SampleFragment.kt

class SampleFragment: Fragment() {

    data class Args(val title: String? = null, val content: String? = null, val showButton: Boolean = false)

    companion object {

        private const val ARG_TITLE = "ARG_TITLE"
        private const val ARG_CONTENT = "ARG_CONTENT"
        private const val ARG_SHOW_BUTTON = "ARG_SHOW_BUTTON"

        fun newInstance(args: Args) = SampleFragment().apply {
            arguments = getBundle(args)
        }

        fun getBundle(args: Args) = Bundle().apply {
            putString(ARG_TITLE, args.title)
            putString(ARG_CONTENT, args.content)
            putBoolean(ARG_SHOW_BUTTON, args.showButton)
        }
    }

    private val mArgs by lazy {
        arguments?.let {
            Args(
                arguments.getString(ARG_TITLE),
                arguments.getString(ARG_CONTENT),
                arguments.getBoolean(ARG_SHOW_BUTTON) == true)
        } ?: Args()
    }
}