android 短信的接收和发送处理

一初始化

手机开机初始化调用GSMPhone 构造函数。

GSMPhone (Context context, CommandsInterface ci, PhoneNotifier notifier, boolean unitTestMode)

创建 mSMS = new GsmSMSDispatcher(this);

该类继承于SMSDispatcher。类SMSDispatcher中构造函数中初始化了短信的消息

mCm.setOnNewSMS(this, EVENT_NEW_SMS, null);

mCm.setOnSmsStatus(this, EVENT_NEW_SMS_STATUS_REPORT, null);

mCm.setOnIccSmsFull(this, EVENT_ICC_FULL, null);

handleMessage定义了sms的消息处理函数

public void handleMessage(Message msg) {

……

case EVENT_NEW_SMS:

……

}

mSimSmsIntManager = new SimSmsInterfaceManager(this);

SimSmsInterfaceManager继承于IccSmsInterfaceManager 为Isms.stub的实现类.

在IccSmsInterfaceManager 类实现了 Isms.adil. 中定义的方法，以实现远程调用。

二短信发送

短信发送调用接口

SmsManager sms = SmsManager.getDefault();

sms.sendTextMessage(string1, null, string2, p, null);

sendTextMessage 调用 sendRawPdu。

在sendRawPdu中创建了

ISms iccISms = ISms.Stub.asInterface(ServiceManager.getService("isms"));

通过aidl接口，实例化 IccSmsInterfaceManager. 调用 smsDispatcher.java中

protected void sendRawPdu(byte[] smsc, byte[] pdu, PendingIntent sentIntent,

PendingIntent deliveryIntent) 函数。

而后通过stub 接口调用sendSMS 接口。

RIL.java 中 sendSMS

public void

sendSMS (String smscPDU, String pdu, Message result) {

RILRequest rr

= RILRequest.obtain(RIL_REQUEST_SEND_SMS, result);

…..

send(rr);

}

发送 RIL_REQUEST_SEND_SMS 的 Request 请求到rild层。

Rild与modem之间联系与其它应用类似，不再重复。

三短信的接收

Modem 与rild之间不再重复。从ril层中收到消息开始。

Ril.java中 rilReceiver 收到信短信消息processResponse(p); 收到短信属于主动上报

调用processUnsolicited函数。

private void processUnsolicited (Parcel p) {

………

case RIL_UNSOL_RESPONSE_NEW_SMS: ret = responseString(p); break;

…….

switch(response) {

case RIL_UNSOL_RESPONSE_NEW_SMS: {

…….

SmsMessage sms;

…….

sms = SmsMessage.newFromCMT(a);

if (mSMSRegistrant != null) {

mSMSRegistrant

.notifyRegistrant(new AsyncResult(null, sms, null));

}

break;

}

…….

}

mSMSRegistrant 调用到Registrant.java文件中notifyRegistrant方法。

internalNotifyRegistrant 调用sendMessage 方法。

public void notifyRegistrant(AsyncResult ar)

{

internalNotifyRegistrant (ar.result, ar.exception);

}

internalNotifyRegistrant 收到消息后将消息发送到消息队列。

/*package*/ void

internalNotifyRegistrant (Object result, Throwable exception)

{

Handler h = getHandler();

if (h == null) {

clear();

} else {

Message msg = Message.obtain();

msg.what = what;

msg.obj = new AsyncResult(userObj, result, exception);

h.sendMessage(msg);

}

sendMessage 依次调用Handler.java 文件中 sendMessage->sendMessageDelayed-> sendMessageAtTime 在 sendMessageAtTime中将该短信消息加入到消息队列中。

sent = queue.enqueueMessage(msg, uptimeMillis);

public boolean sendMessageAtTime(Message msg, long uptimeMillis)

{

boolean sent = false;

MessageQueue queue = mQueue;

if (queue != null) {

msg.target = this;

sent = queue.enqueueMessage(msg, uptimeMillis);

}

else {

RuntimeException e = new RuntimeException(

this + " sendMessageAtTime() called with no mQueue");

Log.w("Looper", e.getMessage(), e);

}

return sent;

}

Looper.java 中loop方法。用于将消息队列中消息dispatch出去。
public static final void loop() {

Looper me = myLooper();

MessageQueue queue = me.mQueue;

while (true) {

Message msg = queue.next(); // might block

//if (!me.mRun) {

// break;

//}

if (msg != null) {

if (msg.target == null) {

// No target is a magic identifier for the quit message.

return;

}

if (me.mLogging!= null) me.mLogging.println(

">>>>> Dispatching to " + msg.target + " "

+ msg.callback + ": " + msg.what

);

msg.target.dispatchMessage(msg);

if (me.mLogging!= null) me.mLogging.println(

"<<<<< Finished to " + msg.target + " "

+ msg.callback);

msg.recycle();

}

dispatchMessage函数调用当前handle的消息处理函数。

public void dispatchMessage(Message msg) {

if (msg.callback != null) {

handleCallback(msg);

} else {

if (mCallback != null) {

if (mCallback.handleMessage(msg)) {

return;

}

handleMessage(msg);

}

调用到smsDispatcher.java中

public void handleMessage(Message msg) {

AsyncResult ar;

switch (msg.what) {

case EVENT_NEW_SMS:

………

}

从而实现了对新收到的短信的处理。

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