Android Studio rendering problems

Change your android version on your designer preview into your current version depend on your Manifest. rendering problem caused your designer preview used higher API level than your current android API level.

Adjust with your current API Level. If the API level isn't in the list, you'll need to install it via the SDK Manager.

In new update android studio 2.2 facing rendering issue then follow this steps.

I fixed it - in styles.xml file I changed

"Theme.AppCompat.Light.DarkActionBar"

to

"Base.Theme.AppCompat.Light.DarkActionBar"

It's some kind of hack I came across a long time ago to solve similar rendering problems in previous Android Studio versions.