目了，因为那些选项已经由Games菜单提供了。
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import javax.microedition.lcdui.*;
public class OptionList extends List implements CommandListener {
private GameMIDlet parent = null;
private MainMenu menu = null;
private KeyDefinitions def = null;
private Command back = new Command("", Command.BACK, 2);
public OptionList(String p0, int p1, String[] p2, Image[] p3,
GameMIDlet parent, MainMenu menu) {
super(p0, p1, p2, p3);
this.menu = menu;
init(parent);
}
public OptionList(String p0, int p1, GameMIDlet parent,
MainMenu menu) {
super(p0, p1);
this.menu = menu;
init(parent);
}
private void init(GameMIDlet parent) {
this.parent = parent;
this.addCommand(back);
this.setCommandListener(this);
//These are just a examples for the game specific options
this.append(Resources.getString(Resources.ID_GAME_LEVEL),
null);
this.append(Resources.getString(Resources.ID_GAME_SOUNDS),
null);
this.append(Resources.getString(Resources.ID_GAME_VIBRA),
null);
}
public void commandAction(Command p0, Displayable p1) {
if (p0 == back) {
parent.setDisplayable(menu);
}
else {
List lis = (List) p1;
int idx = lis.getSelectedIndex();
switch (idx) {
case 0:
//TODO
break;
case 1:
//TODO
break;
case 2:
//TODO
break;
case 3:
parent.setDisplayable(def);
break;
//More if needed
default:
break;
}
}
}
} |
5 高分屏幕
当用户从主菜单中选择"High scores"选项的时候，高分就会显示出来。高分是显示在全屏画布（FullCanvas）实例上的。分数应该在一个屏幕上就显示完，而不要卷动页面，因为这样会给用户带来麻烦。
当然了，高分屏幕也可能会包含一些图片或者动画。用户应该能够通过按下左功能键、右功能键、数字键或者Send键返回主菜单。这个例子不提供任何处理高分的机制。处理高分的两种典型的方法是通过使用记录管理服务（RMS）永久保存分数或者通过HTTP连接把高分保存到服务器中。下面的代码是高分的框架。
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import javax.microedition.lcdui.*;
import com.nokia.mid.ui.*;
public class HighScore extends FullCanvas {
private GameMIDlet parent = null;
private MainMenu menu = null;
public HighScore(GameMIDlet parent, MainMenu menu) {
this.parent = parent;
this.menu = menu;
}
protected void paint(Graphics g) {
//Paint the high scores here
}
public void keyPressed(int keyCode) {
if (keyCode != KEY_END) {
//selection list to the screen
parent.setDisplayable(menu);
}
}
} |
6 教学屏幕
当用户从主菜单中选择"Instructions"条目的时候，就会显示出游戏的规则。游戏规则文本放置在Form实例中。Form中应该包含用于进入下一条教学规则的命令（例如，标签"More"）和回到主菜单的命令（例如，标签"Back"）。"More"一般由左功能键控制，而"Back"由右功能键控制。如果教学规则里包含动画，那么这些动画应该使用全屏画布（FullCanvas）来显示。按下左功能键将跳过动画进入下一个教学屏幕。按下右功能键，用户将从动画中回到主菜单。键End将结束应用程序。下面的代码是文字教学规则和动画的框架。
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//Text instructions. Text can be written in constructor or in own
method.
//Developer should remember that also instruction texts should be
//internationalized
import javax.microedition.lcdui.*;
public class Instructions extends Form implements CommandListener {
//Command for going next instruction if needed
private Command more = new Command(
Resources.getString(Resources.ID_GAME_MORE),
Command.OK, 1);
//Command for going back to the main menu
private Command back = new Command("", Command.BACK, 2);
private GameMIDlet parent = null;
private MainMenu menu = null;
public Instructions(String title, GameMIDlet parent, MainMenu
menu) {
super(title);
this.parent = parent;
this.menu = menu;
this.addCommand(back);
this.addCommand(more);
this.setCommandListener(this);
}
public void commandAction(Command p0, Displayable p1) {
if (p0 == more) {
//go to the next if needed e.g animation
parent.setDisplayable(new InstructionAnimation(parent));
}
else if (p0 == back) {
parent.setDisplayable(menu);
}
}
}
//Instruction animation
import javax.microedition.lcdui.*;
import com.nokia.mid.ui.*;
public class InstructionAnimation extends FullCanvas {
private GameMIDlet parent = null;
public InstructionAnimation(GameMIDlet parent) {
this.parent = parent;
}
protected void paint(Graphics g) {
//Do the animation here
}
public void keyPressed(int keyCode) {
if (keyCode == KEY_SOFTKEY1) {
//go to the next instruction screen if needed
}
else if (keyCode == KEY_SOFTKEY2) {
//selection list to the screen
parent.setDisplayable(new MainMenu(
Resources.getString (
Resources.ID_GAME_NAME),
List.IMPLICIT, parent));
}
}
} |
7关于（About）屏幕
关于（About）屏幕显示游戏制作公司的消息文本或标志。当用户从主菜单中选择"About"选项的时候，就会启动这个屏幕。和教学规则页面一样，关于屏幕页面如果只需要文本信息的话，那么可以使用Form来实现。如果需要图像或动画，那么应该使用Canvas或FullCanvas。
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//Text "About" code skeleton
import javax.microedition.lcdui.*;
public class About extends Form implements CommandListener {
//Command for going back to the main menu
private Command back = new Command("", Command.BACK, 1);
private GameMIDlet parent = null;
private MainMenu menu = null;
public About(String title, GameMIDlet parent, MainMenu menu) {
super(title);
this.parent = parent;
this.menu = menu;
this.addCommand(back);
this.setCommandListener(this);
}
public void commandAction(Command p0, Displayable p1) {
if (p0 == back) {
parent.setDisplayable(menu);
}
}
} |
