Android MenuProvider not working inside Fragment

Question

I need to add a menu depending on the fragment the user is looking at.

I tried to use the new MenuProvider in the onViewCreated-Method of my Fragment:

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    val menuHost: MenuHost = requireActivity()

    menuHost.addMenuProvider(object : MenuProvider {
        override fun onCreateMenu(menu: Menu, menuInflater: MenuInflater) {
            menuInflater.inflate(R.menu.menu_main, menu)
        }

        override fun onMenuItemSelected(menuItem: MenuItem): Boolean {
            return true
        }
    }
}

This doesn't do anything with my Toolbar in the Main-activity. Do I have to enable menus somewhere?

Edit 1 As I saw in an answer to a similar problem, putting this into my MainActivity didn't do the trick:

override fun onCreateOptionsMenu(menu: Menu?): Boolean {
    return true
}

Edit 2 Moving my menu item into a group didn't fix it either.

Edit 3 I put a breakpoint at menuInflater.inflate() but it wasn't activated, which tells me, the activity does not care about the menu provider.

Answer 1

I missed a setSupportActionBar(findViewById(R.id.toolbar)) in the onCreate of my MainActivity