Source Code : Low-Level Display Canvas:Key Code Example

Java Is Open Source Programming Language You Can Download From Java and Java Libraries From http://www.oracle.com. Click Here to download
We provide this code related to title for you to solve your developing problem easily. Libraries which is import in this program you can download from http://www.oracle.com. Click Here or search from google with Libraries Name you get jar file related it

Low-Level Display Canvas:Key Code Example

/*
J2ME: The Complete Reference

James Keogh

Publisher: McGraw-Hill

ISBN 0072227109

*/
//jad file (please verify the jar size)
/*
MIDlet-Name: KeyCodeExample
MIDlet-Version: 1.0
MIDlet-Vendor: MyCompany
MIDlet-Jar-URL: KeyCodeExample.jar
MIDlet-1: KeyCodeExample, , KeyCodeExample
MicroEdition-Configuration: CLDC-1.0
MicroEdition-Profile: MIDP-1.0
MIDlet-JAR-SIZE: 100

*/
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class KeyCodeExample extends MIDlet
{
  private Display  display;       
  private MyCanvas canvas;   
  public KeyCodeExample ()
  {
    display = Display.getDisplay(this);
    canvas  = new MyCanvas(this);
  }
  protected void startApp()
  {
    display.setCurrent(canvas);
  }
  protected void pauseApp()
  { 
  }
  protected void destroyApp( boolean unconditional )
  { 
  }
  public void exitMIDlet()
  {
    destroyApp(true);
    notifyDestroyed();
  }
}
class MyCanvas extends Canvas implements CommandListener
{
  private Command exit;          
  private String direction;
  private KeyCodeExample keyCodeExample;
  public MyCanvas (KeyCodeExample keyCodeExample)
  {
    direction = "2=up 8=dn 4=lt 6=rt";    
    this.keyCodeExample = keyCodeExample;
    exit = new Command("Exit", Command.EXIT, 1);
    addCommand(exit);
    setCommandListener(this);
  } 
  protected void paint(Graphics graphics)
  {
    graphics.setColor(255,255,255);
    graphics.fillRect(0, 0, getWidth(), getHeight());
    graphics.setColor(255, 0, 0);
    graphics.drawString(direction, 0, 0, 
                         Graphics.TOP | Graphics.LEFT);
  }
  public void commandAction(Command command, Displayable displayable)
  {
    if (command == exit)
    {
      keyCodeExample.exitMIDlet();
     }
  }
  protected void keyPressed(int key)
  {
    switch ( key ){
     case KEY_NUM2:
       direction = "up";
       break;
     case KEY_NUM8:
       direction = "down";
       break;
     case KEY_NUM4:
       direction = "left";
       break;
     case KEY_NUM6:
       direction = "right";
       break;
    }
    repaint();
  }
}


           
       

Thank with us