Java Programing laungage

J2ME Projects

J2ME Project 1

Creating a J2ME Application for add Canvas into Form

CanvasThe Canvas class is a base class for writing applications that need to handle low-level events and to issue graphics calls for drawing to the display.

Canvas canvas= new Canvas();

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A program for add Canvas into Form


/*
 * save as a addCanvas.java
 */
package r4r.Mobile.Basic;

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

/**
 * @author R4R
 */
public class addCanvas extends MIDlet {

    /* -- private field -- */
    private Canvas canvas;
    private Display display;
    private Command exit;

    public addCanvas() {
        display = Display.getDisplay(this);
        canvas = new userCanvas();  //invoke userCanvas class
        exit = new Command("EXIT", Command.EXIT, 1);
        canvas.addCommand(exit); // add command button into canvas
    }
				

    public void startApp() {
        canvas.setCommandListener(new CommandListener() {

            public void commandAction(Command c, Displayable d) {
                if (c == exit) {
                    destroyApp(true);
                    notifyDestroyed();
                }
            }
        });
        display.setCurrent(canvas);
    }

    public void pauseApp() {
    }

    public void destroyApp(boolean unconditional) {
    }
}

class userCanvas extends Canvas {

    protected void paint(Graphics g) {
        g.fillRect(0, 0, getWidth(), getHeight());
        // set up back ground color of canvas
        g.setColor(255, 255, 255);
        // draw and fill the rectangle with a specific color
        g.fillRect(40, 50, 70, 70);
        g.setColor(200, 100, 0);
    }
}


 

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