translatormidlet.java

J2ME MIDP_Example_Applications

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


public class TranslatorMIDlet
    extends MIDlet
{   
    private final Image logo;
    private final TranslatorScreen translatorScreen;
    private final SettingsScreen settingsScreen;

    private HttpPoster httpPoster = null;


    public TranslatorMIDlet()
    {
        translatorScreen = new TranslatorScreen(this);
        settingsScreen = new SettingsScreen(this);

        logo = makeImage("/logo.png");
        ErrorScreen.init(logo, Display.getDisplay(this));
    }
    
    
    HttpPoster getHttpPoster()
    {
        if ((httpPoster == null) || httpPoster.isAborting())
        {
            // This example assumes that both the client +
            // server always use UTF-8.   
            httpPoster =
                new HttpPoster(getAppProperty("TranslatorService-URL"));
        }

        return httpPoster;
    }


    public void startApp()
    {
        Displayable current = Display.getDisplay(this).getCurrent();

        if (current == null)
        {
            // first time we've been called
            String text = getAppProperty("MIDlet-Name") + "\n" +
                          getAppProperty("MIDlet-Vendor");
            Alert splashScreen = new Alert(null,
                                           text,
                                           logo,
                                           AlertType.INFO);
            splashScreen.setTimeout(3000);

            // display splash screen, then request screen
            Display.getDisplay(this).setCurrent(splashScreen,
                                                translatorScreen);
        }
        else
        {
            Display.getDisplay(this).setCurrent(current);
        }
    }


    public void pauseApp()
    {
    }


    public void destroyApp(boolean unconditional)
    {
        httpPoster.abort();
    }


    static Image makeImage(String filename)
    {
        Image image = null;

        try
        {
            image = Image.createImage(filename);
        }
        catch (Exception e)
        {
        }
        return image;
    }



    // On the exit command, cleanup and notify that
    // the MIDlet has been destroyed.
    private void quit()
    {
        if (httpPoster != null)
        {
            httpPoster.abort();
        }
        
        destroyApp(false);
        notifyDestroyed();
    }


    // Screen callbacks

    void translatorScreenExit()
    {
        quit();
    }


    void translatorScreenError(String errorMessage)
    {
        ErrorScreen.showError(errorMessage, translatorScreen);
    }
    
    
    void translatorScreenSettings()
    {
        Display.getDisplay(this).setCurrent(settingsScreen);                                                      
    }

    
    void translatorScreenAbortHttpPoster()
    {
        if ((httpPoster != null) && !httpPoster.isAborting())
        {
            // Warning: this kills all pending requests
            httpPoster.abort();
        }
        
        // TranslatorScreen remains displayed
    }
    
    
    void settingsScreenBack()
    {
        Display.getDisplay(this).setCurrent(translatorScreen);
    }
    
    
    void settingsScreenSave(String inputLocale, String outputLocale)
    {
        translatorScreen.setLocales(inputLocale, outputLocale);
        Display.getDisplay(this).setCurrent(translatorScreen);
    }
}