Android studio 3.4.2 unresolved reference android.os.Bundle

Question

When I create a new android project in android studio 3.4.2, the gradle build without error and runs successfully. But Android Studio shows 4 errors.

1. Unresolved reference android.os.Bundle
2. onCreate 'overrides' nothing
3. super.onCreate , Cannot access class 'android.os.Bundle'. Check your module classpath for missing or conflicting dependencies

Answer 1

My IDE autocomplete in xml files is not working too, so when I scour SO, I got one link that solves my problems. Here is the link Android Studio - XML Editor autocomplete not working with support libraries

Answer 2

I was able to resolve this by following these steps:

1. Delete the .idea folder
2. File -> Invalidate caches and restart.