1. Database changes:
- Add a protocol and a roaming_protocol column to the
carriers table in the telephony provider database.
- Set the protocol and roaming_protocol fields when
creating APN objects from the database.
2. ApnSetting class changes:
- Add protocol and roamingProtocol fields to the
ApnSetting class that encapsulates APN settings within
the framework.
- Add the fields to ApnSetting.toString and support a new
syntax containing the fields in ApnSetting.fromString.
- Add a unit test for ApnSetting.
3. Telephony changes:
- Specify the APN protocol when setting up a data call,
using protocol when not roaming and roaming_protocol
when roaming.
This change depends on #86896 in the telephony provider,
which adds the new column to the database schema on
upgrades.
Bug: 3333633
Change-Id: If3d9ed4c851d0192849df0d64581db03b066e052
3c4e929cfd