chatmidlet.java

J2ME MIDP_Example_Applications

//
// Copyright 2002 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
// license, express or implied, by estoppel or otherwise, to any other
// intellectual property rights is granted herein.
//


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


public class ChatMIDlet
     extends MIDlet
     implements IncomingTextMessageListener,
                OutgoingTextMessageListener,
                CommandListener
{
    private final static PhoneBook phoneBook = PhoneBook.getPhoneBook();

    private static SmsHandler smsHandler = null;
    private String port = null;
    private ChatScreen chatScreen = null;
    private WriteMessageScreen writeMessageScreen = null;
    private PeerList peerList = null;
    private PeerScreen peerScreen = null;
    private String phoneNumbers[];
    private String prompt;


    public ChatMIDlet()
    {
    }


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

        if (current == null)
        {
            if (setSmsHandler())
            {
                InputNameScreen inputNameScreen =
                    new InputNameScreen(this);

                Display.getDisplay(this).setCurrent(inputNameScreen);
            }
            else
            {
                Form quitScreen = new Form("Error");

                quitScreen.append("Neither WMA nor " +
                                  "Nokia SMS API is available!");
                quitScreen.addCommand(new Command("Quit", Command.EXIT, 2));
                quitScreen.setCommandListener(this);
                Display.getDisplay(this).setCurrent(quitScreen);
            }
        }
        else
        {
            Display.getDisplay(this).setCurrent(current);
        }
    }


    private boolean setSmsHandler()
    {
        port = getAppProperty("Default-Port");

        try
        {
            Class.forName("javax.wireless.messaging.Message");
            smsHandler =
                (SmsHandler) Class.forName("WmaSmsHandler").newInstance();
        }
        catch (Exception e)
        {
        }

        if (smsHandler == null)
        {
            try
            {
                Class.forName("com.nokia.mid.messaging.Message");
                smsHandler =
                    (SmsHandler) Class.forName("NokiaSmsHandler").newInstance();
            }
            catch (Exception e)
            {
            }

            String attr = getAppProperty("Nokia-SMS-Handler-1");

            if (attr != null)
            {
                port = attr.substring(attr.indexOf(':') + 4,
                    attr.indexOf(','));
            }
        }

        return (smsHandler != null);
    }


    public void commandAction(Command c, Displayable d)
    {
        exitRequested();
    }



    // InputNameScreen Callbacks

    void inputNameScreenDone(String chatName)
    {
        if (smsHandler != null)
        {
            ErrorScreen.init(null, Display.getDisplay(this));

            smsHandler.init(this, this, port);

            prompt = "<" + chatName + ": ";

            chatScreen = new ChatScreen(this, prompt);
            Display.getDisplay(this).setCurrent(chatScreen);
        }
        else
        {
            exitRequested();
        }
    }


    void inputNameScreenQuit()
    {
        exitRequested();
    }


    // ChatScreen Callbacks

    void chatScreenChoosePeer()
    {
        choosePeer();
    }


    void chatScreenWriteMessage()
    {
        writeMessage(null);
    }


    void chatScreenQuit()
    {
        exitRequested();
    }


    private void choosePeer()
    {
        String[] peerNames = phoneBook.getNames();

        if (peerNames != null)
        {
            if (peerList == null)
            {
                peerList = new PeerList(this, peerNames);
            }
            else
            {
                peerList.init(peerNames);
            }
            Display.getDisplay(this).setCurrent(peerList);
        }
        else
        {
            updatePhoneBook(null);
        }
    }


    private void updatePhoneBook(String name)
    {
        if (peerScreen == null)
        {
            peerScreen = new PeerScreen(this);
        }

        String phoneNumber = (name == null) ?
                             null : phoneBook.getPhoneNumber(name);

        peerScreen.init(name, phoneNumber);
        Display.getDisplay(this).setCurrent(peerScreen);
    }


    private void writeMessage(String[] peerNames)
    {
        if (writeMessageScreen == null)
        {
            writeMessageScreen = new WriteMessageScreen(this);
        }

        if (peerNames == null)
        {
            peerNames = phoneBook.getNames(phoneNumbers);
        }
        writeMessageScreen.setTitle(peerNames);
        Display.getDisplay(this).setCurrent(writeMessageScreen);
    }


    // PeerList screen Callbacks

    void peerListBack()
    {
        Display.getDisplay(this).setCurrent(chatScreen);
    }


    void peerListEdit(String name)
    {
        updatePhoneBook(name);
    }


    void peerListDone(String[] peerNames)
    {
        if (peerNames != null)
        {
            phoneNumbers = new String[peerNames.length];

            for (int i = phoneNumbers.length - 1; i >= 0; i--)
            {
                phoneNumbers[i] = phoneBook.getPhoneNumber(peerNames[i]);
            }

            chatScreen.enableWriteCommand();
            writeMessage(peerNames);
        }
        else
        {
            Display.getDisplay(this).setCurrent(chatScreen);
        }
    }


    void peerListNew()
    {
        updatePhoneBook(null);
    }


    void peerListRemove(String[] names)
    {
        phoneBook.removeEntries(names);
    }


    // PeerScreen callbacks

    void peerScreenDone(String name, String phoneNumber)
    {
        phoneBook.update(name, phoneNumber);
        choosePeer();
    }


    void peerScreenBack()
    {
        if (peerList != null && peerList.size() > 0)
        {
            Display.getDisplay(this).setCurrent(peerList);
        }
        else
        {
            Display.getDisplay(this).setCurrent(chatScreen);
        }
    }


    // WriteMessageScreen callbacks

    void writeMessageScreenDone(String content)
    {
        Display.getDisplay(this).setCurrent(chatScreen);

        if (content != null)
        {
            String message = prompt + content;

            chatScreen.update(message);
            smsHandler.sendMessage(phoneNumbers, message);
        }
    }


    void writeMessageScreenBack()
    {
        Display.getDisplay(this).setCurrent(chatScreen);
    }


    // IncomingTextMessageListener interface methods

    public void handleIncomingMessage(String phoneNumber, String content)
    {
        String fromName = content.substring(1, content.indexOf(':'));

        fromName = phoneBook.validate(fromName, phoneNumber);

        chatScreen.update(">" + content.substring(1));
        chatScreen.enableWriteCommand();

        if (Display.getDisplay(this).getCurrent() != writeMessageScreen)
        {
            phoneNumbers = new String[1];
            phoneNumbers[0] = phoneNumber;
        }
    }


    public void handleIncomingError(String errorStr)
    {
        ErrorScreen.showError(errorStr);
    }


    // OutgoingTextMessageListener interface methods

    public void handleOutgoingOk(OutgoingTextMessage message)
    {
    }


    public void handleOutgoingCancel(OutgoingTextMessage message,
        String type)
    {
        writeMessageScreen.setTitle(type);
    }


    public void handleOutgoingError(OutgoingTextMessage message,
        String errorStr)
    {
        ErrorScreen.showError(errorStr);
    }


    // MIDlet methods

    public void pauseApp()
    {
    }


    public void destroyApp(boolean unconditional)
    {
    }


    // A convienence method for exiting.

    void exitRequested()
    {
        if (smsHandler != null)
        {
            smsHandler.abort();
        }

        destroyApp(true);
        notifyDestroyed();
    }
}