canvasdemo.java

javaME useful code with the J2ME helpful learning cla

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class CanvasDemo extends Canvas
implements CommandListener
{
public CanvasDemo ()
{
setTitle("全屏幕测试") ;
setTicker(new Ticker("Ticker ")) ;
addCommand(new Command("全屏幕",Command.SCREEN,1)) ;
addCommand(new Command("正常",Command.SCREEN,1)) ;
setCommandListener(this) ;
}
public void paint(Graphics g)
{
g.setColor(125,125,125);//灰色
g.fillRect(0,0,getWidth(),getHeight());
g.setColor(0,0,0);//黑色
g.drawLine(10,10,150,10);
}
public void commandAction(Command c,Displayable s)
{
String cmd = c.getLabel();
if(cmd.equals("全屏幕"))
{
setFullScreenMode(true) ;
}else if(cmd.equals("正常"))
{
setFullScreenMode(false) ;
}
}
protected void sizeChanged(int w,int h)
{
System.out.println("改变后的宽度："+w) ;
System.out.println("改变后的高度："+h) ;
}
protected void hideNotify()
{
System.out.println("屏幕被系统遮蔽") ;//会在WTK 控制台中显示，
//读者需要注意
}
protected void showNotify()
{
System.out.println("屏幕显示在屏幕上") ;
}
}