问题
It was easy with early ADT versions but now i can't find this function. This is official info http://developer.android.com/sdk/adding-components.html
回答1:
You can add a repo via Tools -> Manage Add-on Sites..., which can be found in the SDK-manager. You can start the manager by using Window -> Android SDK Manager from eclipse or by running the android application in your ANDROID_SDK/tools directory.
来源：https://stackoverflow.com/questions/8328449/how-to-add-add-on-repo-with-adt-15