hawkmidlet.java

来自「J2ME MIDP_Example_Applications」· Java 代码 · 共 193 行

// Copyright 2003 Nokia Corporation. 
// 
// THIS SOURCE CODE IS PROVIDED 'AS IS', WITH NO WARRANTIES WHATSOEVER, 
// EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS 
// FOR ANY PARTICULAR PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE 
// OR TRADE PRACTICE, RELATING TO THE SOURCE CODE OR ANY WARRANTY OTHERWISE 
// ARISING OUT OF ANY PROPOSAL, SPECIFICATION, OR SAMPLE AND WITH NO 
// OBLIGATION OF NOKIA TO PROVIDE THE LICENSEE WITH ANY MAINTENANCE OR 
// SUPPORT. FURTHERMORE, NOKIA MAKES NO WARRANTY THAT EXERCISE OF THE 
// RIGHTS GRANTED HEREUNDER DOES NOT INFRINGE OR MAY NOT CAUSE INFRINGEMENT 
// OF ANY PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OWNED OR CONTROLLED 
// BY THIRD PARTIES 
// 
// Furthermore, information provided in this source code is preliminary, 
// and may be changed substantially prior to final release. Nokia Corporation 
// retains the right to make changes to this source code at 
// any time, without notice. This source code is provided for informational 
// purposes only. 
// 
// Nokia and Nokia Connecting People are registered trademarks of Nokia
// Corporation.
// Java and all Java-based marks are trademarks or registered trademarks of
// Sun Microsystems, Inc.
// Other product and company names mentioned herein may be trademarks or
// trade names of their respective owners.
// 
// A non-exclusive, non-transferable, worldwide, limited license is hereby 
// granted to the Licensee to download, print, reproduce and modify the 
// source code. The licensee has the right to market, sell, distribute and 
// make available the source code in original or modified form only when 
// incorporated into the programs developed by the Licensee. No other 
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// intellectual property rights is granted herein.


// unnamed package

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


public class HawkMIDlet
    extends MIDlet
    implements Runnable
{
    private MenuList menuList;
    private InstructionsScreen instructionsScreen;
    private HawkCanvas hawkCanvas;
    private boolean initDone = false;


    public HawkMIDlet()
    {
    }

    
    public void startApp()
    {
        Displayable current = Display.getDisplay(this).getCurrent();
        if (current == null)
        {
            // first time we've been called
            Display.getDisplay(this).setCurrent(new SplashScreen(this));
        }
        else
        {
            if (current == hawkCanvas)
            {
                hawkCanvas.start();
            }
            Display.getDisplay(this).setCurrent(current);
        }
    }


    public void pauseApp()
    {
        Displayable current = Display.getDisplay(this).getCurrent();
        if (current == hawkCanvas)
        {
            hawkCanvas.stop();
        }
    }


    public void destroyApp(boolean unconditional)
    {
        if (hawkCanvas != null)
        {
            hawkCanvas.stop();   // kill its animation thread
        }
    }


    private void quit()
    {
        destroyApp(false);
        notifyDestroyed();
    }


    public void run()
    {
        init();
    }


    private synchronized void init()
    {
        if (!initDone)
        {
            menuList = new MenuList(this);
            hawkCanvas = new HawkCanvas(this);
            initDone = true;
        }
    }


    void splashScreenPainted()
    {
        new Thread(this).start();  // start background initialization
    }


    void splashScreenDone()
    {
        init();   // if not already done
        Display.getDisplay(this).setCurrent(menuList);
    }


    void menuListContinue()
    {
        Display.getDisplay(this).setCurrent(hawkCanvas);
        hawkCanvas.start();
    }


    void menuListNewGame()
    {
        hawkCanvas.init();
        Display.getDisplay(this).setCurrent(hawkCanvas);
        hawkCanvas.start();
    }


    void menuListInstructions()
    {
        if (instructionsScreen == null)
        {
            instructionsScreen = new InstructionsScreen(this);
        }
        Display.getDisplay(this).setCurrent(instructionsScreen);
    }


    void menuListQuit()
    {
        quit();
    }


    void hawkCanvasMenu()
    {
        hawkCanvas.stop();
        menuList.setGameActive(true);
        Display.getDisplay(this).setCurrent(menuList);
    }


    void instructionsBack()
    {
        Display.getDisplay(this).setCurrent(menuList);
    }


    // method needed by lots of classes, shared by putting it here
    static Image createImage(String filename)
    {
        Image image = null;
        try
        {
            image = Image.createImage(filename);
        }
        catch (java.io.IOException e)
        {
            // just let return value be null
        }
        return image;
    }
}