j2me的短息发送改进版

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

public class Midlet1 extends MIDlet implements CommandListener {

 private Display dis;
 /************ 歡迎介面 ***********/
 private Form main;
 private Command cmd_exit;
 private Command cmd_wMsg;
 /************ 短信編輯介面 ***********/
 private TextBox tbMsg;
 private Command cmd_back;
 private Command cmd_cancle;
 private Command cmd_Yes;
 /************ 發送介面 ***********/
 private TextBox tbPhone;
 private Command cmd_send;
 private Command cmd_PhoneBack;

 public Midlet1() {
  dis = Display.getDisplay(this);
  /************ 歡迎介面 ***********/
  cmd_exit = new Command("退出", Command.BACK, 1);
  cmd_wMsg = new Command("寫短信", Command.SCREEN, 1);
  main = new Form("歡迎你");
  /************ 短信編輯介面 ***********/
  tbMsg = new TextBox("短信編輯", "", 255, TextField.ANY);
  cmd_back = new Command("返回", Command.BACK, 1);
  cmd_cancle = new Command("取消", Command.BACK, 1);
  cmd_send = new Command("发送", Command.SCREEN, 1);
  /************ 發送介面 ***********/
  tbPhone = new TextBox("電話號碼：", "", 11, TextField.NUMERIC);
  cmd_Yes = new Command("確定", Command.SCREEN, 1);
  cmd_PhoneBack = new Command("取消", Command.BACK, 1);

 }

 protected void startApp() throws MIDletStateChangeException {
  /************ 歡迎介面 ***********/
  main.addCommand(cmd_exit);
  main.addCommand(cmd_wMsg);
  dis.setCurrent(main);
  main.setCommandListener(this);
  /************ 短信編輯介面 ***********/
  tbMsg.addCommand(cmd_back);
  tbMsg.addCommand(cmd_send);
  tbMsg.setCommandListener(this);
  /************ 發送介面 ***********/
  tbPhone.addCommand(cmd_Yes);
  tbPhone.addCommand(cmd_PhoneBack);
  tbPhone.setCommandListener(this);

  dis.setCurrent(main);

 }

 protected void destroyApp(boolean arg0) throws MIDletStateChangeException {

 }

 protected void pauseApp() {

 }

 public void commandAction(Command arg0, Displayable arg1) {

  if (arg0 == cmd_exit) {
   this.notifyDestroyed();
  } else if (arg0 == cmd_wMsg) {
   dis.setCurrent(tbMsg);
  } else if (arg0 == cmd_back) {
   dis.setCurrent(main);
  } else if (arg0 == cmd_send) {
   dis.setCurrent(tbPhone);
  } else if (arg0 == cmd_PhoneBack) {
   dis.setCurrent(tbMsg);
  } else if (cmd_Yes == arg0) {
   System.out.println("短息成功发送");
   System.out.println("目的地：" + tbPhone.getString());
   System.out.println("短息内容：" + tbMsg.getString());
  } else if (cmd_cancle == arg0) {
   int i = tbMsg.getCaretPosition();
   tbMsg.delete(i - 2, 1);
  }

 }

}