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How to write a Basic MIDLET |
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MIDlet is a MIDP application on a J2ME device. To illustrate the components of a very basic MIDlet a classic "Hello World" application is written here.
The MIDlet will display the message "Hello World!" on the screen. You can use a simulator to see the output of this midlet.
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
/*
* This is the main class of the hello world demo.
*/
public class HelloWorld extends MIDlet implements CommandListener
{
private Command exitCommand;
private TextBox tb;
/**
* This is constructor of class HelloWorld.
* The Command objects appear as buttons.
*/
public HelloWorld()
{
exitCommand = new Command("Exit", Command.EXIT, 1);
tb = new TextBox("Hello world MIDlet", "Hello World!", 25, 0);
}
// implementation of MIDlet
/**
* Start the application.
*/
protected void startApp()
{
tb.addCommand(exitCommand);
tb.setCommandListener(this);
Display.getDisplay(this).setCurrent(tb);
}
/**
* This method is called to notify the MIDlet to enter a paused
* state. The MIDlet should use this opportunity to release
* shared resources.
*/
protected void pauseApp() {}
/**
* If the MIDlet was using resources, it should release
* them in this method.
*/
protected void destroyApp(boolean bool) {}
public void commandAction(Command cmd, Displayable disp)
{
if (cmd == exitCommand) {
destroyApp(false);
notifyDestroyed();
}
}
}
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