itemdisplayscreen.java

一个J2ME编写的Pim卡电话本的读写Demo软件

package 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(final Command command, Displayable displayable) {
        if (command == backCommand) {
            new Thread(new Runnable() {
                    public void run() {
                        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);
                    }
                }).start();
        } 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();
        }
    }

    public void commandAction(final Command command, final Item formItem) {
        new Thread(new Runnable() {
                public void run() {
                    final int field = ((Integer)fieldTable.get(formItem)).intValue();

                    if (command == editBooleanCommand) {
                        boolean newValue = !item.getBoolean(field, 0);
                        item.setBoolean(field, 0, PIMItem.ATTR_NONE, newValue);
                        ((StringItem)formItem).setText(newValue ? "yes" : "no");
                    } else if (command == editArrayCommand) {
                        String label = item.getPIMList().getFieldLabel(field);
                        final String[] a = item.getStringArray(field, 0);