Android Studio code style tool is already enabled by default for Kotlin enabled projects(as can be seen @Android Studio -> Preferences -> Editor -> Code Style -> Kotlin) and highlights errors as warning in light yellow color. We can enable disable check here just by unchecking the checkbox.
FOr Ktlint we have to follow steps given in Usage section of @
https://github.com/shyiko/ktlint and this has to be executed manually(as against AS which runs automatically) by some command which is for example : "gradle ktlint" for gradle.
so both works simultaneously