itemdisplayscreen.java

基于手机的通信录、文件、图片读写开发,j2me开发架构

/*
 * @(#)ItemDisplayScreen.java	1.9 04/06/14
 *
 * Copyright (c) 2000-2004 Sun Microsystems, Inc. All rights reserved.
 * PROPRIETARY/CONFIDENTIAL
 * Use is subject to license terms
 */

package PDAPDemo.src.example.pim;


import java.io.ByteArrayOutputStream;
import java.util.Date;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.DateField;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.ItemCommandListener;
import javax.microedition.lcdui.List;
import javax.microedition.lcdui.StringItem;
import javax.microedition.lcdui.TextField;
import javax.microedition.pim.Contact;
import javax.microedition.pim.Event;
import javax.microedition.pim.PIM;
import javax.microedition.pim.PIMException;
import javax.microedition.pim.PIMItem;
import javax.microedition.pim.ToDo;

/**
 * Demonstrate the use of JSR 75 PIM APIs
 */
public class ItemDisplayScreen extends Form implements CommandListener, ItemCommandListener {

    private final Command editArrayCommand = new Command("Edit", Command.OK, 1);
    private final Command editBooleanCommand = new Command("Edit", Command.OK, 1);
    private final Command commitCommand = new Command("Commit", Command.OK, 2);
    private final Command backCommand = new Command("Back", Command.BACK, 1);
    private final Command showVCard = new Command("Show vCard", Command.SCREEN, 5);
    private final Command showVCalendar = new Command("Show vCalendar", Command.SCREEN, 5);
    private final Command addField = new Command("Add Field", Command.SCREEN, 2);
    private final Command removeField = new Command("Remove Field", Command.SCREEN, 3);
    private final PIMDemo midlet;
    private final ItemSelectionScreen caller;
    private final PIMItem item;
    private final Hashtable fieldTable = new Hashtable(); // maps field indices to items

    public ItemDisplayScreen(PIMDemo midlet,
        ItemSelectionScreen caller, PIMItem item) throws PIMException {

        super("PIM Item");
        this.midlet = midlet;
        this.caller = caller;
        this.item = item;

        populateForm();

        addCommand(backCommand);
        addCommand(commitCommand);
        setCommandListener(this);
    }

    private boolean isClassField(int field) {
        return item instanceof Contact && field == Contact.CLASS
            || item instanceof Event && field == Event.CLASS
            || item instanceof ToDo && field == ToDo.CLASS;
    }

    private void populateForm() throws PIMException {
        deleteAll();
        fieldTable.clear();
        int[] fields = item.getPIMList().getSupportedFields();
        boolean allFieldsUsed = true;
        for (int i = 0; i < fields.length; i++) {
            int field = fields[i];
            // exclude CLASS field
            if (isClassField(field)) {
                continue;
            }
            if (item.countValues(field) == 0) {
                allFieldsUsed = false;
                continue;
            }
            int dataType = item.getPIMList().getFieldDataType(field);
            String label = item.getPIMList().getFieldLabel(field);
            Item formItem = null;
            switch (dataType) {
                case PIMItem.STRING: {
                    String sValue = item.getString(field, 0);
                    if (sValue == null) {
                        sValue = "";
                    }
                    int style = TextField.ANY;
                    // cater for specific field styles
                    if (item instanceof Contact) {
                        switch (field) {
                            case Contact.EMAIL:
                                style = TextField.EMAILADDR;
                                break;
                            case Contact.TEL:
                                style = TextField.PHONENUMBER;
                                break;
                            case Contact.URL:
                                style = TextField.URL;
                                break;
                        }
                    }
                    try {
                        formItem = new TextField(label, sValue, 128, style);
                    } catch (IllegalArgumentException e) {
                        formItem = new TextField(label, sValue, 128, TextField.ANY);
                    }
                    break;
                }
                case PIMItem.BOOLEAN: {
                    formItem = new StringItem(label,
                        item.getBoolean(field, 0) ? "yes" : "no");
                    formItem.setDefaultCommand(editBooleanCommand);
                    break;
                }
                case PIMItem.STRING_ARRAY: {
                    String[] a = item.getStringArray(field, 0);
                    if (a != null) {
                        formItem = new StringItem(label, joinStringArray(a));
                        formItem.setDefaultCommand(editArrayCommand);
                    }
                    break;
                }
                case PIMItem.DATE: {
                    long time = item.getDate(field, 0);
                    int style = DateField.DATE_TIME;
                    // some fields are date only, without a time.
                    // correct for these fields:
                    if (item instanceof Contact) {
                        switch (field) {
                            case Contact.BIRTHDAY:
                                style = DateField.DATE;
                                break;
                        }
                    }
                    formItem = new DateField(label, style);
                    ((DateField) formItem).setDate(new Date(time));
                    break;
                }
                case PIMItem.INT: {
                    formItem = new TextField(label,
                        String.valueOf(item.getInt(field, 0)),
                        64, TextField.DECIMAL);
                    break;
                }
                case PIMItem.BINARY: {
                    byte[] data = item.getBinary(field, 0);
                    if (data != null) {
                        formItem = new StringItem(label, data.length + " bytes");
                    }
                    break;
                }
            }
            if (formItem != null) {
                append(formItem);
                fieldTable.put(formItem, new Integer(field));
                formItem.addCommand(removeField);
                formItem.setItemCommandListener(this);
            }
        }
        if (item instanceof Contact) {
            addCommand(showVCard);
        } else {
            addCommand(showVCalendar);
        }
        if (!allFieldsUsed) {
            addCommand(addField);
        } else {
            removeCommand(addField);
        }
    }

    public void commandAction(Command command, Displayable displayable) {
        if (command == backCommand) {
            try {
                getUserData();
            } catch (Exception e) {
                // ignore; store what can be stored of the data
            }
            try {
                caller.populateList();
            } catch (Exception e) {
                // ignore again; show what can be shown of the list
            }
            Display.getDisplay(midlet).setCurrent(caller);
        } else if (command == commitCommand) {
            commit();
        } else if (command == showVCard) {
            showItem("VCARD/2.1");
        } else if (command == showVCalendar) {
            showItem("VCALENDAR/1.0");
        } else if (command == addField) {
            addField();
        }