Auto import not working for Android classes in Android studio

Question

I am working on a project in Android studio. Suddenly, auto import stopped working in android studio for Android classes, like Android.widgets.Textview, etc. In my settings,

Answer 1

For me the reason was that the class I tried to create did not have an explicit public keyword, which made the class private by default, so it didn't show up in the import context menu of android studio.