J2ME用 Canvas做的联系人list

其中h表示画布的高度，title表示标题，index表示选中的下飚，还可以得到选中的标签和ID，支持触摸事件，这是个抽象类，要自己处理自己的事情，还需要实现doAction方法即使点击OK按钮后需要执行的代码，界面做的太丑，背景色自己调吧。

import CanvasMidlet;

import java.io.IOException;
import java.util.Vector;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;


public abstract class MyList extends Canvas{

CanvasMidlet parent = null;
 
 Vector names = null;
    Vector ids = null;
 int index = 0; // 当前选中操作目录索引
 int h = 18; // 每条目录高度
 int firstItem = 0; // 第一个ITEM
 int maxItemCount = this.getWidth() / h - 1; // 最多能显示多少个Item
 int startIndex = 0; // 开始索引
 int endIndex = 0; // 结束索引
 int tabIndex = 0;
 String title = "";
 int topIndex = 0;
 String imageSrc = "";
 
 public MyList(String title,Vector names,Vector ids,int topIndex,String imageSrc) {
  this.names = names;
  this.ids= ids;
  this.topIndex = topIndex;
  this.title = title;
  this.imageSrc = imageSrc;
 }
 
 protected void paint(Graphics g) {
  this.clearBgColor(g);
  drawTitle(g,this.title);
  this.showList(g, names);
 }

 /*个人通讯录*/
 public void showList(Graphics g, Vector names) {
  if (names.size() <= maxItemCount) {
   endIndex = names.size();
  } else {
   if (firstItem < 0)
    firstItem = 0;
   if (firstItem >= (names.size() - maxItemCount))
    firstItem = names.size() - maxItemCount;
   this.startIndex = firstItem;
   endIndex = this.startIndex + this.maxItemCount;
  }
  this.drawList(g, startIndex, endIndex);
 }


 
 public void drawList(Graphics g, int st, int end) {
  Image image = null;
//  Font f = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN,
//    Font.SIZE_SMALL);
  int fontColor = 0;
  int j = 1;
  for (int i = st; i < end; i++) {
   int y1 = h * j + this.topIndex;
   int y2 = h * j + 3 +this.topIndex;
   j++;
   if (i == index) {
    fontColor = 0xffffff;
    g.setColor(0, 85, 153);
    g.fillRect(0, y1, getWidth(), h);
   } else {
    fontColor = 0;
    g.setColor(0xffffff);
    g.fillRect(0, y1, getWidth(), h);
   }
   try {
    image = Image.createImage(this.imageSrc);
   } catch (IOException e) {
    System.out.println("找不到文件"+this.imageSrc);
    e.printStackTrace();
   }
   g.drawImage(image, 0, y2, 0);
   g.setColor(fontColor);
//   g.setFont(f);
   g.drawString(names.elementAt(i).toString(), 15, y1 + 1, Graphics.LEFT | Graphics.TOP);
  }
 }

 protected synchronized void keyPressed(int keyCode) {
  int action = getGameAction(keyCode);
  switch (action) {
  case DOWN: {
   if (index == names.size() - 1) {
    index = 0;
    firstItem = 0;
   } else {
    if (maxItemCount < names.size()) {
     if (index >= maxItemCount - 1)
      firstItem++;
    }
    index++;
   }
   this.repaint();
   break;
  }
  case UP: {
   if (index == 0) {
    index = names.size() - 1;
    firstItem = names.size() - this.maxItemCount;
   } else {
    if (maxItemCount < names.size()) {
     if (index == firstItem) {
      firstItem--;
     }
    }
    index--;
   }
   this.repaint();
   break;
  }
  case FIRE: {
   doAction();
   break;
  }
  default: {
   break;
  }
  }
 }

 protected void pointerPressed(int x, int y) {
  if(y<18) return; //选中标题什么都不做
   int count = y / h - 1;
   int clickIndex = firstItem + count;
   if(clickIndex > names.size()) return ;//选中空白地方 什么都不做
   if(clickIndex != index){  
    index = clickIndex;
    this.repaint();
   }

 }

 public abstract void doAction();
 
 /*获取选中项名称*/
 public String getSelectedName(){
  return this.names.elementAt(index).toString();
 }
 
 /*获取选中项ID*/
 public int getSelectedID(){
  return Integer.parseInt(names.elementAt(index).toString());
 }
 
 /*获取选中项索引*/
 public int getSelectedIndex(){
  return index;
 }
 
 /*清除上一画布*/
 public void clearBgColor(Graphics g){
  g.setColor(0xffffff);
  g.fillRect(0, 0, this.getWidth(), this.getHeight());
 }
 
 public void drawTitle(Graphics g,String title){
  int width = Font.getDefaultFont().stringWidth(title);
  g.setColor(0);
  g.drawString(title, (this.getWidth() - width)/2 , 0, g.LEFT|g.TOP); //居中显示
 }
}

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