simplecanvas.java

在eclipse环境下

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Graphics;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class SimpleCanvas extends MIDlet {
    Display display;
    
    //画布
    MyCanvas mc;
    
    public SimpleCanvas() {
        super();
        //创建画布对象实例
        mc = new MyCanvas();
    }

    protected void startApp() throws MIDletStateChangeException {
        //获得当前MIDlet的Display对象
        display = Display.getDisplay(this); 
        //设置MyCanvas对象为当前显示对象
        display.setCurrent(mc);
    }

    protected void pauseApp() {
        // TODO Auto-generated method stub

    }

    protected void destroyApp(boolean arg0) 
        throws MIDletStateChangeException {
        // TODO Auto-generated method stub

    }
    
    /**
     * 画布实现
     */
    class MyCanvas extends Canvas {
        protected void paint(Graphics g) {
            //在这个方法中绘制屏幕
        }
    }
}