I recently switched from Eclipse to Android Studio, and one of the most maddening things about the shift was figuring out how to automatically import dependencies - ctrl-shift-o (organize imports) in Eclipse.
The first result when you google it is some completely irrelevant answer on StackOverflow, so I'm writing this in the hope someone sees it.
It's alt-enter (Linux/Windows). Or option-return (Mac).
Speaking of which, wasn't "option-return" a hell of a lot easier to read than some random glyph Apple decided should mean option? Or is it alt? On my desktop keyboard (ISO layout) the key says alt and has some random glyph that looks a little like a bird at sunset. On my laptop keyboard (US layout) it says alt AND option. C'mon Apple, we already have standardized visual glyphs for conveying ideas. They're called letters, and you only need a few of them to convey a vast array of concepts.
To give credit where it's due, this is mentioned in passing at http://developer.android.com/training/basics/firstapp/starting-activity.html.