因为很重要所以先上官方连结：
http://tools.android.com/recent
https://developer.android.com/sdk/installing/index.html?pkg=studio
https://developer.android.com/sdk/index.html
More about Android Studio：
If you have been using Eclipse with ADT,
be aware that Android Studio is now the official IDE for Android,
so you should migrate to Android Studio in order to continue to receive all
the latest IDE updates. For help moving projects, see Migrating to
Android Studio.
如果你还在用ADT,请注意AS已经成为Android 官方IDE,您应该改用AS以取得最新的
IDE更新
小道消息：
http://ppt.cc/eDKu
ADT with Eclipse is still available, but is no longer considered to be in
active development.