我们先来看最简单的流程入手分析，即收件人只有一个，而且不是长短信的情况。

一、地址有效性检测

当点击发送按钮时，触发onClick事件：
[java] view plain copy

@ComposeMessageActivity.java
public void onClick(View v) {
if ((v == mSendButtonSms || v == mSendButtonMms) && isPreparedForSending()) {
//确认发送
confirmSendMessageIfNeeded();
} else if ((v == mRecipientsPicker)) {
launchMultiplePhonePicker();
}
}

然后进行 收件人地址信息的确认：
[java] view plain copy

private void confirmSendMessageIfNeeded() {
if (!isRecipientsEditorVisible()) {
//当前的收件人编辑框不可见，说明所发送的对象已经存在短信的会话，也说明当前的收件人地址是ok的
sendMessage(true);
return;
}
//判断是否为MMS
boolean isMms = mWorkingMessage.requiresMms();
if (mRecipientsEditor.hasInvalidRecipient(isMms)) {
//当前的收件人列表中包含无效地址
if (mRecipientsEditor.hasValidRecipient(isMms)) {
//当前的收件人列表中有无效地址和有效地址，提示用户是否忽略，只发送有效的地址
String title = getResourcesString(R.string.has_invalid_recipient,
mRecipientsEditor.formatInvalidNumbers(isMms));
new AlertDialog.Builder(this)
.setTitle(title)
.setMessage(R.string.invalid_recipient_message)
.setPositiveButton(R.string.try_to_send,
new SendIgnoreInvalidRecipientListener())
.setNegativeButton(R.string.no, new CancelSendingListener())
.show();
} else {
//当前的收件人列表中的地址全部无效，取消发送，提示用户
new AlertDialog.Builder(this)
.setTitle(R.string.cannot_send_message)
.setMessage(R.string.cannot_send_message_reason)
.setPositiveButton(R.string.yes, new CancelSendingListener())
.show();
}
} else {
//收件人地址都是有效的，发送
ContactList contacts = mRecipientsEditor.constructContactsFromInput(false);
mDebugRecipients = contacts.serialize();
sendMessage(true);
}
}

经过地址有效性检测后，通过sendMessage()继续流程，这里传递的bCheckEcmMode参数代表是否检查当前Phone的状态， 处于紧急状态时无法发送短信:
[java] view plain copy

private void sendMessage(boolean bCheckEcmMode) {
if (bCheckEcmMode) {
//判断当前是否为紧急呼叫模式
String inEcm = SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE);
if (Boolean.parseBoolean(inEcm)) {
try {
//紧急状态下，无法发送短彩信
startActivityForResult( new Intent(TelephonyIntents.ACTION_SHOW_NOTICE_ECM_BLOCK_OTHERS, null), REQUEST_CODE_ECM_EXIT_DIALOG);
return;
} catch (ActivityNotFoundException e) {
Log.e(TAG, "Cannot find EmergencyCallbackModeExitDialog", e);
}
}
}
//判断当前是否有短信正在发送
if (!mSendingMessage) {
//重置收件人控件的监听器
removeRecipientsListeners();
//进入WorkingMessage处理流程
mWorkingMessage.send(mDebugRecipients);
mSentMessage = true;
mSendingMessage = true;
addRecipientsListeners();
mScrollOnSend = true; // in the next onQueryComplete, scroll the list to the end.
}
// But bail out if we are supposed to exit after the message is sent.
if (mSendDiscreetMode) {
finish();
}
}

二、创建短彩信的发送线程

在sendMessage()中经过对当前紧急服务的处理，然后判断如果当前没有短信正在发送，则通过WorkingMessage发送短信。这里的WorkingMessage是处理当前所编辑的信息的工具类，没有父类，在ComposeMessageActivity界面被创建时或者短信被发送出去时创建， 主要负责区分短彩信的流程以及发送短信时UI的更新。
[java] view plain copy

@WorkingMessage.java
public void send(final String recipientsInUI) {
long origThreadId = mConversation.getThreadId();
removeSubjectIfEmpty(true /* notify */);
prepareForSave(true /* notify */);
//拿到当前的会话
final Conversation conv = mConversation;
String msgTxt = mText.toString();
if (requiresMms() || addressContainsEmailToMms(conv, msgTxt)) {
//彩信发送
if (MmsConfig.getUaProfUrl() == null) {
String err = "WorkingMessage.send MMS sending failure. mms_config.xml is " +
"missing uaProfUrl setting. uaProfUrl is required for MMS service, " +
"but can be absent for SMS.";
RuntimeException ex = new NullPointerException(err);
Log.e(TAG, err, ex);
// now, let's just crash.
throw ex;
}
final Uri mmsUri = mMessageUri;
final PduPersister persister = PduPersister.getPduPersister(mActivity);
final SlideshowModel slideshow = mSlideshow;
final CharSequence subject = mSubject;
final boolean textOnly = mAttachmentType == TEXT;
//彩信发送线程
new Thread(new Runnable() {
@Override
public void run() {
final SendReq sendReq = makeSendReq(conv, subject);
slideshow.prepareForSend();
sendMmsWorker(conv, mmsUri, persister, slideshow, sendReq, textOnly);
updateSendStats(conv);
}
}, "WorkingMessage.send MMS").start();
} else {
//短信发送流程
final String msgText = mText.toString();
new Thread(new Runnable() {
@Override
public void run() {
preSendSmsWorker(conv, msgText, recipientsInUI);
updateSendStats(conv);
}
}, "WorkingMessage.send SMS").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;
}

在上面的send流程中，WorkingMessage对短彩信进行分类， 分别创建子线程进行发送，本节我们只关注短信流程，他是在preSendSmsWorker()中被发送的：
[java] view plain copy

private void preSendSmsWorker(Conversation conv, String msgText, String recipientsInUI) {
UserHappinessSignals.userAcceptedImeText(mActivity);
//UI刷新
mStatusListener.onPreMessageSent();
//获取初始的线程ID
long origThreadId = conv.getThreadId();
//获取分配的线程ID
long threadId = conv.ensureThreadId();
String semiSepRecipients = conv.getRecipients().serialize();
// recipientsInUI can be empty when the user types in a number and hits send
if (LogTag.SEVERE_WARNING && ((origThreadId != 0 && origThreadId != threadId) || (!semiSepRecipients.equals(recipientsInUI) && !TextUtils.isEmpty(recipientsInUI)))) {
}else {
//发送短信
sendSmsWorker(msgText, semiSepRecipients, threadId);
//删除草稿
deleteDraftSmsMessage(threadId);
}
}

在上面的preSendSmsWorker中进行了四个处理：

1、更新UI(更新编辑框等控件)；

2、获取当前发送的ThreadID；

3、发送短信；

4、删除草稿；

接下来我们继续来看发送的过程：
[java] view plain copy

private void sendSmsWorker(String msgText, String semiSepRecipients, long threadId) {
//获取当前发送的收件人地址
String[] dests = TextUtils.split(semiSepRecipients, ";");
//获取MessageSender对象，传递进去4个参数分别为：收件人、信息文本、当前的threadId、SimID。
MessageSender sender = new SmsMessageSender(mActivity, dests, msgText, threadId);
try {
//通过MessageSender发送出去
sender.sendMessage(threadId);
// Make sure this thread isn't over the limits in message count
Recycler.getSmsRecycler().deleteOldMessagesByThreadId(mActivity, threadId);
} catch (Exception e) {
Log.e(TAG, "Failed to send SMS message, threadId=" + threadId, e);
}
//更新UI
mStatusListener.onMessageSent();
MmsWidgetProvider.notifyDatasetChanged(mActivity);
}

经过上面WorkingMessage的sendSmsWorker过程，创建了MessageSender对象，并通过该对象的sendMessage()方法将信息发送出去，并在发送之后再次更新UI界面(正在发送中)。

三、通过SmsMessageSender拆分多个收件人

上面创建的MessageSender对象，继承自MessageSender接口，主要方法只有三个：
[java] view plain copy

public boolean sendMessage(long token) throws MmsException {};
private boolean queueMessage(long token) throws MmsException {};
private String getOutgoingServiceCenter(long threadId) {};

他的主要作用就是 对当前收件人信息拆分后，把群发的短信构建成一个短信队列并保存在数据库中，然后通知SmsReceiverService将队列读取出来并发送出去。
下面来看其具体实现过程。
[java] view plain copy

@SmsMessageSender.java
public boolean sendMessage(long token) throws MmsException {
return queueMessage(token);
}
private boolean queueMessage(long token) throws MmsException {
if ((mMessageText == null) || (mNumberOfDests == 0)) {
//空信息不能发送
throw new MmsException("Null message body or dest.");
}
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(mContext);
boolean requestDeliveryReport = prefs.getBoolean(
MessagingPreferenceActivity.SMS_DELIVERY_REPORT_MODE,
DEFAULT_DELIVERY_REPORT_MODE);
//根据当前短信的收件人数目，遍历当前的发送队列
for (int i = 0; i < mNumberOfDests; i++) {
try {
//将当前要发送的短消息放入发送队列中
Sms.addMessageToUri(mContext.getContentResolver(),
Uri.parse("content://sms/queued"), mDests[i],
mMessageText, null, mTimestamp,
true /* read */,
requestDeliveryReport,
mThreadId);
} catch (SQLiteException e) {
if (LogTag.DEBUG_SEND) {
Log.e(TAG, "queueMessage SQLiteException", e);
}
SqliteWrapper.checkSQLiteException(mContext, e);
}
}
//通知SmsReceiverService发送短信
mContext.sendBroadcast(new Intent(SmsReceiverService.ACTION_SEND_MESSAGE,
null,
mContext,
SmsReceiver.class));
return false;
}

在上面这个过程中，将收件人地址拆分后，生成一个短信队列放入"content://sms/queued"中，然后给SmsReceiver发送了通知，这里的SmsReceiver作用仅仅是将该通知转发给SmsReceiverService而已：
[java] view plain copy

@SmsReceiver.java
public void onReceive(Context context, Intent intent) {
onReceiveWithPrivilege(context, intent, false);
}
protected void onReceiveWithPrivilege(Context context, Intent intent, boolean privileged) {
if (!privileged && intent.getAction().equals(Intents.SMS_DELIVER_ACTION)) {
return;
}
//将请求转交给SmsReceiverService来处理
intent.setClass(context, SmsReceiverService.class);
intent.putExtra("result", getResultCode());
beginStartingService(context, intent);
}

也就是说，SmsMessageSender将要发送的短信放入队列中之后，经过SmsReceiver将该消息发送给了SmsReceiverService，这里的SmsReceiverService是负责短信的收发的Service。
下面来看SmsReceiverService对于发送短消息的处理过程。
这个Service被创建时，会创建一个子线程(HandlerThread)以及该线程的Handler对象(ServiceHandler)：
[java] view plain copy

@SmsReceiverService.java
public void onCreate() {
//创建子线程处理各种消息
HandlerThread thread = new HandlerThread(TAG, Process.THREAD_PRIORITY_BACKGROUND);
thread.start();
mServiceLooper = thread.getLooper();
mServiceHandler = new ServiceHandler(mServiceLooper);
}

当该Service被启动时，就会对当前的请求进行处理：
[java] view plain copy

public int onStartCommand(Intent intent, int flags, int startId) {
mResultCode = intent != null ? intent.getIntExtra("result", 0) : 0;
//通知Handler处理当前的请求
Message msg = mServiceHandler.obtainMessage();
msg.arg1 = startId;
msg.obj = intent;
mServiceHandler.sendMessage(msg);
return Service.START_NOT_STICKY;
}

然后看当前Handler的处理： [java] view plain copy

private final class ServiceHandler extends Handler {
public ServiceHandler(Looper looper) {
super(looper);
}
@Override
public void handleMessage(Message msg) {
int serviceId = msg.arg1;
Intent intent = (Intent)msg.obj;
if (intent != null && MmsConfig.isSmsEnabled(getApplicationContext())) {
String action = intent.getAction();
int error = intent.getIntExtra("errorCode", 0);
if (MESSAGE_SENT_ACTION.equals(intent.getAction())) {
handleSmsSent(intent, error);
} else if (SMS_DELIVER_ACTION.equals(action)) {
handleSmsReceived(intent, error);
} else if (ACTION_BOOT_COMPLETED.equals(action)) {
handleBootCompleted();
} else if (TelephonyIntents.ACTION_SERVICE_STATE_CHANGED.equals(action)) {
handleServiceStateChanged(intent);
} else if (ACTION_SEND_MESSAGE.endsWith(action)) {
//发送短信
handleSendMessage();
} else if (ACTION_SEND_INACTIVE_MESSAGE.equals(action)) {
handleSendInactiveMessage();
}
}
SmsReceiver.finishStartingService(SmsReceiverService.this, serviceId);
}
}

从上面的case分支中我们看到，对于当前的发送短信的请求( ACTION_SEND_MESSAGE)将会通过handleSendMessage()来处理： [java] view plain copy

private void handleSendMessage() {
if (!mSending) {
//当前没有其他任务时就触发发送的操作
sendFirstQueuedMessage();
}
}
public synchronized void sendFirstQueuedMessage() {
boolean success = true;
final Uri uri = Uri.parse("content://sms/queued");
ContentResolver resolver = getContentResolver();
//从队列中拿到要发送的短信
Cursor c = SqliteWrapper.query(this, resolver, uri, SEND_PROJECTION, null, null, "date ASC");
if (c != null) {
try {
//发送队列中第一条短信
if (c.moveToFirst()) {
String msgText = c.getString(SEND_COLUMN_BODY);
String address = c.getString(SEND_COLUMN_ADDRESS);
int threadId = c.getInt(SEND_COLUMN_THREAD_ID);
int status = c.getInt(SEND_COLUMN_STATUS);
int msgId = c.getInt(SEND_COLUMN_ID);
Uri msgUri = ContentUris.withAppendedId(Sms.CONTENT_URI, msgId);
//构建SmsSingleRecipientSender对象
SmsMessageSender sender = new SmsSingleRecipientSender(this,
address, msgText, threadId, status == Sms.STATUS_PENDING,
msgUri);
try {
//发送
sender.sendMessage(SendingProgressTokenManager.NO_TOKEN);;
mSending = true;
} catch (MmsException e) {
mSending = false;
messageFailedToSend(msgUri, SmsManager.RESULT_ERROR_GENERIC_FAILURE);
success = false;
sendBroadcast(new Intent(SmsReceiverService.ACTION_SEND_MESSAGE,
null,
this,
SmsReceiver.class));
}
}
} finally {
c.close();
}
}
if (success) {
unRegisterForServiceStateChanges();
}
}

我们看到，经过SmsReceiverService中Handler的处理，将数据库中的当前要发送的短信队列取出来，然后取出队列中第一个短消息任务，通过SmsSingleRecipientSender的sendMessage()方法发送出去。至此SmsReceiverService的流程就走完了，他的作用主要就是拿到队列中的第一条短消息，构建SmsSingleRecipientSender对象并发送出去。

四、通过SmsSingleRecipientSender拆分长短信

SmsSingleRecipientSender类继承自SmsMessageSender，他所提供的方法只有一个：
[java] view plain copy

public boolean sendMessage(long token) throws MmsException {};

其处理内容就是对长短消息进行分割。然后注册两个广播(一个用于广播当前正在发送，另一个广播短信的送达状态报告)，之后通过SmsManager发送出去。 [java] view plain copy

@SmsSingleRecipientSender.java
public boolean sendMessage(long token) throws MmsException {
if (mMessageText == null) {
throw new MmsException("Null message body or have multiple destinations.");
}
SmsManager smsManager = SmsManager.getDefault();
ArrayList messages = null;
//拆分长短信
if ((MmsConfig.getEmailGateway() != null) && (Mms.isEmailAddress(mDest) || MessageUtils.isAlias(mDest))) {
//彩信
String msgText;
msgText = mDest + " " + mMessageText;
mDest = MmsConfig.getEmailGateway();
messages = smsManager.divideMessage(msgText);
} else {
//短信
messages = smsManager.divideMessage(mMessageText);
mDest = PhoneNumberUtils.stripSeparators(mDest);
mDest = Conversation.verifySingleRecipient(mContext, mThreadId, mDest);
}
int messageCount = messages.size();
if (messageCount == 0) {
throw new MmsException("SmsMessageSender.sendMessage: divideMessage returned " + "empty messages. Original message is \"" + mMessageText + "\"");
}
boolean moved = Sms.moveMessageToFolder(mContext, mUri, Sms.MESSAGE_TYPE_OUTBOX, 0);
if (!moved) {
throw new MmsException("SmsMessageSender.sendMessage: couldn't move message " + "to outbox: " + mUri);
}
ArrayList deliveryIntents = new ArrayList(messageCount);
ArrayList sentIntents = new ArrayList(messageCount);
for (int i = 0; i < messageCount; i++) {
if (mRequestDeliveryReport && (i == (messageCount - 1))) {
//所有短信被发送完毕后，在最后一条短信后面添加送达报告的Intent
deliveryIntents.add(PendingIntent.getBroadcast(
mContext, 0,
new Intent(
MessageStatusReceiver.MESSAGE_STATUS_RECEIVED_ACTION,
mUri,
mContext,
MessageStatusReceiver.class),
0));
} else {
deliveryIntents.add(null);
}
//对于拆分后的短消息，需要在每条信息发送完毕后发送该Intent，从而接着发送剩下的拆分短信
Intent intent = new Intent(SmsReceiverService.MESSAGE_SENT_ACTION,
mUri,
mContext,
SmsReceiver.class);
int requestCode = 0;
if (i == messageCount -1) {
//收到该附加数据说明当前的拆分短信已经发送完毕
requestCode = 1;
intent.putExtra(SmsReceiverService.EXTRA_MESSAGE_SENT_SEND_NEXT, true);
}
sentIntents.add(PendingIntent.getBroadcast(mContext, requestCode, intent, 0));
}
try {
//发送
smsManager.sendMultipartTextMessage(mDest, mServiceCenter, messages, sentIntents, deliveryIntents);
} catch (Exception ex) {
throw new MmsException("SmsMessageSender.sendMessage: caught " + ex + " from SmsManager.sendTextMessage()");
}
return false;
}

经过上面的准备过程，在通过SmsManager发送信息之前，还添加了两个Intent：SmsReceiverService.MESSAGE_SENT_ACTION和MessageStatusReceiver.MESSAGE_STATUS_RECEIVED_ACTION。这两个Intent的作用分别是：
MESSAGE_STATUS_RECEIVED_ACTION:当所有长短信(或短消息)发送完毕后，发送该Intent。
MESSAGE_SENT_ACTION:分割后的短消息，每发送一条，都会发送该Intent， 当最后一条发送完毕后，将会在该Intent中附加EXTRA_MESSAGE_SENT_SEND_NEXT=true的数据。
具体细节在发送完毕后再分析。
接下来看SmsManager，这里的SmsManager是 单例模型，通过其自己的getDefault()或者getSmsManagerForSubscriber()方法就可以得到该对象。 [java] view plain copy

@SmsManager.java
public void sendMultipartTextMessage( String destinationAddress, String scAddress, ArrayList parts, ArrayList sentIntents, ArrayList deliveryIntents) {
if (TextUtils.isEmpty(destinationAddress)) {
throw new IllegalArgumentException("Invalid destinationAddress");
}
if (parts == null || parts.size() < 1) {
throw new IllegalArgumentException("Invalid message body");
}
if (parts.size() > 1) {
//长短信发送
try {
ISms iccISms = getISmsServiceOrThrow();
iccISms.sendMultipartText(ActivityThread.currentPackageName(),
destinationAddress, scAddress, parts,
sentIntents, deliveryIntents);
} catch (RemoteException ex) {
}
} else {
//普通短信发送
PendingIntent sentIntent = null;
PendingIntent deliveryIntent = null;
if (sentIntents != null && sentIntents.size() > 0) {
sentIntent = sentIntents.get(0);
}
if (deliveryIntents != null && deliveryIntents.size() > 0) {
deliveryIntent = deliveryIntents.get(0);
}
sendTextMessage(destinationAddress, scAddress, parts.get(0),
sentIntent, deliveryIntent);
}
}

在上面的流程中 区分了长短信和普通短信的流程，我们目前只分析普通短消息，继续看sendTextMessage()： [java] view plain copy

public void sendTextMessage( String destinationAddress, String scAddress, String text, PendingIntent sentIntent, PendingIntent deliveryIntent) {
if (TextUtils.isEmpty(destinationAddress)) {
throw new IllegalArgumentException("Invalid destinationAddress");
}
if (TextUtils.isEmpty(text)) {
throw new IllegalArgumentException("Invalid message body");
}
try {
//继续
ISms iccISms = getISmsServiceOrThrow();
iccISms.sendText(ActivityThread.currentPackageName(), destinationAddress, scAddress, text, sentIntent, deliveryIntent);
} catch (RemoteException ex) {
}
}

到这里，SmsMessage通过调用iccISms对象的sendText()方法将短信继续传递，而SmsMessage的流程就此结束。

五、发送单条短信

上面的iccISms对象是UiccSmsController的客户端：
[java] view plain copy

private static ISms getISmsService() {
return ISms.Stub.asInterface(ServiceManager.getService("isms"));
}

所以接下来我们需要进入UiccSmsController的流程中分析：
[java] view plain copy

@UiccSmsController.java
public void sendText(String callingPackage, String destAddr, String scAddr, String text, PendingIntent sentIntent, PendingIntent deliveryIntent) {
sendTextForSubscriber(getPreferredSmsSubscription(), callingPackage, destAddr, scAddr, text, sentIntent, deliveryIntent);
}
public void sendTextForSubscriber(long subId, String callingPackage, String destAddr, String scAddr, String text, PendingIntent sentIntent, PendingIntent deliveryIntent) {
IccSmsInterfaceManager iccSmsIntMgr = getIccSmsInterfaceManager(subId);
if (iccSmsIntMgr != null) {
//通过IccSmsInterfaceManager发送短信
iccSmsIntMgr.sendText(callingPackage, destAddr, scAddr, text, sentIntent, deliveryIntent);
} else {
}
}

在上面的UiccSmsController中将任务交给IccSmsInterfaceManager来继续处理。
IccSmsInterfaceManager这个类没有父类，他在创建PhoneProxy的时候进行初始化，其 作用是把请求发送给相应的处理者。比如对于sendText()将会转交给ImsSMSDispatcher来实现。 [java] view plain copy

@IccSmsInterfaceManager.java
public void sendText(String callingPackage, String destAddr, String scAddr, String text, PendingIntent sentIntent, PendingIntent deliveryIntent) {
//是否声明了发短信的权限
mPhone.getContext().enforceCallingPermission( Manifest.permission.SEND_SMS, "Sending SMS message");
//该操作是否被用户允许
if (mAppOps.noteOp(AppOpsManager.OP_SEND_SMS, Binder.getCallingUid(), callingPackage) != AppOpsManager.MODE_ALLOWED) {
return;
}
//调用ImsSMSDispatcher发送
destAddr = filterDestAddress(destAddr);
mDispatcher.sendText(destAddr, scAddr, text, sentIntent, deliveryIntent, null, callingPackage);
}

在上面这个过程中，先进行两级权限检查，然后通过ImsSMSDispatcher发送信息。
SMSDispatcher总共派生出三个子类：CdmaSMSDispatcher、GsmSMSDispatcher、ImsSMSDispatcher，在IccSmsInterfaceManager创建时只创建ImsSMSDispatcher，而在ImsSMSDispatcher创建过程中会对创建其他两种制式的SMSDispatcher，IccSmsInterfaceManager把请求发送给ImsSMSDispatcher后，由ImsSMSDispatcher根据当前网络状态选择使用CdmaSMSDispatcher还是GsmSMSDispatcher。 [java] view plain copy

@ImsSMSDispatcher.java
protected void sendText(String destAddr, String scAddr, String text, PendingIntent sentIntent, PendingIntent deliveryIntent, Uri messageUri, String callingPkg) {
//根据当前网络类型发送，我们只分析GSM
if (isCdmaMo()) {
mCdmaDispatcher.sendText(destAddr, scAddr,
text, sentIntent, deliveryIntent, messageUri, callingPkg);
} else {
mGsmDispatcher.sendText(destAddr, scAddr,
text, sentIntent, deliveryIntent, messageUri, callingPkg);
}
}

在上面的过程中，根据当前网络环境使用不同的SMSDispatcher，对于GSM网络来说，当前使用的是GsmSMSDispatcher对象。
这是Framework层与RILJ最接近的对象，他将请求发送给RILJ。 [java] view plain copy

@GsmSMSDispatcher.java
protected void sendText(String destAddr, String scAddr, String text, PendingIntent sentIntent, PendingIntent deliveryIntent, Uri messageUri, String callingPkg) {
//对短信内容进行编码
SmsMessage.SubmitPdu pdu = SmsMessage.getSubmitPdu( scAddr, destAddr, text, (deliveryIntent != null));
if (pdu != null) {
if (messageUri == null) {
if (SmsApplication.shouldWriteMessageForPackage(callingPkg, mContext)) {
//写入发件箱
messageUri = writeOutboxMessage(
getSubId(),
destAddr,
text,
deliveryIntent != null,
callingPkg);
}
} else {
//移到发件箱
moveToOutbox(getSubId(), messageUri, callingPkg);
}
HashMap map = getSmsTrackerMap(destAddr, scAddr, text, pdu);
//发送
SmsTracker tracker = getSmsTracker(map, sentIntent, deliveryIntent, getFormat(), messageUri, false);
sendRawPdu(tracker);
} else {
}
}

在上面的过程中，对短消息内容进行编码，然后把短消息写入(或移入)发件箱，然后利用当前的发地址、收地址、文本、附加Intent等信息创建SmsTracker对象，然后调用sendRawPdu()，这个方法是在GsmSMSDispatcher的父类SMSDispatcher中实现的： [java] view plain copy

@SMSDispatcher.java
protected void sendRawPdu(SmsTracker tracker) {
HashMap map = tracker.mData;
byte pdu[] = (byte[]) map.get("pdu");
if (mSmsSendDisabled) {
tracker.onFailed(mContext, RESULT_ERROR_NO_SERVICE, 0/*errorCode*/);
return;
}
if (pdu == null) {
tracker.onFailed(mContext, RESULT_ERROR_NULL_PDU, 0/*errorCode*/);
return;
}
PackageManager pm = mContext.getPackageManager();
String[] packageNames = pm.getPackagesForUid(Binder.getCallingUid());
if (packageNames == null || packageNames.length == 0) {
// Refuse to send SMS if we can't get the calling package name.
tracker.onFailed(mContext, RESULT_ERROR_GENERIC_FAILURE, 0/*errorCode*/);
return;
}
// Get package info via packagemanager
PackageInfo appInfo;
try {
// XXX this is lossy- apps can share a UID
appInfo = pm.getPackageInfo(packageNames[0], PackageManager.GET_SIGNATURES);
} catch (PackageManager.NameNotFoundException e) {
Rlog.e(TAG, "Can't get calling app package info: refusing to send SMS");
tracker.onFailed(mContext, RESULT_ERROR_GENERIC_FAILURE, 0/*errorCode*/);
return;
}
// checkDestination() returns true if the destination is not a premium short code or the
// sending app is approved to send to short codes. Otherwise, a message is sent to our
// handler with the SmsTracker to request user confirmation before sending.
if (checkDestination(tracker)) {
// check for excessive outgoing SMS usage by this app
if (!mUsageMonitor.check(appInfo.packageName, SINGLE_PART_SMS)) {
sendMessage(obtainMessage(EVENT_SEND_LIMIT_REACHED_CONFIRMATION, tracker));
return;
}
//发送
sendSms(tracker);
}
}

这里会对要发送的信息以及当前环境进行检测，然后进入sendSms()流程，这个方法又回到了GsmSMSDispatcher中实现： [java] view plain copy

@GsmSMSDispatcher.java
protected void sendSms(SmsTracker tracker) {
HashMap map = tracker.mData;
byte pdu[] = (byte[]) map.get("pdu");
if (tracker.mRetryCount > 0) {
// per TS 23.040 Section 9.2.3.6: If TP-MTI SMS-SUBMIT (0x01) type
// TP-RD (bit 2) is 1 for retry
// and TP-MR is set to previously failed sms TP-MR
if (((0x01 & pdu[0]) == 0x01)) {
pdu[0] |= 0x04; // TP-RD
pdu[1] = (byte) tracker.mMessageRef; // TP-MR
}
}
// Send SMS via the carrier app.
BroadcastReceiver resultReceiver = new SMSDispatcherReceiver(tracker);
Intent intent = new Intent(Intents.SMS_SEND_ACTION);
String carrierPackage = getCarrierAppPackageName(intent);
if (carrierPackage != null) {
intent.setPackage(carrierPackage);
intent.putExtra("pdu", pdu);
intent.putExtra("smsc", (byte[]) map.get("smsc"));
intent.putExtra("format", getFormat());
if (tracker.mSmsHeader != null && tracker.mSmsHeader.concatRef != null) {
SmsHeader.ConcatRef concatRef = tracker.mSmsHeader.concatRef;
intent.putExtra("concat.refNumber", concatRef.refNumber);
intent.putExtra("concat.seqNumber", concatRef.seqNumber);
intent.putExtra("concat.msgCount", concatRef.msgCount);
}
intent.addFlags(Intent.FLAG_RECEIVER_NO_ABORT);
Rlog.d(TAG, "Sending SMS by carrier app.");
mContext.sendOrderedBroadcast(intent, android.Manifest.permission.RECEIVE_SMS,
AppOpsManager.OP_RECEIVE_SMS, resultReceiver,
null, Activity.RESULT_CANCELED, null, null);
} else {
//发送
sendSmsByPstn(tracker);
}
}

然后来看sendSmsByPstn(): [java] view plain copy

protected void sendSmsByPstn(SmsTracker tracker) {
int ss = mPhone.getServiceState().getState();
if (!isIms() && ss != ServiceState.STATE_IN_SERVICE) {
tracker.onFailed(mContext, getNotInServiceError(ss), 0/*errorCode*/);
return;
}
//拿到SmsTracker中保存的信息
HashMap map = tracker.mData;
byte smsc[] = (byte[]) map.get("smsc");
byte[] pdu = (byte[]) map.get("pdu");
Message reply = obtainMessage(EVENT_SEND_SMS_COMPLETE, tracker);
if (0 == tracker.mImsRetry && !isIms()) {
if (tracker.mRetryCount > 0) {
if (((0x01 & pdu[0]) == 0x01)) {
pdu[0] |= 0x04; // TP-RD
pdu[1] = (byte) tracker.mMessageRef; // TP-MR
}
}
if (tracker.mRetryCount == 0 && tracker.mExpectMore) {
//调用RILJ发送短信
mCi.sendSMSExpectMore(IccUtils.bytesToHexString(smsc),
IccUtils.bytesToHexString(pdu), reply);
} else {
mCi.sendSMS(IccUtils.bytesToHexString(smsc),
IccUtils.bytesToHexString(pdu), reply);
}
} else {
//通过IMS发送短信
mCi.sendImsGsmSms(IccUtils.bytesToHexString(smsc),
IccUtils.bytesToHexString(pdu), tracker.mImsRetry,
tracker.mMessageRef, reply);
// increment it here, so in case of SMS_FAIL_RETRY over IMS
// next retry will be sent using IMS request again.
tracker.mImsRetry++;
}
}

在上面的发送之前，将SmsTracker中的内容解析出来，通过RILJ发送出去。并且注册了该请求的回应消息EVENT_SEND_SMS_COMPLETE，用于处理短信接收时的流程。

以上就是普通单收件人，短信的发送流程。

整个过程的流程图如下：

下一节来介绍长短信的发送流程。

Source: http://blog.csdn.net/u010961631/article/details/50272705

Android短信发送流程之普通短信发送（原）

一、地址有效性检测

二、创建短彩信的发送线程

三、通过SmsMessageSender拆分多个收件人

四、通过SmsSingleRecipientSender拆分长短信

五、发送单条短信

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