问题
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, auto import is enabled. If I write import android.widget.textview, then TextView shows up in the auto import box.
回答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.
回答2:
For me, the problem was that "Show import popup" was not checked at File > Settings > Editor > General > Auto Import > Java.
回答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.
来源：https://stackoverflow.com/questions/24406225/auto-import-not-working-for-android-classes-in-android-studio