×
Namespaces

Variants
Actions

How to display the camera & take snapshots in Java ME

From Nokia Developer Wiki
Jump to: navigation, search

This Java ME Camera MIDletcode example shows how to display the camera and take snapshots.

Article Metadata
Article
Created: wang_shui (20 Mar 2007)
Last edited: hamishwillee (29 Jul 2013)

Source code

import java.io.IOException;
import javax.microedition.lcdui.*;
import javax.microedition.media.*;
import javax.microedition.media.control.*;
import javax.microedition.midlet.MIDlet;
import javax.microedition.media.control.VideoControl;
 
public class CameraMIDlet 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 CameraMIDlet() {
 
exit = new Command("Exit", Command.EXIT, 0);
camera = new Command("Camera", Command.SCREEN, 0);
back = new Command("Back", Command.BACK, 0);
capture = new Command("Capture", Command.SCREEN, 0);
 
form = new Form("Capture Video");
form.addCommand(camera);
form.setCommandListener(this);
}
 
public void startApp() {
display = Display.getDisplay(this);
display.setCurrent(form);
}
 
public void pauseApp() {}
 
public void destroyApp(boolean unconditional) {}
 
public void commandAction(Command c, Displayable s) {
if (c == exit) {
destroyApp(true);
notifyDestroyed();
} else if (c == camera) {
showCamera();
} else if (c == back)
display.setCurrent(form);
else if (c == capture) {
video = new Video(this);
video.start();
}
}
 
public void showCamera() {
try {
player = Manager.createPlayer("capture://video"); // "capture://video" is used for S60 devices
//player = Manager.createPlayer("capture://image"); // "capture://image" is used for Series 40 devices
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 {
CameraMIDlet midlet;
public Video(CameraMIDlet midlet) {
this.midlet = midlet;
}
 
public void run() {
captureVideo();
 
}
 
public void captureVideo() {
try {
byte[] raw = videoControl.getSnapshot(null);
Image image = Image.createImage(raw, 0, raw.length);
form.append(image);
display.setCurrent(form);
 
player.close();
player = null;
videoControl = null;
} catch (MediaException me) { }
}
};
}


The following code is used for displaying camera video using canvas:

import javax.microedition.lcdui.*;
import javax.microedition.media.MediaException;
import javax.microedition.media.control.VideoControl;
 
public class VideoCanvas extends Canvas {
private CameraMIDlet midlet;
 
public VideoCanvas(CameraMIDlet 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(0x00ff00);
g.drawRect(0, 0, width - 1, height - 1);
g.drawRect(1, 1, width - 3, height - 3);
}
}

Using this code

  1. Create a new project in Sun WTK or in NetBeans as CameraMIDlet.
  2. Copy the two files according to their class name.
  3. Build Project.
  4. Run Project.

TODO: list available modes, and when you need to use a different locator

Helpful links

This page was last modified on 29 July 2013, at 10:19.
152 page views in the last 30 days.

Was this page helpful?

Your feedback about this content is important. Let us know what you think.

 

Thank you!

We appreciate your feedback.

×