Query regarding TelephonyManager Methods

[Anees]

Hello experts,

For the past few days, I have been trying to figure out as to how
different methods inside TelephonyManager class fetch the data.

I referred the method getNetworkOperator() implementation in
TelephonyManager whichis as follows.

public String getNetworkOperator() {
return
SystemProperties.get(TelephonyProperties.PROPERTY_OPERATOR_NUMERIC);
}


"SystemProperties.get(....)" from TelephonyManager leads me to the
following implementation inside SystemProperties

public static String get(String key) {
if (key.length() > PROP_NAME_MAX) {
throw new IllegalArgumentException("key.length > " +
PROP_NAME_MAX);
}
return native_get(key);
}



"native_get(key)" has following declaration:

native_get(key)

Further down native_get(key) in the android open source code, I am not
able to check and it is not exposed I presume.


I would be obliged, if anyone could kindly let me know further down,
how this data is fetched from the SIM and which classes/method I
should refer, so that, I can clearly see, from where and how, the
NetworkOperator details are fetched.

I have been referring the code for days and still I could not find out
how the network operator detail is being fetched in android AOSP.

Any help in this regard would be well appreciated.

Best Regards,
Anees

[Hungry Squid]

Hi,

The TelephonyProperties.PROPERTY_OPERATOR_NUMERIC is stored as a system property, as suggested.

If you do a reference search on it, you will find in GsmServiceStateTracker.java, in pollStateDone() method, that there is this line

       phone.setSystemProperty(TelephonyProperties.PROPERTY_OPERATOR_NUMERIC, operatorNumeric);

Similarly for CDMA.

Good luck

[Anees]

Hi Rokeyge,

Thanks for your reply, but unfortunately, it does not clarify my
doubt.

To be more specific, I need to know the very root functionality/method/
class which fetches the different attributes associated with a SIM
card.

For eg;

getDeviceId() - Returns the unique device ID, for example, the IMEI
for GSM
getNetworkOperator() - Returns the numeric name (MCC+MNC) of current
registered operator.

Where does these data reside and which are the classes/methods in AOSP
that fetches these data from the location in which it resides. I
searched a lot inside the AOSP, but all my efforts were in vain.

Any help is much appreciated.

Regards,
Anees

[Anees]

Hi Rokeyge,

Thanks for your help. But unfortunately, it does not clarify my query.

To make things more clear, I need to know, the classes/methods which
fetches the various attributes which are related to a SIM.

For eg;
getDeviceId() - Returns the unique device ID, for example, the IMEI

for GSM.

getNetworkOperator() - Returns the numeric name (MCC+MNC) of current
registered operator.

I am quite sure these are the attributes which will vary on a case to
case basis and there would be some specific methods/classes which
would fetch these information from where it is stored.

I searched a lot in the AOSP to find the classes/methods which does
this, but my efforts were in vain.

Any help in this regard is much appreciated.

Kind Regards,
Anees