keyhandlemid.java

J2ME MIDP 2.0 无线设备编程的一些源码

//keyHandleMID.java file
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class keyHandleMID extends MIDlet implements CommandListener
{

    private Command exitCommand;
    private DemoCanvas myCanvas;
    public keyHandleMID()
    {
        exitCommand =new Command("Exit",Command.EXIT,1);
        myCanvas =new DemoCanvas();
        myCanvas.addCommand(exitCommand);
        myCanvas.setCommandListener(this);
    }
    protected void startApp(  ) throws MIDletStateChangeException
    {
        Display.getDisplay(this).setCurrent(myCanvas);
    }

    protected void pauseApp(  )
    {
    }

    protected void destroyApp( boolean p1 )
    {
    }

    public void commandAction(Command c,Displayable d)
    {
        if (c ==exitCommand)
        {
            destroyApp(false);
            notifyDestroyed();
        }
    }
    //internal class DemoCanvas
    public class DemoCanvas extends Canvas
    {
        private String textShow="";
        public DemoCanvas() 
        {
            System.out.println("hasRepeatEvents = " + hasRepeatEvents());
            System.out.println("hasPointerEvents = " + hasPointerEvents());
            System.out.println("hasPointerMotionEvents = " + hasPointerMotionEvents());
        }
  
        public void paint(Graphics g) 
        {
            g.setColor(0xffffff);
            g.fillRect(0, 0, getWidth(), getHeight());
            g.setColor(0x000000);
            g.drawString(textShow,0,0,Graphics.TOP|Graphics.LEFT);
            
            g.drawString("hasRepeatEvents = " + hasRepeatEvents(),0,20,Graphics.TOP|Graphics.LEFT);            
            g.drawString("hasPointerEvents = " + hasPointerEvents(),0,40,Graphics.TOP|Graphics.LEFT);            
            g.drawString("hasPointerMotionEvents = " + hasPointerMotionEvents(),0,60,Graphics.TOP|Graphics.LEFT);            
            System.out.println(textShow);
        }
  
        protected  void keyPressed(int keyCode) 
        {
            textShow = "keyPressed( "+ getKeyName(keyCode) +" )";
            this.repaint();
        }
        protected  void keyReleased(int keyCode) 
        {
            textShow = "keyReleased( "+ getKeyName(keyCode) +" )";
            this.repaint();
        }
        protected  void keyRepeated(int keyCode) 
        {
            textShow = "keyRepeated( "+ getKeyName(keyCode) +" )";
            this.repaint();
        }
        protected  void pointerDragged(int x, int y) 
        {
            textShow = "pointerDragged( "+ x +","+y +" )";
            this.repaint();
        }
        protected  void pointerPressed(int x, int y) 
        {
            textShow = "pointerPressed( "+ x +","+y +" )";
            this.repaint();
        }
        protected  void pointerReleased(int x, int y) 
        {
            textShow = "pointerReleased( "+ x +","+y +" )";
            this.repaint();
        }
    }
}