textfieldwithitemstatelistenermidlet.java

JAVA自学

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class TextFieldWithItemStateListenerMIDlet extends MIDlet
implements ItemStateListener
{
        private Display display;
        public TextFieldWithItemStateListenerMIDlet()
        {
                display = Display.getDisplay(this);
        }
        TextField name ;
        TextField tel ;
        TextField summary ;
        public void startApp()
        {
                Form f = new Form("TextField测试") ;

                name = new TextField("姓名","",8,TextField.ANY) ;
                tel = new TextField("电话","",14,TextField.PHONENUMBER) ;
                summary = new TextField("总结","",30,TextField.UNEDITABLE) ;

                f.append(name) ;
                f.append(tel) ;
                f.append(summary) ;
                f.setItemStateListener(this);
                display.setCurrent(f);
        }
        public void itemStateChanged(Item item)
        {
                if(item==name)
                {
                        summary.setString("输入的姓名为："+name.getString());
                }else if(item==tel)
                {
                        summary.setString("输入的电话为："+tel.getString());
                }else
                {
                       summary.setString("");
                }
        }
        public void pauseApp()
        {
        }
        public void destroyApp(boolean unconditional)
        {
        }
}