tracks.java

一个非常好的赛车游戏代码

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

public class Tracks extends List
    implements CommandListener
{
  private MIDlet midlet;
  private GameCanvas nextForm;
  private Form previousForm;

  private Command backCommand = new
      Command("Back", Command.SCREEN, 1);

  private static String trackNames[] =
      {"City", "Forest", "Mountain"};

  private static int lengths[] =
      {500, 800, 1400};

  private static int speeds[] =
      { 2, 3, 4};

  public Tracks(MIDlet midlet, GameCanvas nextForm,
      Form previousForm)
  {
    super("Tracks:", List.IMPLICIT, trackNames, null);
    this.midlet = midlet;
    this.nextForm = nextForm;
    this.previousForm = previousForm;
    addCommand(backCommand);
    setCommandListener(this);
  }

  public void commandAction(Command c, Displayable s)
  {
    if (c.equals(List.SELECT_COMMAND))
    {
      int trackID = getSelectedIndex();
      // Set the length based on the track
      nextForm.setLength(lengths[trackID]);
      // Set the speed based on the track
      nextForm.setSpeed(Float.createFloat(speeds[trackID]));
      nextForm.initEnemies();
      nextForm.initPowerups();
      Display.getDisplay(midlet).setCurrent(nextForm);
      nextForm.start();
    }
    else if (c == backCommand)
    {
      Display.getDisplay(midlet).setCurrent(previousForm);
    }
  }
}