You can set language selection to another activity. When user selects a new language, you can reload the main activity, and in activity_create redefine your menus.
Sir,
Thanks for your reply. In fact I did it in the same way as your suggestion:
In config activity, after user updated settings, he clicked a OK button,
......
Activity.Finish
StartActivity(Main)
end sub
Now, main activity will run the Activity_Resume sub but not Activity_Create sub. So, no way to redefine menu. And, even it goes to Activity_Create sub I am not sure if could redefine menu because there does not exist activity.removemenuitem.