choicegroup_menu.java

多类型ChoiceGroups应用程序说明: 多类型ChoiceGroups应用程序实现了J2ME手机程序编程中多种类型ChoiceGroups的操作和应用

/**源代码由程序员联合开发网(www.pudn.com)会员"周润发"收集、整理、重新编辑
 *Email: [e-mail]
 *QQ号：1103798882
 *欢迎大家与我联系互相交流学习 
 **/
package ChoiceGroup_package;

import java.io.IOException;

import javax.microedition.lcdui.Choice;
import javax.microedition.lcdui.ChoiceGroup;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.ItemStateListener;
import javax.microedition.lcdui.StringItem;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class ChoiceGroup_menu extends MIDlet implements CommandListener,ItemStateListener {	
	private Display display;  //(ctrl+shift+O)导入需要的包
	 private Form myform;
	 
	 Command exit = new Command("Exit", Command.EXIT, 1);
	 
	 //声名三个ChoiceGroup
	 private ChoiceGroup myExclusiveChoiceGroup;
	 private ChoiceGroup myMultipleChoiceGroup;
	 private ChoiceGroup mypopChoiceGroup;
	 //通过StringItem将选中的信息显示出来
	 private StringItem myChoice;
	 private Image img=null;
	 //构造方法


	public ChoiceGroup_menu() {
		// TODO Auto-generated constructor stub
		 //初始化
		  display=Display.getDisplay(this);
		  myChoice=new StringItem("你选择的内容是：",null);
		  myform=new Form("ChoiceGrop实例测试");
		  try {
		   img=Image.createImage("/test.png");
		  } catch (IOException e) {
		   img=null;
		  }
		  //采用2个参数的构造方法创建ChoiceGroup对象，类型是单选按钮
		  myExclusiveChoiceGroup=new ChoiceGroup("选择性别",Choice.EXCLUSIVE);
		  myExclusiveChoiceGroup.append("男", img);
		  myExclusiveChoiceGroup.append("女", img);
		  //采用4个参数的构造方法创建ChoiceGroup对象，类型是多选按钮
		  String [] schoolType={
		    "中北大学",
		    "石油大学",
		    "青岛大学",
		    "海洋大学"
		  };
		  Image[] imageElements=new Image[4];
		  try {
		   imageElements[0]=Image.createImage("/school1.png");
		   imageElements[1]=Image.createImage("/school2.png");
		   imageElements[2]=Image.createImage("/school3.png");
		   imageElements[3]=Image.createImage("/school4.png");
		  } catch (IOException e) {
		   imageElements[0]=null;
		   imageElements[1]=null;
		   imageElements[2]=null;
		   imageElements[3]=null;
		  }
		  myMultipleChoiceGroup=new ChoiceGroup("选择学校",Choice.MULTIPLE,schoolType,imageElements);
		  
		  //采用2个参数的构造方法创建ChoiceGroup对象，类型是弹出式
		  mypopChoiceGroup=new ChoiceGroup("选择婚姻状况",Choice.POPUP);
		  mypopChoiceGroup.append("已婚", null);
		  mypopChoiceGroup.append("未婚", null);
		  
		  //将Item对象添加的form中进行显示
		  myform.append(myExclusiveChoiceGroup);
		  myform.append(myMultipleChoiceGroup);
		  myform.append(mypopChoiceGroup);
		  myform.append(myChoice);
		  //注册监听
		  myform.setItemStateListener(this);
	}

	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub

	}

	protected void pauseApp() {
		// TODO Auto-generated method stub

	}

	protected void startApp() throws MIDletStateChangeException {
		// TODO Auto-generated method stub
		display.setCurrent(myform);
	}

	public void commandAction(Command c, Displayable d) {
        if (c == exit) {
            try {
				destroyApp(false);
			} catch (MIDletStateChangeException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
            notifyDestroyed();
        }
    }

	public void itemStateChanged(Item item) {
		  //下面代码是测试，对应的各个ChoiceGroup被改变时，将其显示通过StringItem显示出来
		   /*if(item==myExclusiveChoiceGroup){
		   int index=myExclusiveChoiceGroup.getSelectedIndex();
		   myChoice.setText("\n"+myExclusiveChoiceGroup.getString(index)+"\n");
		  }
		  if(item==myMultipleChoiceGroup){
		   String tmp="\n";
		   for(int i=0;i<myMultipleChoiceGroup.size();i++){
		    boolean index=myMultipleChoiceGroup.isSelected(i);
		    if(index){
		     tmp=tmp+myMultipleChoiceGroup.getString(i)+"\n";
		    }
		   }
		   myChoice.setText(tmp);
		  }
		  if(item==mypopChoiceGroup){
		   int index=mypopChoiceGroup.getSelectedIndex();
		   myChoice.setText("\n"+mypopChoiceGroup.getString(index)+"\n");
		  }*/
		  
		  //下面代码实现的功能：当发生变化时，将所有选择信息显示在myform的mychoice中
		  myChoice.setText("\n");
		  int index=myExclusiveChoiceGroup.getSelectedIndex();
		  myChoice.setText(myChoice.getText()+myExclusiveChoiceGroup.getString(index)+"\n");
		  String tmp="";
		  for(int i=0;i<myMultipleChoiceGroup.size();i++){
		   boolean index1=myMultipleChoiceGroup.isSelected(i);
		   if(index1){
		    tmp=tmp+myMultipleChoiceGroup.getString(i)+"\n";
		   }
		  }
		  myChoice.setText(myChoice.getText()+tmp);
		  int index2=mypopChoiceGroup.getSelectedIndex();
		  myChoice.setText(myChoice.getText()+mypopChoiceGroup.getString(index2)+"\n");
		 }


}