settings.java

孤单惊魂

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class Settings
    extends Form implements CommandListener, ItemStateListener {
  private static Displayable instance;
  synchronized public static Displayable getInstance() {
    if (instance == null) {
      instance = new Settings();
    }
    return instance;
  }

  public static int difficulty = 0;
  public static boolean volume1 = true;
  private ChoiceGroup cg1 = new ChoiceGroup("难度设定:", Choice.EXCLUSIVE);
  private ChoiceGroup cg2 = new ChoiceGroup("音量设定:", Choice.EXCLUSIVE);
  private Image image = null;
  public Settings() {
    super("游戏设定");
    cg1.append("简单", image);
    cg1.append("普通", image);
    cg1.append("恶梦", image);
    append(cg1);
    append(cg2);
    cg2.append("音量开", image);
    cg2.append("音量关", image);
    setItemStateListener(this);
    addCommand(new Command("返回", Command.BACK, 1));
    setCommandListener(this);
  }

  public void itemStateChanged(Item item) {
    String label = item.getLabel();
    if (label.equals("难度设定:")) {
      difficulty = cg1.getSelectedIndex();
    }
    else if (label.equals("音量设定:")) {
      int i = cg2.getSelectedIndex();
      if (i == 0) {
        volume1 = true;
      }
      else {
        volume1 = false;
      }
    }
  }

  public void commandAction(Command c, Displayable s) {
    Navigator.flow(c.getLabel());
  }
}