showchoicegroup.java

编写j2me程序时,必备的midlet扩展类.

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

public class ShowChoiceGroup extends MIDlet implements CommandListener 

{ 
private Display display; 
private Form props; 


private Image duke; 
private Image[] imageArray; 
private ChoiceGroup choice; 

private Command exitCommand = new Command("Exit", Command.EXIT, 1); 

public ShowChoiceGroup() 
{ 
display = Display.getDisplay(this); 
} 

public void startApp() 
{ 
props = new Form("Hello World"); 
//props.append("Hello World!\n"); 
try 
{ 
Image duke= Image.createImage("/fancy/test/Icon.png"); 
imageArray = new Image[]{duke,duke,duke}; 
String[] stringArray = { "Option A", "Option B", 
"Option C" }; 
choice=new ChoiceGroup("choice group", 

ChoiceGroup.MULTIPLE,stringArray,imageArray); 
props.append(choice); 
} 
catch(Exception fe) 
{ 
//to do nothing. 
} 
props.addCommand(exitCommand); 
props.setCommandListener(this); 
display.setCurrent(props); 
} 

public void commandAction(Command c, Displayable s) 
{ 
if (c == exitCommand) 
{ 
destroyApp(false); 
notifyDestroyed(); 
}

public void destroyApp(boolean unconditional) 

{ 
} 

public void pauseApp() 
{ 
display.setCurrent(null); 
props = null; 
} 
}