出现这种情况大多是继承自layout。在构造方法中添加 setWillNotDraw 问题解决。
相关解释如下
If this view doesn't do any drawing on its own, set this flag to allow further optimizations. By default, this flag is not set on View, but
could be set on some View subclasses such as ViewGroup. Typically, if you override onDraw(Canvas) you should clear this flag.