[Settings Telephony] Carrier name API replacement

Replacing TelephonyManager.getNetworkOperatorName() by
Obtaining carrier name from SubscriptionInfo.getCarrierName().

TelephonyManager.getNetworkOperatorName() only be used when there's no
SubscriptionInfo can be found.

Bug: b/140443508
Test: Manual testing
  atest MobileNetworkUtilsTest
  atest OpenNetworkSelectPagePreferenceControllerTest

Change-Id: I7a86395c86d31fe2ba54c04ac16b1a0ebfc843f3

src/com/android/settings/network/MobileNetworkPreferenceController.java

@@ -37,6 +37,7 @@ import androidx.preference.PreferenceScreen;
 import com.android.settings.core.FeatureFlags;
 import com.android.settings.core.PreferenceControllerMixin;
 import com.android.settings.network.telephony.MobileNetworkActivity;
+import com.android.settings.network.telephony.MobileNetworkUtils;
 import com.android.settingslib.RestrictedLockUtilsInternal;
 import com.android.settingslib.RestrictedPreference;
 import com.android.settingslib.Utils;
@@ -162,6 +163,6 @@ public class MobileNetworkPreferenceController extends AbstractPreferenceControl
 
     @Override
     public CharSequence getSummary() {
-        return mTelephonyManager.getNetworkOperatorName();
+        return MobileNetworkUtils.getCurrentCarrierNameForDisplay(mContext);
     }
 }

src/com/android/settings/network/telephony/MobileNetworkUtils.java

@@ -535,4 +535,60 @@ public class MobileNetworkUtils {
         icons.setTintList(Utils.getColorAttr(context, android.R.attr.colorControlNormal));
         return icons;
     }
+
+    /**
+     * This method is migrated from
+     * {@link android.telephony.TelephonyManager.getNetworkOperatorName}. Which provides
+     *
+     * 1. Better support under multi-SIM environment.
+     * 2. Similar design which aligned with operator name displayed in status bar
+     */
+    public static CharSequence getCurrentCarrierNameForDisplay(Context context, int subId) {
+        SubscriptionManager sm = context.getSystemService(SubscriptionManager.class);
+        if (sm != null) {
+            SubscriptionInfo subInfo = getSubscriptionInfo(sm, subId);
+            if (subInfo != null) {
+                return subInfo.getCarrierName();
+            }
+        }
+        return getOperatorNameFromTelephonyManager(context);
+    }
+
+    public static CharSequence getCurrentCarrierNameForDisplay(Context context) {
+        SubscriptionManager sm = context.getSystemService(SubscriptionManager.class);
+        if (sm != null) {
+            int subId = sm.getDefaultSubscriptionId();
+            SubscriptionInfo subInfo = getSubscriptionInfo(sm, subId);
+            if (subInfo != null) {
+                return subInfo.getCarrierName();
+            }
+        }
+        return getOperatorNameFromTelephonyManager(context);
+    }
+
+    private static SubscriptionInfo getSubscriptionInfo(SubscriptionManager subManager,
+            int subId) {
+        List<SubscriptionInfo> subInfos = subManager.getAccessibleSubscriptionInfoList();
+        if (subInfos == null) {
+            subInfos = subManager.getActiveSubscriptionInfoList();
+        }
+        if (subInfos == null) {
+            return null;
+        }
+        for (SubscriptionInfo subInfo : subInfos) {
+            if (subInfo.getSubscriptionId() == subId) {
+                return subInfo;
+            }
+        }
+        return null;
+    }
+
+    private static String getOperatorNameFromTelephonyManager(Context context) {
+        TelephonyManager tm =
+                (TelephonyManager) context.getSystemService(TelephonyManager.class);
+        if (tm == null) {
+            return null;
+        }
+        return tm.getNetworkOperatorName();
+    }
 }

src/com/android/settings/network/telephony/NetworkSelectSettings.java

@@ -310,9 +310,8 @@ public class NetworkSelectSettings extends DashboardFragment {
      * 1. use {@code ServiceState#getNetworkRegistrationInfoList()} to get the currently
      * registered cellIdentity, wrap it into a CellInfo;
      * 2. set the signal strength level as strong;
-     * 3. use {@link TelephonyManager#getNetworkOperatorName()} to get the title of the
-     * previously connected network operator, since the CellIdentity got from step 1 only has
-     * PLMN.
+     * 3. get the title of the previously connected network operator, since the CellIdentity
+     * got from step 1 only has PLMN.
      * - If the device has no data, we will remove the connected network operators list from the
      * screen.
      */
@@ -333,7 +332,8 @@ public class NetworkSelectSettings extends DashboardFragment {
             if (cellInfo != null) {
                 NetworkOperatorPreference pref = new NetworkOperatorPreference(
                         cellInfo, getPrefContext(), mForbiddenPlmns, mShow4GForLTE);
-                pref.setTitle(mTelephonyManager.getNetworkOperatorName());
+                pref.setTitle(MobileNetworkUtils.getCurrentCarrierNameForDisplay(
+                        getPrefContext(), mSubId));
                 pref.setSummary(R.string.network_connected);
                 // Update the signal strength icon, since the default signalStrength value would be
                 // zero (it would be quite confusing why the connected network has no signal)

src/com/android/settings/network/telephony/gsm/OpenNetworkSelectPagePreferenceController.java

@@ -75,7 +75,7 @@ public class OpenNetworkSelectPagePreferenceController extends
     public CharSequence getSummary() {
         final ServiceState ss = mTelephonyManager.getServiceState();
         if (ss != null && ss.getState() == ServiceState.STATE_IN_SERVICE) {
-            return mTelephonyManager.getNetworkOperatorName();
+            return MobileNetworkUtils.getCurrentCarrierNameForDisplay(mContext, mSubId);
         } else {
             return mContext.getString(R.string.network_disconnected);
         }
@@ -108,4 +108,4 @@ public class OpenNetworkSelectPagePreferenceController extends
     public void onNetworkSelectModeChanged() {
         updateState(mPreference);
     }
-}
+}