Android does not render a Mask at all

[lucksp]

Accidentally closed #241 and cannot reopen.

[0tii]

yea i can not get it to render any mask even with the exact example from the doc on android emulator

[Seottle]

是的，我也遇到这个问题，在部分安卓设备上也无法渲染任何遮罩。（华为mate 30)