[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

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