private int focused_tile = 0;
public SymbolSelectionScreen() {
super(Field.USE_ALL_HEIGHT | Field.USE_ALL_WIDTH);
GameState game_state = GameState.getInstance();
game_state.setGame_over(false);
uiconfig = UiConfigFactory.getUiConfig(Display.getWidth(), Display.getHeight());
Bitmap nought_unfocused = BitmapFactory.getNoughtUnfocused();
Bitmap nought_focused = BitmapFactory.addStateIndicator(nought_unfocused, Constants.FOCUSED_COLOUR);
Bitmap nought_clicked = BitmapFactory.addStateIndicator(nought_unfocused, Constants.CLICKED_COLOUR);