choicegroup_midlet.java

本光盘是《J2ME无线移动游戏开发》一书的配套光盘

package ch04;

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

public class ChoiceGroup_MIDlet
    extends MIDlet {

  /*
      1.构造器
   */
  public ChoiceGroup_MIDlet() {

    Form frm = new Form("ChoiceGroup界面组件");
    Display display = Display.getDisplay(this);
    display.setCurrent(frm);

    frm.append("不带图标选择组");
    Image aimage = null, bimage = null, cimage = null;
    try {
      aimage = Image.createImage("/icons/background/star.png");
      bimage = Image.createImage("/icons/background/hand.png");
      cimage = Image.createImage("/icons/background/boot.png");
    }
    catch (Exception e) {
      System.out.println(e.getMessage());
    }

    Image[] imageArray = {
        aimage, bimage, cimage};

    String[] stringArray = {
        "选项A", "选项B", "选项C"};

    //无图标单选组
    ChoiceGroup radioChoiceGroup = new ChoiceGroup("单选组",
        ChoiceGroup.EXCLUSIVE);
    for (int i = 0; i < stringArray.length; i++) {
      radioChoiceGroup.append(stringArray[i], null);
    }
    frm.append(radioChoiceGroup);

    //无图标复选组
    ChoiceGroup mutilChoiceGroup = new ChoiceGroup("复选组",
        ChoiceGroup.MULTIPLE);
    for (int i = 0; i < stringArray.length; i++) {
      mutilChoiceGroup.insert(i, stringArray[i], null);
      mutilChoiceGroup.setSelectedIndex(i, true);
    }
    frm.append(mutilChoiceGroup);

    frm.append("带图标选择组");
    ChoiceGroup[] groups = {
        new ChoiceGroup("带图标单选组",
                        ChoiceGroup.EXCLUSIVE,
                        stringArray,
                        imageArray),
        new ChoiceGroup("带图标复选组",
                        ChoiceGroup.MULTIPLE,
                        stringArray,
                        imageArray)
    };
    for (int iter = 0; iter < groups.length; iter++) {
      frm.append(groups[iter]);
    }

  }

  //启动应用程序
  public void startApp() {
  }

  //挂起应用程序
  public void pauseApp() {
  }

  //撤销应用程序
  public void destroyApp(boolean unconditional) {
  }

}