AS4.1中ConstraintLayout中创建Button报错的解决办法

1. 在约束布局中添加Button控件后,发现xml飘红了!
   
   2)报错信息为:“This view is not constrained, it only has designtime positions, so it will jump to (0,0)…”,以下为解决方案路径.将Text视图切换到Design,位于正中间,点击一下类似魔法棒的工具(Infer Constraints)即可.如下图所示:
   
2. 点击Infer Constraints其实相当于在Button标签中添加如下两个属性:
   app:layout_constraintStart_toStartOf=“parent”
   app:layout_constraintTop_toTopOf=“parent”
   如下图所示: