choosemovieui.java

这个范例程序演示了利用j2me技术开发无线服务器支持的应用。这是一个电影票订购程序

/*
 * Copyright 2001, 2002, 2003 Sun Microsystems, Inc. All Rights Reserved.
 * Except for any files in PNG format (which are marked with the filename
 * extension ".png"), GIF format (which are marked with the filename
 * extension ".gif"), or JPEG format (which are marked with the filename
 * extension ".jpg"), redistribution and use in source and binary forms,
 * with or without modification, are permitted provided that the
 * following conditions are met:
 * - Redistribution of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * - Redistribution in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * You may compile, use, perform and display the following files with
 * original Java Smart Ticket Sample Application code obtained from Sun
 * Microsystems, Inc. only:
 * - files in PNG format and having the ".png" extension
 * - files in GIF format and having the ".gif" extension
 * - files in JPEG format and having the ".jpg" extension
 * You may not modify or redistribute .png, .gif, or .jpg files in any
 * form, in whole or in part, by any means without prior written
 * authorization from Sun Microsystems, Inc. and its licensors, if any.
 * Neither the name of Sun Microsystems, Inc., the 'Java Smart Ticket
 * Sample Application', 'Java', 'Java'-based names, or the names of
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
 * MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
 * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
 * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
 * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
 * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
 * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * You acknowledge that this software is not designed, licensed or
 * intended for use in the design, construction, operation or maintenance
 * of any nuclear facility.
 * $Id: ChooseMovieUI.java,v 1.1 2003/04/05 00:41:51 zull Exp $
 */
package com.sun.j2me.blueprints.smartticket.client.midp.ui;

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import java.io.IOException;
import java.util.Calendar;
import com.sun.j2me.blueprints.smartticket.client.midp.util.Utils;
import com.sun.j2me.blueprints.smartticket.client.midp.model.Preferences;
import com.sun.j2me.blueprints.smartticket.shared.midp.ApplicationException;
import com.sun.j2me.blueprints.smartticket.shared.midp.model.Theater;
import com.sun.j2me.blueprints.smartticket.shared.midp.model.TheaterSchedule;
import com.sun.j2me.blueprints.smartticket.shared.midp.model.Movie;

public class ChooseMovieUI extends Form implements CommandListener, 
        ItemStateListener, ItemCommandListener {
    private UIController uiController;
    private Preferences preferences;
    private final static int THEATERLIST_ITEM_NUM = 1;
    private final static int MOVIESDATE_ITEM_NUM = THEATERLIST_ITEM_NUM + 1;
    private final static int MOVIELIST_ITEM_NUM = MOVIESDATE_ITEM_NUM + 1;
    private final static int SHOWDATELIST_ITEM_NUM = MOVIELIST_ITEM_NUM + 1;
    // num count of monday - sunday, should be 7
    private final static int SHOWDATE_NUM = UIConstants.PREF_DATE_END 
                                            - UIConstants.PREF_DATE_START + 1;
    private Command selectSeatsCommand;
    private Theater[] theaters;
    private TheaterSchedule.MovieSchedule[] movieSchedules;
    private Movie[] movies;
    private int[][] showTimes;
    private String[][] showTimebyDate;
    private ChoiceGroup theaterList;
    private ChoiceGroup movieList;
    private ChoiceGroup showDateList;
    private ChoiceGroup showTimesList;
    private ChoiceGroup seatingPref;
    private TextField numOfTickets;
    private StringItem theaterListLabel;
    private StringItem moviesDate;
    private StringItem movieTimeLabel;
    private StringItem selectSeats;

    public ChooseMovieUI(UIController uiController) {
        super(uiController.getString(UIConstants.CHOOSE_MOVIE_TITLE));

        this.uiController = uiController;

        createItems();

        selectSeatsCommand = 
            new Command(uiController.getString(UIConstants.SELECT_SEATS), 
                        Command.ITEM, 1);

        // the order of items is important for layout
        append(theaterListLabel);
        append(theaterList);
        selectSeats.setDefaultCommand(selectSeatsCommand);
        selectSeats.setItemCommandListener(this);
        setCommandListener(this);
        setItemStateListener(this);
    }

    public void init(Preferences preferences) {
        this.preferences = preferences;

        numOfTickets.setString(String.valueOf(preferences.getDefaultTicketNumber()));
        Utils.setChoiceGroupEntry(uiController, preferences.getFavoriteDay(), 
                                  showDateList);
        Utils.setChoiceGroupEntry(uiController, 
                                  preferences.getFavoriteSeat(), seatingPref);
        // remove all the items in the form except theater list
        cleanItemAfter(THEATERLIST_ITEM_NUM);
    } 

    public void setTheaters(Theater[] allTheaters, 
                            Theater[] downloadedTheaters) {
        if (allTheaters == null && downloadedTheaters == null) {
            uiController.showErrorAlert(uiController.getString(UIConstants.NO_THEATER_FOUND));
            uiController.mainMenuRequested();

            return;
        } 

        this.theaters = allTheaters;

        theaterList.deleteAll();
        theaterList.append(uiController.getString(UIConstants.SELECT_THEATER), 
                           null);
        Utils.appendTheaterList(uiController, theaterList, theaters, 
                                downloadedTheaters);
    } 

    public void itemStateChanged(Item item) {
        if (item == theaterList) {
            // the first one is 'select theater'
            int selection = theaterList.getSelectedIndex();

            if (theaterList.getString(0).equals(uiController.getString(UIConstants.SELECT_THEATER))) {
                // remove the first 'select theater option"
                if (selection == 0) {
                    return;
                } else {
                    theaterList.delete(0);

                    selection--;
                } 
            } 

            theaterChanged(selection);
        } else if (item == movieList) {
            resetDayList();
            cleanItemAfter(SHOWDATELIST_ITEM_NUM);
        } else if (item == showDateList) {
            try {
                setShowTimes(movieSchedules[movieList.getSelectedIndex()].getShowTimes(), 
                             showDateList.getSelectedIndex() + 1);
            } catch (ApplicationException e) {
                System.err.println("Exception " + e);
            } 
        } 
    } 

    public void theaterScheduleDownloadSuccess(TheaterSchedule theaterSchedule, 
                                               int selection) {
        String theaterName = theaters[selection].getName() + " [" 
                             + theaters[selection].getZipCode() + "]";

        // we only update the image for expired entries, even though the remote
        // theater schedule is in cache, we still want to show it as remote to
        // indicate possible chance to download more information in the future
        if (theaterList.getImage(selection) 
                == uiController.getImage(UIConstants.ICON_IDX_SCHEDULE_EXPIRED)) {
            theaterList.set(selection, theaterName, 
                            uiController.getImage(UIConstants.ICON_IDX_SCHEDULE_LOCAL));
        } 

        movieSchedules = theaterSchedule.getMovieSchedules();
        movies = new Movie[movieSchedules.length];

        movieList.deleteAll();

        for (int i = 0; i < movieSchedules.length; i++) {
            movies[i] = movieSchedules[i].getMovie();

            String rating = movies[i].getRating();
            byte imageIndex = UIConstants.ICON_IDX_RATING_UNRATED;

            if ("g".equals(rating)) {
                imageIndex = UIConstants.ICON_IDX_RATING_G;
            } else if ("pg".equals(rating)) {
                imageIndex = UIConstants.ICON_IDX_RATING_PG;
            } else if ("r".equals(rating)) {
                imageIndex = UIConstants.ICON_IDX_RATING_R;
            } 

            movieList.append(movies[i].getTitle(), 
                             uiController.getImage(imageIndex));
        } 

        resetDayList();
        cleanItemAfter(THEATERLIST_ITEM_NUM);
        append(moviesDate);
        append(movieList);
        append(showDateList);
    } 

    private void resetDayList() {
        // add the choose a day option
        if (showDateList.size() <= SHOWDATE_NUM) {
            showDateList.insert(0, 
                                uiController.getString(UIConstants.CHOOSE_A_DAY), 
                                null);
            showDateList.setSelectedIndex(0, true);
        } 
    } 

    private void theaterChanged(int selection) {
        String theaterName = theaters[selection].getName() + " [" 
                             + theaters[selection].getZipCode() + "]";

        // remove all items first
        // this method will call theaterScheduleDownloadSuccess later
        uiController.lookupTheaterSchedule(theaters[selection], selection);
    } 

    private int[] getShowTimes() {
        int[] showTime = new int[3];

        showTime[0] = showDateList.getSelectedIndex() + 1;

        String showTimeStr = 
            showTimesList.getString(showTimesList.getSelectedIndex());
        int colonPos = showTimeStr.indexOf(':');

        showTime[1] = Integer.parseInt(showTimeStr.substring(0, colonPos));
        showTime[2] = Integer.parseInt(showTimeStr.substring(colonPos + 1, 
                showTimeStr.indexOf(' ')));

        if (showTimeStr.indexOf(uiController.getString(UIConstants.PREF_PM)) 
                > 0 && showTime[1] != 12) {
            showTime[1] = showTime[1] + 12;
        } 

        return showTime;
    } 

    private void setShowTimes(int[][] showTimes, int date) {
        movieTimeLabel.setText(movieList.getString(movieList.getSelectedIndex()));

        this.showTimes = showTimes;

        showTimesList.deleteAll();

        for (int i = 0; i < showTimes.length; i++) {
            if (showTimes[i][0] == date) {
                showTimesList.append(Utils.showTimeToHourMinute(uiController, showTimes[i]), 
                                     null);
            } 
        } 

        // add back the choose a day option
        if (showDateList.size() > SHOWDATE_NUM) {
            showDateList.delete(0);
        } 

        cleanItemAfter(SHOWDATELIST_ITEM_NUM);
        append(movieTimeLabel);
        append(showTimesList);
        append(seatingPref);
        append(numOfTickets);
        append(selectSeats);
    } 

    public void commandAction(Command command, Item item) {
        if (command == selectSeatsCommand) {
            if (numOfTickets.getString().length() == 0 
                    || Integer.parseInt(numOfTickets.getString()) < 1) {
                uiController.showErrorAlert(uiController.getString(UIConstants.NUM_OF_TICKET_ERR));
            } else {
                uiController.selectSeatsSelected(movieSchedules[movieList.getSelectedIndex()], 
                                                 getShowTimes());
            } 
        } 
    } 

    public void commandAction(Command command, Displayable displayable) {
        uiController.commandAction(command, displayable);
    } 

    private void createItems() {
        theaterList = new ChoiceGroup(null, Choice.POPUP);
        movieList = new ChoiceGroup(null, Choice.EXCLUSIVE);
        showTimesList = new ChoiceGroup(null, Choice.EXCLUSIVE);
        seatingPref = new ChoiceGroup(null, Choice.POPUP);
        seatingPref = 
            Utils.newPopUp(uiController, 
                           uiController.getString(UIConstants.SEATING_PREF), 
                           UIConstants.PREF_SEAT_START, 
                           UIConstants.PREF_SEAT_END);
        showDateList = 
            Utils.newPopUp(uiController, 
                           uiController.getString(UIConstants.DAY_COLON), 
                           UIConstants.PREF_DATE_START, 
                           UIConstants.PREF_DATE_END);
        moviesDate = 
            new StringItem(uiController.getString(UIConstants.MOVIES_FOR), 
                           null);
        movieTimeLabel = 
            new StringItem(uiController.getString(UIConstants.MOVIE_TIMES_FOR), 
                           null);
        theaterListLabel = 
            new StringItem(uiController.getString(UIConstants.MOVIE_SCHEDULE_FOR), 
                           null);
        selectSeats = 
            new StringItem(null, 
                           uiController.getString(UIConstants.SELECT_SEATS), 
                           Item.BUTTON);

        selectSeats.setLayout(Item.LAYOUT_CENTER);

        numOfTickets = 
            new TextField(uiController.getString(UIConstants.NUMBER_OF_TICKETS), 
                          "", 3, TextField.NUMERIC);
    } 

    private void cleanItemAfter(int itemNum) {
        if (size() > itemNum) {
            for (int i = size() - 1; i > itemNum; i--) {
                delete(i);
            } 
        } 
    } 

}