Resolve the ADT 20 problem android support library

this template depends on the android support library,which is either not installed,or the template depends on a more recent version than
the one you have installed.

Required version :8

I clicked install for installation, but console shows Installed Android Support Library, revision 9. And new 1 project still prompt above information, how to return a responsibility excuse me?

Close eclipse and end the adb.exe process
After entering \extras\android, there is no support folder but there is an compatibility folder. Create a new support folder and copy the contents of compatibility into support. Create a new project OK.