failed to get the required ADT version number from the sdk
解决方法：
eclipse 和 android studio 工具不能同时共用同一个sdk，若共用同一个sdk, eclipse会报错，重新搞一个sdk供Eclipse使用
failed to get the required adt version from sdkversion
Eclipse failed to get the required ADT version number from the sdk
原文：http://www.cnblogs.com/onelikeone/p/7567472.html