imagemidlet.java

j2me简单实例,j2me教程加源码,希望大家喜欢

package com.j2medev.chapter3;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class ImageMIDlet extends MIDlet implements CommandListener{
    
    private Display display = null;
    private String[] items = new String[]{"Rotate Image","Scale Image","ARGB Image"};
    private List menu = new List("Image",List.IMPLICIT,items,null);
    public static final Command exitCommand = new Command("Exit",Command.EXIT,1);
    public static final Command backCommand = new Command("Back",Command.BACK,2);
    
    public void startApp() {
        if(display == null){
            display = Display.getDisplay(this);
            menu.addCommand(exitCommand);
            menu.setCommandListener(this);
        }
        display.setCurrent(menu);
    }
    
    public void pauseApp() {
    }
    
    public void destroyApp(boolean unconditional) {
    }
    public void addCommand(Command cmd,Displayable displayable){
        displayable.addCommand(cmd);
        displayable.setCommandListener(this);
    }
    public void commandAction(Command cmd,Displayable displayable){
        if(cmd == exitCommand){
            destroyApp(false);
            notifyDestroyed();
        }else if(cmd.getCommandType()==Command.BACK){
            display.setCurrent(menu);
        }else if(cmd == List.SELECT_COMMAND){
            int index = menu.getSelectedIndex();
            if(index == 0){
                 RotateCanvas canvas = new RotateCanvas();
                 addCommand(backCommand,canvas);
                 display.setCurrent(canvas);
            }else if(index == 1){
               ImageForm form = new ImageForm();
               addCommand(backCommand,form);
               display.setCurrent(form);
            }else if(index == 2){
                ARGBCanvas canvas = new ARGBCanvas();
                addCommand(backCommand,canvas);
                display.setCurrent(canvas);
            }
        }
    }
}