Telephony状态维护—ServiceStateTracker

一 ServiceStateTracker

　　作为Phone重要的Tracker：CallTracker，DataConnectionTracker，ServiceStateTracker

ServiceStateTracker：处理和维护手机各种状态

                   小区位置CellLocation，网络状态ServiceState，信号强度SignalStrength，

                   业务限制状态RestrictedState，用户识别卡信息IccRecords……

看一下ServiceStateTracker类结构图：

　　　　        

对于CDMA和GSM两种网络通信技术，存在着一些差异，下面看看CDMAServiceStateTracker工作流程。

         CDMAServiceStateTracker是一个Handler，用来处理很多Message，从其处理的Message上就可以了解CDMAServiceStateTracker流程和作用。

 

二 CDMAServiceStateTracker构造

1 CDMAServiceStateTracker构造

public CdmaServiceStateTracker(CDMAPhone phone) { //相关对象初始化
        this.phone = phone; ss = new ServiceState(); newSS = new ServiceState(); cellLoc = new CdmaCellLocation(); mSignalStrength = new SignalStrength(); //CDMA Subscription Source 管理 机卡分离 Or 机卡一体
        mCdmaSSM = CdmaSubscriptionSourceManager.getInstance(phone.getContext(), cm, this, EVENT_CDMA_SUBSCRIPTION_SOURCE_CHANGED, null); //向RIL注册相关的事件 //注册Radio 状态变化监听事件
        cm.registerForRadioStateChanged(this, EVENT_RADIO_STATE_CHANGED, null);
 //语音业务状态变化
        cm.registerForVoiceNetworkStateChanged(this, EVENT_NETWORK_STATE_CHANGED_CDMA, null);
 //时间更新
        cm.setOnNITZTime(this, EVENT_NITZ_TIME, null);
 //信号强度更新
        cm.setOnSignalStrengthUpdate(this, EVENT_SIGNAL_STRENGTH_UPDATE, null);
 //漫游列表相关
        cm.registerForCdmaPrlChanged(this, EVENT_CDMA_PRL_VERSION_CHANGED, null);
 //OTA相关
        cm.registerForCdmaOtaProvision(this,EVENT_OTA_PROVISION_STATUS_CHANGE, null);
 //获取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 事件处理

RIL接收到此类事件就会notify到注册的Handler中处理；

                   

public void handleMessage (Message msg) { switch (msg.what) { …… case EVENT_RUIM_READY: //解析漫游相关的ERI数据
 phone.prepareEri(); break; case EVENT_NV_READY: //机卡一体subscription information存储在手机上NV中
 getSubscriptionInfoAndStartPollingThreads(); break; case EVENT_RADIO_STATE_CHANGED: //Radio打开状态 获取信号强度
                if(cm.getRadioState() == RadioState.RADIO_ON) { handleCdmaSubscriptionSource(mCdmaSSM.getCdmaSubscriptionSource()); // Signal strength polling stops when radio is off.
 queueNextSignalStrengthPoll(); } //start Radio
 setPowerStateToDesired(); //网络状态变化更新
 pollState(); break; case EVENT_NETWORK_STATE_CHANGED_CDMA: //网络状态变化更新
 pollState(); break; case EVENT_GET_SIGNAL_STRENGTH: //获取射频信号强度
                onSignalStrengthResult(ar, phone, false); queueNextSignalStrengthPoll(); break; case EVENT_POLL_SIGNAL_STRENGTH: cm.getSignalStrength(obtainMessage(EVENT_GET_SIGNAL_STRENGTH)); break; case EVENT_NITZ_TIME: //更新时间
 setTimeFromNITZString(nitzString, nitzReceiveTime); break; case EVENT_SIGNAL_STRENGTH_UPDATE: //更新信号强度
                onSignalStrengthResult(ar, phone, false); break; case EVENT_RUIM_RECORDS_LOADED: //更新手机Spn显示
 updateSpnDisplay(); break; …… } }

 

3 事件处理流程

                   开机构造Phone时，创建CdmaServiceStateTracker对象并注册监听事件.

开机几个事件处理：

  　　　　　　　　

　　rild进程中建立RIL CPP与QCRIL的连接之后，要保证建立Framework层RIL与Native RIL socket连接

当建立socket连接之后，RIL_CPP会想 RIL_JAVA发送RIL_UNSOL_RIL_CONNECTED消息，告诉RIL_JAVA已经建立连接;

　　否则RIL_JAVA不断尝试建立连接，RIL_CPP会继续监听连接.

根据这个序列图过程：

　　1)  RIL_CPP向RIL_JAVA发送建立连接消息RIL_UNSOL_RIL_CONNECTED

　　2) RIL_JAVA收到建立连接的RIL_UNSOL_RIL_CONNECTED后，向RILD发送RIL_REQUEST_RADIO_POWER消息，将RADIO置为 OFF状态

　　3)  MODEM发送RADIO状态改变的事件，RIL_JAVA收到后，切换状态并通知RADIO状态变化

　　4)  CdmaServiceStateTracker接收到EVENT_RADIO_STATE_CHANGED通知，会启动RADIO设置为On状态

　　5)  RIL_JAVA会向RILD发送RIL_REQUEST_RADIO_POWER消息，去启动RADIO

　　6)  RADIO状态变化，发送EVENT_RADIO_STATE_CHANGED通知，CdmaServiceStateTracker更新状态，获取信号强度……

 

4  状态设置

         在代码里看到状态的变化处理都是在pollState中处理的

 

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

 

最终状态的都是通过调用函数pollStateDone完成：

　　protected void pollStateDone() { //维护两个ServiceState状态，判断状态的变化状况
        if (DBG) log("pollStateDone: oldSS=[" + ss + "] newSS=[" + newSS + "]"); //移动网络状况
        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; //数据网络状况
        boolean hasCdmaDataConnectionAttached = mDataConnectionState != ServiceState.STATE_IN_SERVICE && mNewDataConnectionState == ServiceState.STATE_IN_SERVICE; boolean hasCdmaDataConnectionDetached = mDataConnectionState == ServiceState.STATE_IN_SERVICE && mNewDataConnectionState != ServiceState.STATE_IN_SERVICE; //各种数据连接状态变化判断
        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); //更新状态
 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 //网络注册状态通知
        if (hasRegistered) { mNetworkAttachedRegistrants.notifyRegistrants(); } //数据连接通知
        if (hasCdmaDataConnectionAttached) { mAttachedRegistrants.notifyRegistrants(); } //数据断开通知
        if (hasCdmaDataConnectionDetached) { mDetachedRegistrants.notifyRegistrants(); } //开启漫游通知
        if (hasRoamingOn) { mRoamingOnRegistrants.notifyRegistrants(); } …… }