Telephony狀態維護—ServiceStateTracker

一 ServiceStateTracker

　　作為Phone重要的Tracker：CallTracker，DataConnectionTracker，ServiceStateTracker

ServiceStateTracker：處理和維護手機各種狀態

                   小區位置CellLocation，網路狀態ServiceState，訊號強度SignalStrength，

                   業務限制狀態RestrictedState，使用者識別卡資訊IccRecords……

看一下ServiceStateTracker類結構圖：

　　　　        

對於CDMA和GSM兩種網路通訊技術，存在著一些差異，下面看看CDMAServiceStateTracker工作流程。

         CDMAServiceStateTracker是一個Handler，用來處理很多Message，從其處理的Message上就可以瞭解CDMAServiceStateTracker流程和作用。

 

二 CDMAServiceStateTracker構造1 CDMAServiceStateTracker構造

public CdmaServiceStateTracker(CDMAPhone phone) {        //相關對象初始化        this.phone = phone;        ss = new ServiceState();        newSS = new ServiceState();        cellLoc = new CdmaCellLocation();        mSignalStrength = new SignalStrength();                //CDMA Subscription Source 管理 機卡分離 Or 機卡一體        mCdmaSSM = CdmaSubscriptionSourceManager.getInstance(phone.getContext(), cm, this,                EVENT_CDMA_SUBSCRIPTION_SOURCE_CHANGED, null);        //向RIL註冊相關的事件        //註冊Radio 狀態變化監聽事件        cm.registerForRadioStateChanged(this, EVENT_RADIO_STATE_CHANGED, null);
//語音業務狀態變化        cm.registerForVoiceNetworkStateChanged(this, EVENT_NETWORK_STATE_CHANGED_CDMA, null);
//時間更新        cm.setOnNITZTime(this, EVENT_NITZ_TIME, null);
//訊號強度更新        cm.setOnSignalStrengthUpdate(this, EVENT_SIGNAL_STRENGTH_UPDATE, null);
//漫遊列表相關        cm.registerForCdmaPrlChanged(this, EVENT_CDMA_PRL_VERSION_CHANGED, null);
//OTA相關        cm.registerForCdmaOtaProvision(this,EVENT_OTA_PROVISION_STATUS_CHANGE, null);
//擷取CDMA制式        cm.getCDMASubscription(obtainMessage(EVENT_POLL_STATE_CDMA_SUBSCRIPTION));        // System setting property AIRPLANE_MODE_ON is set in Settings.        int airplaneMode = Settings.System.getInt(cr, Settings.System.AIRPLANE_MODE_ON, 0);        mDesiredPowerState = ! (airplaneMode > 0);}

 

2 事件處理

RIL接收到此類事件就會notify到註冊的Handler中處理；

                   

public void handleMessage (Message msg) {        switch (msg.what) {                ……            case EVENT_RUIM_READY:                //解析漫遊相關的ERI資料                phone.prepareEri();                break;            case EVENT_NV_READY:                //機卡一體subscription information儲存在手機上NV中                getSubscriptionInfoAndStartPollingThreads();                break;            case EVENT_RADIO_STATE_CHANGED:                //Radio開啟狀態 擷取訊號強度                if(cm.getRadioState() == RadioState.RADIO_ON) {                    handleCdmaSubscriptionSource(mCdmaSSM.getCdmaSubscriptionSource());                    // Signal strength polling stops when radio is off.                    queueNextSignalStrengthPoll();                }                //start Radio                setPowerStateToDesired();                //網路狀態變化更新                pollState();                break;            case EVENT_NETWORK_STATE_CHANGED_CDMA:                //網路狀態變化更新                pollState();                break;            case EVENT_GET_SIGNAL_STRENGTH:                //擷取射頻訊號強度                onSignalStrengthResult(ar, phone, false);                queueNextSignalStrengthPoll();                break;            case EVENT_POLL_SIGNAL_STRENGTH:                cm.getSignalStrength(obtainMessage(EVENT_GET_SIGNAL_STRENGTH));                break;            case EVENT_NITZ_TIME:                //更新時間                setTimeFromNITZString(nitzString, nitzReceiveTime);                break;            case EVENT_SIGNAL_STRENGTH_UPDATE:                //更新訊號強度                onSignalStrengthResult(ar, phone, false);                break;            case EVENT_RUIM_RECORDS_LOADED:                //更新手機Spn顯示                updateSpnDisplay();                break;            ……        }    }

 3 事件處理流程

                   開機構造Phone時，建立CdmaServiceStateTracker對象並註冊監聽事件.

開機幾個事件處理：

  　　　　　　　　

　　rild進程中建立RIL CPP與QCRIL的串連之後，要保證建立Framework層RIL與Native RIL socket串連

當建立socket串連之後，RIL_CPP會想 RIL_JAVA發送RIL_UNSOL_RIL_CONNECTED訊息，告訴RIL_JAVA已經建立串連;

　　否則RIL_JAVA不斷嘗試建立串連，RIL_CPP會繼續監聽串連.

根據這個順序圖表過程：

　　1)  RIL_CPP向RIL_JAVA發送建立串連訊息RIL_UNSOL_RIL_CONNECTED

　　2) RIL_JAVA收到建立串連的RIL_UNSOL_RIL_CONNECTED後，向RILD發送RIL_REQUEST_RADIO_POWER訊息，將RADIO置為 OFF狀態

　　3)  MODEM發送RADIO狀態改變的事件，RIL_JAVA收到後，切換狀態並通知RADIO狀態變化

　　4)  CdmaServiceStateTracker接收到EVENT_RADIO_STATE_CHANGED通知，會啟動RADIO設定為On狀態

　　5)  RIL_JAVA會向RILD發送RIL_REQUEST_RADIO_POWER訊息，去啟動RADIO

　　6)  RADIO狀態變化，發送EVENT_RADIO_STATE_CHANGED通知，CdmaServiceStateTracker更新狀態，擷取訊號強度……

 

4  狀態設定

         在代碼裡看到狀態的變化處理都是在pollState中處理的

 

　　case EVENT_RADIO_STATE_CHANGED:            setPowerStateToDesired();            pollState();            break;   case EVENT_NETWORK_STATE_CHANGED_CDMA:            pollState();            break;

 

最終狀態的都是通過調用函數pollStateDone完成：

　　protected void pollStateDone() {            //維護兩個ServiceState狀態，判斷狀態的變化狀況        if (DBG) log("pollStateDone: oldSS=[" + ss + "] newSS=[" + newSS + "]");                   //移動網路狀況        boolean hasRegistered =            ss.getState() != ServiceState.STATE_IN_SERVICE            && newSS.getState() == ServiceState.STATE_IN_SERVICE;        boolean hasDeregistered =            ss.getState() == ServiceState.STATE_IN_SERVICE            && newSS.getState() != ServiceState.STATE_IN_SERVICE;                   //資料網路狀況        boolean hasCdmaDataConnectionAttached =            mDataConnectionState != ServiceState.STATE_IN_SERVICE            && mNewDataConnectionState == ServiceState.STATE_IN_SERVICE;        boolean hasCdmaDataConnectionDetached =            mDataConnectionState == ServiceState.STATE_IN_SERVICE            && mNewDataConnectionState != ServiceState.STATE_IN_SERVICE;                   //各種資料連線狀態變化判斷        boolean hasCdmaDataConnectionChanged =                       mDataConnectionState != mNewDataConnectionState;        boolean hasRadioTechnologyChanged = mRilRadioTechnology != mNewRilRadioTechnology;        boolean hasChanged = !newSS.equals(ss);        boolean hasRoamingOn = !ss.getRoaming() && newSS.getRoaming();        boolean hasRoamingOff = ss.getRoaming() && !newSS.getRoaming();        boolean hasLocationChanged = !newCellLoc.equals(cellLoc);                    //更新狀態        ServiceState tss;        tss = ss;        ss = newSS;        newSS = tss;        // clean slate for next time        newSS.setStateOutOfService();        CdmaCellLocation tcl = cellLoc;        cellLoc = newCellLoc;        newCellLoc = tcl;        mDataConnectionState = mNewDataConnectionState;        mRilRadioTechnology = mNewRilRadioTechnology;        // this new state has been applied - forget it until we get a new new state        mNewRilRadioTechnology = 0;        newSS.setStateOutOfService(); // clean slate for next time                            //網路註冊狀態通知        if (hasRegistered) {            mNetworkAttachedRegistrants.notifyRegistrants();        }        //資料連線通知        if (hasCdmaDataConnectionAttached) {            mAttachedRegistrants.notifyRegistrants();        }            //資料斷開通知        if (hasCdmaDataConnectionDetached) {            mDetachedRegistrants.notifyRegistrants();        }            //開啟漫遊通知        if (hasRoamingOn) {            mRoamingOnRegistrants.notifyRegistrants();        }                    ……    }