What i am doing::
IntelliJ IDEA — If your project uses an external configuration (like a Maven pom.xml) then annotation processing should just work.
Follow these steps :
File
-> Other Settings
-> Default Settings
Compiler
-> Annotation Processors
Then Check Enable annotation processing
Reference -> Set up manual configuration for ButterKnife annotations
Update 30-6-2015
Follow These Steps for Intellij
IDEA 14.0 :
Open IDEA's preference: File
-> Settings
or click ctl + alt + s
Navigate to Build, Execution and deployment
-> Compiler
-> Annotation Processors
and Choose your project Then Check Enable annotation processing