Access to global variable in menu XML file in Android

I'm creating an app in which an user must connect himself. I'm trying to implement a menu, in which the first item text would be the name of the connected user and once clicked on, it would bring to the user profile. To store the connected user information, I created my own subclass of android.app.Application, which contains, amongst others, the connected user:

private User currUser;

public User getCurrUser() {
    return this.currUser;
}

public void setCurrUser(User currUser) {
    this.currUser = currUser;
}

I was wondering how can I access to this global variable, in my menu XML file, so that the title of the first item would be the connected user name? Logically, I would do something like that:

<item android:id="@+id/action_profil" android:title=(MyApp)this.getApplication().getCurrUser().getM_UserName()
    android:orderInCategory="100" app:showAsAction="never" />

But I know this is not doable in XML. How would I do this? Perhaps, I should re-title the item somewhere else?

Thanks.