use enum in customview in android
inline fun <reified T : Enum<T>> TypedArray.getEnum(index: Int, default: T) =
getInt(index, -1).let { if (it >= 0) enumValues<T>()[it] else default
}
val a: TypedArray = obtainStyledAttributes(...)
val yourEnum: YourEnum = a.getEnum(R.styleable.YourView_someAttr, YourEnum.DEFAULT)
a.recycle()