Update signal strength on ServiceState in service

Test: make RunSettingsRobotTests
Bug: 167643728
Change-Id: Ibf69f9e9ec2acafef1316069d37b8d2a27d7d4d7
Merged-In: Ibf69f9e9ec2acafef1316069d37b8d2a27d7d4d7
(cherry picked from commit 3b3704d693)

src/com/android/settings/deviceinfo/simstatus/SimStatusDialogController.java

@@ -140,6 +140,7 @@ public class SimStatusDialogController implements LifecycleObserver, OnResume, O
 
     private SubscriptionInfo mSubscriptionInfo;
     private TelephonyDisplayInfo mTelephonyDisplayInfo;
+    private ServiceState mPreviousServiceState;
 
     private final int mSlotIndex;
     private TelephonyManager mTelephonyManager;
@@ -425,6 +426,9 @@ public class SimStatusDialogController implements LifecycleObserver, OnResume, O
         final int state = Utils.getCombinedServiceState(serviceState);
         if (!Utils.isInService(serviceState)) {
             resetSignalStrength();
+        } else if (!Utils.isInService(mPreviousServiceState)) {
+            // If ServiceState changed from out of service -> in service, update signal strength.
+            updateSignalStrength(mTelephonyManager.getSignalStrength());
         }
 
         String serviceStateValue;
@@ -472,7 +476,7 @@ public class SimStatusDialogController implements LifecycleObserver, OnResume, O
         }
 
         ServiceState serviceState = mTelephonyManager.getServiceState();
-        if (serviceState == null || !Utils.isInService(serviceState)) {
+        if (!Utils.isInService(serviceState)) {
             return;
         }
 
@@ -755,6 +759,7 @@ public class SimStatusDialogController implements LifecycleObserver, OnResume, O
                 updateNetworkProvider();
                 updateServiceState(serviceState);
                 updateRoamingStatus(serviceState);
+                mPreviousServiceState = serviceState;
             }
 
             @Override