关于自定义相机预览问题的解决

最新推荐文章于 2020-02-25 17:45:12 发布

spring_0101

最新推荐文章于 2020-02-25 17:45:12 发布

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分类专栏：自定义相机问题解决文章标签：自定义相机预览

本文链接：https://blog.youkuaiyun.com/spring_0101/article/details/49685641

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在自定义相机预览时,有时候会发现图片有点变形,但是拍的照片木有问题,经过好长时间的研究之后,终于找到了一个最适合的解决办法:

设置预览参数

List<Size> sizes = parameters.getSupportedPreviewSizes();

Size optimalSize = getOptimalPreviewSize(sizes,
                                getResources().getDisplayMetrics().widthPixels,
                                getResources().getDisplayMetrics().heightPixels);
                    parameters.setPreviewSize(optimalSize.width,optimalSize.height);

camera.setParameters(parameters);

通过各种计算,获取最佳预览size

private Camera.Size getOptimalPreviewSize(List<Camera.Size> sizes, int w,int h) {
        final double ASPECT_TOLERANCE = 0.1;
        double targetRatio = (double) h / w;

        if (sizes == null)
            return null;

        Camera.Size optimalSize = null;
        double minDiff = Double.MAX_VALUE;

        int targetHeight = h;

        for (Camera.Size size : sizes) {
            double ratio = (double) size.width / size.height;
            if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE)
                continue;
            if (Math.abs(size.height - targetHeight) < minDiff) {
                optimalSize = size;
                minDiff = Math.abs(size.height - targetHeight);
            }
        }

        if (optimalSize == null) {
            minDiff = Double.MAX_VALUE;
            for (Camera.Size size : sizes) {
                if (Math.abs(size.height - targetHeight) < minDiff) {
                    optimalSize = size;
                    minDiff = Math.abs(size.height - targetHeight);
                }
            }
        }
        return optimalSize;
    }

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