参考博文：

(3条消息) Android 代码动态设置margin（报错：ViewGroup$MarginLayoutParams cannot be cast to android.widget.LinearLayout）_Kodulf的专栏-CSDN博客_viewgroup动态设置margin

错误代码

 正确代码

 val params: LayoutParams = child.layoutParams
        //获取view的margin设置参数
        val marginParams: CMarginLayoutParams = if (params is CMarginLayoutParams) {
            params
        } else { CMarginLayoutParams(params) }