Cannot resolve symbol Theme, ThemeOverlay

Question

I updated my android studio to latest version - 3.0.1. Since then it complains \'Cannot resolve symbol\' for Theme and ThemeOverlay in the following lines of code. App runs

Answer 1

I had this same error so i compared it to gradle file of another project which wasn't showing error. In your build.gradle(Module:app) under dependencies, add the following line:

implementation 'com.android.support:preference-v7:28.0.0'