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ListDemo.java
资源名称：J2ME&Game.rar　[点击查看]
上传用户：gyyuli
上传日期：2013-07-09
资源大小：3050k
文件大小：5k
源码类别：

J2ME

开发平台：

Java

ListDemo.java：源码内容
  3. import javax.microedition.lcdui.*;
  4. import javax.microedition.midlet.MIDlet;
  6. public class ListDemo
  7.     extends MIDlet
  8.     implements CommandListener {
  9.     private final static Command CMD_EXIT =
  10.     new Command("Exit", Command.EXIT, 1);
  11.     private final static Command CMD_BACK =
  12.     new Command("Back", Command.BACK, 1);
  13.     private Display display;
  14.     private List mainList;
  15.     private List exclusiveList;
  16.     private List implicitList;
  17.     private List multipleList;
  18.     
  19.     private boolean firstTime;
  21.     public ListDemo() {
  22.         display = Display.getDisplay(this);
  23.         System.out.println(display.getBestImageHeight(Display.LIST_ELEMENT));
  24.         System.out.println(display.getBestImageWidth(Display.LIST_ELEMENT));
  26.         // these are the strings for the choices.
  27.         String[] stringArray = {
  28.             "Option A", 
  29.             "Option B", 
  30.             "Option C", 
  31.             "Option D"
  32.         };
  34.         // the string elements will have no images
  35.         Image[] imageArray = null;
  36.                     try {
  37.                 // load the duke image to place in the image array
  38.                 Image img = Image.createImage("/option.png");
  39.     
  40.     
  41.                 // these are the images and strings for the choices.
  42.                 imageArray = new Image[] {
  43.                     img, 
  44.                     img, 
  45.                     img,
  46.                     img
  47.                 };
  48.             } catch (java.io.IOException err) {
  49.                 // ignore the image loading failure the application can recover.
  50.             }
  53.         /*
  54.  * create samples of the supported types:
  55.          *      "Exclusive", "Implicit" and  "Multiple"
  56.  */
  58.         exclusiveList = new List("Exclusive", Choice.EXCLUSIVE, stringArray, 
  59.                                  imageArray);
  60.         exclusiveList.addCommand(CMD_BACK);
  61.         exclusiveList.addCommand(CMD_EXIT);
  62.         exclusiveList.setCommandListener(this);
  64.         implicitList = new List("Implicit", Choice.IMPLICIT, stringArray, 
  65.                                 imageArray);
  66.         implicitList.addCommand(CMD_BACK);
  67.         implicitList.addCommand(CMD_EXIT);
  68.         implicitList.setCommandListener(this);
  70.         multipleList = new List("Multiple", Choice.MULTIPLE, stringArray, 
  71.                                 imageArray);
  72.         multipleList.addCommand(CMD_BACK);
  73.         multipleList.addCommand(CMD_EXIT);
  74.         multipleList.setCommandListener(this);
  75.         
  76.         firstTime = true;
  77.     }
  79.     protected void startApp() {
  80.         if (firstTime) {
  81.             // these are the images and strings for the choices.
  82.             Image[] imageArray = null;
  83.     
  84.             try {
  85.                 // load the duke image to place in the image array
  86.                 Image icon = Image.createImage("/Icon.png");
  87.     
  88.     
  89.                 // these are the images and strings for the choices.
  90.                 imageArray = new Image[] {
  91.                     icon, 
  92.                     icon, 
  93.                     icon
  94.                 };
  95.             } catch (java.io.IOException err) {
  96.                 // ignore the image loading failure the application can recover.
  97.             }
  98.     
  99.             String[] stringArray = {
  100.                 "Exclusive", 
  101.                 "Implicit", 
  102.                 "Multiple"
  103.             };
  104.             mainList = new List("Choose type", Choice.IMPLICIT, stringArray, 
  105.                                 imageArray);
  106.             mainList.addCommand(CMD_EXIT);
  107.             mainList.setCommandListener(this);
  108.             display.setCurrent(mainList);
  109.             firstTime = false;
  110.         }
  111.     }
  113.     protected void destroyApp(boolean unconditional) {
  114.     }
  116.     protected void pauseApp() {
  117.     }
  119.     public void commandAction(Command c, Displayable d) {
  120.         if (d.equals(mainList)) {
  121.             // in the main list
  122.             if (c == List.SELECT_COMMAND) {
  123.                 if (d.equals(mainList)) {
  124.                     switch (((List)d).getSelectedIndex()) {
  125.                         case 0:
  126.                             display.setCurrent(exclusiveList);
  128.                             break;
  130.                         case 1:
  131.                             display.setCurrent(implicitList);
  133.                             break;
  135.                         case 2:
  136.                             display.setCurrent(multipleList);
  138.                             break;
  139.                     }
  140.                 }
  141.             }
  142.         } else {
  143.             // in one of the sub-lists
  144.             if (c == CMD_BACK) {
  145.                 display.setCurrent(mainList);
  146.             }
  147.         }
  148.         if (c == CMD_EXIT) {
  149.             destroyApp(false);
  150.             notifyDestroyed();
  151.         }
  152.     }
  153. }