6.3.1 Image图片显示

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第一个安装JDK的ava程序测试
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import javax.microedition.midlet.×;
import javax.microedition.lcdui.×;

public class canvasDemo2 extends MIDlet
{
Display display;
canvasAnchor canvasanchor;

   public canvasDemo2()
{
canvasanchor=new canvasAnchor();
display=Display.getDisplay(this);
}

   public void startApp()
{
display.setCurrent(canvasanchor);
}

   public void pauseApp(){}

   public void destroyApp(boolean unconditional){}

   class canvasAnchor extends Canvas 
{
int     gameaction=0;
int     moveX=0;
int     moveY=0;
int[]   moveLR={Graphics.RIGHT, Graphics.HCENTER, Graphics.LEFT};
int[]   moveUD={Graphics.BOTTOM, Graphics.VCENTER, Graphics.TOP};
String[] anchorLR={"Graphics.RIGHT", "Graphics.HCENTER", "Graphics. LEFT"};
String[] anchorUD={"Graphics.BOTTOM", "Graphics.VCENTER", "Graphics. TOP"};
Image   pictureImage;

      public canvasAnchor()
{
try{
pictureImage=Image.createImage("/picture.png");
}catch(Exception ex){} 
}

public void keyPressed(int keyCode) 
{
gameaction=getGameAction(keyCode);
switch(gameaction)
{
case LEFT:
moveX--;
if(moveX<0) moveX=0;
repaint();
break;
case RIGHT: 
moveX++;
if(moveX>2) moveX=2;
repaint();
break; 
case UP:
moveY--;
if(moveY<0) moveY=0;
repaint();                
break;
case DOWN:    
moveY++;
if(moveY>2) moveY=2;
repaint();            
break;
}
}
public void paint(Graphics g)
{ 
g.setColor(0xFFFFFF);
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(0);
g.drawString("游戏图片的锚点", getWidth()/2, 2, Graphics.HCENTER | 
Graphics.TOP);
g.drawString("状态:"+anchorLR[moveX]+" 左右数值:"+String.va lueOf
(moveLR[moveX]),
0, 22, Graphics.LEFT | Graphics.TOP);
g.drawString("状态:"+anchorUD[moveY]+" 上下数值:"+String.valueOf
(moveUD[moveY]),
0, 42, Graphics.LEFT | Graphics.TOP);
g.drawImage(pictureImage, getWidth()/2, 117, moveLR[moveX] | 
moveUD[moveY]);
g.drawLine(0,117,getWidth(),117);
g.drawLine(getWidth()/2,57,getWidth()/2,177);
}
}
}