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

for android 3.1.3 I solved it by changing the dependencies

from

implementation 'com.android.support:appcompat-v7:28.0.0-rc02'

to

implementation 'com.android.support:appcompat-v7:28.0.0-alpha1'