📄 基于nokia手机的移动游戏开发(4).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(4)</DIV>
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style="PADDING-RIGHT: 10px; PADDING-LEFT: 10px; FONT-SIZE: 10.5pt; COLOR: black; LINE-HEIGHT: 180%"
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<P><SPAN class=f14> 3 游戏屏幕<BR><BR> 如果用户从主菜单中选择"New
game"，那么开始游戏并且显示游戏屏幕。游戏屏幕使用全屏画布（FullCanvas）。如果按下任何功能键，那么用户界面必须返回主菜单，并且应使游戏暂停。其他的按键对游戏是有效的。注意：游戏不应该在屏幕上创建任何功能键的标签。如果必须使用功能键标签，那么应用程序应该使用默认的Canvas屏幕Commands。示例代码没有解决诸如线程和线程安全等问题，这些问题在设计的时候必须格外注意。下面的代码是游戏屏幕的框架。<BR><BR></P>
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<TD>import javax.microedition.lcdui.*;<BR>import
com.nokia.mid.ui.*;<BR>public class GameFullCanvas extends
FullCanvas {<BR>private GameMIDlet parent = null;<BR>private
MainMenu menu = null;<BR>private boolean gamePaused =
false;<BR>public GameFullCanvas(GameMIDlet parent, MainMenu menu)
{<BR>this.parent = parent;<BR>this.menu = menu;<BR>}<BR>protected
void paint(Graphics g) {<BR>//Paint the game screen
here<BR>}<BR>protected void keyPressed(int keyCode) {<BR>if (keyCode
== KEY_SOFTKEY1 || keyCode == KEY_SOFTKEY2<BR>|| keyCode ==
KEY_SOFTKEY3) {<BR>gamePaused = true;<BR>//main menu to the
screen<BR>menu.init(parent);<BR>parent.setDisplayable(menu);<BR>}<BR>}<BR>public
void gameContinue() {<BR>gamePaused = false;<BR>}<BR>public boolean
isPaused() {<BR>return
gamePaused;<BR>}<BR>}</TD></TR></TBODY></TABLE><BR> 4
游戏选项屏幕<BR><BR> 用户可以通过选择主菜单中的"Options"选项改变特定的游戏选项。Options列表是固有的列表，包含处理游戏设置的条目，例如：声音、振动（见一、8节）、音调等等。如果要回到主菜单的话，需要使用Back命令。下面的代码是Options列表的框架。<BR><BR> 注意：如果游戏被安装到Games菜单的话，就不需要lights/sounds设置条目了，因为那些选项已经由Games菜单提供了。<BR><BR>
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<TD>import javax.microedition.lcdui.*;<BR>public class OptionList
extends List implements CommandListener {<BR>private GameMIDlet
parent = null;<BR>private MainMenu menu = null;<BR>private
KeyDefinitions def = null;<BR>private Command back = new Command("",
Command.BACK, 2);<BR>public OptionList(String p0, int p1, String[]
p2, Image[] p3,<BR>GameMIDlet parent, MainMenu menu) {<BR>super(p0,
p1, p2, p3);<BR>this.menu = menu;<BR>init(parent);<BR>}<BR>public
OptionList(String p0, int p1, GameMIDlet parent,<BR>MainMenu menu)
{<BR>super(p0, p1);<BR>this.menu =
menu;<BR>init(parent);<BR>}<BR>private void init(GameMIDlet parent)
{<BR>this.parent =
parent;<BR>this.addCommand(back);<BR>this.setCommandListener(this);<BR>//These
are just a examples for the game specific
options<BR>this.append(Resources.getString(Resources.ID_GAME_LEVEL),<BR>null);<BR>this.append(Resources.getString(Resources.ID_GAME_SOUNDS),<BR>null);<BR>this.append(Resources.getString(Resources.ID_GAME_VIBRA),<BR>null);<BR>}<BR>public
void commandAction(Command p0, Displayable p1) {<BR>if (p0 == back)
{<BR>parent.setDisplayable(menu);<BR>}<BR>else {<BR>List lis =
(List) p1;<BR>int idx = lis.getSelectedIndex();<BR>switch (idx)
{<BR>case 0:<BR>//TODO<BR>break;<BR>case
1:<BR>//TODO<BR>break;<BR>case 2:<BR>//TODO<BR>break;<BR>case
3:<BR>parent.setDisplayable(def);<BR>break;<BR>//More if
needed<BR>default:<BR>break;<BR>}<BR>}<BR>}<BR>}</TD></TR></TBODY></TABLE></SPAN><BR><BR></DIV></TD></TR>
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