Change textView from another XML : I my Android APP, i have somes `XML`, i want to modify a `textView`, but he is not in the primary `XML` fixe for this `activity`.

I've try :

    TextView nav_playerid = (TextView) findViewById(R.id.nav_username);
            nav_playerid.setText(id_joueur_connect);

But that's don't work. How i can tell to the app to get this specific XML File and modify this `textView`?

Thanks