java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams cannot be cast to android.w

souls0808

于 2023-08-18 14:48:51 发布

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文章标签： android

本文链接：https://blog.youkuaiyun.com/chengzhenjia/article/details/132361435

文章讲述了在调整Android布局组件左右边距时遇到的错误，通过将LinearLayout.LayoutParams替换为ViewGroup.MarginLayoutParams来解决问题。重点在于理解这两种LayoutParams的区别和适用场景。

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报错日志：

报错代码：

场景：调整左右边距时报错

 LinearLayout.LayoutParams lp =
                        (LinearLayout.LayoutParams) lightNavStartNavFocusArea.getLayoutParams();
                lp.leftMargin = leftMargin;
                lightNavStartNavFocusArea.setLayoutParams(lp);

解决方法：使用ViewGroup.MarginLayoutParams 代替 LinearLayout.LayoutParams

ViewGroup.MarginLayoutParams lp =
                        (ViewGroup.MarginLayoutParams) lightNavStartNavFocusArea.getLayoutParams();
                lp.leftMargin = leftMargin;
                lightNavStartNavFocusArea.setLayoutParams(lp);