首先，最大的变化是代码路径的变化：

从原来的frameworks/base/telephony 到 frameworks/opt/telephony, 这样，telephony就可以有独立的分支（branch）.

把常量放到一个类文件中

例如把GsmDataConnectionTracker.java中的常量放到DctConstants.java中。把Phone.java中的常量放到PhoneConstants.java中。

Move the following code from PhoneFactory.java to TelephonyManager.java.

public static intgetPhoneType( intnetworkMode){
switch(networkMode){
caseRILConstants.NETWORK_MODE_CDMA:
caseRILConstants.NETWORK_MODE_CDMA_NO_EVDO:
caseRILConstants.NETWORK_MODE_EVDO_NO_CDMA:
returnPhone.PHONE_TYPE_CDMA;

caseRILConstants.NETWORK_MODE_WCDMA_PREF:
caseRILConstants.NETWORK_MODE_GSM_ONLY:
caseRILConstants.NETWORK_MODE_WCDMA_ONLY:
caseRILConstants.NETWORK_MODE_GSM_UMTS:
returnPhone.PHONE_TYPE_GSM;

// UseCDMAPhonefortheglobalmodeincludingCDMA
caseRILConstants.NETWORK_MODE_GLOBAL:
caseRILConstants.NETWORK_MODE_LTE_CDMA_EVDO:
caseRILConstants.NETWORK_MODE_LTE_CMDA_EVDO_GSM_WCDMA:
returnPhone.PHONE_TYPE_CDMA;

caseRILConstants.NETWORK_MODE_LTE_ONLY:
if(BaseCommands.getLteOnCdmaModeStatic()==Phone.LTE_ON_CDMA_TRUE){
returnPhone.PHONE_TYPE_CDMA;
} else{
returnPhone.PHONE_TYPE_GSM;
}
default:
returnPhone.PHONE_TYPE_GSM;
}

Move the following code from both of CDMAPhone and GSMPhone to PhoneBase.

publicSignalStrengthgetSignalStrength(){
returnmSST.mSignalStrength;
}
voidnotifySignalStrength(){
mNotifier.notifySignalStrength( this);
}

Move the following code from CommandsInterface.java to TelephonyManager.java

public static intgetLteOnCdmaModeStatic(){
intretVal;
intcurVal;
StringproductType="";

curVal=SystemProperties.getInt(TelephonyProperties.PROPERTY_LTE_ON_CDMA_DEVICE,
Phone.LTE_ON_CDMA_UNKNOWN);
retVal=curVal;
if(retVal==Phone.LTE_ON_CDMA_UNKNOWN){
Matchermatcher=sProductTypePattern.matcher(sKernelCmdLine);
if(matcher.find()){
productType=matcher.group(1);
if(sLteOnCdmaProductType.equals(productType)){
retVal=Phone.LTE_ON_CDMA_TRUE;
} else{
retVal=Phone.LTE_ON_CDMA_FALSE;
}
} else{
retVal=Phone.LTE_ON_CDMA_FALSE;
}
}

Log.d(LOG_TAG,"getLteOnCdmaMode="+retVal+"curVal="+curVal+
"product_type='"+productType+
"'lteOnCdmaProductType='"+sLteOnCdmaProductType+"'");
returnretVal;
}

private staticStringgetProcCmdLine()
{
Stringcmdline="";
FileInputStreamis= null;
try{
is= newFileInputStream("/proc/cmdline");
byte[]buffer= new byte[2048];
intcount=is.read(buffer);
if(count>0){
cmdline= newString(buffer,0,count);
}
} catch(IOExceptione){
Log.d(LOG_TAG,"No/proc/cmdlineexception="+e);
} finally{
if(is!= null){
try{
is.close();
} catch(IOExceptione){
}
}
}
Log.d(LOG_TAG,"/proc/cmdline="+cmdline);
returncmdline;
}

从android 4.1.1 到android 4.2 telephony的变化

首先，最大的变化是代码路径的变化：

把常量放到一个类文件中

Move the following code from PhoneFactory.java to TelephonyManager.java.

Move the following code from both of CDMAPhone and GSMPhone to PhoneBase.

Move the following code from CommandsInterface.java to TelephonyManager.java

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