android通话流程浅析RIL层

拨出电话流程：
1 在系统源码这个路径下/packages/apps/Phone/src/com/android/phone/DialtactsActivity.java
contacts的androidmanifest.xml android:process="android.process.acore"说明此应用程序运行在acore进程中。DialtactsActivity的intent-filter的action属性设置为main，catelog属性设置为launcher，所以此activity能出现, 首先启动的就是这个activity在主菜单中，并且是点击此应用程序的第一个界面。dialtactsactivity包含四个tab，分别由TwelveKeyDialer、RecentCallsListActivity，两个activity-alias DialtactsContactsEntryActivity和DialtactsFavoritesEntryActivity分别表示联系人和收藏tab，但是正真的联系人列表和收藏是由ContactsListActivity负责。
2
进入TwelveKeyDialer OnClick方法，按住的按钮id为： R.id.digits，执行
placecall()
Intent intent = new Intent(Intent.ACTION_CALL_PRIVILEGED,
Uri.fromParts("tel", number, null));
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
3、
intert.ACTION_CALL_PRIVILEGED实际字符串为android.intent.action.CALL_PRIVILEGED，通过查找知道了packegs/phone下面的androidmanifest.xml中PrivilegedOutgoingCallBroadcaster activity-alias设置了intent-filter，所以需要找到其targetactivity为OutgoingCallBroadcaster。所以进入OutgoingCallBroadcaster的
onCreate（）
//如果为紧急号码马上启动intent.setClass(this, InCallScreen.class); startActivity(intent);

Intent broadcastIntent = new Intent(Intent.ACTION_NEW_OUTGOING_CALL);

if (number != null) broadcastIntent.putExtra(Intent.EXTRA_PHONE_NUMBER, number);

broadcastIntent.putExtra(EXTRA_ALREADY_CALLED, callNow);

broadcastIntent.putExtra(EXTRA_ORIGINAL_URI, intent.getData().toString());

if (LOGV) Log.v(TAG, "Broadcasting intent " + broadcastIntent + ".");

sendOrderedBroadcast(broadcastIntent, PERMISSION, null, null,

Activity.RESULT_OK, number, null);
4、Intent.ACTION_NEW_OUTGOING_CALL实际字符串为android.intent.action.NEW_OUTGOING_CALL，通过查找知道了packegs/phone

下面的androidmanifest.xml中OutgoingCallReceiver Receiver接收此intent消息。找到OutgoingCallReceiver，执行

onReceive()函数

Intent newIntent = new Intent(Intent.ACTION_CALL, uri);

newIntent.putExtra(Intent.EXTRA_PHONE_NUMBER, number);

newIntent.setClass(context, InCallScreen.class);

newIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
5、请求拨号的java部分流程

onCreate(第一次)/onNewIntent(非第一次)

internalResolveIntent

placeCall(intent);

PhoneUtils.placeCall(mPhone, number, intent.getData());

phone.dial(number);

mCT.dial(newDialString);

dial(dialString, CommandsInterface.CLIR_DEFAULT);

cm.dial(pendingMO.address, clirMode, obtainCompleteMessage());//obtainCompleteMessage(EVENT_OPERATION_COMPLETE);

send(rr);

msg = mSender.obtainMessage(EVENT_SEND, rr);

acquireWakeLock();

msg.sendToTarget();

RILSender.handleMessage()

case EVENT_SEND:

...

s.getOutputStream().write(dataLength);

s.getOutputStream().write(data);//从这里流程跑到下面ril.cpp中监听部份

6、请求拨号的c/c++部分流程

6.1、初始化事件循环，启动串口监听，注册socket监听。

rild.c->main()

(1)、RIL_startEventLoop

//建立事件循环线程

ret = pthread_create(&s_tid_dispatch, &attr, eventLoop, NULL);

//注册进程唤醒事件回调

ril_event_set (&s_wakeupfd_event, s_fdWakeupRead, true,

processWakeupCallback, NULL);

rilEventAddWakeup (&s_wakeupfd_event);

//建立事件循环

ril_event_loop

for (;;) {

...

n = select(nfds, &rfds, NULL, NULL, ptv);

// Check for timeouts

processTimeouts();

// Check for read-ready

processReadReadies(&rfds, n);

// Fire away

firePending();

}
(2)、funcs = rilInit(&s_rilEnv, argc, rilArgv);//实际是通过动态加载动态库的方式执行reference-ril.c中的RIL_Init

//单独启动一个线程读取串口数据

ret = pthread_create(&s_tid_mainloop, &attr, mainLoop, NULL);

fd = open (s_device_path, O_RDWR);

ret = at_open(fd, onUnsolicited);

ret = pthread_create(&s_tid_reader, &attr, readerLoop, &attr);

RIL_requestTimedCallback(initializeCallback, NULL, &TIMEVAL_0);



在initializeCallback中执行的程序：

setRadioState (RADIO_STATE_OFF);

at_handshake();

/* note: we don't check errors here. Everything important will

be handled in onATTimeout and onATReaderClosed */

/* atchannel is tolerant of echo but it must */

/* have verbose result codes */

at_send_command("ATE0Q0V1", NULL);

/* No auto-answer */

at_send_command("ATS0=0", NULL);

...





//注册rild socket端口事件监听到事件循环中

(3)、RIL_register(funcs);

s_fdListen = android_get_control_socket(SOCKET_NAME_RIL);

ret = listen(s_fdListen, 4);

ril_event_set (&s_listen_event, s_fdListen, false,

listenCallback, NULL);//将此端口加入事件select队列

rilEventAddWakeup (&s_listen_event);



如果rild socket端口有数据来了将执行listencallback函数

listencallback

//为此客户端连接创建新的监听句柄，s_fdListen继续监听其他客户端的连接。

s_fdCommand = accept(s_fdListen, (sockaddr *) &peeraddr, &socklen);

ril_event_set (&s_commands_event, s_fdCommand, 1,

processCommandsCallback, p_rs);//将此端口加入事件select队列

rilEventAddWakeup (&s_commands_event);
6.2、socket监听，收到dial的socket请求

processCommandsCallback

//读数据到p_record中

ret = record_stream_get_next(p_rs, &p_record, &recordlen);

processCommandBuffer(p_record, recordlen);

p.setData((uint8_t *) buffer, buflen);

// status checked at end

status = p.readInt32(&request);

status = p.readInt32 (&token);//请求队列中的序号

pRI = (RequestInfo *)calloc(1, sizeof(RequestInfo));

pRI->token = token;



/*

包含#include "ril_commands.h"语句，结构体如下：

typedef struct {

int requestNumber;

void (*dispatchFunction) (Parcel &p, struct RequestInfo *pRI);

int(*responseFunction) (Parcel &p, void *response, size_t responselen);

} CommandInfo;

*/

pRI->pCI = &(s_commands[request]);

pRI->p_next = s_pendingRequests;

s_pendingRequests = pRI;

pRI->pCI->dispatchFunction(p, pRI);



//假设是接收了dial指令,pRI->PCI->dispatchFunction(p,pRI)，调用dispatchDial (p,pRI)

dispatchDial (p,pRI)

s_callbacks.onRequest(pRI->pCI->requestNumber, &dial, sizeof(dial), pRI);

in reference-ril.c onRequest()

...

switch (request) {

case RIL_REQUEST_DIAL:

requestDial(data, datalen, t);

asprintf(&cmd, "ATD%s%s;", p_dial->address, clir);

ret = at_send_command(cmd, NULL);

err = at_send_command_full (command, NO_RESULT, NULL, NULL, 0, pp_outResponse);

err = at_send_command_full_nolock(command, type, responsePrefix, smspdu,timeoutMsec, sponse);

err = writeline (command);

//此处等待，直到收到成功应答或失败的应答,如：ok,connect,error cme等

err = pthread_cond_wait(&s_commandcond, &s_commandmutex);

waiting....

waiting....



/* success or failure is ignored by the upper layer here.

it will call GET_CURRENT_CALLS and determine success that way */

RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);

p.writeInt32 (RESPONSE_SOLICITED);

p.writeInt32 (pRI->token);

errorOffset = p.dataPosition();

p.writeInt32 (e);

if (e == RIL_E_SUCCESS) {

/* process response on success */

ret = pRI->pCI->responseFunction(p, response, responselen);

if (ret != 0) {

p.setDataPosition(errorOffset);

p.writeInt32 (ret);

}

}

sendResponse(p);

sendResponseRaw(p.data(), p.dataSize());

blockingWrite(fd, (void *)&header, sizeof(header));

blockingWrite(fd, data, dataSize);



6.4、串口监听收到atd命令的应答"OK"或"no carrier"等

readerLoop()

line = readline();

processLine(line);

handleFinalResponse(line);

pthread_cond_signal(&s_commandcond);//至此，前面的等待结束，接着执行RIL_onRequestComplete函数



6.5、java层收到应答后的处理,以dial为例子.

ril.java->RILReceiver.run()

for(;;)

{

...

length = readRilMessage(is, buffer);

p = Parcel.obtain();

p.unmarshall(buffer, 0, length);

p.setDataPosition(0);

processResponse(p);

type = p.readInt();

if (type == RESPONSE_SOLICITED) {

processSolicited (p);

serial = p.readInt();

rr = findAndRemoveRequestFromList(serial);

rr.mResult.sendToTarget();

......

}



CallTracker.java->handleMessage (Message msg)

switch (msg.what) {

case EVENT_OPERATION_COMPLETE:

ar = (AsyncResult)msg.obj;

operationComplete();

cm.getCurrentCalls(lastRelevantPoll);

第二部分：unsolicited 消息从modem上报到java的流程。
c++部份

readerLoop()

line = readline();

processLine(line);

handleUnsolicited(line);

if (s_unsolHandler != NULL) {

s_unsolHandler (line1, line2);//实际执行的是void onUnsolicited (const char *s, const char *sms_pdu)

if (strStartsWith(s,"+CRING:")

|| strStartsWith(s,"RING")

|| strStartsWith(s,"NO CARRIER")

|| strStartsWith(s,"+CCWA")

)

RIL_onUnsolicitedResponse (RIL_UNSOL_RESPONSE_CALL_STATE_CHANGED, NULL, 0);

p.writeInt32 (RESPONSE_UNSOLICITED);

p.writeInt32 (unsolResponse);

ret = s_unsolResponses[unsolResponseIndex].responseFunction(p, data, datalen);

ret = sendResponse(p);

sendResponseRaw(p.data(), p.dataSize());

ret = blockingWrite(fd, (void *)&header, sizeof(header));

blockingWrite(fd, data, dataSize);



java部份

ril.java->RILReceiver.run()

for(;;)

{

...

length = readRilMessage(is, buffer);

p = Parcel.obtain();

p.unmarshall(buffer, 0, length);

p.setDataPosition(0);

processResponse(p);

processUnsolicited (p);

response = p.readInt();

switch(response) {

...

case RIL_UNSOL_RESPONSE_CALL_STATE_CHANGED: ret = responseVoid(p); break;

...

}

switch(response) {

case RIL_UNSOL_RESPONSE_CALL_STATE_CHANGED:

if (RILJ_LOGD) unsljLog(response);



mCallStateRegistrants

.notifyRegistrants(new AsyncResult(null, null, null));

...

}
第三部分、第四部分：猫相关的各种状态的监听和通知机制／通话相关的图标变换的工作原理。
网络状态，edge,gprs图标的处理
a、注册监听部分
==>SystemServer.java
init2()
Thread thr = new ServerThread();
thr.setName("android.server.ServerThread");
thr.start();
ServerThread.run()
com.android.server.status.StatusBarPolicy.installIcons(context, statusBar);
sInstance = new StatusBarPolicy(context, service);
// phone_signal
mPhone = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
mPhoneData = IconData.makeIcon("phone_signal",
null, com.android.internal.R.drawable.stat_sys_signal_null, 0, 0);
mPhoneIcon = service.addIcon(mPhoneData, null);
// register for phone state notifications.
((TelephonyManager)mContext.getSystemService(Context.TELEPHONY_SERVICE))
.listen(mPhoneStateListener,
PhoneStateListener.LISTEN_SERVICE_STATE
| PhoneStateListener.LISTEN_SIGNAL_STRENGTH
| PhoneStateListener.LISTEN_CALL_STATE
| PhoneStateListener.LISTEN_DATA_CONNECTION_STATE
| PhoneStateListener.LISTEN_DATA_ACTIVITY);
//实际是调用的是TelephonyRegistry.listen，此listen函数会将Iphonestatelistener添加到对应的的handler数组中，到时来了事件会轮询回调。
// data_connection
mDataData = IconData.makeIcon("data_connection",
null, com.android.internal.R.drawable.stat_sys_data_connected_g, 0, 0);
mDataIcon = service.addIcon(mDataData, null);
service.setIconVisibility(mDataIcon, false);
b、事件通知部分
==>PhoneFactory.java
makeDefaultPhones()
sPhoneNotifier = new DefaultPhoneNotifier();
useNewRIL(context);
phone = new GSMPhone(context, new RIL(context), sPhoneNotifier);
for example
==>DataConnectionTracker.java
notifyDefaultData(String reason)
phone.notifyDataConnection(reason);
mNotifier.notifyDataConnection(this, reason);
==>DefaultPhoneNotifier.java
mRegistry = ITelephonyRegistry.Stub.asInterface(ServiceManager.getService(
"telephony.registry"));
mRegistry.notifyDataConnection(convertDataState(sender.getDataConnectionState()),
sender.isDataConnectivityPossible(), reason, sender.getActiveApn(),
sender.getInterfaceName(null));

第五部分：gprs拨号上网的通路原理。
上层java程序调用gprs流程：
=>PhoneApp.java
onCreate()
PhoneFactory.makeDefaultPhones(this);
phone = new GSMPhone(context, new SimulatedCommands(), sPhoneNotifier);
mDataConnection = new DataConnectionTracker (this);
createAllPdpList();//建立缺省pdpconnection
pdp = new PdpConnection(phone);
dataLink = new PppLink(phone.mDataConnection);
dataLink.setOnLinkChange(this, EVENT_LINK_STATE_CHANGED, null);

//某个条件触发执行
trySetupData(String reason)
setupData(reason);
pdp = findFreePdp();
Message msg = obtainMessage();
msg.what = EVENT_DATA_SETUP_COMPLETE;
msg.obj = reason;
pdp.connect(apn, msg);
phone.mCM.setupDefaultPDP(apn.apn, apn.user, apn.password,
obtainMessage(EVENT_SETUP_PDP_DONE));

//收到EVENT_SETUP_PDP_DONE消息
=>pdpconnection.java
handleMessage()
case EVENT_SETUP_PDP_DONE:
dataLink.connect();//dataLink是pppLink.java
SystemService.start(SERVICE_PPPD_GPRS);//启动pppd_grps服务
poll.what = EVENT_POLL_DATA_CONNECTION;
sendMessageDelayed(poll, POLL_SYSFS_MILLIS);//启动轮询，看是否成功连接gprs
checkPPP()//每隔5秒轮询，看是否连接成功，或断开
//如果已经连接
mLinkChangeRegistrant.notifyResult(LinkState.LINK_UP);
//执行到pdpconnection.handleMessage()
case EVENT_LINK_STATE_CHANGED
onLinkStateChanged(ls);
case LINK_UP:
notifySuccess(onConnectCompleted);
onCompleted.sendToTarget();

//执行dataConnectionTracker.java的handleMessage()
case EVENT_DATA_SETUP_COMPLETE
notifyDefaultData(reason);
setupDnsProperties();
setState(State.CONNECTED);
phone.notifyDataConnection(reason);
startNetStatPoll();
resetPollStats();
1、读取发送出去的包数和接受到的包数
2、如果发送的数据包且没有收到应答包数n大于等于看门狗追踪的限定包数。
2.1、开始轮询pdp context list，尝试恢复网络连接
2.2、如果轮询24次后还没有联通网络则停止网络状态轮询，进行一次ping实验。
2.2.1、如果ping成功则，重新进行网络状态轮询，否则发送EVENT_START_RECOVERY事件。
// reset reconnect timer
nextReconnectDelay = RECONNECT_DELAY_INITIAL_MILLIS;
着重c++部分代码的角度分析
＝>DataConnectionTracker.java
trySetupData(String reason)
setupData(reason);
＝>PdpConnection.java
pdp.connect(apn, msg);
=>RIL.J***A
phone.mCM.setupDefaultPDP(apn.apn, apn.user, apn.password,
obtainMessage(EVENT_SETUP_PDP_DONE));
send(rr);
//send socket to RIL

//enter c++ layer
=>ril.cpp
processCommandsCallback (int fd, short flags, void *param)
processCommandBuffer(p_record, recordlen);
status = p.readInt32(&request);
pRI->pCI = &(s_commands[request]);
pRI->pCI->dispatchFunction(p, pRI);
dispatchStrings();
s_callbacks.onRequest(pRI->pCI->requestNumber, pStrings, datalen, pRI);
=>reference-ril.c
onRequest();
requestSetupDefaultPDP(data, datalen, t);
err = write_at_to_data_channel("ATD*99***1#",1);

//after a while.get "connect" from data channel,so need to send socket message to java layer.
p.writeInt32 (RESPONSE_SOLICITED);
p.writeInt32 (pRI->token);//the serial No in the request list.
errorOffset = p.dataPosition();
p.writeInt32 (e);
if (e == RIL_E_SUCCESS) {
/* process response on success */
ret = pRI->pCI->responseFunction(p, response, responselen);
/* if an error occurred, rewind and mark it */
if (ret != 0) {
p.setDataPosition(errorOffset);
p.writeInt32 (ret);
}
}
sendResponse(p);
sendResponseRaw(p.data(), p.dataSize());
ret = blockingWrite(fd, (void *)&header, sizeof(header));
blockingWrite(fd, data, dataSize);

=>RIL.J***A
RILReceiver.run();
length = readRilMessage(is, buffer);
p = Parcel.obtain();
p.unmarshall(buffer, 0, length);
p.setDataPosition(0);
processResponse(p);
processSolicited (p);
serial = p.readInt();
error = p.readInt();
rr = findAndRemoveRequestFromList(serial);
ret = responseStrings(p);
if (rr.mResult != null) {
AsyncResult.forMessage(rr.mResult, ret, null);
rr.mResult.sendToTarget();
}

=>pdpConnection.java
handleMessage()
case EVENT_SETUP_PDP_DONE:
...
dataLink.connect();
=>pppLink.java
SystemProperties.set(PROPERTY_PPPD_EXIT_CODE, "");
SystemService.start(SERVICE_PPPD_GPRS);//启动pppd_grps服务
poll.what = EVENT_POLL_DATA_CONNECTION;
sendMessageDelayed(poll, POLL_SYSFS_MILLIS);
dataConnection.state = State.CONNECTING;
handleMessage()
case EVENT_POLL_DATA_CONNECTION
checkPPP();
if (ArrayUtils.equals(mCheckPPPBuffer, UP_ASCII_STRING, UP_ASCII_STRING.length)
|| ArrayUtils.equals(mCheckPPPBuffer, UNKNOWN_ASCII_STRING,
UNKNOWN_ASCII_STRING.length)
&& dataConnection.state == State.CONNECTING)
if (mLinkChangeRegistrant != null) {
mLinkChangeRegistrant.notifyResult(LinkState.LINK_UP);
=>pdpConnection.java
handleMessage()
case EVENT_LINK_STATE_CHANGED:
DataLink.LinkState ls = (DataLink.LinkState) ar.result;
onLinkStateChanged(ls);
case LINK_UP:
notifySuccess(onConnectCompleted);
AsyncResult.forMessage(onCompleted);
onCompleted.sendToTarget();

=>DataConnectionTracker.java
handleMessage()
case EVENT_DATA_SETUP_COMPLETE:
...
SystemProperties.set("gsm.defaultpdpcontext.active", "true");
notifyDefaultData(reason);
setupDnsProperties();//设置dns，gw，我们的实现方式是在pppd中设置的，不用pppd拨号的适用。
setState(State.CONNECTED);
phone.notifyDataConnection(reason);
mNotifier.notifyDataConnection(this, reason);
＝>DefaultPhoneNotifier.java
//mRegistry = ITelephonyRegistry.Stub.asInterface(ServiceManager.getService(
"telephony.registry"));构造函数中初始化了mRegistry
mRegistry.notifyDataConnection(convertDataState(sender.getDataConnectionState()),
sender.isDataConnectivityPossible(), reason, sender.getActiveApn(),
sender.getInterfaceName(null));
startNetStatPoll();
}
第六部分：通话相关的语音通路切换原理、震动接口
6、语音通路

6.1、设置语音通路的路由

目前我们有两处处理:

a、CallTracker.java中的

handlePollCalls（）

检测到＋clcc返回的电话列表中有状态为DriverCall.State.ALERTING(表示拨打电话后，对方已经振铃)，此时需要设置语音通路为MODE_IN_CALL



b、PhoneUtils.java中setAudioMode（）函数



c、调用通路分析

AudioManager audioManager = (AudioManager) context.getSystemService

(Context.AUDIO_SERVICE);

audioManager.setMode(mode);

AudioManager.setMode(mode);

AudioService.setMode(mode);

AudioSystem.setMode(mode);（native function)

android_media_AudioSystem.cpp==>android_media_AudioSystem_setMode()

AudioSystem.cpp==>setMode()

const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();

binder = sm->getService(String16("media.audio_flinger"));

...

gAudioFlinger = interface_cast<IAudioFlinger>(binder);

...

return gAudioFlinger;

通过查找“media.audio_flinger”发现AudioFlinger.cpp==>instantiate()//Main_mediaserver.cpp中被实例化。

defaultServiceManager()->addService(String16("media.audio_flinger"), new AudioFlinger());

mAudioHardware = AudioHardwareInterface::create();

LOGV("Creating Vendor Specific AudioHardware");

hw = createAudioHardware();

return new AudioHardwareMarvell();





return af->setMode(mode);

AudioHardwareLittle.cpp==>setMode(mode)

doRouting();

enable_incall_headphone()//or others...

system("alsactl -f /etc/alsactl/asound.state_none restore");

system("alsactl -f /etc/alsactl/asound.state_headset_r_s restore");



6.2、来电播放振铃,挂断或接听停止振铃。

==>Phone.app

onCreate()

ringer = new Ringer(phone);

Vibrator mVibrator = new Vibrator();

mService = IHardwareService.Stub.asInterface(ServiceManager.getService("hardware"));

notifier = new CallNotifier(this, phone, ringer, mBtHandsfree);

mPhone.registerForIncomingRing(this, PHONE_INCOMING_RING, null);

mPhone.registerForPhoneStateChanged(this, PHONE_STATE_CHANGED, null);

mPhone.registerForDisconnect(this, PHONE_DISCONNECT, null);

...

case PHONE_INCOMING_RING:

mRinger.ring();

mHardwareService.setAttentionLight(true);

mVibratorThread.start();

while (mContinueVibrating) {

mVibrator.vibrate(VIBRATE_LENGTH);

SystemClock.sleep(VIBRATE_LENGTH + PAUSE_LENGTH);

}

...

makeLooper();

mRingHandler.sendEmptyMessage(PLAY_RING_ONCE);

...

case PLAY_RING_ONCE:

PhoneUtils.setAudioMode(mContext, AudioManager.MODE_RINGTONE);

r.play();

...

case PHONE_DISCONNECT:

case PHONE_STATE_CHANGED:

...

mRinger.stopRing();

Message msg = mRingHandler.obtainMessage(STOP_RING);

msg.obj = mRingtone;

mRingHandler.sendMessage(msg);



case STOP_RING:

r.stop();

getLooper().quit();

...

mVibrator.cancel();
第七部分：通话相关的notification服务
7、通话相关的notification服务。

7.1、NotificationMgr

==>PhoneApp.java

onCreate()

NotificationMgr.init(this)//NotificationMgr.java//此类主要负责电话通知的具体表现（通知和取消通知），未接图标、通话中、蓝牙激活中、保持中，静音、免提等。封装了简单的瞬间显示文本消息的功能。提供漫游数据连接禁止的通知封装和漫游数据连接允许时取消通知

sMe = new NotificationMgr(context);

mNotificationMgr = (NotificationManager)

context.getSystemService(Context.NOTIFICATION_SERVICE);

mStatusBar = (StatusBarManager) context.getSystemService(Context.STATUS_BAR_SERVICE); //主要用于显示静音和speaker状态的图表（在状态条右边显示）

sMe.updateNotifications();//主要功能是：

1、查询是否有未读的未接听电话，并显示到状态栏图标，和通知列表

2、根据是否是电话状态，更新状态栏图表和通知列表（可能是激活，蓝牙，保持等）

7.2、CallNotifier

==>PhoneApp.java

onCreate()

notifier = new CallNotifier(this, phone, ringer, mBtHandsfree);//此类主要是监听通话相关的事件，然后进行例如来电播放铃声，震动。挂断、接听停止振铃等（调用Ringer类实现此功能)，根据不同的状态调用调用NotificationMgr进行具体的通知和取消通知。
第八部分： 通话相关的各种server
电话通信相关的服务：
(1)、从ServiceManager得到的：
a、wifiService
b、PhoneInterfaceManager
c、PhoneSubInfo
d、SimPhoneBookInterfaceManager
e、SimSmsInterfaceManager
f、TelephonyRegistry
g、NetStatService
h、ConnectivityService
(2)、从ApplicationContext得到的：
a、TelephonyManager