package Prj7_1; import java.io.IOException; 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.ImageItem;import javax.microedition.lcdui.Item;import javax.microedition.lcdui.ItemStateListener;import javax.microedition.lcdui.TextBox;import javax.microedition.lcdui.TextField;import javax.microedition.midlet.MIDlet;import javax.microedition.midlet.MIDletStateChangeException; public class MessageMIDlet extends MIDlet implements CommandListener, ItemStateListener{  private Form welcomeForm = new Form("欢迎使用..."); private Display dis; /**************** 欢迎界面  ********************/ private Command cmdExit = new Command("退出程序",Command.BACK,1); private Command cmdWriteMsg = new Command("写短信",Command.SCREEN,1); ImageItem welcoemItem;   /**************** 短信编辑界面  ********************/ private Form frmMsg = new Form("请您输入短信"); private TextField tfMsg = new TextField("请您输入短信内容","",300,TextField.ANY); private Command cmdMsgBack = new Command("返回上一页",Command.BACK,1); private Command cmdMsgDel = new Command("清除文本",Command.BACK,1); private Command cmdSend = new Command("发送",Command.SCREEN,1);  /**************** 发送界面  ********************/ private TextBox tbPhone =  new TextBox("输入对方号码","",15,TextField.NUMERIC); private Command cmdPhoneBack = new Command("返回",Command.BACK,1); private Command cmdOK = new Command("确定",Command.SCREEN,1);  public MessageMIDlet() {  /****************  欢迎界面初始化  ********************/  Image welcomeImg = null;  try {   welcomeImg = Image.createImage("/Welcome.png");  } catch (IOException e) {   // TODO Auto-generated catch block   e.printStackTrace();  }  welcoemItem = new ImageItem("Welcome!",welcomeImg, Item.LAYOUT_CENTER, "无法载入图片");    /**************** 短信编辑界面初始化  ********************/  frmMsg.append(tfMsg);  frmMsg.addCommand(cmdMsgBack);  frmMsg.addCommand(cmdSend);   /****************  发送界面初始化  ********************/  tbPhone.addCommand(cmdPhoneBack);  tbPhone.addCommand(cmdOK);   /****************  事件绑定代码  ********************/  welcomeForm.setCommandListener(this);  frmMsg.setCommandListener(this);  tbPhone.setCommandListener(this);  frmMsg.setItemStateListener(this);//Item状态事件 }  protected void startApp() throws MIDletStateChangeException {  dis = Display.getDisplay(this);  dis.setCurrent(welcomeForm);  /****************  欢迎界面初始化  ********************/  welcomeForm.addCommand(cmdWriteMsg);  welcomeForm.addCommand(cmdExit);  welcomeForm.append(welcoemItem); }  public void commandAction(Command c,Displayable d){  if(c == cmdExit){   this.notifyDestroyed();  }  else if(c == cmdWriteMsg){   dis.setCurrent(frmMsg);  }  else if(c == cmdMsgBack){   dis.setCurrent(welcomeForm);  }  else if(c == cmdSend){   dis.setCurrent(tbPhone);  }  else if(c == cmdMsgDel){   int position = tfMsg.getCaretPosition();   tfMsg.delete(position-1, 1);  }  else if(c == cmdPhoneBack){   dis.setCurrent(frmMsg);  }  else if(c == cmdOK){  //在cmdPhoneBack命令未添加处理代码时，要放在else if(c == cmdPhoneBack){后面   System.out.println("短信发送成功");   System.out.println("短信发送内容:"+tfMsg.getString());   System.out.println("短信发送目的地： "+tbPhone.getString());  } }  public void itemStateChanged(Item item)  {  if(item == tfMsg){   System.out.println(tfMsg.size());//测试一下输入的短信字符的长度   if(tfMsg.size() ==  0){    frmMsg.removeCommand(cmdMsgDel);    frmMsg.addCommand(cmdMsgBack);   }   else{    frmMsg.removeCommand(cmdMsgBack);    frmMsg.addCommand(cmdMsgDel);   }  } }  protected void destroyApp(boolean arg0) throws MIDletStateChangeException {  }  protected void pauseApp() {  }   }  

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