can't resolve AppCompatActivity

Question

After renaming application package name, Android Studio displayed this error can\'t resolve symbol AppCompatActivity

Things I tried: <

Answer 1

This working for me, on macOS:

go to, Android Studio -> Preferences -> Appearance & Behavior -> System Settings -> Android SDK -> SDK Platforms And download Android SDK Platform XX and Sources for Android XX. Where XX es the value of compileSdkVersion on your gradle (Module:app)

on Windows the route is: File -> Settings... -> Appearance & Behavior -> System Settings -> Android SDK -> SDK Platforms