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。