类似小球列表的选择控件（9宫格）

import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import com.tlt.util.Consts;
import com.tlt.util.Util;
import com.tlt.view.AppCanvas;
import com.tlt.view.CommonObject;

public class BallList extends CommonObject {

	AppCanvas appCanvas;
//	private Image[] balls;
//	int ballWidth;
	int ballCount;//小球个数
	public boolean[] selected;//选中的小球
	public boolean isLastLine,isFirstLine;//红框是否在最后一行或第一行
	public int selectedCount;//选中的小球个数
	public int min,max;//数字从min开始到max结束
	public int index=0;//总索引index=indexY*col+indexX
	public int indexX,indexY;
	public int col=10,row;
	public boolean isFocus=false;//是否显示小红框
	public BallList(AppCanvas appCanvas,int min,int max){
		this.appCanvas=appCanvas;
		this.min=min;
		this.max=max;
		this.ballCount=max-min+1;
//		balls=new Image[3];
//		balls[0]=Util.getImage("/ball.png");
//		balls[1]=Util.getImage("/ball_red.png");
//		balls[2]=Util.getImage("/ball_blue.png");
//		ballWidth=balls[0].getWidth();
	}
	public void close() {
		// TODO Auto-generated method stub
//		balls=null;
	}

	public void init() {
		// TODO Auto-generated method stub
		//根据屏幕大小判断一行显示小球的个数  
		if(Consts.SCREEN_HEIGHT>=300){
			col=10;
		}
		else if(Consts.SCREEN_HEIGHT>=196){
			col=8;
		}
		else if(Consts.SCREEN_HEIGHT>=128){
			col=4;
		}
		//计算行数
		if(ballCount%col==0){
			row=ballCount/col;
		}else{
			row=ballCount/col+1;
		}
		resetPosition();		
		selected=new boolean[ballCount];
	}
/**
	 * 设置红框的位置
	 */
	public void resetPosition(){
		index=5;
		indexX=5;
		indexY=0;
	}
	public void keyPressed(int keyCode) {
		// TODO Auto-generated method stub
		switch (keyCode) {
		case Consts.KEY_LS:
			break;
		case Consts.KEY_OK:
			selected[index]=!selected[index];
			if(selected[index]){
				selectedCount++;
			}else{
				selectedCount--;
			}
			break;
		case Consts.KEY_RS:
			break;
		case Consts.KEY_UP:
			index-=col;
			indexY--;
			if(indexY<=0){
				isFirstLine=true;
			}
			isLastLine=false;
			break;
		case Consts.KEY_DOWN:
			index+=col;
			indexY++;
			if(index>ballCount-1){
				index-=col;
				indexY--;
				isLastLine=true;
			}
			isFirstLine=false;
			break;
		case Consts.KEY_LEFT:
			if(index>0){
				index--;
				indexX--;
				if((index+1)%col==0){
					indexY--;
					indexX=col-1;
//					if(indexY<0){
//						indexY=0;
//						indexX=0;
//					}
				}
			}
			break;
		case Consts.KEY_RIGHT:
			if(index<ballCount-1){
				index++;
				indexX++;
				if(index%col==0){
					indexY++;
					indexX=0;
				}
			}
			break;
		}
	}

	public void keyReleased(int keyCode) {
		// TODO Auto-generated method stub

	}
	public void paint(Graphics g){
		
	}
	public void paint(Graphics g,int x, int y) {
		// TODO Auto-generated method stub
		drawBall(g,x,y);
	}

	public void run() {
		// TODO Auto-generated method stub

	}
	
	private void drawBall(Graphics g,int x, int y){
		int j=0;
		int gapX=0;
		if((Consts.SCREEN_WIDTH-col*ballWidth)%(col+1)==0){
			gapX=(Consts.SCREEN_WIDTH-col*ballWidth)/(col+1);
		}else{
			gapX=(Consts.SCREEN_WIDTH-col*ballWidth)/(col+1)+1;
		}
		int gap=ballWidth+gapX;
		for(int i=0;i<ballCount;i++){
			g.drawImage(selected[i]?balls[1]:balls[0], x+gapX+gap*i-j*(col*gap), y+j*gap, Graphics.TOP|Graphics.LEFT);
				g.setColor(selected[i]?0xffffff:0x0);
				g.drawString((i+min)+"", x+gapX+gap*i-j*(col*gap)+(ballWidth>>1),  y+j*gap+(ballWidth>>1)+8, Graphics.BASELINE|Graphics.HCENTER);
			if((i+1)%col==0){
				j++;
			}
		}
		
		//小红框
		if(isFocus){
			g.setColor(0xff0000);
			g.drawRect(x+gapX+indexX*gap, y+indexY*gap, ballWidth-1, ballWidth-1);
		}
		
	}

}