如何在自定义的Android相机应用中只允许特定的比例拍照？

// 获取相机参数
Camera.Parameters parameters = camera.getParameters();

// 获取相机支持的所有照片尺寸选项
List<Camera.Size> supportedSizes = parameters.getSupportedPictureSizes();

// 设置的特定比例
float targetRatio = 4f / 3f;

// 找到与所需比例最接近的尺寸
Camera.Size bestSize = null;
float minDiff = Float.MAX_VALUE;

for (Camera.Size size : supportedSizes) {
    float ratio = (float) size.width / size.height;
    float diff = Math.abs(ratio - targetRatio);

    if (diff < minDiff) {
        minDiff = diff;
        bestSize = size;
    }
}

// 将最接近的尺寸设置给相机
if (bestSize != null) {
    parameters.setPictureSize(bestSize.width, bestSize.height);
    camera.setParameters(parameters);
}