在LCDUI
架构中
画面上同
时间只能有个Displayable对象导致MIDP
设计中界面流程跳转设计比较麻烦www. 本模式能解决此问题: 考虑以下几个界面
: 1．帮助介绍说明
每个帮助介绍说明
界面风格致只是介绍说明文字区别用Form实现
2．版权声明
给出系统
版权信息用Alert实现在个游戏中最好只有个降低系统内存 3．主界面
用List
IMPLICIT实现为了降低内存使用在系统中也只存在个 4．设置界面
用Form实现
5．游戏界面
用Canvas实现比较好
如果是其他应用也可以用Form来实现 6．启动界面
只是在系统开始时用到
用Alert实现 代码设计实现如下:
packageexample.midletsuite;
importjavax.microedition.lcdui.*;
importjavax.microedition.midlet.*;
importjava.util.*;
public
FlowControlextendsMIDlet{ booleaninit=true;
publicFlowControl
{ Navigator.display=Display.getDisplay(this);
Navigator.midlet=this;
}
protectedvoidstartApp
{ Navigator.current=Navigator.MAIN_SCREEN;
Navigator.show(null);
(init){ Alertsplash=
Alert(\"启动画面\"); splash.
Type(AlertType.CONFIRMATION); splash.
Timeout(5000); Navigator.display.
Current(splash); init=false;
}
}
protectedvoidpauseApp
{} protectedvoiddestroyApp(booleanu){}
}
Navigator{ finalpublic
MAIN_SCREEN=1; finalpublic
GAME_SCREEN=2; finalpublic
SET_SCREEN=3; finalpublic
SET_HELP_SCREEN=4; finalpublic
GAME_HELP_SCREEN=5; public
MIDletmidlet; public
Displaydisplay; public
current=1; public
voidshow(Objectobj){ switch(current){
MAIN_SCREEN: display.
Current(MainScreen.getInstance); 
; GAME_SCREEN: [Page]display.
Current(GameScreen.getInstance); ; SET_SCREEN: display.
Current(SetScreen.getInstance); ; SET_HELP_SCREEN: display.
Current(HelpScreen((String)obj)); ; GAME_HELP_SCREEN: display.
Current(HelpScreen((String)obj)); ; }
}
public
voidflow(Stringcmd){ switch(current){
MAIN_SCREEN: (cmd.equals(\"开始\")){ current=GAME_SCREEN;
show(null);
}
(cmd.equals(\"设置\")){ current=SET_SCREEN;
show(null);
}
(cmd.equals(\"版权声明\")){ display.
Current(CopyrightScreen.getInstance); show(null);
}
(cmd.equals(\"离开\")){ midlet.not
yDestroyed; }
; GAME_SCREEN: (cmd.equals(\"规则介绍\")){ current=GAME_HELP_SCREEN;
show(\"游戏规则介绍\");
}
(cmd.equals(\"返回\")){ current=MAIN_SCREEN;
show(null);
}
; SET_SCREEN: (cmd.equals(\"设置介绍说明\")){ current=SET_HELP_SCREEN;
show(\"设置方式\");
}
(cmd.equals(\"返回\")){ current=MAIN_SCREEN;
show(null);
}
; GAME_HELP_SCREEN: (cmd.equals(\"返回\")){
current=GAME_SCREEN;
show(null);
}
; SET_HELP_SCREEN: (cmd.equals(\"返回\")){ current=SET_SCREEN;
show(null);
}
; }
}
}
//帮助介绍说明界面Singleton模式
HelpScreenextendsFormimplementsCommandListener{ publicHelpScreen(Stringc){
super(\"帮助介绍说明\");
append(c);
addCommand(
Command(\"返回\",Command.OK,1)); CommandListener(this); }
publicvoidcommandAction(Commandc,Displayabled){
Navigator.flow(c.getLabel
); }
}
//版权界面Singleton模式 [Page]
CopyrightScreenextendsAlert{ private
Displayableinstance; synchronizedpublic
DisplayablegetInstance{ (instance
null){ instance=
CopyrightScreen; }
instance; }
privateCopyrightScreen
{ super(\"版权声明\");
String(\"此应用的版权归NIIT教研室所有\"); Type(AlertType.INFO); Timeout(Alert.FOREVER); }
}
//主界面Singleton模式
MainScreenextendsListimplementsCommandListener{ private
Displayableinstance; synchronizedpublic
DisplayablegetInstance{ (instancenull){ instance=
MainScreen; }
instance; }
privateMainScreen
{ super(\"主菜单\",List.IMPLICIT);
append(\"开始\",null);
append(\"设置\",null);
append(\"版权声明\",null);
append(\"离开\",null);
CommandListener(this); }
publicvoidcommandAction(Commandc,Displayabled){
Stringcmd=getString(getSelectedIndex
); Navigator.flow(cmd);
}
}
//设置主界面Singleton模式
SetScreenextendsFormimplementsCommandListener{ private
Displayableinstance; TextFieldurl=null;
Gaugevolume=null;
synchronizedpublic
DisplayablegetInstance{ (instancenull){ instance=
SetScreen; }
instance; }
privateSetScreen
{ super(\"设置\");
url=
TextField(\"请输入服务器设置\",\"
://127.0.0.1:99\",40,TextField.URL); append(url);
volume=
Gauge(\"音量\",true,10,3); append(volume);
addCommand(
Command(\"设置介绍说明\",Command.HELP,1)); addCommand(
Command(\"返回\",Command.BACK,1)); CommandListener(this); }
publicvoidcommandAction(Commandc,Displayabled){ [Page]
Navigator.flow(c.getLabel
); }
}
//游戏主界面Singleton模式
GameScreenextendsFormimplementsCommandListener{ private
Displayableinstance; TextFieldurl=null;
Gaugevolume=null;
synchronizedpublic
DisplayablegetInstance{ (instancenull){ instance=
GameScreen; }
instance; }
privateGameScreen
{ super(\"游戏\");
addCommand(
Command(\"规则介绍\",Command.HELP,1)); addCommand(
Command(\"返回\",Command.BACK,1));
CommandListener(this); }
publicvoidcommandAction(Commandc,Displayabled){
Navigator.flow(c.getLabel
); }
}
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