xref: /packages/apps/Mms/src/com/android/mms/ui/MessageUtils.java

/*
 * Copyright (C) 2008 Esmertec AG.
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.mms.ui;

import com.android.mms.MmsConfig;
import com.android.mms.R;
import com.android.mms.LogTag;
import com.android.mms.data.WorkingMessage;
import com.android.mms.model.MediaModel;
import com.android.mms.model.SlideModel;
import com.android.mms.model.SlideshowModel;
import com.android.mms.transaction.MmsMessageSender;
import com.android.mms.util.AddressUtils;
import com.google.android.mms.ContentType;
import com.google.android.mms.MmsException;
import com.google.android.mms.pdu.CharacterSets;
import com.google.android.mms.pdu.EncodedStringValue;
import com.google.android.mms.pdu.MultimediaMessagePdu;
import com.google.android.mms.pdu.NotificationInd;
import com.google.android.mms.pdu.PduBody;
import com.google.android.mms.pdu.PduHeaders;
import com.google.android.mms.pdu.PduPart;
import com.google.android.mms.pdu.PduPersister;
import com.google.android.mms.pdu.RetrieveConf;
import com.google.android.mms.pdu.SendReq;
import com.google.android.mms.util.SqliteWrapper;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentUris;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnCancelListener;
import android.content.DialogInterface.OnClickListener;
import android.content.res.Resources;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Handler;
import android.provider.Telephony.Mms;
import android.provider.Telephony.Sms;
import android.telephony.PhoneNumberUtils;
import android.telephony.TelephonyManager;
import android.text.TextUtils;
import android.text.format.DateUtils;
import android.text.format.Time;
import android.text.style.URLSpan;
import android.util.Log;
import android.widget.Toast;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * An utility class for managing messages.
 */
public class MessageUtils {
    interface ResizeImageResultCallback {
        void onResizeResult(PduPart part, boolean append);
    }

    private static final String TAG = LogTag.TAG;
    private static String sLocalNumber;

    // Cache of both groups of space-separated ids to their full
    // comma-separated display names, as well as individual ids to
    // display names.
    // TODO: is it possible for canonical address ID keys to be
    // re-used?  SQLite does reuse IDs on NULL id_ insert, but does
    // anything ever delete from the mmssms.db canonical_addresses
    // table?  Nothing that I could find.
    private static final Map<String, String> sRecipientAddress =
            new ConcurrentHashMap<String, String>(20 /* initial capacity */);

    private MessageUtils() {
        // Forbidden being instantiated.
    }

    public static String getMessageDetails(Context context, Cursor cursor, int size) {
        if (cursor == null) {
            return null;
        }

        if ("mms".equals(cursor.getString(MessageListAdapter.COLUMN_MSG_TYPE))) {
            int type = cursor.getInt(MessageListAdapter.COLUMN_MMS_MESSAGE_TYPE);
            switch (type) {
                case PduHeaders.MESSAGE_TYPE_NOTIFICATION_IND:
                    return getNotificationIndDetails(context, cursor);
                case PduHeaders.MESSAGE_TYPE_RETRIEVE_CONF:
                case PduHeaders.MESSAGE_TYPE_SEND_REQ:
                    return getMultimediaMessageDetails(context, cursor, size);
                default:
                    Log.w(TAG, "No details could be retrieved.");
                    return "";
            }
        } else {
            return getTextMessageDetails(context, cursor);
        }
    }

    private static String getNotificationIndDetails(Context context, Cursor cursor) {
        StringBuilder details = new StringBuilder();
        Resources res = context.getResources();

        long id = cursor.getLong(MessageListAdapter.COLUMN_ID);
        Uri uri = ContentUris.withAppendedId(Mms.CONTENT_URI, id);
        NotificationInd nInd;

        try {
            nInd = (NotificationInd) PduPersister.getPduPersister(
                    context).load(uri);
        } catch (MmsException e) {
            Log.e(TAG, "Failed to load the message: " + uri, e);
            return context.getResources().getString(R.string.cannot_get_details);
        }

        // Message Type: Mms Notification.
        details.append(res.getString(R.string.message_type_label));
        details.append(res.getString(R.string.multimedia_notification));

        // From: ***
        String from = extractEncStr(context, nInd.getFrom());
        details.append('\n');
        details.append(res.getString(R.string.from_label));
        details.append(!TextUtils.isEmpty(from)? from:
                                 res.getString(R.string.hidden_sender_address));

        // Date: ***
        details.append('\n');
        details.append(res.getString(
                                R.string.expire_on,
                                MessageUtils.formatTimeStampString(
                                        context, nInd.getExpiry() * 1000L, true)));

        // Subject: ***
        details.append('\n');
        details.append(res.getString(R.string.subject_label));

        EncodedStringValue subject = nInd.getSubject();
        if (subject != null) {
            details.append(subject.getString());
        }

        // Message class: Personal/Advertisement/Infomational/Auto
        details.append('\n');
        details.append(res.getString(R.string.message_class_label));
        details.append(new String(nInd.getMessageClass()));

        // Message size: *** KB
        details.append('\n');
        details.append(res.getString(R.string.message_size_label));
        details.append(String.valueOf((nInd.getMessageSize() + 1023) / 1024));
        details.append(context.getString(R.string.kilobyte));

        return details.toString();
    }

    private static String getMultimediaMessageDetails(
            Context context, Cursor cursor, int size) {
        int type = cursor.getInt(MessageListAdapter.COLUMN_MMS_MESSAGE_TYPE);
        if (type == PduHeaders.MESSAGE_TYPE_NOTIFICATION_IND) {
            return getNotificationIndDetails(context, cursor);
        }

        StringBuilder details = new StringBuilder();
        Resources res = context.getResources();

        long id = cursor.getLong(MessageListAdapter.COLUMN_ID);
        Uri uri = ContentUris.withAppendedId(Mms.CONTENT_URI, id);
        MultimediaMessagePdu msg;

        try {
            msg = (MultimediaMessagePdu) PduPersister.getPduPersister(
                    context).load(uri);
        } catch (MmsException e) {
            Log.e(TAG, "Failed to load the message: " + uri, e);
            return context.getResources().getString(R.string.cannot_get_details);
        }

        // Message Type: Text message.
        details.append(res.getString(R.string.message_type_label));
        details.append(res.getString(R.string.multimedia_message));

        if (msg instanceof RetrieveConf) {
            // From: ***
            String from = extractEncStr(context, ((RetrieveConf) msg).getFrom());
            details.append('\n');
            details.append(res.getString(R.string.from_label));
            details.append(!TextUtils.isEmpty(from)? from:
                                  res.getString(R.string.hidden_sender_address));
        }

        // To: ***
        details.append('\n');
        details.append(res.getString(R.string.to_address_label));
        EncodedStringValue[] to = msg.getTo();
        if (to != null) {
            details.append(EncodedStringValue.concat(to));
        }
        else {
            Log.w(TAG, "recipient list is empty!");
        }


        // Bcc: ***
        if (msg instanceof SendReq) {
            EncodedStringValue[] values = ((SendReq) msg).getBcc();
            if ((values != null) && (values.length > 0)) {
                details.append('\n');
                details.append(res.getString(R.string.bcc_label));
                details.append(EncodedStringValue.concat(values));
            }
        }

        // Date: ***
        details.append('\n');
        int msgBox = cursor.getInt(MessageListAdapter.COLUMN_MMS_MESSAGE_BOX);
        if (msgBox == Mms.MESSAGE_BOX_DRAFTS) {
            details.append(res.getString(R.string.saved_label));
        } else if (msgBox == Mms.MESSAGE_BOX_INBOX) {
            details.append(res.getString(R.string.received_label));
        } else {
            details.append(res.getString(R.string.sent_label));
        }

        details.append(MessageUtils.formatTimeStampString(
                context, msg.getDate() * 1000L, true));

        // Subject: ***
        details.append('\n');
        details.append(res.getString(R.string.subject_label));

        EncodedStringValue subject = msg.getSubject();
        if (subject != null) {
            String subStr = subject.getString();
            // Message size should include size of subject.
            size += subStr.length();
            details.append(subStr);
        }

        // Priority: High/Normal/Low
        details.append('\n');
        details.append(res.getString(R.string.priority_label));
        details.append(getPriorityDescription(context, msg.getPriority()));

        // Message size: *** KB
        details.append('\n');
        details.append(res.getString(R.string.message_size_label));
        details.append((size - 1)/1000 + 1);
        details.append(" KB");

        return details.toString();
    }

    private static String getTextMessageDetails(Context context, Cursor cursor) {
        StringBuilder details = new StringBuilder();
        Resources res = context.getResources();

        // Message Type: Text message.
        details.append(res.getString(R.string.message_type_label));
        details.append(res.getString(R.string.text_message));

        // Address: ***
        details.append('\n');
        int smsType = cursor.getInt(MessageListAdapter.COLUMN_SMS_TYPE);
        if (Sms.isOutgoingFolder(smsType)) {
            details.append(res.getString(R.string.to_address_label));
        } else {
            details.append(res.getString(R.string.from_label));
        }
        details.append(cursor.getString(MessageListAdapter.COLUMN_SMS_ADDRESS));

        // Date: ***
        details.append('\n');
        if (smsType == Sms.MESSAGE_TYPE_DRAFT) {
            details.append(res.getString(R.string.saved_label));
        } else if (smsType == Sms.MESSAGE_TYPE_INBOX) {
            details.append(res.getString(R.string.received_label));
        } else {
            details.append(res.getString(R.string.sent_label));
        }

        long date = cursor.getLong(MessageListAdapter.COLUMN_SMS_DATE);
        details.append(MessageUtils.formatTimeStampString(context, date, true));

        // Error code: ***
        int errorCode = cursor.getInt(MessageListAdapter.COLUMN_SMS_ERROR_CODE);
        if (errorCode != 0) {
            details.append('\n')
                .append(res.getString(R.string.error_code_label))
                .append(errorCode);
        }

        return details.toString();
    }

    static private String getPriorityDescription(Context context, int PriorityValue) {
        Resources res = context.getResources();
        switch(PriorityValue) {
            case PduHeaders.PRIORITY_HIGH:
                return res.getString(R.string.priority_high);
            case PduHeaders.PRIORITY_LOW:
                return res.getString(R.string.priority_low);
            case PduHeaders.PRIORITY_NORMAL:
            default:
                return res.getString(R.string.priority_normal);
        }
    }

    public static int getAttachmentType(SlideshowModel model) {
        if (model == null) {
            return WorkingMessage.TEXT;
        }

        int numberOfSlides = model.size();
        if (numberOfSlides > 1) {
            return WorkingMessage.SLIDESHOW;
        } else if (numberOfSlides == 1) {
            // Only one slide in the slide-show.
            SlideModel slide = model.get(0);
            if (slide.hasVideo()) {
                return WorkingMessage.VIDEO;
            }

            if (slide.hasAudio() && slide.hasImage()) {
                return WorkingMessage.SLIDESHOW;
            }

            if (slide.hasAudio()) {
                return WorkingMessage.AUDIO;
            }

            if (slide.hasImage()) {
                return WorkingMessage.IMAGE;
            }

            if (slide.hasText()) {
                return WorkingMessage.TEXT;
            }
        }

        return WorkingMessage.TEXT;
    }

    public static String formatTimeStampString(Context context, long when) {
        return formatTimeStampString(context, when, false);
    }

    public static String formatTimeStampString(Context context, long when, boolean fullFormat) {
        Time then = new Time();
        then.set(when);
        Time now = new Time();
        now.setToNow();

        // Basic settings for formatDateTime() we want for all cases.
        int format_flags = DateUtils.FORMAT_NO_NOON_MIDNIGHT |
                           DateUtils.FORMAT_ABBREV_ALL |
                           DateUtils.FORMAT_CAP_AMPM;

        // If the message is from a different year, show the date and year.
        if (then.year != now.year) {
            format_flags |= DateUtils.FORMAT_SHOW_YEAR | DateUtils.FORMAT_SHOW_DATE;
        } else if (then.yearDay != now.yearDay) {
            // If it is from a different day than today, show only the date.
            format_flags |= DateUtils.FORMAT_SHOW_DATE;
        } else {
            // Otherwise, if the message is from today, show the time.
            format_flags |= DateUtils.FORMAT_SHOW_TIME;
        }

        // If the caller has asked for full details, make sure to show the date
        // and time no matter what we've determined above (but still make showing
        // the year only happen if it is a different year from today).
        if (fullFormat) {
            format_flags |= (DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_TIME);
        }

        return DateUtils.formatDateTime(context, when, format_flags);
    }

    /**
     * @parameter recipientIds space-separated list of ids
     */
    public static String getRecipientsByIds(Context context, String recipientIds,
                                            boolean allowQuery) {
        String value = sRecipientAddress.get(recipientIds);
        if (value != null) {
            return value;
        }
        if (!TextUtils.isEmpty(recipientIds)) {
            StringBuilder addressBuf = extractIdsToAddresses(
                    context, recipientIds, allowQuery);
            if (addressBuf == null) {
                // temporary error?  Don't memoize.
                return "";
            }
            value = addressBuf.toString();
        } else {
            value = "";
        }
        sRecipientAddress.put(recipientIds, value);
        return value;
    }

    private static StringBuilder extractIdsToAddresses(Context context, String recipients,
                                                       boolean allowQuery) {
        StringBuilder addressBuf = new StringBuilder();
        String[] recipientIds = recipients.split(" ");
        boolean firstItem = true;
        for (String recipientId : recipientIds) {
            String value = sRecipientAddress.get(recipientId);

            if (value == null) {
                if (!allowQuery) {
                    // when allowQuery is false, if any value from sRecipientAddress.get() is null,
                    // return null for the whole thing. We don't want to stick partial result
                    // into sRecipientAddress for multiple recipient ids.
                    return null;
                }

                Uri uri = Uri.parse("content://mms-sms/canonical-address/" + recipientId);
                Cursor c = SqliteWrapper.query(context, context.getContentResolver(),
                                               uri, null, null, null, null);
                if (c != null) {
                    try {
                        if (c.moveToFirst()) {
                            value = c.getString(0);
                            sRecipientAddress.put(recipientId, value);
                        }
                    } finally {
                        c.close();
                    }
                }
            }
            if (value == null) {
                continue;
            }
            if (firstItem) {
                firstItem = false;
            } else {
                addressBuf.append(";");
            }
            addressBuf.append(value);
        }

        return (addressBuf.length() == 0) ? null : addressBuf;
    }

    public static void selectAudio(Context context, int requestCode) {
        if (context instanceof Activity) {
            Intent intent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);
            intent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_DEFAULT, false);
            intent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_SILENT, false);
            intent.putExtra(RingtoneManager.EXTRA_RINGTONE_INCLUDE_DRM, false);
            intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TITLE,
                    context.getString(R.string.select_audio));
            ((Activity) context).startActivityForResult(intent, requestCode);
        }
    }

    public static void recordSound(Context context, int requestCode) {
        if (context instanceof Activity) {
            Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
            intent.setType(ContentType.AUDIO_AMR);
            intent.setClassName("com.android.soundrecorder",
                    "com.android.soundrecorder.SoundRecorder");

            ((Activity) context).startActivityForResult(intent, requestCode);
        }
    }

    public static void selectVideo(Context context, int requestCode) {
        selectMediaByType(context, requestCode, ContentType.VIDEO_UNSPECIFIED);
    }

    public static void selectImage(Context context, int requestCode) {
        selectMediaByType(context, requestCode, ContentType.IMAGE_UNSPECIFIED);
    }

    private static void selectMediaByType(
            Context context, int requestCode, String contentType) {
         if (context instanceof Activity) {

            Intent innerIntent = new Intent(Intent.ACTION_GET_CONTENT);

            innerIntent.setType(contentType);

            Intent wrapperIntent = Intent.createChooser(innerIntent, null);

            ((Activity) context).startActivityForResult(wrapperIntent, requestCode);
        }
    }

    public static void viewSimpleSlideshow(Context context, SlideshowModel slideshow) {
        if (!slideshow.isSimple()) {
            throw new IllegalArgumentException(
                    "viewSimpleSlideshow() called on a non-simple slideshow");
        }
        SlideModel slide = slideshow.get(0);
        MediaModel mm = null;
        if (slide.hasImage()) {
            mm = slide.getImage();
        } else if (slide.hasVideo()) {
            mm = slide.getVideo();
        }

        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

        String contentType;
        if (mm.isDrmProtected()) {
            contentType = mm.getDrmObject().getContentType();
        } else {
            contentType = mm.getContentType();
        }
        intent.setDataAndType(mm.getUri(), contentType);
        context.startActivity(intent);
    }

    public static void showErrorDialog(Context context,
            String title, String message) {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);

        builder.setIcon(R.drawable.ic_sms_mms_not_delivered);
        builder.setTitle(title);
        builder.setMessage(message);
        builder.setPositiveButton(android.R.string.ok, null);
        builder.show();
    }

    /**
     * The quality parameter which is used to compress JPEG images.
     */
    public static final int IMAGE_COMPRESSION_QUALITY = 80;
    /**
     * The minimum quality parameter which is used to compress JPEG images.
     */
    public static final int MINIMUM_IMAGE_COMPRESSION_QUALITY = 50;

    public static Uri saveBitmapAsPart(Context context, Uri messageUri, Bitmap bitmap)
            throws MmsException {

        ByteArrayOutputStream os = new ByteArrayOutputStream();
        bitmap.compress(CompressFormat.JPEG, IMAGE_COMPRESSION_QUALITY, os);

        PduPart part = new PduPart();

        part.setContentType("image/jpeg".getBytes());
        String contentId = "Image" + System.currentTimeMillis();
        part.setContentLocation((contentId + ".jpg").getBytes());
        part.setContentId(contentId.getBytes());
        part.setData(os.toByteArray());

        Uri retVal = PduPersister.getPduPersister(context).persistPart(part,
                        ContentUris.parseId(messageUri));

        if (Log.isLoggable(LogTag.APP, Log.VERBOSE)) {
            log("saveBitmapAsPart: persisted part with uri=" + retVal);
        }

        return retVal;
    }

    /**
     * Message overhead that reduces the maximum image byte size.
     * 5000 is a realistic overhead number that allows for user to also include
     * a small MIDI file or a couple pages of text along with the picture.
     */
    public static final int MESSAGE_OVERHEAD = 5000;

    public static void resizeImageAsync(final Context context,
            final Uri imageUri, final Handler handler,
            final ResizeImageResultCallback cb,
            final boolean append) {

        // Show a progress toast if the resize hasn't finished
        // within one second.
        // Stash the runnable for showing it away so we can cancel
        // it later if the resize completes ahead of the deadline.
        final Runnable showProgress = new Runnable() {
            public void run() {
                Toast.makeText(context, R.string.compressing, Toast.LENGTH_SHORT).show();
            }
        };
        // Schedule it for one second from now.
        handler.postDelayed(showProgress, 1000);

        new Thread(new Runnable() {
            public void run() {
                final PduPart part;
                try {
                    UriImage image = new UriImage(context, imageUri);
                    part = image.getResizedImageAsPart(
                        MmsConfig.getMaxImageWidth(),
                        MmsConfig.getMaxImageHeight(),
                        MmsConfig.getMaxMessageSize() - MESSAGE_OVERHEAD);
                } finally {
                    // Cancel pending show of the progress toast if necessary.
                    handler.removeCallbacks(showProgress);
                }

                handler.post(new Runnable() {
                    public void run() {
                        cb.onResizeResult(part, append);
                    }
                });
            }
        }).start();
    }

    public static void showDiscardDraftConfirmDialog(Context context,
            OnClickListener listener) {
        new AlertDialog.Builder(context)
                .setIcon(android.R.drawable.ic_dialog_alert)
                .setTitle(R.string.discard_message)
                .setMessage(R.string.discard_message_reason)
                .setPositiveButton(R.string.yes, listener)
                .setNegativeButton(R.string.no, null)
                .show();
    }

    public static String getLocalNumber() {
        if (null == sLocalNumber) {
            sLocalNumber = TelephonyManager.getDefault().getLine1Number();
        }
        return sLocalNumber;
    }

    public static boolean isLocalNumber(String number) {
        if (number == null) {
            return false;
        }

        // we don't use Mms.isEmailAddress() because it is too strict for comparing addresses like
        // "foo+caf_=6505551212=tmomail.net@gmail.com", which is the 'from' address from a forwarded email
        // message from Gmail. We don't want to treat "foo+caf_=6505551212=tmomail.net@gmail.com" and
        // "6505551212" to be the same.
        if (number.indexOf('@') >= 0) {
            return false;
        }

        return PhoneNumberUtils.compare(number, getLocalNumber());
    }

    public static void handleReadReport(final Context context,
            final long threadId,
            final int status,
            final Runnable callback) {
        String selection = Mms.MESSAGE_TYPE + " = " + PduHeaders.MESSAGE_TYPE_RETRIEVE_CONF
            + " AND " + Mms.READ + " = 0"
            + " AND " + Mms.READ_REPORT + " = " + PduHeaders.VALUE_YES;

        if (threadId != -1) {
            selection = selection + " AND " + Mms.THREAD_ID + " = " + threadId;
        }

        final Cursor c = SqliteWrapper.query(context, context.getContentResolver(),
                        Mms.Inbox.CONTENT_URI, new String[] {Mms._ID, Mms.MESSAGE_ID},
                        selection, null, null);

        if (c == null) {
            return;
        }

        final Map<String, String> map = new HashMap<String, String>();
        try {
            if (c.getCount() == 0) {
                if (callback != null) {
                    callback.run();
                }
                return;
            }

            while (c.moveToNext()) {
                Uri uri = ContentUris.withAppendedId(Mms.CONTENT_URI, c.getLong(0));
                map.put(c.getString(1), AddressUtils.getFrom(context, uri));
            }
        } finally {
            c.close();
        }

        OnClickListener positiveListener = new OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                for (final Map.Entry<String, String> entry : map.entrySet()) {
                    MmsMessageSender.sendReadRec(context, entry.getValue(),
                                                 entry.getKey(), status);
                }

                if (callback != null) {
                    callback.run();
                }
            }
        };

        OnClickListener negativeListener = new OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                if (callback != null) {
                    callback.run();
                }
            }
        };

        OnCancelListener cancelListener = new OnCancelListener() {
            public void onCancel(DialogInterface dialog) {
                if (callback != null) {
                    callback.run();
                }
            }
        };

        confirmReadReportDialog(context, positiveListener,
                                         negativeListener,
                                         cancelListener);
    }

    private static void confirmReadReportDialog(Context context,
            OnClickListener positiveListener, OnClickListener negativeListener,
            OnCancelListener cancelListener) {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        builder.setCancelable(true);
        builder.setTitle(R.string.confirm);
        builder.setMessage(R.string.message_send_read_report);
        builder.setPositiveButton(R.string.yes, positiveListener);
        builder.setNegativeButton(R.string.no, negativeListener);
        builder.setOnCancelListener(cancelListener);
        builder.show();
    }

    public static String extractEncStrFromCursor(Cursor cursor,
            int columnRawBytes, int columnCharset) {
        String rawBytes = cursor.getString(columnRawBytes);
        int charset = cursor.getInt(columnCharset);

        if (TextUtils.isEmpty(rawBytes)) {
            return "";
        } else if (charset == CharacterSets.ANY_CHARSET) {
            return rawBytes;
        } else {
            return new EncodedStringValue(charset, PduPersister.getBytes(rawBytes)).getString();
        }
    }

    private static String extractEncStr(Context context, EncodedStringValue value) {
        if (value != null) {
            return value.getString();
        } else {
            return "";
        }
    }

    public static ArrayList<String> extractUris(URLSpan[] spans) {
        int size = spans.length;
        ArrayList<String> accumulator = new ArrayList<String>();

        for (int i = 0; i < size; i++) {
            accumulator.add(spans[i].getURL());
        }
        return accumulator;
    }

    /**
     * Play/view the message attachments.
     * TOOD: We need to save the draft before launching another activity to view the attachments.
     *       This is hacky though since we will do saveDraft twice and slow down the UI.
     *       We should pass the slideshow in intent extra to the view activity instead of
     *       asking it to read attachments from database.
     * @param context
     * @param msgUri the MMS message URI in database
     * @param slideshow the slideshow to save
     * @param persister the PDU persister for updating the database
     * @param sendReq the SendReq for updating the database
     */
    public static void viewMmsMessageAttachment(Context context, Uri msgUri,
            SlideshowModel slideshow) {
        boolean isSimple = (slideshow == null) ? false : slideshow.isSimple();
        if (isSimple) {
            // In attachment-editor mode, we only ever have one slide.
            MessageUtils.viewSimpleSlideshow(context, slideshow);
        } else {
            // If a slideshow was provided, save it to disk first.
            if (slideshow != null) {
                PduPersister persister = PduPersister.getPduPersister(context);
                try {
                    PduBody pb = slideshow.toPduBody();
                    persister.updateParts(msgUri, pb);
                    slideshow.sync(pb);
                } catch (MmsException e) {
                    Log.e(TAG, "Unable to save message for preview");
                    return;
                }
            }
            // Launch the slideshow activity to play/view.
            Intent intent = new Intent(context, SlideshowActivity.class);
            intent.setData(msgUri);
            context.startActivity(intent);
        }
    }

    public static void viewMmsMessageAttachment(Context context, WorkingMessage msg) {
        SlideshowModel slideshow = msg.getSlideshow();
        if (slideshow == null) {
            throw new IllegalStateException("msg.getSlideshow() == null");
        }
        if (slideshow.isSimple()) {
            MessageUtils.viewSimpleSlideshow(context, slideshow);
        } else {
            Uri uri = msg.saveAsMms(false);
            viewMmsMessageAttachment(context, uri, slideshow);
        }
    }

    /**
     * Debugging
     */
    public static void writeHprofDataToFile(){
        String filename = "/sdcard/mms_oom_hprof_data";
        try {
            android.os.Debug.dumpHprofData(filename);
            Log.i(TAG, "##### written hprof data to " + filename);
        } catch (IOException ex) {
            Log.e(TAG, "writeHprofDataToFile: caught " + ex);
        }
    }

    public static boolean isAlias(String string) {
        if (!MmsConfig.isAliasEnabled()) {
            return false;
        }

        if (TextUtils.isEmpty(string)) {
            return false;
        }

        if (Mms.isPhoneNumber(string)) {
            return false;
        }

        if (!isAlphaNumeric(string)) {
            return false;
        }

        int len = string.length();

        if (len < MmsConfig.getAliasMinChars() || len > MmsConfig.getAliasMaxChars()) {
            return false;
        }

        return true;
    }

    public static boolean isAlphaNumeric(String s) {
        char[] chars = s.toCharArray();
        for (int x = 0; x < chars.length; x++) {
            char c = chars[x];
            if ((c >= 'a') && (c <= 'z')) continue;
            if ((c >= 'A') && (c <= 'Z')) continue;
            if ((c >= '0') && (c <= '9')) continue;
                return false;
        }
        return true;
    }

    private static void log(String msg) {
        Log.d(TAG, "[MsgUtils] " + msg);
    }
}