midlet2.java

这是郭克华老师的J2ME视频的源代码

package prj6_1;

import javax.microedition.lcdui.Choice;
import javax.microedition.lcdui.ChoiceGroup;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.ItemStateListener;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class MIDlet2 extends MIDlet implements ItemStateListener{
	private Form regForm = new Form("这是一个注册表单");
	private Display dis;
	
	private ChoiceGroup cgSex = new ChoiceGroup("选择性别",Choice.POPUP);
	private TextField tfAcc = new TextField("输入账号","",20,TextField.ANY);
	
	protected void startApp() throws MIDletStateChangeException {
		dis = Display.getDisplay(this);
		dis.setCurrent(regForm);
		
		regForm.append(cgSex);
		cgSex.append("男", null);
		cgSex.append("女", null);
		
		regForm.append(tfAcc);		
		
		regForm.setItemStateListener(this); //注意，将Form和ItemStateListener绑定，不是将Item和ItemStateListener绑定
	}
	public void itemStateChanged(Item item){
		if(item==cgSex){
			String str = cgSex.getString(cgSex.getSelectedIndex());
			regForm.setTitle("当前选择:" + str);
		}
		else if(item==tfAcc){
			regForm.setTitle(tfAcc.getString());
		}
	}
	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub

	}

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

	}

}