解决：编辑一条彩信，附件选择添加音频，返回到编辑界面选择play，不能播放，没有声音

【操作步骤】：编辑一条彩信，附件选择添加音频（外部音频），返回到编辑界面选择play，菜单键选择view slideshow
【测试结果】：不能播放，没有声音

【预期结果】：可以播放

根据以往的经验（之前也有一片博文涉及到类似的功能）这里首先想到的是乱码，通过查看数据库，也证实了这个想法；

因此，从文件管理器中共享一个中文文件名的音频文件（当然通过测试其他任何格式的文件包括图片，视频等只要是中文乱码则都有相同的问题）到短信中（文件管理器通过ACTION_SEND启动ComposeMessageActivity，该Activity在清单文件中注册了该Action）；

CompseMessageActivity通过handleSendIntent（）方法来接受Intent中的数据：

private boolean handleSendIntent() {
        Intent intent = getIntent();
        Bundle extras = intent.getExtras();
        if (extras == null) {
            return false;
        }

        final String mimeType = intent.getType();
        String action = intent.getAction();
        if (Intent.ACTION_SEND.equals(action)) {
            if (extras.containsKey(Intent.EXTRA_STREAM)) {
                final Uri uri = (Uri)extras.getParcelable(Intent.EXTRA_STREAM);
                getAsyncDialog().runAsync(new Runnable() {
                    @Override
                    public void run() {
                        mAttachFileUri = uri;
                        addAttachment(mimeType, uri, false);
                    }
                }, null, R.string.adding_attachments_title);
                return true;
            } else if (extras.containsKey(Intent.EXTRA_TEXT)) {
                mWorkingMessage.setText(extras.getString(Intent.EXTRA_TEXT));
                return true;
            }
        } else if ((Intent.ACTION_SEND_MULTIPLE.equals(action) &&
                extras.containsKey(Intent.EXTRA_STREAM)) || mIsSendMultiple) {
            SlideshowModel slideShow = mWorkingMessage.getSlideshow();
            final ArrayList<Parcelable> uris = extras.getParcelableArrayList(Intent.EXTRA_STREAM);
            if (uris.size() > 0) {
                mIsSendMultiple = true;
            }
            int currentSlideCount = slideShow != null ? slideShow.size() : 0;
            int importCount = uris.size();
            if (importCount + currentSlideCount > SlideshowEditor.MAX_SLIDE_NUM) {
                importCount = Math.min(SlideshowEditor.MAX_SLIDE_NUM - currentSlideCount,
                        importCount);
                Toast.makeText(ComposeMessageActivity.this,
                        getString(R.string.too_many_attachments,
                                SlideshowEditor.MAX_SLIDE_NUM, importCount),
                                Toast.LENGTH_LONG).show();
            }

            // Attach all the pictures/videos asynchronously off of the UI thread.
            // Show a progress dialog if adding all the slides hasn't finished
            // within half a second.
            final int numberToImport = importCount;
            getAsyncDialog().runAsync(new Runnable() {
                @Override
                public void run() {
                    for (int i = 0; i < numberToImport; i++) {
                        Parcelable uri = uris.get(i);
                        addAttachment(mimeType, (Uri) uri, true);
                    }
                    updateMmsSizeIndicator();
                }
            }, null, R.string.adding_attachments_title);
            return true;
        }
        return false;
    }
调用addAttachment（）方法；

 private void addAttachment(String type, Uri uri, boolean append) {
        if (uri != null) {
            // When we're handling Intent.ACTION_SEND_MULTIPLE, the passed in items can be
            // videos, and/or images, and/or some other unknown types we don't handle. When
            // a single attachment is "shared" the type will specify an image or video. When
            // there are multiple types, the type passed in is "*/*". In that case, we've got
            // to look at the uri to figure out if it is an image or video.
            boolean wildcard = "*/*".equals(type);
            if (type.startsWith("image/")
                    || (wildcard && uri.toString().startsWith(mImageUri))
                    || (wildcard && isImageFile(uri))) {
                addImage(uri, append);
            } else if (type.startsWith("video/")
                    || (wildcard && uri.toString().startsWith(mVideoUri))
                    || (wildcard && isVideoFile(uri))) {
                addVideo(uri, append);
            } else if (type.startsWith("audio/")
                    || (wildcard && uri.toString().startsWith(mAudioUri))
                    || (wildcard && isAudioFile(uri))) {
                addAudio(uri, append);
            } else if (SystemProperties.getBoolean("persist.env.mms.vcard", true)
                    && (type.equals("text/x-vcard")
                    || (wildcard && isVcardFile(uri)))) {
                addVcard(uri);
            } else {
                // Add prompt when file type is not image/video/audio.
                Message msg = Message.obtain(mAddAttachmentHandler,
                        MSG_ADD_ATTACHMENT_FAILED, uri);
                mAddAttachmentHandler.sendMessage(msg);
            }
        }
    }

接下来会调用addVideo-->setAttachement（）等方法进行设置附件，而这写操作均没有进行持久化操作。那么持久化操作在哪里呢？

当我们添加过附件之后，去查看或者播放幻灯片的时候会首先对附件内容进行持久化操作。这里我们调用了MessageUtils.java中的viewMmsMessageAttachment（）方法。

 public static void viewMmsMessageAttachment(final Activity activity, final Uri msgUri,
            final SlideshowModel slideshow, final int requestCode, AsyncDialog asyncDialog) {
        boolean isSimple = (slideshow == null) ? false : slideshow.isSimple();
        if (isSimple) {
            // In attachment-editor mode, we only ever have one slide.
            MessageUtils.viewSimpleSlideshow(activity, slideshow);
        } else {
            // The user wants to view the slideshow. We have to persist the slideshow parts
            // in a background task. If the task takes longer than a half second, a progress dialog
            // is displayed. Once the PDU persisting is done, another runnable on the UI thread get
            // executed to start the SlideshowActivity.
            asyncDialog.runAsync(new Runnable() {
                @Override
                public void run() {
                    // If a slideshow was provided, save it to disk first.
                    if (slideshow != null) {
                        PduPersister persister = PduPersister.getPduPersister(activity);
                        try {
                            PduBody pb = slideshow.toPduBody();
                            persister.updateParts(msgUri, pb, null);
                            slideshow.sync(pb);
                        } catch (MmsException e) {
                            Log.e(TAG, "Unable to save message for preview");
                            return;
                        }
                    }
                }
            }, new Runnable() {
                @Override
                public void run() {
                    // Once the above background thread is complete, this runnable is run
                    // on the UI thread to launch the slideshow activity.
                    launchSlideshowActivity(activity, msgUri, requestCode);
                }
            }, R.string.building_slideshow_title);
        }
    }
上述代码中调用了PudPersister类中的updateParts（）方法；

public void updateParts(Uri uri, PduBody body, HashMap<Uri, InputStream> preOpenedFiles)
            throws MmsException {
        try {
            PduCacheEntry cacheEntry;
            synchronized(PDU_CACHE_INSTANCE) {
                if (PDU_CACHE_INSTANCE.isUpdating(uri)) {
                    if (LOCAL_LOGV) {
                        Log.v(TAG, "updateParts: " + uri + " blocked by isUpdating()");
                    }
                    try {
                        PDU_CACHE_INSTANCE.wait();
                    } catch (InterruptedException e) {
                        Log.e(TAG, "updateParts: ", e);
                    }
                    cacheEntry = PDU_CACHE_INSTANCE.get(uri);
                    if (cacheEntry != null) {
                        ((MultimediaMessagePdu) cacheEntry.getPdu()).setBody(body);
                    }
                }
                // Tell the cache to indicate to other callers that this item
                // is currently being updated.
                PDU_CACHE_INSTANCE.setUpdating(uri, true);
            }

            ArrayList<PduPart> toBeCreated = new ArrayList<PduPart>();
            HashMap<Uri, PduPart> toBeUpdated = new HashMap<Uri, PduPart>();

            int partsNum = body.getPartsNum();
            StringBuilder filter = new StringBuilder().append('(');
            for (int i = 0; i < partsNum; i++) {
                PduPart part = body.getPart(i);
                Uri partUri = part.getDataUri();
                if ((partUri == null) || TextUtils.isEmpty(partUri.getAuthority())
                        || !partUri.getAuthority().startsWith("mms")) {
                    toBeCreated.add(part);
                } else {
                    toBeUpdated.put(partUri, part);

                    // Don't use 'i > 0' to determine whether we should append
                    // 'AND' since 'i = 0' may be skipped in another branch.
                    if (filter.length() > 1) {
                        filter.append(" AND ");
                    }

                    filter.append(Part._ID);
                    filter.append("!=");
                    DatabaseUtils.appendEscapedSQLString(filter, partUri.getLastPathSegment());
                }
            }
            filter.append(')');

            long msgId = ContentUris.parseId(uri);

            // Remove the parts which doesn't exist anymore.
            SqliteWrapper.delete(mContext, mContentResolver,
                    Uri.parse(Mms.CONTENT_URI + "/" + msgId + "/part"),
                    filter.length() > 2 ? filter.toString() : null, null);

            // Create new parts which didn't exist before.
            for (PduPart part : toBeCreated) {
                persistPart(part, msgId, preOpenedFiles);
            }

            // Update the modified parts.
            for (Map.Entry<Uri, PduPart> e : toBeUpdated.entrySet()) {
                updatePart(e.getKey(), e.getValue(), preOpenedFiles);
            }
        } finally {
            synchronized(PDU_CACHE_INSTANCE) {
                PDU_CACHE_INSTANCE.setUpdating(uri, false);
                PDU_CACHE_INSTANCE.notifyAll();
            }
        }
    }
根据上述代码我们可以发现，如果是第一次，也就是没有持久化的时候则会进行insert操作，如果已经执行过insert则会进行update操作，在之前的一篇博客中已经描述过具体的修改方法，这里不再详细赘述，只是把修改的内容给展示出来，其他操作请参考我之前写的一篇博客，地址为：http://blog.csdn.net/huangyabin001/article/details/27523961

修改后：

private void updatePart(Uri uri, PduPart part, HashMap<Uri, InputStream> preOpenedFiles)
            throws MmsException {
        ContentValues values = new ContentValues(7);

        int charset = part.getCharset();
        if (charset != 0 ) {
            values.put(Part.CHARSET, charset);
        }

        String contentType = null;
        if (part.getContentType() != null) {
            contentType = toIsoString(part.getContentType());
            values.put(Part.CONTENT_TYPE, contentType);
        } else {
            throw new MmsException("MIME type of the part must be set.");
        }

        if (part.getFilename() != null) {
            String fileName = new String(part.getFilename());
            values.put(Part.FILENAME, fileName);
        }

        if (part.getName() != null) {
            String name = new String(part.getName());
            values.put(Part.NAME, name);
        }

        String value = null;
        if (part.getContentDisposition() != null) {
            value = toIsoString(part.getContentDisposition());
            values.put(Part.CONTENT_DISPOSITION,value);
        }

        if (part.getContentId() != null) {
            byte[] byteContentId=part.getContentId();
            int encodeContentId=detectEncoding(byteContentId);
            try{
                switch(encodeContentId){
                    case GB2312:
                        value=new String(byteContentId,"GB2312");
                    break;
                    case ASCII:
                        value=new String(byteContentId,"ASCII");
                    break;
                    case UTF8:
                        value=new String(byteContentId,"UTF-8");
                    break;
                    case UNICODE:
                        value=new String(byteContentId,"Unicode");
                    break;
                    default:
                        value = toIsoString(byteContentId);
                    break;
                }
                values.put(Part.CONTENT_ID, value);
            }catch(Exception e){
                e.printStackTrace();
            }
        }

        if (part.getContentLocation() != null) {
            byte[] byteContentLocation=part.getContentLocation();
            int encodeContentLocation=detectEncoding(byteContentLocation);
            try{
                switch(encodeContentLocation){
                    case GB2312:
                        value=new String(byteContentLocation,"GB2312");
                    break;
                    case ASCII:
                        value=new String(byteContentLocation,"ASCII");
                    break;
                    case UTF8:
                        value=new String(byteContentLocation,"UTF-8");
                    break;
                    case UNICODE:
                        value=new String(byteContentLocation,"Unicode");
                    break;
                    default:
                        value = toIsoString(byteContentLocation);
                    break;
                }
                values.put(Part.CONTENT_LOCATION,value);
            }catch(Exception e){
                e.printStackTrace();
            }
        }
        SqliteWrapper.update(mContext, mContentResolver, uri, values, null, null);

        // Only update the data when:
        // 1. New binary data supplied or
        // 2. The Uri of the part is different from the current one.
        if ((part.getData() != null)
                || (uri != part.getDataUri())) {
            persistData(part, uri, contentType, preOpenedFiles);
        }
    }
修改前：

  private void updatePart(Uri uri, PduPart part, HashMap<Uri, InputStream> preOpenedFiles)
            throws MmsException {
        ContentValues values = new ContentValues(7);

        int charset = part.getCharset();
        if (charset != 0 ) {
            values.put(Part.CHARSET, charset);
        }

        String contentType = null;
        if (part.getContentType() != null) {
            contentType = toIsoString(part.getContentType());
            values.put(Part.CONTENT_TYPE, contentType);
        } else {
            throw new MmsException("MIME type of the part must be set.");
        }

        if (part.getFilename() != null) {
            String fileName = new String(part.getFilename());
            values.put(Part.FILENAME, fileName);
        }

        if (part.getName() != null) {
            String name = new String(part.getName());
            values.put(Part.NAME, name);
        }

        Object value = null;
        if (part.getContentDisposition() != null) {
            value = toIsoString(part.getContentDisposition());
            values.put(Part.CONTENT_DISPOSITION, (String) value);
        }

        if (part.getContentId() != null) {
            value = toIsoString(part.getContentId());
            values.put(Part.CONTENT_ID, (String) value);
        }

        if (part.getContentLocation() != null) {
            value = toIsoString(part.getContentLocation());
            values.put(Part.CONTENT_LOCATION, (String) value);
        }

        SqliteWrapper.update(mContext, mContentResolver, uri, values, null, null);

        // Only update the data when:
        // 1. New binary data supplied or
        // 2. The Uri of the part is different from the current one.
        if ((part.getData() != null)
                || (uri != part.getDataUri())) {
            persistData(part, uri, contentType, preOpenedFiles);
        }
    }