J2ME

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Java

ImageCanvas.java：源码内容

							package doublebufferdemo;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import java.io.*;
public class ImageCanvas extends Canvas
{
	private Image buffer;
	private Image image;
	public ImageCanvas()
        {
        try{
        image = Image.createImage("/tree.png"); 
        }catch(java.io.IOException e){
        System.out.println(e.getMessage());
        }
        buffer = Image.createImage(this.getWidth(), this.getHeight());
        Graphics bg = buffer.getGraphics();
        bg.setColor(0xFFFFFF);
        bg.fillRect(0, 0, getWidth(), getHeight());
        bg.drawImage(image,this.getWidth()/2, this.getHeight()/2, Graphics.VCENTER|Graphics.HCENTER);
        }
        public void paint(Graphics g)
        {
	g.drawImage(buffer,0,0,g.TOP|g.LEFT);
        }
}

						