<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" width="248" height="331" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,40,0"> <param name="src" value="/admin/blogs/586731/e:/scrollbar.png"> <embed type="application/x-shockwave-flash" width="248" height="331" src="/admin/blogs/586731/e:/scrollbar.png"></embed></object> 只需要修改其中的count 变量，就可以调整整个菜单中元素的数量。

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只要大家修改一下，就可以封装成一个滚动条ScroolBar的控件，以后使用的话，无非就是往这个屏幕里添加控件而已，很简单。

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大家多提宝贵意见啊！

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看了要回帖啊@@@@@@@

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public class TestCanvas extends Canvas implements Runnable{
?
?private boolean isColorChange = false,isRun = true,isVibrate = false;
?private int dragBox_Width = 17,dragBox_Height ;
?private int dragBox_X,dragBox_Y;
?private int dragLine_Width = 9,dragLine_Height;
?public int ScreenWidth,ScreenHeight;
?private Thread th = null;
?private int onDragColor = 0x40e0d0,defaultDragColor = 0x696969;
?private int curKey;
?private int vibrateTime = 20;
?private int vendor,offset = 0,bufImage_Y;
?private Image bufImage = null;
?private Graphics bufGraphics = null;
?int count = 64;
?
?TestCanvas(){
??setFullScreenMode(true);
??ScreenWidth = this.getWidth();
??ScreenHeight = this.getHeight();
??bufImage = Image.createImage(ScreenWidth - dragBox_Width - 5 - (dragBox_Width - dragLine_Width)/2,count*30);
??bufGraphics = bufImage.getGraphics();
??
??bufImage_Y = 0;
??dragLine_Height = ScreenHeight - 40;
??double f = (bufImage.getHeight() /dragLine_Height);
??dragBox_Height = (int)(dragLine_Height/f);
??dragBox_X = ScreenWidth - dragBox_Width - 5 - (dragBox_Width - dragLine_Width)/2;
??dragBox_Y = (ScreenHeight - dragLine_Height)/2;
??start();
?}
?
?public void paint(Graphics g){
??g.setColor(0);
??g.fillRect(0, 0, ScreenWidth, ScreenHeight);
??g.setColor(0xc0c0c0);
??g.fillRoundRect(ScreenWidth - dragBox_Width - 5,
????(ScreenHeight - dragLine_Height)/2, dragLine_Width, dragLine_Height, 5, 5);
??g.setColor(isColorChange?onDragColor:defaultDragColor);
??g.fillRoundRect(dragBox_X, dragBox_Y, dragBox_Width, dragBox_Height, 9, 9);
??bufGraphics.setColor(0);
??bufGraphics.fillRect(0,0,bufImage.getWidth(), bufImage.getHeight());
??bufGraphics.setColor(0xffffff);
??for(int i=0;i<count;i++){
???bufGraphics.drawString((i+1)+"", 20, i*30, 0);
??}
??g.drawImage(bufImage, 0, offset, 0);
?}
?
?public void run(){
??while(isRun){
???try{
????repaint();
????serviceRepaints();
????sleep(100L);
???}catch(Exception e){
????
???}
??}
?}
?
?public void start(){
??if(th == null){
???th = new Thread(this);
??}
??th.start();
?}
?
?public static void sleep(long time){
??try{
???Thread.sleep(time);
??}catch(Exception e){
???
??}
?}
?
?public void keyPressed(int key){
??curKey = key;
??switch(curKey){
??case -7:
???MidletTest.instance.exitApp();
???break;
??}
?}
?
?public void keyReleased(int key){
??curKey = 999;
?}
?
//?public void pointerPressed(int x, int y) {
//??isColorChange = true;
//??if(isVibrate == false){
//???MidletTest.instance.vibrate(vibrateTime);
//??}??
//??isVibrate = true;
//??vendor = dragBox_Y;
//??dragBox_Y? = y - dragBox_Height/2;?
//??dragBox_Y = (dragBox_Y - (ScreenHeight - dragLine_Height) / 2) <= 0 ? (ScreenHeight - dragLine_Height) / 2 - 1
//????: dragBox_Y >= ScreenHeight - (ScreenHeight - dragLine_Height)
//??????/ 2 - dragBox_Height ? ScreenHeight
//??????- (ScreenHeight - dragLine_Height) / 2 - dragBox_Height
//??????: y - dragBox_Height/2;
//??int i = (dragBox_Y - vendor)*(640/200);
//??System.out.println("屏幕需要走的:"+i);
//??if(i>0){
//???offset -= i;
//??}else{
//???offset += i;
//??}
//?}

?public void pointerReleased(int x, int y) {
??isColorChange = false;?
??isVibrate = false;
?}

?public void pointerDragged(int x, int y) {
??isColorChange = true;
??if(isVibrate == false){
//???MidletTest.instance.vibrate(vibrateTime);
??}??
??isVibrate = true;
??vendor = dragBox_Y;
??dragBox_Y? = y - dragBox_Height/2;?
??dragBox_Y = (dragBox_Y - (ScreenHeight - dragLine_Height) / 2) <= 0 ? (ScreenHeight - dragLine_Height) / 2 - 1
????: dragBox_Y >= ScreenHeight - (ScreenHeight - dragLine_Height)
??????/ 2 - dragBox_Height ? ScreenHeight
??????- (ScreenHeight - dragLine_Height) / 2 - dragBox_Height
??????: y - dragBox_Height/2;
??????bufImage.getHeight();
??float f1 = (bufImage.getHeight() - ScreenHeight);
??float f2 = ScreenHeight - 40 - dragBox_Height;
??float f = (f1/f2);
??float i = ((dragBox_Y - vendor)*f);
??if(y<((ScreenHeight - dragLine_Height)/2+(dragBox_Height/2))){
???offset = 0;
??}
??else
???if((y>=((ScreenHeight - dragLine_Height)/2+dragBox_Height/2))&&(y<=(ScreenHeight -(ScreenHeight - dragLine_Height)/2-dragBox_Height/2) )){
???offset -= i;
??}
??else if((y>(ScreenHeight -(ScreenHeight - dragLine_Height)/2-dragBox_Height/2))){
???int w = 0;
???w = -((count*30)-ScreenHeight);
???offset = w;
??}
??
?}

}