ConstraintLayout之Infer Constraints(推断约束)

冷不防 2022-06-01 11:57 217阅读 0赞

在使用 ConstraintLayout 的时候，发现一个异常：

> This view is not constrained vertically: at runtime it will jump to the left unless you add a vertical constraint less… (Ctrl+F1)  
> The layout editor allows you to place widgets anywhere on the canvas, and it records the current position with designtime attributes (such as layout\_editor\_absoluteX.) These attributes are not applied at runtime, so if you push your layout on a device, the widgets may appear in a different location than shown in the editor. To fix this, make sure a widget has both horizontal and vertical constraints by dragging from the edge connections.

我仔细检查了约束条件，都是没有问题的，但是显示我缺少约束条件，编译后会将所有的控件堆在左上角，我选择了无视异常，但是异常没有无视我，编译后的效果类似于FarmeLayout没有添加位置约束一样的效果，后来查找百度，发现了解决方案：

> 1.切换xml到design试图下  
> 2.选中ConstraintLayout右键选择Constraint Layout中的Infer Constraints  
> ![引用块内容][SouthEast]

但是我将AndroidStudio的视图打开以后，仔细检查了，却没有发现上图的提示：  
![这里写图片描述][SouthEast 1]

最后我仔细检查了一遍，终于让我找到了：  
![这里写图片描述][SouthEast 2]

解决问题！

# 参考： #

[http://blog.csdn.net/u010296640/article/details/72922165][http_blog.csdn.net_u010296640_article_details_72922165]

[SouthEast]: /images/20220601/78858cfe97bc4378bb424b1c44d72d4f.png
[SouthEast 1]: /images/20220601/ff763ff138984e7bbeb1f9cda5245101.png
[SouthEast 2]: /images/20220601/f8bd94b89fe84c8f9980cc7e613d8dfb.png
[http_blog.csdn.net_u010296640_article_details_72922165]: http://blog.csdn.net/u010296640/article/details/72922165