[Settings] Resolves unsynced infomation between status bar and settings

When activity go to background, the UI message shall be saved, and When
 activity is back to foreground, the UI shows previous state first.
 The situation make unsynced info between status bar and settings's
 page.

Bug: 187091965
Test: Maunal Test
Test: atest passed
Change-Id: I7db2876e91c00126ebfa9dfa5b87d04c1f717e72

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

@@ -38,6 +38,7 @@ import android.telephony.TelephonyDisplayInfo;
 import android.telephony.TelephonyManager;
 import android.text.Html;
 import android.util.ArraySet;
+import android.util.Log;
 
 import androidx.annotation.VisibleForTesting;
 import androidx.collection.ArrayMap;
@@ -196,6 +197,7 @@ public class SubscriptionsPreferenceController extends AbstractPreferenceControl
         mSignalStrengthListener.pause();
         mTelephonyDisplayInfoListener.pause();
         unRegisterReceiver();
+        resetProviderPreferenceSummary();
     }
 
     @Override
@@ -275,6 +277,7 @@ public class SubscriptionsPreferenceController extends AbstractPreferenceControl
         String result = mSubsPrefCtrlInjector.getNetworkType(
                 mContext, mConfig, mTelephonyDisplayInfo, subId, isActiveCarrierNetwork);
         if (mSubsPrefCtrlInjector.isActiveCellularNetwork(mContext) || isActiveCarrierNetwork) {
+            Log.i(TAG, "Active cellular network or active carrier network.");
             result = mContext.getString(R.string.preference_summary_default_combination,
                     mContext.getString(R.string.mobile_data_connection_active), result);
         } else if (!isDataInService) {
@@ -316,6 +319,13 @@ public class SubscriptionsPreferenceController extends AbstractPreferenceControl
         return icon;
     }
 
+    private void resetProviderPreferenceSummary() {
+        if (mSubsGearPref == null) {
+            return;
+        }
+        mSubsGearPref.setSummary("");
+    }
+
     private void updateForBase() {
         final Map<Integer, Preference> existingPrefs = mSubscriptionPreferences;
         mSubscriptionPreferences = new ArrayMap<>();