如果你的 Android 11 中二维码显示模糊不清，有可能是因为缺少对 Camera2 API 的支持。要解决这个问题，你可以使用以下代码示例：

private void openCamera() {
    CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
    try {
        String cameraId = manager.getCameraIdList()[0];
        CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);

        StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
        if (map == null) {
            throw new RuntimeException("Cannot get available preview/video sizes");
        }
        Size largest = Collections.max(Arrays.asList(map.getOutputSizes(ImageFormat.JPEG)), new CompareSizesByArea());
        ImageReader reader = ImageReader.newInstance(largest.getWidth(), largest.getHeight(), ImageFormat.JPEG, /*maxImages*/ 2);
        reader.setOnImageAvailableListener(mOnImageAvailableListener, mBackgroundHandler);

        int displayRotation = getWindowManager().getDefaultDisplay().getRotation();
        mSensorOrientation = characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
        boolean swappedDimensions = false;
        switch (displayRotation) {
            case Surface.ROTATION_0:
            case Surface.ROTATION_180:
                if (mSensorOrientation == 90 || mSensorOrientation == 270) {
                    swappedDimensions = true;
                }
                break;
            case Surface.ROTATION_90:
            case Surface.ROTATION_270:
                if (mSensorOrientation == 0 || mSensorOrientation == 180) {
                    swappedDimensions = true;
                }
                break;
            default:
                Log.e(TAG, "Display rotation is invalid: " + displayRotation);
        }

        Point displaySize = new Point();
        getWindowManager().getDefaultDisplay().getSize(displaySize);
        int rotatedPreviewWidth = width;
        int rotatedPreviewHeight = height;
        int maxPreviewWidth = displaySize.x;
        int maxPreviewHeight = displaySize.y;

        if (swappedDimensions) {
            rotatedPreviewWidth = height;
            rotatedPreviewHeight = width;
            maxPreviewWidth = displaySize.y;
            maxPreviewHeight = displaySize.x;
        }
        if (maxPreviewWidth > MAX_PREVIEW_WIDTH) {
            maxPreviewWidth = MAX_PREVIEW_WIDTH;
        }
        if (maxPreviewHeight > MAX_PREVIEW_HEIGHT) {
            maxPreviewHeight = MAX_PREVIEW_HEIGHT;
        }
        Size previewSize = chooseOptimalSize(map.getOutputSizes(SurfaceTexture.class),
                rotatedPreviewWidth, rotatedPreviewHeight, maxPreviewWidth,
                maxPreviewHeight, largest);
        mPreviewSize = previewSize;

        int orientation = getResources().getConfiguration().orientation;
        if (orientation == Configuration.ORIENTATION