我們先看下7.0來電大體流程：

Framework

modem接收到來電通知消息后，以AT指令的方式上報RIL層，RIL層通過sokcet將消息發送給RILJ， 上報事件ID: RIL_UNSOL_RESPONSE_CALL_STATE_CHANGED：

• frameworks/opt/telephony – RIL

　private void　processUnsolicited (Parcel p, int type) {case RIL_UNSOL_RESPONSE_CALL_STATE_CHANGED:if (RILJ_LOGD) unsljLog(response);mCallStateRegistrants.notifyRegistrants(new AsyncResult(null, null, null));break;

• frameworks/opt/telephony – BaseCommands
  mCallStateRegistrants在BaseCommands中添加的觀察者方法，在GsmCdmaCallTracker中注冊了registerForCallStateChanged方法：

@Overridepublic void registerForCallStateChanged(Handler h, int what, Object obj) {Registrant r = new Registrant (h, what, obj);mCallStateRegistrants.add(r);}

• frameworks/opt/telephony – GsmCdmaCallTracker

　public GsmCdmaCallTracker (GsmCdmaPhone phone) {mCi = phone.mCi;mCi.registerForCallStateChanged(this, EVENT_CALL_STATE_CHANGE, null);

接著找到EVENT_CALL_STATE_CHANGE消息：

case EVENT_CALL_STATE_CHANGE:pollCallsWhenSafe();break;

• frameworks/opt/telephony – CallTracker
  找到GsmCdmaCallTracker父類的方法pollCallsWhenSafe：

protected void pollCallsWhenSafe() {mNeedsPoll = true;if (checkNoOperationsPending()) {mLastRelevantPoll = obtainMessage(EVENT_POLL_CALLS_RESULT);mCi.getCurrentCalls(mLastRelevantPoll);}}

• frameworks/opt/telephony – RIL
  找到CommandsInterface mCi，而其RIL implements CommandsInterface實現了getCurrentCalls方法，，攜帶消息
  EVENT_POLL_CALLS_RESULT：

@Overridepublic void getCurrentCalls (Message result) {RILRequest rr = RILRequest.obtain(RIL_REQUEST_GET_CURRENT_CALLS, result);if (RILJ_LOGD) riljLog(rr.serialString() + "> " + requestToString(rr.mRequest));send(rr);}

• frameworks/opt/telephony – GsmCdmaCallTracker
  和之前流程類似，接著進入handlePollCalls方法：

case EVENT_POLL_CALLS_RESULT:Rlog.d(LOG_TAG, "Event EVENT_POLL_CALLS_RESULT Received");if (msg == mLastRelevantPoll) {if (DBG_POLL) log("handle EVENT_POLL_CALL_RESULT: set needsPoll=F");mNeedsPoll = false;mLastRelevantPoll = null;handlePollCalls((AsyncResult)msg.obj);}

更新狀態，發送call state change通知等：

　 if (newRinging != null) {mPhone.notifyNewRingingConnection(newRinging);}updatePhoneState();if (hasNonHangupStateChanged || newRinging != null || hasAnyCallDisconnected) {mPhone.notifyPreciseCallStateChanged();}

• frameworks/opt/telephony –　Phone
  notifyNewRingingConnectionP方法：

/*** Notify registrants of a new ringing Connection.* Subclasses of Phone probably want to replace this with a* version scoped to their packages*/public void notifyNewRingingConnectionP(Connection cn) {if (!mIsVoiceCapable)return;AsyncResult ar = new AsyncResult(null, cn, null);mNewRingingConnectionRegistrants.notifyRegistrants(ar);}

Telephony

• packages/service/Telephony – PstnIncomingCallNotifier
  找到注冊registerForNewRingingConnection處,
  消息EVENT_NEW_RINGING_CONNECTION調用handleNewRingingConnection：

mPhone.registerForNewRingingConnection(mHandler, EVENT_NEW_RINGING_CONNECTION, null);case EVENT_NEW_RINGING_CONNECTION:handleNewRingingConnection((AsyncResult) msg.obj);break;

Framework

• frameworks/base/telecomm – TelecomManager
  addNewIncomingCall方法

public void addNewIncomingCall(PhoneAccountHandle phoneAccount, Bundle extras) {try {if (isServiceConnected()) {getTelecomService().addNewIncomingCall(phoneAccount, extras == null ? new Bundle() : extras);}} catch (RemoteException e) {Log.e(TAG, "RemoteException adding a new incoming call: " + phoneAccount, e);}}

Telecom

• packages/services/Telecom – TelecomServiceImpl
  找到對應的ITelecomServic aidl接收的地方，查看addNewIncomingCall方法：

private final ITelecomService.Stub mBinderImpl = new ITelecomService.Stub() {@Overridepublic void addNewIncomingCall(PhoneAccountHandle phoneAccountHandle, Bundle extras) {Intent intent = new Intent(TelecomManager.ACTION_INCOMING_CALL);intent.putExtra(TelecomManager.EXTRA_PHONE_ACCOUNT_HANDLE,phoneAccountHandle);intent.putExtra(CallIntentProcessor.KEY_IS_INCOMING_CALL, true);if (extras != null) {extras.setDefusable(true);intent.putExtra(TelecomManager.EXTRA_INCOMING_CALL_EXTRAS, extras);}mCallIntentProcessorAdapter.processIncomingCallIntent(mCallsManager, intent);

• packages/services/Telecom – CallIntentProcessor

static void processIncomingCallIntent(CallsManager callsManager, Intent intent) {callsManager.processIncomingCallIntent(phoneAccountHandle, clientExtras);}

• packages/services/Telecom – CallsManager
  創建call之后，CreateConnection創建鏈接，之后的流程和呼出流程類似：

void processIncomingCallIntent(PhoneAccountHandle phoneAccountHandle, Bundle extras) {Call call = new Call(getNextCallId(),mContext,this,mLock,mConnectionServiceRepository,mContactsAsyncHelper,mCallerInfoAsyncQueryFactory,handle,null /* gatewayInfo */,null /* connectionManagerPhoneAccount */,phoneAccountHandle,Call.CALL_DIRECTION_INCOMING /* callDirection */,false /* forceAttachToExistingConnection */,false /* isConference */);call.addListener(this);call.startCreateConnection(mPhoneAccountRegistrar);}

• packages/services/Telecom – Call

void startCreateConnection(PhoneAccountRegistrar phoneAccountRegistrar) {mCreateConnectionProcessor = new CreateConnectionProcessor(this, mRepository, this,phoneAccountRegistrar, mContext);mCreateConnectionProcessor.process(); }

• packages/services/Telecom – CreateConnectionProcessor

@VisibleForTesting public void process() {Log.v(this, "process");clearTimeout();mAttemptRecords = new ArrayList<>();if (mCall.getTargetPhoneAccount() != null) {mAttemptRecords.add(new CallAttemptRecord(mCall.getTargetPhoneAccount(), mCall.getTargetPhoneAccount()));}adjustAttemptsForConnectionManager();adjustAttemptsForEmergency();mAttemptRecordIterator = mAttemptRecords.iterator();attemptNextPhoneAccount(); }

• packages/services/Telecom – ConnectionServiceWrapper

mServiceInterface.createConnection(call.getConnectionManagerPhoneAccount(),callId,new ConnectionRequest(call.getTargetPhoneAccount(),call.getHandle(),extras,call.getVideoState(),callId),call.shouldAttachToExistingConnection(),call.isUnknown());

Frameworks

• frameworks/base/telecomm – ConnectionService
  呼出時是調用onCreateOutgoingConnection，此篇是呼入，需要查看onCreateIncomingConnection

Connection connection = isUnknown ? onCreateUnknownConnection(callManagerAccount, request): isIncoming ? onCreateIncomingConnection(callManagerAccount, request): onCreateOutgoingConnection(callManagerAccount, request);

Telecom

• packages/services/Telecom – Call

　public void handleCreateConnectionSuccess(switch (mCallDirection) {case CALL_DIRECTION_INCOMING:// Listeners (just CallsManager for now) will be responsible for checking whether// the call should be blocked.for (Listener l : mListeners) {l.onSuccessfulIncomingCall(this);}break;

• packages/services/Telecom – CallsManager

@Override public void onSuccessfulIncomingCall(Call incomingCall) {Log.d(this, "onSuccessfulIncomingCall");List<IncomingCallFilter.CallFilter> filters = new ArrayList<>();filters.add(new DirectToVoicemailCallFilter(mCallerInfoLookupHelper));filters.add(new AsyncBlockCheckFilter(mContext, new BlockCheckerAdapter()));filters.add(new CallScreeningServiceFilter(mContext, this, mPhoneAccountRegistrar,mDefaultDialerManagerAdapter,new ParcelableCallUtils.Converter(), mLock));new IncomingCallFilter(mContext, this, incomingCall, mLock,mTimeoutsAdapter, filters).performFiltering(); }

• packages/services/Telecom – IncomingCallFilter
  主要執行關于攔截來電的，是否是黑名單等信息，此篇不關注此處流程：

public void performFiltering() {mHandler.postDelayed(new Runnable("ICF.pFTO") { // performFiltering time-out@Overridepublic void loggedRun() {// synchronized to prevent a race on mResult and to enter into Telecom.synchronized (mTelecomLock) {if (mIsPending) {Log.i(IncomingCallFilter.this, "Call filtering has timed out.");Log.event(mCall, Log.Events.FILTERING_TIMED_OUT);mListener.onCallFilteringComplete(mCall, mResult);mIsPending = false;}}}}.prepare(), mTimeoutsAdapter.getCallScreeningTimeoutMillis(mContext.getContentResolver())); }

• packages/services/Telecom – CallsManager

@Overridepublic void onCallFilteringComplete(Call incomingCall, CallFilteringResult result) {addCall(incomingCall);} private void addCall(Call call) {for (CallsManagerListener listener : mListeners) {listener.onCallAdded(call)；}

• packages/services/Telecom – InCallController
  和呼入篇類似，附相關代碼：

@Override public void onCallAdded(Call call) {if (!isBoundToServices()) {bindToServices(call);} else {addCall(call);inCallService.addCall(parcelableCall); }

Frameworks

• frameworks/base/telecomm – InCallService
  實現aidl方法addCall，找到消息MSG_ADD_CALL:

private final class InCallServiceBinder extends IInCallService.Stub {@Overridepublic void setInCallAdapter(IInCallAdapter inCallAdapter) {mHandler.obtainMessage(MSG_SET_IN_CALL_ADAPTER, inCallAdapter).sendToTarget();} @Overridepublic void addCall(ParcelableCall call) {mHandler.obtainMessage(MSG_ADD_CALL, call).sendToTarget();} case MSG_ADD_CALL:mPhone.internalAddCall((ParcelableCall) msg.obj);break;

• frameworks/base/telecomm – Phone

final void internalAddCall(ParcelableCall parcelableCall) {Call call = new Call(this, parcelableCall.getId(), mInCallAdapter,parcelableCall.getState());mCallByTelecomCallId.put(parcelableCall.getId(), call);mCalls.add(call);checkCallTree(parcelableCall);call.internalUpdate(parcelableCall, mCallByTelecomCallId);fireCallAdded(call);} private void fireCallAdded(Call call) {for (Listener listener : mListeners) {listener.onCallAdded(this, call);} }

• frameworks/base/telecomm – InCallService

@Override public void onCallAdded(Phone phone, Call call) {InCallService.this.onCallAdded(call); }

Dialer

• packages/app/Dialer – InCallServiceImpl

@Override public void onCallAdded(Call call) {InCallPresenter.getInstance().onCallAdded(call);}

• packages/app/Dialer – InCallPresenter

public void onCallAdded(final android.telecom.Call call) {if (shouldAttemptBlocking(call)) {maybeBlockCall(call);} else {mCallList.onCallAdded(call);} } @Override public void onIncomingCall(Call call) {InCallState newState = startOrFinishUi(InCallState.INCOMING);InCallState oldState = mInCallState;for (IncomingCallListener listener : mIncomingCallListeners) {listener.onIncomingCall(oldState, mInCallState, call);} }

總結

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