[移动开发]android相机拉伸解决办法

公司要做安卓开发板的双目识别项目，采用的是Camera+SurfaceView ，其实TextureView这个也是一样的原理。采用的是腾讯本地人脸识别方案，其实所有家的人脸识别道理都是相通的，主要相机采集数据-分析人脸数据-识别，，，，

但是同样遇到了一些问题，首先是摄像头拉伸问题，解决这个问题需要了解相机原理，以分辨率640*480为例? ? 那相机呈现的是这样的

那这样是不拉伸的 我的机器是1280*800的 那如果铺满全屏 那就是相机分辨率和屏幕分辨率是成比例放大的 那就需要拉伸SurfaceView达到和布局一样的分辨率，如图所示

那就是把SurfaceView相机的比例同比扩大相应的倍数才可以下面是我处理方式 然后我在调整布局到中间 就可以了，相机拉伸问题就解决了

   private void initLayout() {
        int surfaceViewWidth = getWidth();
        int surfaceViewHeight = getHeight();
        int cameraWidth = 0;
        int cameraHeight = 0;
        RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) faceRelativeLayout.getLayoutParams();
        //判断相机方向需要改变更改宽和高
        if (StaticVariables.isRotation) {
            cameraWidth = StaticVariables.cameraWidth;
            cameraHeight = StaticVariables.cameraHeight;
        } else {
            cameraWidth = StaticVariables.cameraHeight;
            cameraHeight = StaticVariables.cameraWidth;
        }
        //如果相机比例相等 不做拉伸
        if (Chufa(surfaceViewWidth, cameraWidth) == Chufa(surfaceViewHeight, cameraHeight)) {
            layoutParams.width = surfaceViewWidth;
            layoutParams.height = surfaceViewHeight;
            StaticVariables.faceCameraViewWidth = layoutParams.width;
            StaticVariables.faceCameraViewHeight = layoutParams.height;
            StaticVariables.faceCameraViewLeft = 0;
            StaticVariables.faceCameraViewRight = surfaceViewWidth;
            StaticVariables.faceCameraViewTop = 0;
            StaticVariables.faceCameraViewDown = surfaceViewHeight;

        } else
            //如果相机与画布比例不等 ，计算画布大小 以及识别范围
            if (Chufa(surfaceViewWidth, cameraWidth) > Chufa(surfaceViewHeight, cameraHeight)) {

            layoutParams.width = surfaceViewWidth;
            layoutParams.height = (int) (cameraHeight * Chufa(surfaceViewWidth, cameraWidth));
            layoutParams.topMargin = (surfaceViewHeight - layoutParams.height) / 2;
            layoutParams.bottomMargin = (surfaceViewHeight - layoutParams.height) / 2;
            StaticVariables.faceCameraViewWidth = layoutParams.width;
            StaticVariables.faceCameraViewHeight = layoutParams.height;
            StaticVariables.faceCameraViewLeft = 0;
            StaticVariables.faceCameraViewRight = surfaceViewWidth;
            StaticVariables.faceCameraViewTop = -layoutParams.topMargin;
            StaticVariables.faceCameraViewDown = -layoutParams.topMargin + surfaceViewHeight;
        } //如果相机与画布比例不等 ，计算画布大小 以及识别范围
            else {
            layoutParams.width = (int) (cameraWidth * Chufa(surfaceViewHeight, cameraHeight));
            layoutParams.height = surfaceViewHeight;
            layoutParams.leftMargin = (surfaceViewWidth - layoutParams.width) / 2;
            layoutParams.rightMargin = (surfaceViewWidth - layoutParams.width) / 2;
            StaticVariables.faceCameraViewWidth = layoutParams.width;
            StaticVariables.faceCameraViewHeight = layoutParams.height;
            StaticVariables.faceCameraViewLeft = -layoutParams.leftMargin;
            StaticVariables.faceCameraViewRight = -layoutParams.leftMargin + surfaceViewWidth;
            StaticVariables.faceCameraViewTop = 0;
            StaticVariables.faceCameraViewDown = surfaceViewHeight;

        }

        faceRelativeLayout.setLayoutParams(layoutParams);
        faceRelativeLayout.requestLayout();
    }