E/libc: Access denied finding property “vendor.camera.aux.packagelist“

2023-05-16

输出台日志:E/libc: Access denied finding property “vendor.camera.aux.packagelist”
前提:1.app有各类权限
2.app代码无明显问题
3.常见于扫码
4.画面很模糊,或者说像素很低,扫码小概率扫不出来

代码如下:

        parameters.setPreviewSize(cameraResolution.x, cameraResolution.y);
        camera.setParameters(parameters);
        camera.setDisplayOrientation(90);

老的camera启动前设置参数,参数中的x和y得来的方式如下:
大概意思就是根据屏幕尺寸来计算的,遍历摄像头支持的所有分辨率,然后计算的:
笔者错误在于MAX_PREVIEW_PIXELS 这个值是老的 仅仅为800 * 1080 小于目前市面上的手机支持的屏幕像素 如p40为2340 × 1080
导致最终的的结果很小,以至于显示的就很模糊 但是未影响二维码解码

void initFromCameraParameters(Camera camera) {
        Camera.Parameters parameters = camera.getParameters();
        WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        Display display = manager.getDefaultDisplay();
        int width = display.getWidth();
        int height = display.getHeight();
        if (width < height) {
            int temp = width;
            width = height;
            height = temp;
        }

        screenResolution = new Point(width, height);
        cameraResolution = findBestPreviewSizeValue(parameters, screenResolution, false);
    }
    private static Point findBestPreviewSizeValue(Camera.Parameters parameters, Point screenResolution, boolean portrait) {

        Point bestSize = null;
        int diff = Integer.MAX_VALUE;
        for (Camera.Size supportedPreviewSize : parameters.getSupportedPreviewSizes()) {
            int pixels = supportedPreviewSize.height * supportedPreviewSize.width;
            if (pixels < MIN_PREVIEW_PIXELS || pixels > MAX_PREVIEW_PIXELS) {
                continue;
            }
            int supportedWidth = portrait ? supportedPreviewSize.height : supportedPreviewSize.width;
            int supportedHeight = portrait ? supportedPreviewSize.width : supportedPreviewSize.height;
            int newDiff = Math.abs(screenResolution.x * supportedHeight - supportedWidth * screenResolution.y);
            if (newDiff == 0) {
                bestSize = new Point(supportedWidth, supportedHeight);
                break;
            }
            if (newDiff < diff) {
                bestSize = new Point(supportedWidth, supportedHeight);
                diff = newDiff;
            }
        }
        if (bestSize == null) {
            Camera.Size defaultSize = parameters.getPreviewSize();
            bestSize = new Point(defaultSize.width, defaultSize.height);
        }
        return bestSize;
    }
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