The easiest way of adding menu items (to specify the options menu for an activity)...

override fun onCreateOptionsMenu(menu: Menu): Boolean { menuInflater.inflate(R.menu.menu_main, menu)

return true

}

override fun onOptionsItemSelected(item: MenuItem): Boolean {

menuInflater.inflate(R.menu.menu_main, menu) return super.onOptionsItemSelected(item)

}

override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.menu.menu_main)

}