override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    registerForContextMenu(listView)
}

override fun onCreateContextMenu(menu: ContextMenu, view: View,
                                 menuInfo: ContextMenu.ContextMenuInfo?) {
    activity!!.menuInflater.inflate(R.menu.context_menu, menu)
}

override fun onContextItemSelected(item: MenuItem): Boolean {
    val info = item.menuInfo as AdapterView.AdapterContextMenuInfo
    val index = info.position
    val view = info.targetView
    ...
}