彩信发送

我想追踪的内容是：用户按下发送之后，彩信的图片阿数据阿文件阿，是怎么包装起来，最后发送出去。 

按我看源码的先后顺序来写了。 写完可能最后整理下。 

1. com.android.mms.data.WorkingMessage.java 类 

send()函数。 注释如下： 
    /** 
     * Send this message over the network. Will call back with onMessageSent() 
     * once it has been dispatched to the telephony stack. This WorkingMessage 
     * object is no longer useful after this method has been called. 
     */ 

这个是2.1的源码

public void send() { if (Log.isLoggable(LogTag.TRANSACTION, Log.VERBOSE)) { LogTag.debug("send"); } // Get ready to write to disk. prepareForSave(true /* notify */); // We need the recipient list for both SMS and MMS. final Conversation conv = mConversation; String msgTxt = mText.toString(); if (requiresMms() || addressContainsEmailToMms(conv, msgTxt)) { // Make local copies of the bits we need for sending a message, // because we will be doing it off of the main thread, which will // immediately continue on to resetting some of this state. final Uri mmsUri = mMessageUri; final PduPersister persister = PduPersister .getPduPersister(mContext); final SlideshowModel slideshow = mSlideshow; final SendReq sendReq = makeSendReq(conv, mSubject); // Make sure the text in slide 0 is no longer holding onto a // reference to the text // in the message text box. slideshow.prepareForSend(); // Do the dirty work of sending the message off of the main UI // thread. new Thread(new Runnable() { public void run() { sendMmsWorker(conv, mmsUri, persister, slideshow, sendReq); } }).start(); } else { // Same rules apply as above. final String msgText = mText.toString(); new Thread(new Runnable() { public void run() { sendSmsWorker(conv, msgText); } }).start(); } // update the Recipient cache with the new to address, if it's different RecipientIdCache .updateNumbers(conv.getThreadId(), conv.getRecipients()); // Mark the message as discarded because it is "off the market" after // being sent. mDiscarded = true; }  

粗浅的解说一下， 
(1) prapareForSave. 先确保有slidshow,也就是实质内容。 确保文字已拷贝。确保标题。 
(2a) 根据消息分类，如果是短信直接起一个线程，跑sendSmsWorker函数，发送短信 
(2b) 如果是彩信，先跑这么个函数，确保文本信息 
            // Make sure the text in slide 0 is no longer holding onto a  // reference to the text      // in the message text box. 
            slideshow.prepareForSend(); 
TheCranberriers（卡百利）的歌真好听。 
然后起一个线程，单独跑sendMmsWorker函数,后文有介绍。 
彩信比sms麻烦很多。从sendMmsWorker函数的参数就可以看出来：(conv, mmsUri, persister, slideshow, sendReq) 上下文，uri，PduPersister（彩信是用pdu的），slideshow包含了所有的彩信信息，sendreq包含了mime封装mms时的headers（在我的剥壳彩信2里面有提到）。包括了 ContentType("application/vnd.wap.multipart.related" ，from,to等信息 。 

(3)。 不管是短信还是彩信，起了那俩个worker函数之一就算发送信息成功了。 
最后修改Recipient cache， 重置标志位，过程就结束了。 


2。函数 sendMmsWorker  

private void sendMmsWorker(Conversation conv, Uri mmsUri, PduPersister persister, SlideshowModel slideshow, SendReq sendReq) { // First make sure we don't have too many outstanding unsent message. Cursor cursor = null; try { Log.d("GN@@@","mContext: "+mContext.toString()); Log.d("GN@@@","mContentResolver: "+mContentResolver.toString()); Log.d("GN@@@","Mms.Outbox.CONTENT_URI: "+Mms.Outbox.CONTENT_URI.toString()); cursor = SqliteWrapper.query(mContext, mContentResolver, Mms.Outbox.CONTENT_URI, MMS_OUTBOX_PROJECTION, null, null, null); if (cursor != null) { long maxMessageSize = MmsConfig .getMaxSizeScaleForPendingMmsAllowed() * MmsConfig.getMaxMessageSize(); long totalPendingSize = 0; while (cursor.moveToNext()) { totalPendingSize += cursor.getLong(MMS_MESSAGE_SIZE_INDEX); } if (totalPendingSize >= maxMessageSize) { unDiscard(); // it wasn't successfully sent. Allow it to be // saved as a draft. mStatusListener.onMaxPendingMessagesReached(); return; } } } finally { if (cursor != null) { cursor.close(); } } mStatusListener.onPreMessageSent(); // Make sure we are still using the correct thread ID for our // recipient set. long threadId = conv.ensureThreadId(); if (Log.isLoggable(LogTag.APP, Log.VERBOSE)) { LogTag.debug("sendMmsWorker: update draft MMS message " + mmsUri); } if (mmsUri == null) { // Create a new MMS message if one hasn't been made yet. mmsUri = createDraftMmsMessage(persister, sendReq, slideshow); } else { // Otherwise, sync the MMS message in progress to disk. updateDraftMmsMessage(mmsUri, persister, slideshow, sendReq); } // Be paranoid and clean any draft SMS up. deleteDraftSmsMessage(threadId); MessageSender sender = new MmsMessageSender(mContext, mmsUri, slideshow .getCurrentMessageSize()); try { if (!sender.sendMessage(threadId)) { // The message was sent through SMS protocol, we should // delete the copy which was previously saved in MMS drafts. SqliteWrapper.delete(mContext, mContentResolver, mmsUri, null, null); } // Make sure this thread isn't over the limits in message count Recycler.getMmsRecycler().deleteOldMessagesByThreadId(mContext, threadId); } catch (Exception e) { Log.e(TAG, "Failed to send message: " + mmsUri + ", threadId=" + threadId, e); } mStatusListener.onMessageSent(); }  

依旧是粗浅的解说： 
a )前面挺长一段代码，检查这个对话（conversation)之前还有没有未发送的信息，uri是Mms.Outbox.CONTENT_URI。 
这里需要提到一下MessageStatusListener，这个Interface接口实现在WorkingMessage.java里，而短信类的主题ComposeMessageActivity.java实现了这个接口，所以前者在一些状态改变的时候可以很方便的调用后者的一些函数，作相应的改动。主要是：onProtocolChanged彩信短信互切换，onAttachmentChanged福建改变，onPreMessageSent发消息前，onMessageSent发消息后。 
b) 
当然，这里调用了onPreMessageSent这个监听函数， 
然后ComposeMessageActivity 就会调用resetMessage函数 ，这个函数会调整显示，focus，软键盘等等。 
c） 
然后检查mmsUri。如果这个uri是空的话，直接造一个新的uri继续发送。这个真是让我叫亚灭爹。因为一开始不知道 
这个createDraftMmsMessage(persister, sendReq, slideshow);函数可以包含所有发送需要的信息，以为这么发出去太可怕了。 
如果uri不为空。 调用的是updateDraftMmsMessage(mmsUri, persister, slideshow, sendReq); 
总之功能是，把这个将发送的mms，存disk了，也就是存draft了。为什么要发送还要存draft呢，后面另会说,因为这个是我写这个文章前想要找的东西。。。这个过程还有一些信息写道mmsUri了。所以之后mmsUri就可以代表将发送的mms的全部信息。 
d）deleteDraftSmsMessage 删除草稿 
e）创建一个MmsMessageSender，用这个sender来调用sendMessage函数 
可以猜到的，Sms那边是SmsMessageSender，同样调用sendMessage函数 
通过这里之后，短信已经真的发掉了。 这个类后面有介绍。 
f）这里这个if相当搞笑，按正常流程下来，按理这里本来这里是一个彩信的发送，然后有一些数据在draft数据库，会在上面的流程中被移到send数据库。 
但是搞笑的地方来了：因为忽然发现函数返回值表示刚刚发送出去的其实是一个短信sms，而已。于是要把数据库里存着的draft删掉。 
我也不知道这个if里面的情况会不会发生，反正源码是这么写的，我只管不负责任直译。。。 
g)调用onMessageSent这个监听函数。调用ComposeMessageActivity的onMessageSent，这个函数功能是重新显示conversation list。 


3 MmsMessageSender.java类。在mms/transaction下面。实现了MessageSender接口。这个接口只有一个事儿，就是sendMessage并返回boolean的值。弱发送的是mms，返回true。若发送的是sms，返回false。出错返回啥？exception。 

我最先想要追踪的发送流程也在这里了。贴一些代码 

public MmsMessageSender(Context context, Uri location, long messageSize) { mContext = context; mMessageUri = location; mMessageSize = messageSize; if (mMessageUri == null) { throw new IllegalArgumentException("Null message URI."); } }  

public boolean sendMessage(long token) throws MmsException { // Load the MMS from the message uri PduPersister p = PduPersister.getPduPersister(mContext); GenericPdu pdu = p.load(mMessageUri); if (pdu.getMessageType() != PduHeaders.MESSAGE_TYPE_SEND_REQ) { throw new MmsException("Invalid message: " + pdu.getMessageType()); } SendReq sendReq = (SendReq) pdu; // Update headers. updatePreferencesHeaders(sendReq); // MessageClass. sendReq.setMessageClass(DEFAULT_MESSAGE_CLASS.getBytes()); // Update the 'date' field of the message before sending it. sendReq.setDate(System.currentTimeMillis() / 1000L); sendReq.setMessageSize(mMessageSize); p.updateHeaders(mMessageUri, sendReq); // Move the message into MMS Outbox p.move(mMessageUri, Mms.Outbox.CONTENT_URI); // Start MMS transaction service SendingProgressTokenManager .put(ContentUris.parseId(mMessageUri), token); mContext.startService(new Intent(mContext, TransactionService.class)); return true; }  

解说： 
现从PduPersister那里拿数据，包括需要拼装的发送报头和需要发送的数据信息。 
然后把要发送的信息相关数据从数据库的draft那里转移到send，表示已经发送。 
最后起一个TransactionService服务，这个服务也是从PduPersister里找，找到需要发送的数据，并通过不同的用户网络送出去。 
这块我猜一般人都没有改的需求。。 

4.   
createDraftMmsMessage(persister, sendReq, slideshow); 和 
updateDraftMmsMessage(mmsUri, persister, slideshow, sendReq); 这两个函数 

刨掉 try catch , createDraftMmsMessage 函数大概有这么几句： 

PduBody pb = slideshow.toPduBody(); sendReq.setBody(pb); Uri res = persister.persist(sendReq, Mms.Draft.CONTENT_URI); slideshow.sync(pb);  

updateDraftMmsMessage 函数大概有这么几句： 

persister.updateHeaders(uri, sendReq); final PduBody pb = slideshow.toPduBody(); persister.updateParts(uri, pb); slideshow.sync(pb);  

两个函数从本质上讲是一样的：把附件的东西以pdubody的形式存下来，另外就是更新uri。 
什么叫PduBody呢？ 厉害了。就是n个PduPart。什么叫PduPart呢？厉害了，就是数据库里的那个Part！ 那个part是什么？ 
那个最厉害了。数据库里的PART_1234455这种数据，文件名代表创建时间（在mediaModel产生时就进系统了），导出来就是源文件，比如图片文件，改个jpg就可以看了。 

sync函数不怎么动，无责任解说：把每个slide里面每个媒体跟真实文件位置对应上。 

slideshow.toPduBody();里面，用SMILDocument mDocumentCache; 
调用到SlideshowModel.java的 

／／其中context＝null。 isMakingCopy＝false。 document＝mDocumentCache private PduBody makePduBody(Context context, SMILDocument document, boolean isMakingCopy) { PduBody pb = new PduBody(); boolean hasForwardLock = false; for (SlideModel slide : mSlides) { for (MediaModel media : slide) { if (isMakingCopy) { if (media.isDrmProtected() && !media.isAllowedToForward()) { hasForwardLock = true; continue; } } PduPart part = new PduPart(); if (media.isText()) { TextModel text = (TextModel) media; // Don't create empty text part. if (TextUtils.isEmpty(text.getText())) { continue; } // Set Charset if it's a text media. part.setCharset(text.getCharset()); } // Set Content-Type. part.setContentType(media.getContentType().getBytes()); String src = media.getSrc(); String location; boolean startWithContentId = src.startsWith("cid:"); if (startWithContentId) { location = src.substring("cid:".length()); } else { location = src; } // Set Content-Location. part.setContentLocation(location.getBytes()); // Set Content-Id. if (startWithContentId) { // Keep the original Content-Id. part.setContentId(location.getBytes()); } else { int index = location.lastIndexOf("."); String contentId = (index == -1) ? location : location .substring(0, index); part.setContentId(contentId.getBytes()); } if (media.isDrmProtected()) { DrmWrapper wrapper = media.getDrmObject(); part.setDataUri(wrapper.getOriginalUri()); part.setData(wrapper.getOriginalData()); } else if (media.isText()) { part.setData(((TextModel) media).getText().getBytes()); } else if (media.isImage() || media.isVideo() || media.isAudio()) { part.setDataUri(media.getUri()); } else { Log.w(TAG, "Unsupport media: " + media); } pb.addPart(part); } } if (hasForwardLock && isMakingCopy && context != null) { Toast.makeText(context, context.getString(R.string.cannot_forward_drm_obj), Toast.LENGTH_LONG).show(); document = SmilHelper.getDocument(pb); } // Create and insert SMIL part(as the first part) into the PduBody. ByteArrayOutputStream out = new ByteArrayOutputStream(); SmilXmlSerializer.serialize(document, out); PduPart smilPart = new PduPart(); smilPart.setContentId("smil".getBytes()); smilPart.setContentLocation("smil.xml".getBytes()); smilPart.setContentType(ContentType.APP_SMIL.getBytes()); smilPart.setData(out.toByteArray()); pb.addPart(0, smilPart); return pb; }