问题
Why I could not find android support library in my extras folder? What should I do? I'm using Eclipse Juno.
回答1:
The Android Support Library entry in the SDK Manager has been deprecated - its last release was version 23.1 of the Support Library (now 8 releases ago).
You can still find it if you check the Obsolete checkbox, but with no modern version, you'll be unable to use any newly introduced APIs or get any bug fixes.
If you wish to use the latest version the Android Support Library, stop using Eclipse (it has been deprecated for over a year), switch to Android Studio, and use the Android Support Repository from the SDK Manager.
来源：https://stackoverflow.com/questions/38732843/missing-android-support-library-in-extras-folder-sdk-manager