by Manoj Alwis

Hi friends,

In this month’s J2ME Lesson, I will explain how to capture Video using mobile phone. Up to now I think you know how to create MIDP project in NetBeans IDE, in my first lesson I explained how to create project using Netbeans IDE. In today’s Lesson, first I will create MIDP project in NetBeans by the name VideoControlExample. Then I will create package like “src”. Under that package I will create VideoControlExample Midlet  . That Midlet includes all the coding part of the program.<?XML:NAMESPACE PREFIX = O />

Specially In this example I want to show you, how to capture the video clip. The below source code shows you to create the player and capture the video.

There are the following methods are used in the Video Control:

• getDisplayHeight()
  
• getDisplayWidth()
  
• getDisplayX()
  
• getDisplayY()
  
• getSnapshot(java.lang.String imageType)
  
• getSourceHeight()
  
• getSourceWidth()
  
• initDisplayMode(int mode, java.lang.Object arg)
  
• setDisplayFullScreen(boolean fullScreenMode)
  
• setDisplayLocation(int x, int y)
  
• setDisplaySize(int width, int height
  
• setVisible(boolean visible)

After pressed camera button  it looks like this

Then press Capture button …………

Next press Yes button to record a snapshot image……….

Now you can try this example  using this following source code

package src;

/**

 * @author Manoj

 */

import java.io.IOException;

import javax.microedition.lcdui.*;

import javax.microedition.media.*;

import javax.microedition.midlet.MIDlet;

import javax.microedition.media.control.VideoControl;

public class VideoControlExample extends MIDlet implements CommandListener{

  private Display display;

    private Form form;

    private Command exit, back, capture, camera;

     private Player player;

    private VideoControl videoControl;

    private Video video;

     public VideoControlExample() {

    display = Display.getDisplay(this);

   form = new Form("Capture Video");

  exit = new Command("Exit", Command.EXIT, 0);

    camera = new Command("Camera", Command.SCREEN, 1);   //  these codes explain how to design buttons’ in UI

     back = new Command("Back", Command.BACK, 2);

      capture = new Command("Capture", Command.SCREEN, 3);

    form.addCommand(camera);

   form.setCommandListener(this);

  }

    public void startApp() {

        display.setCurrent(form);

    }

    public void pauseApp() {}

    public void destroyApp(boolean unconditional){

        notifyDestroyed();

    }

   public void commandAction(Command c, Displayable s){

        String label = c.getLabel();

        if (label.equals("Exit")){

            destroyApp(true);

   } else if (label.equals("Camera")) {

            showCamera();

       } else if (label.equals("Back"))

            display.setCurrent(form);

        else if (label.equals("Capture")) {

            video = new Video(this);

        video.start();

        }

    }

    public void showCamera(){

       try{

        player = Manager.createPlayer("capture://video");

        player.realize();

        videoControl = (VideoControl)player.getControl("VideoControl");

        Canvas canvas = new VideoCanvas(this, videoControl);

        canvas.addCommand(back);

        canvas.addCommand(capture);

        canvas.setCommandListener(this);

        display.setCurrent(canvas);

        player.start();

        } catch (IOException ioe) {} catch (MediaException me) {}

    }

    class Video extends Thread {

        VideoControlExample midlet;

        public Video(VideoControlExample midlet) {

        this.midlet = midlet;

        }

    public void run() {

   captureVideo();

    }

    public void captureVideo() {

        try {

             byte[] photo = videoControl.getSnapshot(null);

            Image image = Image.createImage(photo, 0, photo.length);

            form.append(image);

            display.setCurrent(form);

            player.close();

            player = null;

            videoControl = null;

            } catch (MediaException me) { }

        }

    };

}

class VideoCanvas extends Canvas {

    private VideoControlExample midlet;

    public VideoCanvas(VideoControlExample midlet, VideoControl videoControl) {

    int width = getWidth();

    int height = getHeight();

    this.midlet = midlet;

    videoControl.initDisplayMode(VideoControl.USE_DIRECT_VIDEO, this);

    try {

        videoControl.setDisplayLocation(2, 2);

        videoControl.setDisplaySize(width - 4, height - 4);

        } catch (MediaException me) {}

        videoControl.setVisible(true);

   }

    public void paint(Graphics g) {

        int width = getWidth();

        int height = getHeight();

        g.setColor(255, 0, 0);

        g.drawRect(0, 0, width - 1, height - 1);

        g.drawRect(1, 1, width - 3, height - 3);

    }

}

You can try lot of new J2ME example’s in my next lessons   .  Thank you ………. 

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