[Android]RIL的启动流程

 

 

RIL模块加载后，会主动上报：

[UNSL]< UNSOL_RESPONSE_RADIO_STATE_CHANGED  {RADIO_OFF}

Ril.java收到这个主动上报后会调用setRadioStateFromRILInt, setRadioStateFromRILInt 将通过setRadioState上报给GsmServiceStateTracker 。

GsmServiceStateTracker 在初始化时注册EVENT_RADIO_STATE_CHANGED用来监听Radio的状态变化。收到EVENT_RADIO_STATE_CHANGED后，调用setPowerStateToDesired再通知RIJD是否打开radio。setPowerStateToDesired中通过mDesiredPowerState 判定是否打开radio。mDesiredPowerState 的值将在GsmServiceStateTracker 初始化时获取。

可以在GsmServiceStateTracker 获取mDesiredPowerState 之前就把当前的模式设置为飞行模式。

 

下面是这个流程的相关函数。

 

RIL.java

private void setRadioStateFromRILInt(int state) {

        RadioState newState;

        setRadioState(newState);

      }

 

GsmServiceStateTracker

cm.registerForRadioStateChanged(this, EVENT_RADIO_STATE_CHANGED, null);

            case EVENT_RADIO_STATE_CHANGED:

                // This will do nothing in the radio not

                // available case

                Log.d("GSM","handleMessage:EVENT_RADIO_STATE_CHANGED");

                setPowerStateToDesired();

                pollState();

 

     int airplaneMode = Settings.System.getInt(

                phone.getContext().getContentResolver(),

                Settings.System.AIRPLANE_MODE_ON, 0);

        mDesiredPowerState = ! (airplaneMode > 0);//获取是否为飞行模式

          

    protected void setPowerStateToDesired() {

           if (mDesiredPowerState

            && cm.getRadioState() == CommandsInterface.RadioState.RADIO_OFF) {

            Log.d(LOG_TAG,"power on radio");

            cm.setRadioPower(true, null);//通知RILD是否开radio

        }     

    }

        

 

BaseCommands

    public void registerForRadioStateChanged(Handler h, int what, Object obj) {

        Registrant r = new Registrant (h, what, obj);

        synchronized (mStateMonitor) {

            mRadioStateChangedRegistrants.add(r);

            r.notifyRegistrant();

        }

    }

 

    protected void setRadioState(RadioState newState) {

        RadioState oldState;

        synchronized (mStateMonitor) {

            if (Config.LOGV) {

                Log.v(LOG_TAG, "setRadioState old: " + mState

                    + " new " + newState);

            }

            oldState = mState;

            mState = newState;

            if (oldState == mState) {

                // no state transition

                return;

            }

            mRadioStateChangedRegistrants.notifyRegistrants();//通知GsmServiceStateTracker