【Android】Error:java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0

ref:
http://stackoverflow.com/a/36027375

resolve this by downgrading buildToolsVersion in app gradle setting: changing this line:

buildToolsVersion "24.0.0 rc1"

to

buildToolsVersion "23.0.2"