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Example Midlet to demonstrate Commands - Items and Event Processing |
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This Midlet demonstrates Commands, Items, and Event Processing.
/*
J2ME: The Complete Reference
James Keogh
Publisher: McGraw-Hill
ISBN 0072227109
*/
//jad file (please verify the jar size)
/*
MIDlet-Name: ThrowException
MIDlet-Version: 1.0
MIDlet-Vendor: MyCompany
MIDlet-Jar-URL: ThrowException.jar
MIDlet-1: ThrowException, ThrowException.png, ThrowException
MicroEdition-Configuration: CLDC-1.0
MicroEdition-Profile: MIDP-1.0
MIDlet-JAR-SIZE: 100
*/
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class ThrowException extends MIDlet
implements CommandListener
{
private Display display;
private Form form;
private Command exit;
private boolean isSafeToQuit;
public ThrowException()
{
isSafeToQuit = false;
display = Display.getDisplay(this);
exit = new Command("Exit", Command.SCREEN, 1);
form = new Form("Throw Exception");
form.addCommand(exit);
form.setCommandListener(this);
}
public void startApp()
{
display.setCurrent(form);
}
public void pauseApp()
{
}
public void destroyApp(boolean unconditional)
throws MIDletStateChangeException
{
if (unconditional == false)
{
throw new MIDletStateChangeException();
}
}
public void commandAction(Command command,
Displayable displayable)
{
if (command == exit)
{
try
{
if (isSafeToQuit == false)
{
StringItem msg = new StringItem ("Busy", "Please try again.");
form.append(msg);
destroyApp(false);
}
else
{
destroyApp(true);
notifyDestroyed();
}
}
catch (MIDletStateChangeException exception)
{
isSafeToQuit = true;
}
}
}
}
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