midlet1.java

这是郭克华老师的J2ME视频的源代码

package prj6_1;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.ItemCommandListener;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class MIDlet1 extends MIDlet implements ItemCommandListener{
	private Form regForm = new Form("这是一个注册表单");
	private Display dis;
	private TextField tfAcc = new TextField("输入账号","",20,TextField.ANY);
	private TextField tfPass = new TextField("输入密码","",20,TextField.PASSWORD);
	private Command cmdDel = new Command("清除内容",Command.ITEM,1);
	
	protected void startApp() throws MIDletStateChangeException {
		dis = Display.getDisplay(this);
		dis.setCurrent(regForm);
		
		regForm.append(tfAcc);
		regForm.append(tfPass);
		
		tfAcc.addCommand(cmdDel);//STEP1:命令按钮添加到Item上
		tfPass.addCommand(cmdDel);
		
		tfAcc.setItemCommandListener(this);//STEP2:Item和Listener绑定
		tfPass.setItemCommandListener(this);
	}
	
	public void commandAction(Command c,Item i){
		if(c==cmdDel){
			TextField tf = (TextField)i;
			System.out.println("当前命令从" + tf.getLabel() + "发出");
			int position = tf.getCaretPosition();
			tf.delete(position-1, 1);
		}
		
	}
	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub

	}

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

	}

}