To implement a Midlet that shows a Bouncing Ball > Java ME Program

To implement a Midlet that shows a Bouncing Ball > Java ME Program

Mobile Communication and Computing

Program:

package mobileapplication1;

import java.util.Timer;

import java.util.TimerTask;

import javax.microedition.lcdui.Canvas;

import javax.microedition.lcdui.Command;

import javax.microedition.lcdui.CommandListener;

import javax.microedition.lcdui.Display;

import javax.microedition.lcdui.Displayable;

import javax.microedition.lcdui.Graphics;

import javax.microedition.midlet.*;

public class Midlet_2 extends MIDlet {

    Display d;

        MyCanvas m;

     Timer t;

    MyTask mt;

    int x=10,y=10;

    int xiner=1,yiner=1;

    Command start, stop;

     Command c;

    public void startApp() {

          d=Display.getDisplay(this);

       m= new MyCanvas();

       d.setCurrent(m);

    }

    class MyTask extends TimerTask

    {

        public void run()

        {

            m.repaint();

           

        }

    }

    class MyCanvas  extends Canvas implements CommandListener

      

    {

        MyCanvas()

        { start=new Command("start", Command.SCREEN,1);

        addCommand(start);

   stop=new Command("stop", Command.SCREEN,2);

        addCommand(stop);

       setCommandListener(this);}

     public void  paint(Graphics g)

        {  g.setColor(255,255,255);

              g.fillRect(0,0,getWidth(),getHeight());

              g.setColor(255,0,0);

                  

              x+=20*xiner;

              y+=50*yiner;

              if(x>getWidth()-20 || x<0 )

              { xiner*=-1;

                  }

              if(y>getHeight()-50||y<0)

              {yiner*=-1;

             

              }

            g.fillArc(x,y, 20,20,0,360);

       

    }

        public void commandAction(Command c, Displayable d) {

          //  throw new UnsupportedOperationException("Not supported yet.");

      if(c==start)

     {

      t=new Timer();

      mt=new MyTask();

      t.schedule(mt,1000,500);

           }

     else if(c==stop)

     {

          t.cancel();

          mt.cancel();

     }   }

    }

   

    public void pauseApp() {

    }

   

    public void destroyApp(boolean unconditional) {

    }

}

OUTPUT: