Shadow on layout but not on it´s child views?

[mikaelelofsson]

Is it possible to only drop shadow on a layout, not having it set on it´s child views?

I want the shadow attached to a constraint layout, but not on an imagebutton that is in the layout.

[wenmin92]

just set background will fix this. 这个库的原理是：复制一遍绘制的内容，将内容的颜色成分去掉，保留alpha，然后使用模糊滤镜达到模拟阴影的效果。