如何在xamarin android中隐藏抽屉图标和菜单项

Question

我正在开发 Xamarin Android应用程序。我有三个片段，其中一个是BaseFragment。我把Toolbar和Drawerview放在基本片段中。现在，当我转到下一个片段时，我想更改菜单项并想要隐藏抽屉图标。如何做到这一点，任何想法？

我已尝试SetDisplayHomeAsUpEnabled(false)，SetHomeButtonEnabled(false)和SetDisplayShowHomeEnabled(false)隐藏抽屉图标，但它没有效果。

        public abstract class BaseFragment : MvxFragment
{
    private Toolbar _toolbar;
    private MvxActionBarDrawerToggle _drawerToggle;

    public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        var ignore = base.OnCreateView(inflater, container, savedInstanceState);

        var view = this.BindingInflate(FragmentId, null);

        _toolbar = view.FindViewById<Toolbar>(Resource.Id.toolbar);
        if (_toolbar != null)
        {
            ((MainActivity)Activity).SetSupportActionBar(_toolbar);
            ((MainActivity)Activity).SupportActionBar.SetDisplayHomeAsUpEnabled(false);

            _drawerToggle = new MvxActionBarDrawerToggle(
                Activity,                               // host Activity
                ((MainActivity)Activity).DrawerLayout,  // DrawerLayout object
                _toolbar,                               // nav drawer icon to replace 'Up' caret
                Resource.String.drawer_open,            // "open drawer" description
                Resource.String.drawer_close            // "close drawer" description
            );

            ((MainActivity)Activity).DrawerLayout.SetDrawerListener(_drawerToggle);
        }
        return view;
    }

    protected abstract int FragmentId { get; }