Just adding to what was already said.
Put the textview in the qolscore_layout. Then you can modify it's content like this:
qolscorelayout = inflater.inflate(R.layout.qolscore_dialog, (ViewGroup)findViewById(R.id.qolscore_dialog_root_element));
final TextView scoretext = (TextView) qolscorelayout.findViewById(R.id.scoretext);
scoretext.setText("" + todayScore); //NEW