GSMPhone与CDMAPhone切换过程
Phone创建过程
Phone APP开机启动，会去创建Phone：
public static void makeDefaultPhone(Context context) { // Get preferred network mode 根据网络设置， // 否则默认PREFERRED_NETWORK_MODE 为= NETWORK_MODE_WCDMA_PREF; int preferredNetworkMode = RILConstants.PREFERRED_NETWORK_MODE; if (BaseCommands.getLteOnCdmaModeStatic() == Phone.LTE_ON_CDMA_TRUE) { preferredNetworkMode = Phone.NT_MODE_GLOBAL; } //从数据库中查询设置preferred network mode int networkMode = Settings.Secure.getInt(context.getContentResolver(), Settings.Secure.PREFERRED_NETWORK_MODE, preferredNetworkMode); //创建RIL，将会设置Modem的preferred network mode sCommandsInterface = new RIL(context, networkMode, cdmaSubscription); //若没有设置preferred network mode 或者设置pref WCDMA 则create GSMPhone int phoneType = getPhoneType(networkMode); if (phoneType == Phone.PHONE_TYPE_GSM) { //create GSMPhone sProxyPhone = new PhoneProxy(new GSMPhone(context, sCommandsInterface, sPhoneNotifier)); } else if (phoneType == Phone.PHONE_TYPE_CDMA) { //create CDMAPhone Or CDMALTEPhone } …… }
Phone是在开机就启动的，创建具体Phone是GSMPhone还是CDMAPhone，
这个创建过程，跟插入的卡类型无关，跟设置preferred network mode有关；
但是在具体使用中，假如插入UIM卡，显然是不行，肯定存在着GSMPhone向CDMAPhone切换的过程；或者相反的切换过程，看看此过程是如何进行的。
PhoneProxy状态处理
创建的Phone使用PhoneProxy代理的，PhoneProxy是个handler，实现Phone接口
PhoneProxy构造过程
public PhoneProxy(PhoneBase phone) { mActivePhone = phone; mCommandsInterface = ((PhoneBase)mActivePhone).mCM; //监听modem传递过来的一些消息 mCommandsInterface.registerForRilConnected(this, EVENT_RIL_CONNECTED, null); mCommandsInterface.registerForOn(this, EVENT_RADIO_ON, null); mCommandsInterface.registerForVoiceRadioTechChanged( this, EVENT_VOICE_RADIO_TECH_CHANGED, null); …… }
PhoneProxy里面监听了modem传递过来的一些，看看这些消息都具体干了些什么。
public void handleMessage(Message msg) { AsyncResult ar = (AsyncResult) msg.obj; logd(" msg.what = " + msg.what); switch(msg.what) { case EVENT_RADIO_ON: mVoiceTechQueryContext++; mCommandsInterface.getVoiceRadioTechnology( obtainMessage(EVENT_REQUEST_VOICE_RADIO_TECH_DONE, mVoiceTechQueryContext)); break; case EVENT_VOICE_RADIO_TECH_CHANGED: mVoiceTechQueryContext++; mCommandsInterface.getVoiceRadioTechnology( obtainMessage(EVENT_REQUEST_VOICE_RADIO_TECH_DONE, mVoiceTechQueryContext)); break; case EVENT_REQUEST_VOICE_RADIO_TECH_DONE: updatePhoneObject(newVoiceTech); break; …… } }
注册了EVENT_RADIO_ON与EVENT_VOICE_RADIO_TECH_CHANGED
当收到这两个消息的时候，都调用了RIL的getVoiceRadioTechnology，获取当前注册网络使用技术；
具体是哪一个消息新创建Phone，通过Log看到是Modem传递过来的EVENT_VOICE_RADIO_TECH_CHANGED消息；
完了之后会将消息EVENT_REQUEST_VOICE_RADIO_TECH_DONE传递给PhoneProxy，
调用updatePhoneObject，更新Phone.
GSM 与CDMA切换过程
public void updatePhoneObject(int newVoiceRadioTech) { //一堆判断是否当前Phone与当前网络技术相匹配 //当前创建的Phone与网络技术不匹配，重新创建Phone deleteAndCreatePhone(newVoiceRadioTech); } private void deleteAndCreatePhone(int newVoiceRadioTech) { String outgoingPhoneName = "Unknown"; Phone oldPhone = mActivePhone; //打印从GSM——》CDMA Or CDMA——》GSM outgoingPhoneName = ((PhoneBase) oldPhone).getPhoneName(); logd("Switching Voice Phone : " + outgoingPhoneName + " >>> " + (ServiceState.isGsm(newVoiceRadioTech) ? "GSM" : "CDMA")); //oldPhone Unregister oldPhone.dispose(); //创建新Phone createNewPhone(newVoiceRadioTech); } protected void createNewPhone(int newVoiceRadioTech) { if (ServiceState.isCdma(newVoiceRadioTech)) { mActivePhone = PhoneFactory.getCdmaPhone(); } else if (ServiceState.isGsm(newVoiceRadioTech)) { mActivePhone = PhoneFactory.getGsmPhone(); } }
通过当前设置Modem的preferred network mode与当前注册网络技术，进行比较，不匹配通知上层，进行查询更新。