ServiceStateTracker與RIL對象的交互

ServiceStateTracker與RIL對象的交互

兩種方式：

• ServiceStateTracker對象主動發起的
• ServiceStateTracker對象被動接收的

1.被動接收RIL上報

• ServiceStateTracker對象和Phone對象有相同的生命週期，在建立時會調用RIL對象的registerForXXX和setOnXXX方法，完成7種類型註冊：

        //ServiceStateTracker
        mCi.setOnSignalStrengthUpdate(this, EVENT_SIGNAL_STRENGTH_UPDATE, null);
        mCi.registerForCellInfoList(this, EVENT_UNSOL_CELL_INFO_LIST, null);

        //GsmServiceStateTracker       
        mCi.registerForAvailable(this, EVENT_RADIO_AVAILABLE, null);
        mCi.registerForRadioStateChanged(this, EVENT_RADIO_STATE_CHANGED, null);
        mCi.registerForVoiceNetworkStateChanged(this, EVENT_NETWORK_STATE_CHANGED, null);
        mCi.setOnNITZTime(this, EVENT_NITZ_TIME, null);
        mCi.setOnRestrictedStateChanged(this, EVENT_RESTRICTED_STATE_CHANGED, null);
        mIccRecords.registerForRecordsLoaded(this, EVENT_SIM_RECORDS_LOADED, null);
        mUiccApplcation.registerForReady(this, EVENT_SIM_READY, null);

• 註冊網絡成功後RIL會發出EVENT_SIM_READY消息，ServiceStateTracker的handleMessage接收，接着調用 pollState方法：

            case EVENT_SIM_READY:
                // Set the network type, in case the radio does not restore it.
                // mCi.setCurrentPreferredNetworkType();

                boolean skipRestoringSelection = mPhone.getContext().getResources().getBoolean(
                        com.android.internal.R.bool.skip_restoring_network_selection);

                if (!skipRestoringSelection) {
                    // restore the previous network selection.
                    mPhone.restoreSavedNetworkSelection(null);
                }
                pollState();
                // Signal strength polling stops when radio is off
                queueNextSignalStrengthPoll();
                break;

• pollState方法首先判斷radio是否可用，然後會連續向RIL發出4個請求：

<pre name="code" class="java">                mPollingContext[0]++;

mCi.getOperator( obtainMessage( EVENT_POLL_STATE_OPERATOR, mPollingContext)); mPollingContext[0]++; mCi.getDataRegistrationState( obtainMessage( EVENT_POLL_STATE_GPRS, mPollingContext)); mPollingContext[0]++; mCi.getVoiceRegistrationState( obtainMessage( EVENT_POLL_STATE_REGISTRATION, mPollingContext)); mPollingContext[0]++; mCi.getNetworkSelectionMode( obtainMessage( EVENT_POLL_STATE_NETWORK_SELECTION_MODE, mPollingContext));

• 會向MODEM發出對應的AT指令，handleMessage接受返回的結果，然後都會調用handlePollStateResult方法：

            case EVENT_POLL_STATE_REGISTRATION:
            case EVENT_POLL_STATE_GPRS:
            case EVENT_POLL_STATE_OPERATOR:
            case EVENT_POLL_STATE_NETWORK_SELECTION_MODE:
                ar = (AsyncResult) msg.obj;

                handlePollStateResult(msg.what, ar);
                break;

• 在handlePollStateResult方法中會具體處理4種消息，主要是更新mNewSS(ServiceState)對象和mNewXXX對象的一些屬性，最終調用pollStateDone方法，跟新屬性，如果網絡基本信息或狀態改變了，發起對應的handler消息。

2.向服務對象主動發起服務狀態控制請求：

主要通過setRadioPower方法，打開關閉radio無線通信模塊。

    @Override
    protected void setPowerStateToDesired() {

        if (mAlarmSwitch) {
            if(DBG) log("mAlarmSwitch == true");
            Context context = mPhone.getContext();
            AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
            am.cancel(mRadioOffIntent);
            mAlarmSwitch = false;
        }

        // If we want it on and it's off, turn it on
        if (mDesiredPowerState
                && mCi.getRadioState() == CommandsInterface.RadioState.RADIO_OFF) {
            mCi.setRadioPower(true, null);
        } else if (!mDesiredPowerState && mCi.getRadioState().isOn()) {
            // If it's on and available and we want it off gracefully
            if (mPowerOffDelayNeed) {
                if (mImsRegistrationOnOff && !mAlarmSwitch) {
                    if(DBG) log("mImsRegistrationOnOff == true");
                    Context context = mPhone.getContext();
                    AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);

                    Intent intent = new Intent(ACTION_RADIO_OFF);
                    mRadioOffIntent = PendingIntent.getBroadcast(context, 0, intent, 0);

                    mAlarmSwitch = true;
                    if (DBG) log("Alarm setting");
                    am.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,
                            SystemClock.elapsedRealtime() + 3000, mRadioOffIntent);
                } else {
                    DcTrackerBase dcTracker = mPhone.mDcTracker;
                    powerOffRadioSafely(dcTracker);
                }
            } else {
                DcTrackerBase dcTracker = mPhone.mDcTracker;
                powerOffRadioSafely(dcTracker);
            }
        } else if (mDeviceShuttingDown && mCi.getRadioState().isAvailable()) {
            mCi.requestShutdown(null);
        }
    }