listcheckbox.java

Java ME手机应用开发大全一书的配套光盘上的源码

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class ListCheckBox extends MIDlet implements CommandListener
{
  private Display display; 
  private Command exit; 
  private Command submit; 
  private List list; 
  public ListCheckBox()
  {
    display = Display.getDisplay(this);
    list = new List("您获取信息的途径是", List.MULTIPLE);
    list.append("电视", null);
    list.append("报纸", null);
    list.append("网络", null);  
    list.append("广播", null);  
    exit = new Command("Exit", Command.EXIT, 1);
    submit = new Command("Submit", Command.SCREEN,2);
    list.addCommand(exit);
    list.addCommand(submit);
    list.setCommandListener(this);   
  }
  public void startApp()
  {
    display.setCurrent(list);
  }
  public void pauseApp()
  { 
  }
  public void destroyApp(boolean unconditional)
  { 
  }
  public void commandAction(Command command, Displayable Displayable)
  {
    if (command == submit)
    {
      boolean choice[] = new boolean[list.size()];
      StringBuffer message = new StringBuffer();
      list.getSelectedFlags(choice);
      for (int x = 0; x < choice.length; x++)
      {
        if (choice[x])
        {
          message.append(list.getString(x));
          message.append(" ");
        }
      }
      Alert alert = new Alert("拟提交的选项是：", message.toString(), 
                               null, null);
      alert.setTimeout(Alert.FOREVER);
      alert.setType(AlertType.INFO);
      display.setCurrent(alert);      
      list.removeCommand(submit);
    }
    else if (command == exit)
    {
      destroyApp(false);  
      notifyDestroyed();
    }
  }
}