http://developer.android.com/sdk/installing/studio.html > Caution: Android Studio is currently available as an early access preview. > Several features are either incomplete or not yet implemented and you may encounter bugs. > If you are not comfortable using an unfinished product, > you may want to instead download (or continue to use) the ADT Bundle (Eclipse with the ADT Plugin). 別に使うなとは言ってないな 不完全で未実装でバグがあるだろうから嫌ならeclipseの方がいいよってだけ