快乐无极的博客

本文的源代码下载：

首先，想让大家看看九宫图实现之后的界面：

本文所用的代码，是来自LWUIT所提供的Sample例子，但是对例子做出以下修改：
1.设计自主的res资源文件
2.把builde.xml里面的 。。。。。 删除
3.把所用的res文件放到一个名为res的文件夹，并与源代码放在一起
4.把ResourceBuilder.jar也删除，util文件夹里的ResourceBuilder.jar绝对不能删，是用于设计res文件
针对以上4点，说明一下为什么这么做：
原Sample例子的res文件，是使用util文件夹里的ResourceEdit.exe设计，而且还在builde.xml中使用ResourceBuilder.jar再重新生成一次res文件并与源文件组合，这显然有点冗余，因为直接用ResourceEdit.exe设计的res文件放到源文件目录里即可。也许Sample作者直接使用ANT编译或者是其他IDE要求，本文所用的IDE为netbeans。
OK，接下来就是源代码修改了，Sample源代码可是写得很长很长，要看也得花不少时间，但是，我保证大家看完后一定领略到JAVA大牛的编程功力之深！！！为了方便以后使用，所以我把Sample中实现九宫图和一些小操作的代码保留，其他都去掉了，请JAVA大牛切勿见笑哈。
以下给出关键代码:
/*
* Copyright ? 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
*/
package com.sun.lwuit.uidemo;
import com.sun.lwuit.Button;
import com.sun.lwuit.animations.CommonTransitions;
import com.sun.lwuit.Command;
import com.sun.lwuit.Component;
import com.sun.lwuit.Dialog;
import com.sun.lwuit.Display;
import com.sun.lwuit.Form;
import com.sun.lwuit.Image;
import com.sun.lwuit.Label;
import com.sun.lwuit.animations.Transition;
import com.sun.lwuit.animations.Transition3D;
import com.sun.lwuit.events.ActionEvent;
import com.sun.lwuit.events.ActionListener;
import com.sun.lwuit.events.FocusListener;
import com.sun.lwuit.layouts.GridLayout;
import com.sun.lwuit.plaf.Style;
import com.sun.lwuit.plaf.UIManager;
import com.sun.lwuit.util.Resources;
public class UIDemoMIDlet extends javax.microedition.midlet.MIDlet implements ActionListener {
    private static final Command exitCommand = new Command("Exit", 1);
    private String[] btn_name = new String[]{//九宫图的名称，同时也是图标的名称
    "Image 1","Image 2","Image 3","Image 4","Image 5","Image 6","Image 7",
    "Image 8","Image 9"
    };
    private static Transition componentTransitions;
    private static Form mainMenu;//主窗体
    private int cols;
    private int elementWidth;
    protected void startApp() {
        try {
            Display.init(this);
            Resources r = Resources.open("/res/resources.res");//读取资源文件
            setMainForm(r);
        } catch (Throwable ex) {
            ex.printStackTrace();
            Dialog.show("Exception", ex.getMessage(), "OK", null);//hellogv最爱的提示框弹出方式
        }
    }
    protected void pauseApp() {
    }
    protected void destroyApp(boolean arg0) {
    }
    public static void setMenuTransition(Transition in, Transition out) {
        mainMenu.setMenuTransitions(in, out);
        UIManager.getInstance().getLookAndFeel().setDefaultMenuTransitionIn(in);
        UIManager.getInstance().getLookAndFeel().setDefaultMenuTransitionOut(out);
    }
    public static void setComponentTransition(Transition t) {
        componentTransitions = t;
        mainMenu.setSmoothScrolling(false);
    }
    public static Transition getComponentTransition() {
        return componentTransitions;
    }
    public static void backToMainMenu(){
                mainMenu.refreshTheme();
                mainMenu.show();
                // for series 40 devices
                System.gc();
                System.gc();
    }
    private void setMainForm(Resources r) {
        //设置主题
        UIManager.getInstance().setThemeProps(r.getTheme("businessTheme"));
        mainMenu = new MainScreenForm("LWUIT Demo") ;
        int width = Display.getInstance().getDisplayWidth(); //取得全屏的宽度
        elementWidth = 0;
        //效果，可以实现类似IPhone、S1智能机的Touch Flo的动态窗体切换效果!**********************
        mainMenu.setTransitionOutAnimator(CommonTransitions.createSlide(CommonTransitions.SLIDE_HORIZONTAL, false, 500));
        mainMenu.setTransitionInAnimator(CommonTransitions.createSlide(CommonTransitions.SLIDE_HORIZONTAL, true, 500));
        UIDemoMIDlet.setComponentTransition(Transition3D.createCube(600, false));
        //***************************************************************************************************************
        Image[] selectedImages = new Image[btn_name.length];//按钮被选中时的图片
        Image[] unselectedImages = new Image[btn_name.length];//按钮未被选中的图片
        for (int i = 0; i  
            //---------读取选中时的图片
            selectedImages[i] = r.getImage(btn_name[i]);
            //--------读取未被选中的图片
            unselectedImages[i] = r.getImage(btn_name[i]);
            final Button button = new Button(btn_name[i], unselectedImages[i])
            {
                public Image getPressedIcon() {
                    Image i = getIcon();
                    return i.scaled((int) (i.getWidth() * 0.8), (int) (i.getHeight() * 0.8));
                }
            };
            button.setRolloverIcon(selectedImages[i]);
            Style s = button.getStyle();
            s.setBorder(null);
            s.setBgTransparency(0);
            s.setBgSelectionColor(0xffffff);
            button.setAlignment(Label.CENTER);
            button.setTextPosition(Label.BOTTOM);
            mainMenu.addComponent(button);
            button.addActionListener(this);
            //按钮焦点处理,用于实现按钮特效
            button.addFocusListener(new FocusListener() {
                public void focusGained(Component cmp) {//按钮取得焦点时的特效
                    if (componentTransitions != null) {
                        mainMenu.replace(button, button, componentTransitions);
                    }
                }
                public void focusLost(Component cmp) {}//按钮失去焦点时的特效
            });
            elementWidth = Math.max(button.getPreferredW(), elementWidth);
        }
        cols = width / elementWidth;
        int rows = btn_name.length / cols;
        mainMenu.setLayout(new GridLayout(rows, cols));//GridLayout为九宫图的排列方式
        mainMenu.addCommand(exitCommand);
        mainMenu.setCommandListener(this);
        mainMenu.show();
    }
    /**
     * 控件处理函数
     */
    public void actionPerformed(ActionEvent evt) {
        try{//通过异常处理来判断事件来源
            Command cmd = evt.getCommand();
            if(cmd.getCommandName().equals("Exit"))
                    notifyDestroyed();
        }catch(Exception e)
        {
            String sel_button=((Button)(evt.getSource())).getText();//取得所选按钮的名称
            if(sel_button.equals("Image 1"))
               new AnimationDemo().form.show();
            else if(sel_button.equals("Image 2"))
                new PaintingDemo().form.show();
            else if(sel_button.equals("Image 3"))
                new LayoutDemo().form.show();
        }
    }
}
好了，本文就介绍到这里，关于J2ME LWUIT的摸索还在继续，希望大家多多支持LWUIT，让它越做越好！
(本文来自：http://blog.csdn.net/hellogv/ ，转载必须注明出处！)