listmidlet.java

j2me的程序

import java.io.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

// A first MIDlet with simple text and a few commands.
public class ListMIDlet extends MIDlet
		         implements CommandListener{
  TextBox main;

  //The exit, info, and buy commands
  private Command exitCommand;
  private Command exclusiveCommand;
  private Command multipleCommand;
  private Command implicitCommand;
  private Command confirmCommand;

  private List aEXCLUSIVEList;
  private List aMULTIPLEList;
  private List aIMPLICITList;

  String[] position ={"程序设计师","系统分析师","项目经理"};
  String[] hobby = {"阅读","听音乐","看电影","闲聊","逛街"};

  Image[] positionIcon = {createImage("/Sokoban.png"),
                      createImage("/Tiles.png"),
                      createImage("/ManyBalls.png")};

  Image[] hobbyIcon = {createImage("/StarCruiser.png"),
                        createImage("/Stock.png"),
                        createImage("/ManyBalls.png"),
                        createImage("/Tiles.png"),
                        createImage("/Sokoban.png")};

  //The display for this MIDlet
  private Display display;
  private String currentScreen = "";

  public ListMIDlet() {
    display = Display.getDisplay(this);
    exitCommand = new Command("离开", Command.SCREEN, 1);
    exclusiveCommand = new Command("职业",Command.SCREEN, 1);
    multipleCommand = new Command("兴趣",Command.SCREEN, 1);
    implicitCommand = new Command("菜单",Command.SCREEN, 1);
    confirmCommand = new Command("确认",Command.SCREEN,2);

  }

  // Start the MIDlet by creating the TextBox and
  // associating the exit command and listener.
  public void startApp() {
    main=new TextBox("主画面","请按软键选择要运行的目录",256,TextField.ANY);
    main.addCommand(exitCommand);

    main.addCommand(exclusiveCommand);
    main.addCommand(multipleCommand);
    main.addCommand(implicitCommand);

    main.setCommandListener(this);
    display.setCurrent(main);
    currentScreen = "主画面";
  }

  // Pause is a no-op because there are no background
  // activities or record stores to be closed.
  public void pauseApp() { }

  // Destroy must cleanup everything not handled
  // by the garbage collector.
  // In this case there is nothing to cleanup.
  public void destroyApp(boolean unconditional) { }


  private Image createImage(String name){
      Image aImage = null;
      try{
         aImage = Image.createImage(name);
      }
      catch(IOException e){
      }
      return aImage;
 }
 private void exclusiveList(){
	 aEXCLUSIVEList = new List("职业",List.EXCLUSIVE,position,positionIcon);
	 aEXCLUSIVEList.addCommand(exitCommand);
	 aEXCLUSIVEList.addCommand(confirmCommand);
	 aEXCLUSIVEList.setCommandListener(this);
	 display.setCurrent(aEXCLUSIVEList);
	 currentScreen="职业";
 }

 private void multipleList(){
	 aMULTIPLEList = new List("兴趣",List.MULTIPLE,hobby,hobbyIcon);
     aMULTIPLEList.addCommand(exitCommand);
     aMULTIPLEList.addCommand(confirmCommand);
     aMULTIPLEList.setCommandListener(this);
     display.setCurrent(aMULTIPLEList);
	 currentScreen="兴趣";
}

 private void implicitList(){
	 aIMPLICITList = new List("菜单",List.IMPLICIT);
     aIMPLICITList.append("字体",createImage("/Sokoban.png"));
     aIMPLICITList.append("段落",createImage("/Stock.png"));
     aIMPLICITList.append("边框及底纹",createImage("/StarCruiser.png"));
     aIMPLICITList.append("项目符号",createImage("/ManyBalls.png"));
     aIMPLICITList.append("项目编号",createImage("/Tiles.png"));
     aIMPLICITList.addCommand(exitCommand);

     aIMPLICITList.setCommandListener(this);
     display.setCurrent(aIMPLICITList);
	 currentScreen="菜单";
 }

  // Respond to commands. Here we are only implementing
  // the exit command. In the exit command, cleanup and
  // notify that the MIDlet has been destroyed.
  public void commandAction(Command c, Displayable s) {
    if (c == exitCommand) {
	  if(currentScreen=="主画面"){
         destroyApp(false);
         notifyDestroyed();
      }
      else {
            display.setCurrent(main);
            currentScreen="主画面";
      }
    }

    if (c == exclusiveCommand) {
	    exclusiveList();
    }
    if (c == multipleCommand) {
	      multipleList();
    }
    if(c == implicitCommand) {
	     implicitList();
    }
    if(c==confirmCommand){
		   Alert aAlert;

           if(currentScreen=="职业"){
			  int aIndex = aEXCLUSIVEList.getSelectedIndex();
		      aAlert = new Alert("结果",position[aIndex],null,AlertType.INFO);
              display.setCurrent(aAlert);
	       }
	       if(currentScreen=="兴趣"){
			  String result="你的兴趣是：\n";
			  for(int i=0;i<aMULTIPLEList.size();i++)
				  if(aMULTIPLEList.isSelected(i))
				     result += hobby[i] + ", ";
		      aAlert = new Alert("结果",result,null,AlertType.INFO);
		      aAlert.setTimeout(5000);
		      display.setCurrent(aAlert);
		   }
	 }
	if(c==List.SELECT_COMMAND){
		int aIndex = aIMPLICITList.getSelectedIndex();
		String menuItem = aIMPLICITList.getString(aIndex);
		Alert aAlert = new Alert("结果",menuItem,null,AlertType.INFO);
		aAlert.setTimeout(5000);
		display.setCurrent(aAlert);
	}
   }

}