片段xamarin android中未调用OnOptionsItemSelected

Question

In OnCreate: SetHasOptionsMenu (true);

public override bool OnOptionsItemSelected(IMenuItem menu)
        {
            menu.SetChecked (true);
            switch (menu.ItemId) {
            case Resource.Id.selecta:
                Toast.MakeText (Application.Context, "Top", ToastLength.Long);

                return true;
            case Resource.Id.selectb:
                Toast.MakeText (Application.Context, "New", ToastLength.Long);

                return true;
            }
            return base.OnOptionsItemSelected (menu);

        }
        public override void OnCreateOptionsMenu(Android.Views.IMenu menu,MenuInflater inflater)
        {
            //MenuInflater.Inflate (Resource.Menu.Action_menu, menu);
            //menu.Clear();
            inflater.Inflate(Resource.Menu.Action_menu,menu);

            base.OnCreateOptionsMenu (menu,inflater);
        }

When the item of checkbox is checked . OnOptionsItemSelected is not called.

Answer 1

I guess you have a implementation of OnOptionsItemSelected in your Activity too.

Either remove it or return false if you want to give Fragment a chance to handle this event.

The Activity gets a chance to handle this event first. So onOptionsItemSelected() is called first on the Activity before the method is called for the fragment. Only if it is not handled by the Activity then the fragment has a chance to handle it.