[Android quick start documentation] followed to the letter while launcher and engine were not running. The only thing that was at all different from the documentation were some slight version differences (CodeWorks 1R5 instead of 1R4u1, etc.)
I’m having the same exact issue on windows and would like to see an answer. From what I’ve gatthered java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0
means that somewhere it’s looking for version 8 instead of 1.7. I don’t have any other version than 1.7 and all environment variables are all pointing to it as well as AndroidSDK settings just like yours.