guitests.java

手机游戏设计一书的源代码

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

public class GuiTests extends MIDlet implements CommandListener {
//显示管理器
Display display = null;

//菜单列表对象
List menu = null; // 主菜单

    // 选择框列表对象
    List choose = null;

    // 文本框对象
    TextBox input = null;

    // 时钟对象
    Ticker ticker = new Ticker("Test GUI Components");

    // 警报对象
    final Alert soundAlert = new Alert("sound Alert");

    // 日期对象
    DateField date = new DateField("Today's date: ", DateField.DATE);

    // 表单对象
    Form form = new Form("Form for Stuff");

    // 信息标尺对象
    Gauge gauge = new Gauge("Gauge Label", true, 10, 0);

    // 文本对象
    TextField textfield = new TextField("TextField Label", "abc", 50, 0);

    // 命令对象
    static final Command backCommand = new Command("Back", Command.BACK, 0);
    static final Command mainMenuCommand = new Command("Main", Command.SCREEN, 1);
    static final Command exitCommand = new Command("Exit", Command.STOP, 2);
    String currentMenu = null;

    // 构造器.
    public GuiTests() {
    }

    /**
     * 启动这个MIDlet并且创建一个与exit命令对象相关连的菜单列表
     */
    public void startApp() throws MIDletStateChangeException {
      display = Display.getDisplay(this);

      menu = new List("Test Components", Choice.IMPLICIT);
      menu.append("Test TextBox", null);
      menu.append("Test List", null);
      menu.append("Test Alert", null);
      menu.append("Test Date", null);
      menu.append("Test Form", null);
      menu.addCommand(exitCommand);
      menu.setCommandListener(this);
      menu.setTicker(ticker);

      mainMenu();
    }

    public void pauseApp() {
      display = null;
      choose = null;
      menu = null;
      ticker = null;
      form = null;
      input = null;
      gauge = null;
      textfield = null;
    }

    public void destroyApp(boolean unconditional) {
      notifyDestroyed();
    }

//主菜单方法
void mainMenu() {
      display.setCurrent(menu);
      currentMenu = "Main";
    }

    /**
     *  测试文本框组件.
     */
    public void testTextBox() {
      System.out.println("textbox called");
      input = new TextBox("Enter Some Text:", "", 5, TextField.ANY);
      input.setTicker(new Ticker("testTextBox"));
      input.addCommand(backCommand);
      input.setCommandListener(this);
      input.setString("");
      display.setCurrent(input);
      currentMenu = "input";
    }

    /**
     *  测试list组件.
     */
    public void testList() {
        choose = new List("Choose Items", Choice.MULTIPLE);
        choose.setTicker(new Ticker("listTest"));
        choose.addCommand(backCommand);
        choose.setCommandListener(this);
        choose.append("Item 1", null);
        choose.append("Item 2", null);
        choose.append("Item 3", null);
        display.setCurrent(choose);
        currentMenu = "list";
   }

   /**
    * 测试 Alert 组件.
    */
   public void testAlert() {
      soundAlert.setType(AlertType.ERROR);
      soundAlert.setString("** ERROR **");
      display.setCurrent(soundAlert);
   }

   /**
    * 测试 DateField 组件.
    */
   public void testDate() {
      java.util.Date now = new java.util.Date();
      date.setDate(now);
      Form f = new Form("Today's date");
      f.append(date);
      f.addCommand(backCommand);
      f.setCommandListener(this);
      display.setCurrent(f);
      currentMenu = "date";
   }

   /**
    * 测试 Form 组件.
    */
   public void testForm() {
      form.append(gauge);
      form.append(textfield);
      form.addCommand(backCommand);
      form.setCommandListener(this);
      display.setCurrent(form);
      currentMenu = "form";
   }

   /**
    * 处理命令事件.
    */
   public void commandAction(Command c, Displayable d) {
      String label = c.getLabel();
      if (label.equals("Exit")) {
         destroyApp(true);
      } else if (label.equals("Back")) {
          if(currentMenu.equals("list") || currentMenu.equals("input") ||
               currentMenu.equals("date") || currentMenu.equals("form")) {
            // 回到菜单
            mainMenu();
          }

      } else {
         List down = (List)display.getCurrent();
         switch(down.getSelectedIndex()) {
           case 0: testTextBox();break;
           case 1: testList();break;
           case 2: testAlert();break;
           case 3: testDate();break;
           case 4: testForm();break;
         }

      }
  }
}