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

The problem was with android studio indexing.

Follow the steps..

Go to 'File' > 'Invalidate caches/restart'

Now the studio will shut down and restart. Now indexing begins. On completion of indexing you will find the Suggestion boxes with every possible suggestions.

Answer 2

For me, the problem was that "Show import popup" was not checked at File > Settings > Editor > General > Auto Import > Java.

Answer 3

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.