android 电话接听流程解析

Andriod通话处理流程

一、总览 
        1、从java端发送at命令的处理流程。 
        2、unsolicited 消息从modem上报到java的流程。 
        3、猫相关的各种状态的监听和通知机制。 
        4、通话相关的图标变换的工作原理。 
        5、gprs拨号上网的通路原理。 
        6、通话相关的语音通路切换原理、震动接口。 
        7、通话相关的notification服务。 
        8、通话相关的各种server。 

        第一部分：从java端发送at命令的处理流程。 

        拨出电话流程： 

        1、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 

java代码：

1. placecall() 
   
2. Intent intent = new Intent(Intent.ACTION_CALL_PRIVILEGED, 
   
3. Uri.fromParts("tel", number, null)); 
   
4. intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
   
5. startActivity(intent); 
   

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        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); 

java代码：

1. Intent broadcastIntent = new Intent(Intent.ACTION_NEW_OUTGOING_CALL); 
   
2. if (number != null) broadcastIntent.putExtra(Intent.EXTRA_PHONE_NUMBER, number); 
   
3. broadcastIntent.putExtra(EXTRA_ALREADY_CALLED, callNow); 
   
4. broadcastIntent.putExtra(EXTRA_ORIGINAL_URI, intent.getData().toString()); 
   
5. if (LOGV) Log.v(TAG, "Broadcasting intent " + broadcastIntent + "."); 
   
6. sendOrderedBroadcast(broadcastIntent, PERMISSION, null, null, 
   
7. Activity.RESULT_OK, number, null); 
   
8. 
   

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       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

java代码：

1. Intent newIntent = new Intent(Intent.ACTION_CALL, uri); 
   
2. newIntent.putExtra(Intent.EXTRA_PHONE_NUMBER, number); 
   
3. newIntent.setClass(context, InCallScreen.class); 
   
4. newIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
   
5. 
   

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5、请求拨号的java部分流程 
onCreate(第一次)/onNewIntent(非第一次) 

java代码：

1. internalResolveIntent 
   
2. placeCall(intent); 
   
3. PhoneUtils.placeCall(mPhone, number, intent.getData()); 
   
4. phone.dial(number); 
   
5. mCT.dial(newDialString); 
   
6. dial(dialString, CommandsInterface.CLIR_DEFAULT); 
   
7. cm.dial(pendingMO.address, clirMode, obtainCompleteMessage());//obtainCompleteMessage(EVENT_OPERATION_COMPLETE); 
   
8. send(rr); 
   
9. msg = mSender.obtainMessage(EVENT_SEND, rr); 
   
10. acquireWakeLock(); 
    
11. msg.sendToTarget(); 
    
12. RILSender.handleMessage() 
    
13. case EVENT_SEND: 
    
14. ... s.getOutputStream().write(dataLength); 
    
15. s.getOutputStream().write(data);//从这里流程跑到下面ril.cpp中监听部份 
    
16. 
    

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       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 

java代码：

1. //建立事件循环线程 
   
2. ret = pthread_create(&s_tid_dispatch, &attr, eventLoop, NULL); 
   
3. //注册进程唤醒事件回调 
   
4. ril_event_set (&s_wakeupfd_event, s_fdWakeupRead, true, 
   
5. processWakeupCallback, NULL); 
   
6. rilEventAddWakeup (&s_wakeupfd_event); 
   
7. //建立事件循环 
   
8. ril_event_loop 
   
9. for (;;) { 
   
10. ... 
    
11. n = select(nfds, &rfds, NULL, NULL, ptv); 
    
12. // Check for timeouts 
    
13. processTimeouts(); 
    
14. // Check for read-ready 
    
15. processReadReadies(&rfds, n); 
    
16. // Fire away 
    
17. firePending(); 
    
18. } 
    

//////////////////////////////////////////////////////////////////////////////////

   (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 

java代码：

1. 
   
2. //单独启动一个线程读取串口数据 
   
3. ret = pthread_create(&s_tid_mainloop, &attr, mainLoop, NULL); 
   
4. fd = open (s_device_path, O_RDWR); 
   
5. ret = at_open(fd, onUnsolicited); 
   
6. ret = pthread_create(&s_tid_reader, &attr, readerLoop, &attr); 
   
7. RIL_requestTimedCallback(initializeCallback, NULL, &TIMEVAL_0); 
   
8. 
   
9. 
   
10. //在initializeCallback中执行的程序： 
    
11. setRadioState (RADIO_STATE_OFF); 
    
12. at_handshake(); 
    
13. /* note: we don't check errors here. Everything important will 
    
14. be handled in onATTimeout and onATReaderClosed */ 
    
15. /* atchannel is tolerant of echo but it must */ 
    
16. /* have verbose result codes */ 
    
17. at_send_command("ATE0Q0V1", NULL); 
    
18. /* No auto-answer */ 
    
19. at_send_command("ATS0=0", NULL); 
    
20. ... 
    
21. //注册rild socket端口事件监听到事件循环中 
    

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       (3)、RIL_register(funcs); 

java代码：

1. s_fdListen = android_get_control_socket(SOCKET_NAME_RIL); 
   
2. ret = listen(s_fdListen, 4); 
   
3. ril_event_set (&s_listen_event, s_fdListen, false, 
   
4. listenCallback, NULL);//将此端口加入事件select队列 
   
5. rilEventAddWakeup (&s_listen_event); 
   
6. //如果rild socket端口有数据来了将执行listencallback函数 
   
7. listencallback 
   
8. //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。 
   
9. s_fdCommand = accept(s_fdListen, (sockaddr *) &peeraddr, &socklen); 
   
10. ril_event_set (&s_commands_event, s_fdCommand, 1, 
    
11. processCommandsCallback, p_rs);//将此端口加入事件select队列 
    
12. rilEventAddWakeup (&s_commands_event); 
    
13. 
    

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       6.2、socket监听，收到dial的socket请求

java代码：

1. processCommandsCallback 
   
2. //读数据到p_record中 
   
3. ret = record_stream_get_next(p_rs, &p_record, &recordlen); 
   
4. processCommandBuffer(p_record, recordlen); 
   
5. p.setData((uint8_t *) buffer, buflen); 
   
6. // status checked at end 
   
7. status = p.readInt32(&request); 
   
8. status = p.readInt32 (&token);//请求队列中的序号 
   
9. pRI = (RequestInfo *)calloc(1, sizeof(RequestInfo)); 
   
10. pRI->token = token; 
    
11. /* 
    
12. 包含#include "ril_commands.h"语句，结构体如下： 
    
13. typedef struct { 
    
14. int requestNumber; 
    
15. void (*dispatchFunction) (Parcel &p, struct RequestInfo *pRI); 
    
16. int(*responseFunction) (Parcel &p, void *response, size_t responselen); 
    
17. } CommandInfo; 
    
18. */ 
    
19. pRI->pCI = &(s_commands[request]); 
    
20. pRI->p_next = s_pendingRequests; 
    
21. s_pendingRequests = pRI; 
    
22. pRI->pCI->dispatchFunction(p, pRI); 
    
23. //假设是接收了dial指令,pRI->PCI->dispatchFunction(p,pRI)，调用dispatchDial (p,pRI) 
    
24. dispatchDial (p,pRI) 
    
25. s_callbacks.onRequest(pRI->pCI->requestNumber, &dial, sizeof(dial), pRI); 
    
26. in reference-ril.c onRequest() 
    
27. ... 
    
28. switch (request) { 
    
29. case RIL_REQUEST_DIAL: 
    
30. requestDial(data, datalen, t); 
    
31. asprintf(&cmd, "ATD%s%s;", p_dial->address, clir); 
    
32. ret = at_send_command(cmd, NULL); 
    
33. err = at_send_command_full (command, NO_RESULT, NULL, NULL, 0, pp_outResponse); 
    
34. err = at_send_command_full_nolock(command, type, responsePrefix, smspdu,timeoutMsec, sponse); 
    
35. err = writeline (command); 
    
36. //此处等待，直到收到成功应答或失败的应答,如：ok,connect,error cme等 
    
37. err = pthread_cond_wait(&s_commandcond, &s_commandmutex); 
    
38. waiting.... 
    
39. waiting.... 
    
40. /* success or failure is ignored by the upper layer here.it will call GET_CURRENT_CALLS and determine success that way */ 
    
41. RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0); 
    
42. p.writeInt32 (RESPONSE_SOLICITED); 
    
43. p.writeInt32 (pRI->token); 
    
44. errorOffset = p.dataPosition(); 
    
45. p.writeInt32 (e); 
    
46. if (e == RIL_E_SUCCESS) { 
    
47. /* process response on success */ 
    
48. ret = pRI->pCI->responseFunction(p, response, responselen); 
    
49. if (ret != 0) { 
    
50. p.setDataPosition(errorOffset); 
    
51. p.writeInt32 (ret); 
    
52. } 
    
53. } 
    
54. sendResponse(p); 
    
55. sendResponseRaw(p.data(), p.dataSize()); 
    
56. blockingWrite(fd, (void *)&header, sizeof(header)); 
    
57. blockingWrite(fd, data, dataSize); 
    
58. 
    

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       6.4、串口监听收到atd命令的应答"OK"或"no carrier"等 

java代码：

1. readerLoop() 
   
2. line = readline(); 
   
3. processLine(line); 
   
4. handleFinalResponse(line); 
   
5. pthread_cond_signal(&s_commandcond);//至此，前面的等待结束，接着执行RIL_onRequestComplete函数 
   
6. 
   

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       6.5、java层收到应答后的处理,以dial为例子. 

java代码：

1. ril.java->RILReceiver.run() 
   
2. for(;;) 
   
3. { 
   
4. ... 
   
5. length = readRilMessage(is, buffer); 
   
6. p = Parcel.obtain(); 
   
7. p.unmarshall(buffer, 0, length); 
   
8. p.setDataPosition(0); 
   
9. processResponse(p); 
   
10. type = p.readInt(); 
    
11. if (type == RESPONSE_SOLICITED) { 
    
12. processSolicited (p); 
    
13. serial = p.readInt(); 
    
14. rr = findAndRemoveRequestFromList(serial); 
    
15. rr.mResult.sendToTarget(); 
    
16. ...... 
    
17. } 
    
18. CallTracker.java->handleMessage (Message msg) 
    
19. switch (msg.what) { 
    
20. case EVENT_OPERATION_COMPLETE: 
    
21. ar = (AsyncResult)msg.obj; 
    
22. operationComplete(); 
    
23. cm.getCurrentCalls(lastRelevantPoll); 

///////////////////////////////////////////////////////////////////

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

java代码：

1. readerLoop() 
   
2. line = readline(); 
   
3. processLine(line); 
   
4. handleUnsolicited(line); 
   
5. if (s_unsolHandler != NULL) { 
   
6. s_unsolHandler (line1, line2);//实际执行的是void onUnsolicited (const char *s, const char *sms_pdu) 
   
7. if (strStartsWith(s,"+CRING:") 
   
8. || strStartsWith(s,"RING") 
   
9. || strStartsWith(s,"NO CARRIER") 
   
10. || strStartsWith(s,"+CCWA") 
    
11. ) 
    
12. RIL_onUnsolicitedResponse (RIL_UNSOL_RESPONSE_CALL_STATE_CHANGED, NULL, 0); 
    
13. p.writeInt32 (RESPONSE_UNSOLICITED); 
    
14. p.writeInt32 (unsolResponse); 
    
15. ret = s_unsolResponses[unsolResponseIndex].responseFunction(p, data, datalen); 
    
16. ret = sendResponse(p); 
    
17. sendResponseRaw(p.data(), p.dataSize()); 
    
18. ret = blockingWrite(fd, (void *)&header, sizeof(header)); 
    
19. blockingWrite(fd, data, dataSize); 
    

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       java部份

java代码：

1. ril.java->RILReceiver.run() 
   
2. for(;;){ 
   
3. 
   
4. length = readRilMessage(is, buffer); 
   
5. p = Parcel.obtain(); 
   
6. p.unmarshall(buffer, 0, length); 
   
7. p.setDataPosition(0); 
   
8. processResponse(p); 
   
9. processUnsolicited (p); 
   
10. response = p.readInt(); 
    
11. switch(response) { 
    
12. ... 
    
13. case RIL_UNSOL_RESPONSE_CALL_STATE_CHANGED: ret = responseVoid(p); break; 
    
14. ... 
    
15. } 
    
16. switch(response) { 
    
17. case RIL_UNSOL_RESPONSE_CALL_STATE_CHANGED: 
    
18. if (RILJ_LOGD) unsljLog(response); 
    
19. mCallStateRegistrants 
    
20. .notifyRegistrants(new AsyncResult(null, null, null)); 
    
21. ... 
    
22. } 
    
23. 
    

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       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

java代码：

1. ==>SystemServer.java 
   
2. init2() 
   
3. Thread thr = new ServerThread(); 
   
4. thr.setName("android.server.ServerThread"); 
   
5. thr.start(); 
   
6. ServerThread.run() com.android.server.status.StatusBarPolicy.installIcons(context, statusBar); 
   
7. sInstance = new StatusBarPolicy(context, service); 
   
8. // phone_signal 
   
9. mPhone = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE); 
   
10. mPhoneData = IconData.makeIcon("phone_signal", 
    
11. null, com.android.internal.R.drawable.stat_sys_signal_null, 0, 0); 
    
12. mPhoneIcon = service.addIcon(mPhoneData, null); 
    
13. // register for phone state notifications. 
    
14. ((TelephonyManager)mContext.getSystemService(Context.TELEPHONY_SERVICE)).listen(mPhoneStateListener, 
    
15. PhoneStateListener.LISTEN_SERVICE_STATE 
    
16. | PhoneStateListener.LISTEN_SIGNAL_STRENGTH 
    
17. | PhoneStateListener.LISTEN_CALL_STATE 
    
18. | PhoneStateListener.LISTEN_DATA_CONNECTION_STATE 
    
19. | PhoneStateListener.LISTEN_DATA_ACTIVITY); 
    
20. //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。 
    
21. // data_connection 
    
22. mDataData = IconData.makeIcon("data_connection", null, com.android.internal.R.drawable.stat_sys_data_connected_g, 0, 0); 
    
23. mDataIcon = service.addIcon(mDataData, null); 
    
24. service.setIconVisibility(mDataIcon, false); 
    
25. 
    
26. b、事件通知部分 
    
27. ==>PhoneFactory.java 
    
28. makeDefaultPhones() 
    
29. sPhoneNotifier = new DefaultPhoneNotifier(); 
    
30. useNewRIL(context); 
    
31. phone = new GSMPhone(context, new RIL(context), sPhoneNotifier); 
    
32. for example 
    
33. ==>DataConnectionTracker.java 
    
34. notifyDefaultData(String reason) 
    
35. phone.notifyDataConnection(reason); 
    
36. mNotifier.notifyDataConnection(this, reason); 
    
37. ==>DefaultPhoneNotifier.java 
    
38. mRegistry = ITelephonyRegistry.Stub.asInterface(ServiceManager.getService( 
    
39. "telephony.registry")); 
    
40. mRegistry.notifyDataConnection(convertDataState(sender.getDataConnectionState()), 
    
41. sender.isDataConnectivityPossible(), reason, sender.getActiveApn(), 
    
42. sender.getInterfaceName(null)); 

///////////////////////////////////////////////////////////////////////////////////////

   第四部分：gprs拨号上网的通路原理。 
       上层java程序调用gprs流程： 

java代码：

1. =>PhoneApp.java 
   
2. onCreate() 
   
3. PhoneFactory.makeDefaultPhones(this); 
   
4. phone = new GSMPhone(context, new SimulatedCommands(), sPhoneNotifier); 
   
5. mDataConnection = new DataConnectionTracker (this); 
   
6. createAllPdpList();//建立缺省pdpconnection 
   
7. pdp = new PdpConnection(phone); 
   
8. dataLink = new PppLink(phone.mDataConnection); 
   
9. dataLink.setOnLinkChange(this, EVENT_LINK_STATE_CHANGED, null); 
   
10. //某个条件触发执行 
    
11. trySetupData(String reason) 
    
12. setupData(reason); 
    
13. pdp = findFreePdp(); 
    
14. Message msg = obtainMessage(); 
    
15. msg.what = EVENT_DATA_SETUP_COMPLETE; 
    
16. msg.obj = reason; 
    
17. pdp.connect(apn, msg); 
    
18. phone.mCM.setupDefaultPDP(apn.apn, apn.user, apn.password, 
    
19. obtainMessage(EVENT_SETUP_PDP_DONE)); 
    
20. //收到EVENT_SETUP_PDP_DONE消息 
    
21. =>pdpconnection.java 
    
22. handleMessage() 
    
23. case EVENT_SETUP_PDP_DONE: 
    
24. dataLink.connect();//dataLink是pppLink.java 
    
25. SystemService.start(SERVICE_PPPD_GPRS);//启动pppd_grps服务 
    
26. poll.what = EVENT_POLL_DATA_CONNECTION; 
    
27. sendMessageDelayed(poll, POLL_SYSFS_MILLIS);//启动轮询，看是否成功连接gprscheckPPP()//每隔5秒轮询，看是否连接成功，或断开 
    
28. //如果已经连接 
    
29. mLinkChangeRegistrant.notifyResult(LinkState.LINK_UP); 
    
30. //执行到pdpconnection.handleMessage() 
    
31. case EVENT_LINK_STATE_CHANGED 
    
32. onLinkStateChanged(ls); 
    
33. case LINK_UP: 
    
34. notifySuccess(onConnectCompleted); 
    
35. onCompleted.sendToTarget(); 
    
36. //执行dataConnectionTracker.java的handleMessage() 
    
37. case EVENT_DATA_SETUP_COMPLETE 
    
38. notifyDefaultData(reason); 
    
39. setupDnsProperties(); 
    
40. setState(State.CONNECTED); 
    
41. phone.notifyDataConnection(reason); 
    
42. startNetStatPoll(); 
    
43. resetPollStats(); 
    

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       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

java代码：

1. 
   
2. ＝>DataConnectionTracker.java 
   
3. trySetupData(String reason) 
   
4. setupData(reason); 
   
5. ＝>PdpConnection.java 
   
6. pdp.connect(apn, msg); 
   
7. =>RIL.JAVA 
   
8. phone.mCM.setupDefaultPDP(apn.apn, apn.user, apn.password, 
   
9. obtainMessage(EVENT_SETUP_PDP_DONE)); 
   
10. send(rr); 
    
11. //send socket to RIL 
    
12. //enter c++ layer 
    
13. =>ril.cpp 
    
14. processCommandsCallback (int fd, short flags, void *param) 
    
15. processCommandBuffer(p_record, recordlen); 
    
16. status = p.readInt32(&request); 
    
17. pRI->pCI = &(s_commands[request]); 
    
18. pRI->pCI->dispatchFunction(p, pRI); 
    
19. dispatchStrings(); 
    
20. s_callbacks.onRequest(pRI->pCI->requestNumber, pStrings, datalen, pRI); 
    
21. =>reference-ril.c 
    
22. onRequest(); 
    
23. requestSetupDefaultPDP(data, datalen, t); 
    
24. err = write_at_to_data_channel("ATD*99***1#",1); 
    
25. //after a while.get "connect" from data channel,so need to send socket message to java layer. 
    
26. p.writeInt32 (RESPONSE_SOLICITED); 
    
27. p.writeInt32 (pRI->token);//the serial No in the request list. 
    
28. errorOffset = p.dataPosition(); 
    
29. p.writeInt32 (e); 
    
30. if (e == RIL_E_SUCCESS) { 
    
31. /* process response on success */ 
    
32. ret = pRI->pCI->responseFunction(p, response, responselen); 
    
33. /* if an error occurred, rewind and mark it */ 
    
34. if (ret != 0) { 
    
35. p.setDataPosition(errorOffset); 
    
36. p.writeInt32 (ret); 
    
37. } 
    
38. } 
    
39. sendResponse(p); 
    
40. sendResponseRaw(p.data(), p.dataSize()); 
    
41. ret = blockingWrite(fd, (void *)&header, sizeof(header)); 
    
42. blockingWrite(fd, data, dataSize); 
    
43. =>RIL.JAVA 
    
44. RILReceiver.run(); 
    
45. length = readRilMessage(is, buffer); 
    
46. p = Parcel.obtain(); 
    
47. p.unmarshall(buffer, 0, length); 
    
48. p.setDataPosition(0); 
    
49. processResponse(p); 
    
50. processSolicited (p); 
    
51. serial = p.readInt(); 
    
52. error = p.readInt(); 
    
53. rr = findAndRemoveRequestFromList(serial); 
    
54. ret = responseStrings(p); 
    
55. if (rr.mResult != null) { 
    
56. AsyncResult.forMessage(rr.mResult, ret, null); 
    
57. rr.mResult.sendToTarget(); 
    
58. } 
    
59. =>pdpConnection.java 
    
60. handleMessage() 
    
61. case EVENT_SETUP_PDP_DONE: 
    
62. ... 
    
63. dataLink.connect(); 
    
64. =>pppLink.java 
    
65. SystemProperties.set(PROPERTY_PPPD_EXIT_CODE, ""); 
    
66. SystemService.start(SERVICE_PPPD_GPRS);//启动pppd_grps服务 
    
67. poll.what = EVENT_POLL_DATA_CONNECTION; 
    
68. sendMessageDelayed(poll, POLL_SYSFS_MILLIS); 
    
69. dataConnection.state = State.CONNECTING; 
    
70. handleMessage() 
    
71. case EVENT_POLL_DATA_CONNECTION 
    
72. checkPPP(); 
    
73. if (ArrayUtils.equals(mCheckPPPBuffer, UP_ASCII_STRING, UP_ASCII_STRING.length) 
    
74. || ArrayUtils.equals(mCheckPPPBuffer, UNKNOWN_ASCII_STRING, 
    
75. UNKNOWN_ASCII_STRING.length) && dataConnection.state == State.CONNECTING) 
    
76. if (mLinkChangeRegistrant != null) { 
    
77. mLinkChangeRegistrant.notifyResult(LinkState.LINK_UP); 
    
78. =>pdpConnection.java 
    
79. handleMessage() 
    
80. case EVENT_LINK_STATE_CHANGED: 
    
81. DataLink.LinkState ls = (DataLink.LinkState) ar.result; 
    
82. onLinkStateChanged(ls); 
    
83. case LINK_UP: 
    
84. notifySuccess(onConnectCompleted); 
    
85. AsyncResult.forMessage(onCompleted); 
    
86. onCompleted.sendToTarget(); 
    
87. =>DataConnectionTracker.java 
    
88. handleMessage() 
    
89. case EVENT_DATA_SETUP_COMPLETE: 
    
90. ... SystemProperties.set("gsm.defaultpdpcontext.active", "true"); 
    
91. notifyDefaultData(reason); 
    
92. setupDnsProperties();
    
93. //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。 
    
94. setState(State.CONNECTED); 
    
95. phone.notifyDataConnection(reason); 
    
96. mNotifier.notifyDataConnection(this, reason); 
    
97. ＝>DefaultPhoneNotifier.java 
    
98. //mRegistry = ITelephonyRegistry.Stub.asInterface(ServiceManager.getService( 
    
99. "telephony.registry"));构造函数中初始化了mRegistry mRegistry.notifyDataConnection(convertDataState(sender.getDataConnectionState()), sender.isDataConnectivityPossible(), reason, sender.getActiveApn(), 
    
100. sender.getInterfaceName(null)); 
     
101. startNetStatPoll(); 
     
102. } 

//////////////////////////////////////////////////////////////////////////////////

 第五部分：通话相关的语音通路切换原理、震动接口 
        5、语音通路 
        5.1、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 

java代码：

1. AudioManager audioManager = (AudioManager) context.getSystemService 
   
2. (Context.AUDIO_SERVICE); 
   
3. audioManager.setMode(mode); 
   
4. AudioManager.setMode(mode); 
   
5. AudioService.setMode(mode); 
   
6. AudioSystem.setMode(mode);（native function) 
   
7. android_media_AudioSystem.cpp==>android_media_AudioSystem_setMode() 
   
8. AudioSystem.cpp==>setMode() 
   
9. const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger(); 
   
10. binder = sm->getService(String16("media.audio_flinger")); 
    
11. ... 
    
12. gAudioFlinger = interface_cast<IAudioFlinger>(binder); 
    
13. ... 
    
14. return gAudioFlinger; 
    

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

java代码：

1. defaultServiceManager()->addService(String16("media.audio_flinger"), new AudioFlinger()); 
   
2. mAudioHardware = AudioHardwareInterface::create(); 
   
3. LOGV("Creating Vendor Specific AudioHardware"); 
   
4. hw = createAudioHardware(); 
   
5. return new AudioHardwareMarvell(); 
   
6. return af->setMode(mode); 
   
7. AudioHardwareLittle.cpp==>setMode(mode) 
   
8. doRouting(); 
   
9. enable_incall_headphone()//or others... 
   
10. system("alsactl -f /etc/alsactl/asound.state_none restore"); 
    
11. system("alsactl -f /etc/alsactl/asound.state_headset_r_s restore"); 
    
12. 
    

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       5.2、来电播放振铃,挂断或接听停止振铃。 

java代码：

1. ==>Phone.app 
   
2. onCreate() 
   
3. ringer = new Ringer(phone); 
   
4. Vibrator mVibrator = new Vibrator(); 
   
5. mService = IHardwareService.Stub.asInterface(ServiceManager.getService("hardware")); 
   
6. notifier = new CallNotifier(this, phone, ringer, mBtHandsfree); 
   
7. mPhone.registerForIncomingRing(this, PHONE_INCOMING_RING, null); 
   
8. mPhone.registerForPhoneStateChanged(this, PHONE_STATE_CHANGED, null); 
   
9. mPhone.registerForDisconnect(this, PHONE_DISCONNECT, null); 
   
10. ... 
    
11. case PHONE_INCOMING_RING: 
    
12. mRinger.ring(); 
    
13. mHardwareService.setAttentionLight(true); 
    
14. mVibratorThread.start(); 
    
15. while (mContinueVibrating) { 
    
16. mVibrator.vibrate(VIBRATE_LENGTH); 
    
17. SystemClock.sleep(VIBRATE_LENGTH + PAUSE_LENGTH); 
    
18. } 
    
19. ... 
    
20. makeLooper(); 
    
21. mRingHandler.sendEmptyMessage(PLAY_RING_ONCE); 
    
22. ... 
    
23. case PLAY_RING_ONCE: 
    
24. PhoneUtils.setAudioMode(mContext,AudioManager.MODE_RINGTONE); 
    
25. r.play(); 
    
26. ... 
    
27. case PHONE_DISCONNECT: 
    
28. case PHONE_STATE_CHANGED: 
    
29. ... 
    
30. mRinger.stopRing(); 
    
31. Message msg = mRingHandler.obtainMessage(STOP_RING); 
    
32. msg.obj = mRingtone; 
    
33. mRingHandler.sendMessage(msg); 
    
34. case STOP_RING: 
    
35. r.stop(); 
    
36. getLooper().quit(); 
    
37. ...mVibrator.cancel(); 
    
38. 
    

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        第六部分：通话相关的notification服务 
        6、通话相关的notification服务。 
        6.1、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 

java代码：

1. sMe = new NotificationMgr(context); 
   
2. mNotificationMgr = (NotificationManager) 
   
3. context.getSystemService(Context.NOTIFICATION_SERVICE); 
   
4. mStatusBar = (StatusBarManager) context.getSystemService(Context.STATUS_BAR_SERVICE); //主要用于显示静音和

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        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） 

         6.2、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。