android获取图片文件头信息

/**
     * 获取图片文件头信息
     * @param in
     * @return
     */
    public static BitmapFactory.Options getImageOptions(InputStream in) {
        BitmapFactory.Options opts = new BitmapFactory.Options();
        opts.inJustDecodeBounds = true;
  BitmapFactory.decodeStream(in, null, opts);
        return opts;
    }