J2ME高级界面实现页面之间的跳转

package  test;

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.Image;
import  javax.microedition.lcdui.List;
import  javax.microedition.midlet.MIDlet;
import  javax.microedition.midlet.MIDletStateChangeException;

/** */ /**
 * 
 * @author leilu
 * 
 */
public   class  MainPage  extends  MIDlet  implements  CommandListener
... {
    // m_cmdExit
    private Command m_cmdExit = null;

    // m_cmdOK
    private Command m_cmdOK = null;

    // Display
    private Display display = null;

    // list
    private List list = null;

    //
    private Image icon = null;

    public MainPage()
    ...{
        super();

    }

    protected void startApp() throws MIDletStateChangeException
    ...{
        // display
        display = Display.getDisplay(this);
        // m_cmdExit
        m_cmdExit = new Command("Exit", Command.EXIT, 1);
        // m_cmdOK
        m_cmdOK = new Command("OK", Command.OK, 1);
        // 创建图像
        try
        ...{
            icon = Image.createImage("/Icon.png");
        }
        catch (IOException e)
        ...{
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        // list
        list = new List("主界面", List.EXCLUSIVE);
        list.append("FirstPage", icon);
        list.append("Secondpage", icon);
        // 增加按钮
        list.addCommand(m_cmdExit);
        list.addCommand(m_cmdOK);
        // 监听
        list.setCommandListener(this);
        // 显示
        display.setCurrent(list);

    }

    protected void pauseApp()
    ...{

    }

    protected void destroyApp(boolean arg0) throws MIDletStateChangeException
    ...{
    }

    public void commandAction(Command c, Displayable d)
    ...{
        String cmd = c.getLabel();
        if (cmd == "OK")
        ...{
            switch (((List) d).getSelectedIndex())
            ...{
            case 0:
                FirstPage first = new FirstPage(display, list);
                display.setCurrent(first);
                break;
            case 1:
                SecondPage second = new SecondPage(display, list);
                display.setCurrent(second);
            default:
                break;
            }
        }
        else if (cmd == "Exit")
        ...{
            try
            ...{
                destroyApp(false);
            }
            catch (MIDletStateChangeException e)
            ...{
                e.printStackTrace();
            }
            notifyDestroyed();

        }
    }

}

 

package  test;

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.List;
import  javax.microedition.lcdui.Ticker;

public   class  FirstPage  extends  Form  implements  CommandListener
... {
    // TICKER_TEXT滚动文字
    private static final String TICKER_TEXT = "这是一个滚动条的例子正在滚动，可以一直滚动除非有触发了停止事件";

    // display
    private Display display;
    //
    private Ticker ticker = null;

    // m_cmdBack
    private Command m_cmdBack = null;
    //list
    private List list= null;

    public FirstPage(Display display,Displayable list)
    ...{
        super("FirstPage");
        //
        this.list = (List)list;
        this.display= display;
        m_cmdBack = new Command("Back", Command.BACK, 1);
        ticker = new Ticker(TICKER_TEXT);
        this.setTicker(ticker);
        //增加图片
        Image icon = null;
        try
        ...{
            icon = Image.createImage("/Java.png");
        }
        catch (IOException e)
        ...{
            e.printStackTrace();
        }
        this.append(icon);
        //增加按钮
        this.addCommand(m_cmdBack);
        this.setCommandListener(this);
        //显示FirstPage
        display.setCurrent(this);

    }

    public void commandAction(Command c, Displayable d)
    ...{
        if (m_cmdBack == c)
        ...{
            display.setCurrent(list);
        }

    }

}

package  test;

import  javax.microedition.lcdui.Alert;
import  javax.microedition.lcdui.AlertType;
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.List;
import  javax.microedition.lcdui.TextField;
public   class  SecondPage  extends  Form  implements  CommandListener
... {
    // display
    private Display display;

    // Back
    private Command m_cmdBack;

    // Alert
    private Command m_cmdAlert;

    // list
    private List list = null;

    public SecondPage(Display display, Displayable list)
    ...{
        super("Second");
        this.display = display;
        this.list = (List) list;
        //
        m_cmdBack = new Command("Back", Command.BACK, 1);
        m_cmdAlert = new Command("Alert", Command.SCREEN, 1);
        this.append(new TextField("E_mail", "lulei@163.com", 15,
                TextField.EMAILADDR));
        // 增加按钮
        this.addCommand(m_cmdBack);
        this.addCommand(m_cmdAlert);
        this.setCommandListener(this);
        // 显示Form屏幕
        display.setCurrent(this);
    }

    public void commandAction(Command c, Displayable d)
    ...{
        if (m_cmdAlert == c)
        ...{
            // 创建要显示的图标

            // 创建一个Alert屏幕对象，要显示的图标为 img
            Alert info = new Alert("This is a Alert Example");
            info.setType(AlertType.INFO);

            // 设置显示时间
            // info.setTimeout(Alert.FOREVER);
            info.setTimeout(3000);
            // 显示Alert屏幕
            display.setCurrent(info);
        }
        if (m_cmdBack == c)
        ...{
            display.setCurrent(list);
        }

    }

}