communicate activity with fragment

activity.kt

fun sendToFragment(message: String) {
        FooFragment.foo(message, fooFragmentInstance as FooFragment)
    }

fragment.kt

class FooFragment : Fragment() {

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    }
    fun foo(message: String){
    }
    companion object {
        fun foo(message: String, fooFragment: FooFragment){
            fooFragment.fooFun(message)
        }
    }
}