imagelist.java

《j2me开发精解〉（詹健飞）CD-rom附带源码。用netbeans

package com.j2medev.ch8.mmapi;

import javax.microedition.lcdui.*;

public class ImageList extends List implements CommandListener {
    
    private PowerCamera pc = null;
    private Picture[] pic = null;//存储RMS中的Picture数组
    private int currentPos = -1;//存储当前浏览的图片
    public static final Command backCommand = new Command("返回",Command.BACK,1);
    public static final Command nextCommand = new Command("下一个",Command.OK,1);
    public static final Command listCommand = new Command("列表",Command.BACK,2);
    
    public ImageList(PowerCamera pc) {
        super("图片列表",List.IMPLICIT);
        this.pc = pc;
        this.addCommand(backCommand);
        this.setCommandListener(this);
    }
    
    public void initTitle(Picture[] _pic){
        pic = _pic;
        this.deleteAll();
        for(int i = 0;i<pic.length;i++){
            Image image = Image.createImage(pic[i].getImg(), 0, pic[i].getImg().length);
            //创建缩略图
            this.append(pic[i].getTitle(), ImageUtil.createThumbnail(image, 40));
        }
    }
    
    public void commandAction(Command cmd,Displayable displayable){
        if(cmd == backCommand){
            pc.back();
        }else if(cmd == List.SELECT_COMMAND){
            int i = this.getSelectedIndex();
            currentPos = i;
            showPicture(i);
        }else if(cmd == nextCommand){
            //循环流览图片
            if(currentPos == this.size()-1){
                currentPos = 0;  
            }else{
                currentPos = currentPos + 1;
            }
            showPicture(currentPos);
        }else if(cmd == listCommand){
            pc.setCurent(this);
        }
    }
    
    private void showPicture(int i){
        //显示图片
        Form form = new Form(pic[i].getTitle());
        form.append(Image.createImage(pic[i].getImg(), 0, pic[i].getImg().length));
        form.addCommand(nextCommand);
        form.addCommand(listCommand);
        form.setCommandListener(this);
        pc.setCurent(form);
    }
}