How to auto import the necessary classes in Android Studio with shortcut?

Question

I\'ve just switch to Android Studio 0.5.1, and the things going so slow here, because nothing works in the regular way...

How do I import the necessary classes with

Answer 1

On my Mac Auto import option was not showing it was initially hidden

Android studio ->Preferences->editor->General->Auto Import

and then typed in searched field auto then auto import option appeared. And now auto import option is now always shown as default in Editor->General. hopefully this option will also help others. See attached screenshot