<Android Studio unresolved reference. Project comp...

# stackoverflow

[user]

Android Studio unresolved reference. Project compiles
After upgrading Android Studio, a project with no issues started showing issues in the editor. I have lots of Unresolved Reference errors. Anything under the support libraries (support-v4, support-v7).

https://i.stack.imgur.com/WQna0.png▾

In the screen capture above, anything showing in red isn't resolving and showing as an error.
I am also using Lifecycle components and Room database. They seem to have issues as well. Looks like interfaces can be...