Answer Happy

The easiest way of adding menu items (to specify the options menu for an activity) is inflating an XML file into the Menu via MenuInflater. With menu_main.xml we can do it in this way:

A. override fun onCreateOptionsMenu(menu: Menu): Boolean { menuInflater.inflate(R.menu.menu_main, menu) return true }
B. override fun onOptionsItemSelected(item: MenuItem): Boolean { menuInflater.inflate(R.menu.menu_main, menu) return super.onOptionsItemSelected(item) }
C. override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.menu.menu_main) }