http://bit.ly/2IyN9lP

How to get App Bar Layout Status Android

class Constant {     companion object { const val AppStateExpanded = "EXPANDED" const val AppStateCollapsed = "COLLAPSED" const val AppStateIdle = "IDLE" } } private var mCurrentState = Constant.AppStateIdle appbar_event_detail.addOnOffsetChangedListener(AppBarLayout.OnOffsetChangedListener { _, state ->     if (state == 0) {         mCurrentState = Constant.AppStateExpanded     } else if (abs(state) >= appbar_event_detail.totalScrollRange) {         mCurrentState = Constant.AppStateCollapsed     } else {         mCurrentState = Constant.AppStateIdle     } })

https://ift.tt/2FQgXJw

kotlin code format setting in android studio 

   if you want kotlin code format like java then you got the right place.

   go to file -> settings -> code style -> kotlin 

   and check and unchecked box given below images 

   Setting image part 1

    Setting image part 2