📄 基于nokia手机的移动游戏开发(3).htm
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<DIV style="FONT-SIZE: 18pt; COLOR: #990000; FONT-FAMILY: 楷体_GB2312"
align=center><B>Java手机游戏开发实例</B></DIV><BR>
<DIV style="FONT-SIZE: 18px; COLOR: #990000; FONT-FAMILY: ; 宋体: "
align=center>基于Nokia手机的移动游戏开发(3)</DIV>
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<P><SPAN
class=f14> <STRONG>二、实现游戏的步骤</STRONG><BR><BR> 下图显示的是一个游戏MIDlet在成功安装和运行之后用户界面状态的典型的变化流程。我们想通过一个游戏者的视角来阐述开发移动游戏的过程。<BR></SPAN></P><SPAN
class=f14>
<P align=center><BR><IMG src="基于Nokia手机的移动游戏开发(3).files/1101782010-1.jpg"
align=baseline border=0><BR>图3 用户界面状态图表<BR></P>
<P><BR> 1
开始游戏<BR><BR> 在用户启动MIDlet之后，将显示游戏特定的闪动屏幕。闪动屏幕是FullCanvas的一个实例。它可用于显示一个公司的标志或者用动画形式介绍游戏。除了End键以外的所有键盘事件（MIDlet可用的）都可以跳过闪动屏幕并显示主菜单。还应该设置一个时间限定，能够在一定的时间过后自动跳出闪动屏幕进入游戏屏幕。<BR>GameMIDlet类是游戏的基本类；它处理MIDlet的生命周期并且处理游戏显示。下面的代码是闪动屏幕和游戏MIDlet类的构架。<BR><BR></P>
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<TD>//Skeleton for the base class of game<BR>import
javax.microedition.midlet.*;<BR>import
javax.microedition.lcdui.*;<BR>public class GameMIDlet extends
MIDlet {<BR> private Display display = null;<BR> //Splash screen
that starts the application<BR> private SplashFullCanvas
splash;<BR> public GameMIDlet() {<BR> splash = new
SplashFullCanvas(this);<BR> }<BR> protected void startApp() throws
MIDletStateChangeException {<BR> if (display == null)
{<BR> display = Display.getDisplay(this);<BR> }<BR> //splash
screen to the
display<BR> setDisplayable(splash);<BR> }<BR> protected void
pauseApp() {<BR>}<BR><BR> protected void destroyApp(boolean
p0)<BR> throws MIDletStateChangeException {<BR> }<BR><BR> public
void setDisplayable(Displayable dl)
{<BR> display.setCurrent(dl);<BR> }<BR>}<BR><BR>//Skeleton for the
splash screen in Nokia Java Game<BR>import
javax.microedition.lcdui.*;<BR>import java.util.Timer;<BR>import
java.util.TimerTask;<BR>import com.nokia.mid.ui.*;<BR><BR>public
class SplashFullCanvas extends FullCanvas {<BR> private GameMIDlet
parent = null;<BR> private MainMenu menu = null;<BR> private Timer
timer = null;<BR> public SplashFullCanvas(GameMIDlet parent)
{<BR> this.parent = parent;<BR> menu = new
MainMenu(<BR> Resources.getString(Resources.ID_GAME_NAME),<BR> List.IMPLICIT,
parent);<BR> startTimer();<BR> }<BR>protected void paint(Graphics
g) {<BR> //Do the splash screen here<BR>}<BR>protected void
keyPressed(int keyCode) {<BR> timer.cancel();<BR> timer =
null;<BR> //All key events received set the main menu to the
screen<BR> parent.setDisplayable(menu);<BR>}<BR><BR>//Timer for the
splash screen. Main menu is set to the display<BR>//after 5
seconds.<BR>private void startTimer() {<BR> TimerTask task =new
TimerTask() {<BR> public void run()
{<BR> parent.setDisplayable(menu);<BR> }<BR> };<BR> timer = new
Timer();<BR> timer.schedule(task,
5000);<BR>}<BR>}</TD></TR></TBODY></TABLE><BR> 2
主菜单（MainMenu）屏幕<BR><BR> 主菜单是包含游戏特定选项的固有目录（"Continue"、"New
game"、"Options"、"High scores"、"Instructions"、"About"和"Exit
game"）。"Continue"只有在游戏被暂停的时候才能被显示。当"Continue"显示的时候，它必须是目录列表的第一个元素。主菜单的标题必须是游戏的名称。下面的代码是主菜单的框架。<BR><BR>
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<TD>//Skeleton for the main menu<BR>import
javax.microedition.lcdui.*;<BR>public class MainMenu extends List
implements CommandListener {<BR> private GameMIDlet parent =
null;<BR> private GameFullCanvas game = null;<BR> public
MainMenu(String p0, int p1, String[] p2, Image[] p3,<BR> GameMIDlet
parent) {<BR> super(p0, p1, p2,
p3);<BR> init(parent);<BR> }<BR> public MainMenu(String p0, int p1,
GameMIDlet parent) {<BR> super(p0,
p1);<BR> init(parent);<BR> }<BR> public void init(GameMIDlet
parent) {<BR> this.parent =
parent;<BR> this.setCommandListener(this);<BR> //if game paused
then "Continue" should be available in<BR> //selection list<BR> if
(game != null && game.isPaused())
{<BR> if(!(this.getString(0).equals(<BR> new
String(Resources.getString(<BR> Resources.ID_GAME_CONTINUE)))))
{<BR> this.insert(0,<BR> Resources.getString(Resources.ID_GAME_CONTINUE),<BR> null);<BR> }<BR> this.setSelectedIndex(0,true);<BR> }<BR> else
{<BR> //These must be with or without
icons<BR> this.append(Resources.getString(Resources.ID_GAME_NEW),
null);<BR> this.append(Resources.getString(Resources.ID_GAME_OPTIONS),null);<BR> this.append(Resources.getString(<BR> Resources.ID_GAME_HIGHSCORES),
null);<BR> this.append(Resources.getString(<BR> Resources.ID_GAME_INSTRUCTIONS),
null);<BR> this.append(Resources.getString(Resources.ID_GAME_ABOUT),
null);<BR> this.append(Resources.getString(Resources.ID_GAME_EXIT),
null);<BR> }<BR> }<BR> public void commandAction(Command p0,
Displayable p1) {<BR> List lis = (List) p1;<BR> String selected
=<BR> lis.getString(lis.getSelectedIndex());<BR> if
(selected.equals(Resources.getString(Resources.ID_GAME_NEW)))
{<BR> game = new GameFullCanvas(parent,
this);<BR> parent.setDisplayable(game);<BR> }<BR> else if
(selected.equals(<BR> Resources.getString(Resources.ID_GAME_OPTIONS)))
{<BR> parent.setDisplayable(<BR> new
OptionList(Resources.getString(Resources.ID_GAME_OPTIONS),<BR> List.IMPLICIT,<BR> parent,
this));<BR> }<BR> else if
(selected.equals(<BR> Resources.getString(Resources.ID_GAME_HIGHSCORES)))
{<BR> parent.setDisplayable(new HighScore(parent,
this));<BR> }<BR> else if
(selected.equals(<BR> Resources.getString(Resources.ID_GAME_INSTRUCTIONS)))
{<BR> parent.setDisplayable(<BR> new
Instructions(<BR> Resources.getString(Resources.ID_GAME_INSTRUCTIONS),parent,this));<BR> }<BR> else
if
(selected.equals(<BR> Resources.getString(Resources.ID_GAME_ABOUT)))
{<BR> parent.setDisplayable(<BR> new
About(<BR> Resources.getString(Resources.ID_GAME_ABOUT),<BR> parent,<BR> this));<BR> }<BR> else
if
(selected.equals(<BR> Resources.getString(Resources.ID_GAME_EXIT)))
{<BR> parent.notifyDestroyed();<BR> }<BR> else if
(selected.equals(<BR> Resources.getString(Resources.ID_GAME_CONTINUE)))
{<BR> if (game != null)
{<BR> game.gameContinue();<BR> parent.setDisplayable(game);<BR> }<BR> }<BR> }<BR>}</TD></TR></TBODY></TABLE></SPAN><BR><BR></DIV></TD></TR>
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