Configure APNs on Android 9 (API level 28)

I'm trying to use the new APN api

The code looks like this

DevicePolicyManager dpm = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);

ComponentName deviceAdmin = new ComponentName(getApplicationContext(), DeviceAdmin.class);

ApnSetting apn = (new ApnSetting.Builder())
        .setApnTypeBitmask(ApnSetting.TYPE_DEFAULT)
        .setApnName("sonme.real.apn.url")
        .setEntryName("Some Entry")
        .setCarrierEnabled(true)
        .build();

int re = dpm.addOverrideApn(deviceAdmin, apn);

dpm.setOverrideApnsEnabled(deviceAdmin, true);

But except the fact that the APN menu becomes unavailable (locked to admin - which is OK) the APN is not working

p.s

I checked with dpm.getOverrideApns(deviceAdmin); and the added apn is present... And I also tried setting the setProtocol and setRoamingProtocol

Any Ideas?

Finally figured out what was missing

It appears that when adding apns using the API you must explicitly specify the setProtocol, setRoamingProtocol and the setOperatorNumeric,its a must and its consists from Telephony.Carriers.MCC + Telephony.Carriers.MNC (in my case, I had to pad the MNC with a leading zero)

ApnSetting apn = (new ApnSetting.Builder())
        .setApnTypeBitmask(ApnSetting.TYPE_DEFAULT)
        .setApnName("net.hotm")
        .setEntryName("HOT")
        .setCarrierEnabled(true) // enable it
        .setOperatorNumeric("425" + "07") // this is a must its consists from Telephony.Carriers.MCC + Telephony.Carriers.MNC, In my case, I had to pad the MNC with a leading zero
        .setProtocol(ApnSetting.PROTOCOL_IPV4V6) // this is a must
        .setRoamingProtocol(ApnSetting.PROTOCOL_IPV4V6) // this is a must
        .build();

int re = dpm.addOverrideApn(deviceAdmin, apn);

currApns =  dpm.getOverrideApns(deviceAdmin);

dpm.setOverrideApnsEnabled(deviceAdmin, true);

p.s

MCC and MNC could be fetched from TelephonyManager, getSimOperator() (getSimOperator().substring(3) and getSimOperator().substring(0, 3))