Android ConstraintLayout 小记
* 可以圆形定位view之间的位置,通过View的中心,来定位不同半径和弧度的距离。
layout_constraintCircle
: references another widget idlayout_constraintCircleRadius
: the distance to the other widget centerlayout_constraintCircleAngle
: which angle the widget should be at (in degrees, from 0 to 360)
![](https://developer.android.com/reference/android/support/constraint/resources/images/circle1.png)
![](https://developer.android.com/reference/android/support/constraint/resources/images/circle2.png)
* 子view的Gone实际没有被remove,还在,只是大小是0
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