Android studio 3.1 XML preview not showing for some XML layouts

Question

Some layouts are shown, some just have blank, gray frame. I can\'t seem to find a correlation between XML layouts that work and those that do not, there is a mixture of use

Answer 1

I've tried pretty much everything from above and nothing worked for me. Then I've downgraded my compileSdkVersion and targetSdkVersion

compileSdkVersion 27
targetSdkVersion 27

It worked! I've changed the versions back to 28 and it is still working.