图压缩比
D/CAM_Util(25287): preview-format=yuv420sp //当前预览数据格式
D/CAM_Util(25287): iso-speed=auto //iso设置，当前是自动iso
D/CAM_Util(25287): flash-mode-values=off,on,auto,red-eye,torch //闪光灯各项设置值
D/CAM_Util(25287): hue-values=low,middle,high //色度设置值
D/CAM_Util(25287): aflamp-mode=off //暂时未知
D/CAM_Util(25287): cshot-indicator-supported=true //暂时未知
D/CAM_Util(25287): preview-frame-rate=30 //当前预览帧率
D/CAM_Util(25287): jpeg-thumbnail-width=160 //照片缩略图宽度为 160个像素
D/CAM_Util(25287): video-size=640x480 //当前录像尺寸
D/CAM_Util(25287): scene-mode-values=auto,portrait,landscape,night,night-portrait,theatre,beach,snow,sunset,steadyphoto,fireworks,sports,party,candlelight,hdr //当前支持的场景模式
D/CAM_Util(25287): preview-fps-range-values=(5000,60000) //暂时未知
D/CAM_Util(25287): contrast-values=low,middle,high //当前支持的对比度设置
D/CAM_Util(25287): preview-size-values=176x144,320x240,352x288,480x320,480x368,640x480,720x480,800x480,800x600,864x480,960x540,1280x720,1920x1080 //当前支持的拍照预览尺寸
D/CAM_Util(25287): preview-fps-range=5000,60000 //当前未知
D/CAM_Util(25287): min-exposure-compensation=-12 //最小曝光补偿设置值
D/CAM_Util(25287): antibanding=50hz //防牛顿环频率设置
D/CAM_Util(25287): max-num-focus-areas=1 //最大支持的对焦区域，为1表示只支持单点对焦
D/CAM_Util(25287): vertical-view-angle=49 //暂时未知
D/CAM_Util(25287): fb-smooth-level-min=-4 //人脸美化平滑等级最小值
D/CAM_Util(25287): fb-skin-color=0 //人脸美化皮肤颜色设置值
D/CAM_Util(25287): video-stabilization-supported=true //是否支持视频防抖
D/CAM_Util(25287): brightness_value=-34 //拍照亮度设置
D/CAM_Util(25287): saturation-values=low,middle,high //饱和度设置
D/CAM_Util(25287): eng-flash-duty-value=-1 //暂时未知
D/CAM_Util(25287): edge=middle //暂时未知
D/CAM_Util(25287): picture-format-values=jpeg //照片压缩格式
D/CAM_Util(25287): iso-speed-values=auto,100,200,400,800,1600 //当前支持的iso设置值
D/CAM_Util(25287): exposure-compensation-step=0.25 //曝光补偿步径值
D/CAM_Util(25287): eng-flash-duty-min=0 //暂时未知
D/CAM_Util(25287): picture-size=4160x3120 //当前设置的照片尺寸
D/CAM_Util(25287): saturation=middle //饱和度
D/CAM_Util(25287): whitebalance-values=auto,incandescent,fluorescent,warm-fluorescent,daylight,cloudy-daylight,twilight,shade //当前支持的白平衡设置
D/CAM_Util(25287): picture-format=jpeg //图片格式
D/CAM_Util(25287): cshot-indicator=true //暂时未知
D/CAM_Util(25287): afeng-max-focus-step=0 //暂时未知
D/CAM_Util(25287): preferred-preview-size-for-video=1920x1080 //推荐的视频录制尺寸
D/CAM_Util(25287): hue=middle //色度
D/CAM_Util(25287): recording-hint=true //录像指示器
D/CAM_Util(25287): eng-focus-fullscan-frame-interval-max=65535 //暂时未知
D/CAM_Util(25287): video-stabilization=false //是否开启录像防抖
D/CAM_Util(25287): zoom-supported=true //是否支持变焦
D/CAM_Util(25287): fb-smooth-level=0 //当前人脸美化平滑等级最小值
D/CAM_Util(25287): fb-sharp=0 //人脸美化锐度
D/CAM_Util(25287): contrast=middle //对比度
D/CAM_Util(25287): scene-mode=auto //场景模式为自动
D/CAM_Util(25287): jpeg-quality=100 //照片压缩比例为100%，即为未压缩
D/CAM_Util(25287): burst-num=1 //当前拍摄张数
D/CAM_Util(25287): eng-flash-duty-max=9 //暂时未知
D/CAM_Util(25287): video-size-values=176x144,480x320,640x480,864x480,1280x720,1920x1080 //当前支持的录像尺寸
D/CAM_Util(25287): preview-size=800x600 //录像预览尺寸
D/CAM_Util(25287): focal-length=3.5 //镜头焦距
D/CAM_Util(25287): eng-focus-fullscan-frame-interval-min=0 //暂时未知
D/CAM_Util(25287): cap-mode-values=normal,face_beauty,continuousshot,smileshot,autorama,mav,asd,motiontrack //当前平台支持的拍照模式
D/CAM_Util(25287): preview-frame-rate-values=15,24,30 //当前平台支持的预览帧率 fps
D/CAM_Util(25287): max-num-metering-areas=9 //当前平台支持的最大测光区域为9块
D/CAM_Util(25287): fb-sharp-max=4 //人脸美化锐度最大值
D/CAM_Util(25287): sensor-type=252 //传感器类型
D/CAM_Util(25287): focus-mode-values=auto,macro,infinity,continuous-picture,continuous-video,manual,fullscan
//当前平台支持的对焦模式
D/CAM_Util(25287): fb-sharp-min=-4 //人脸美化锐度最小值
D/CAM_Util(25287): jpeg-thumbnail-size-values=0x0,160x128,320x240 //当前平台支持的照片缩略图尺寸
D/CAM_Util(25287): zoom-ratios=100,114,132,151,174,200,229,263,303,348,400 //当前平台支持的变焦比例，最大4倍
D/CAM_Util(25287): picture-size-values=320x240,640x480,1024x768,1280x720,1280x768,1280x960,1600x1200,1920x1088,2048x1536,2560x1440,2560x1920,3264x2448,3328x1872,2880x1728,3600x2160,4096x2304,4096x3072,4160x3120 //当前摄像头支持的所有拍照尺寸
D/CAM_Util(25287): edge-values=low,middle,high //暂时未知
D/CAM_Util(25287): horizontal-view-angle=61 //暂时未知
D/CAM_Util(25287): brightness=middle //亮度设置
D/CAM_Util(25287): jpeg-thumbnail-height=128 //照片缩略图高 128pixel
D/CAM_Util(25287): eng-flash-step-max=0 //暂时未知
D/CAM_Util(25287): doc_level=-1 //自定义参数，美颜等级
D/CAM_Util(25287): smooth-zoom-supported=true //是否支持平滑变焦
D/CAM_Util(25287): capfname=/sdcard/DCIM/cap00 //暂时未知，貌似是照片存储路径
D/CAM_Util(25287): zsd-mode=off //零秒快拍模式是否有开启
D/CAM_Util(25287): focus-mode=auto //对焦模式，auto表示自动对焦
D/CAM_Util(25287): fb-skin-color-max=4 //人脸美化皮肤颜色最大值
D/CAM_Util(25287): auto-whitebalance-lock-supported=true //自动白平衡锁定支持
D/CAM_Util(25287): fb-skin-color-min=-4 //人脸美化皮肤颜色最小值
D/CAM_Util(25287): video-frame-format=yuv420p //录像数据格式
D/CAM_Util(25287): max-num-detected-faces-sw=0 //软件检测到的人脸张数，0表示未检测到
D/CAM_Util(25287): max-exposure-compensation=12 //最大曝光补偿等级
D/CAM_Util(25287): max-num-ot=1 //暂时未知
D/CAM_Util(25287): video-snapshot-supported=true //录像的时候是否支持拍照
D/CAM_Util(25287): exposure-compensation=0 //当前曝光补偿值
D/CAM_Util(25287): brightness-values=low,middle,high //亮度设置值
D/CAM_Util(25287): flash-mode=off //闪光灯设置 -关
D/CAM_Util(25287): effect-values=none,mono,negative,sepia,aqua,whiteboard,blackboard //当前平台支持的滤镜设置
D/CAM_Util(25287): eng-flash-step-min=0 //暂时未知
D/CAM_Util(25287): max-zoom=10 //最大变焦倍数 ？
D/CAM_Util(25287): effect=none //当前未开启任何滤镜效果
D/CAM_Util(25287): focus-distances=0.95,1.9,Infinity //对焦距离 ？
D/CAM_Util(25287): mtk-cam-mode=0 //相机模式设置
D/CAM_Util(25287): zsd-mode-values=off,on //零秒快拍设置值
D/CAM_Util(25287): auto-exposure-lock-supported=true //是否支持自动曝光锁定
D/CAM_Util(25287): antibanding-values=off,50hz,60hz,auto //防牛顿环频率设置