Implement Get/Set UCE property from subinfo database

Bug: 148167230
Test: atest CtsTelephonyTestCases:RceUceAdapterTest
Change-Id: I7ef13240241b8369b1d2642c30f7128994f680d8
diff --git a/src/com/android/phone/ImsRcsController.java b/src/com/android/phone/ImsRcsController.java
index ffac202..48300c9 100644
--- a/src/com/android/phone/ImsRcsController.java
+++ b/src/com/android/phone/ImsRcsController.java
@@ -20,6 +20,7 @@
 import android.os.Binder;
 import android.os.RemoteException;
 import android.os.ServiceSpecificException;
+import android.telephony.SubscriptionManager;
 import android.telephony.TelephonyFrameworkInitializer;
 import android.telephony.ims.ImsException;
 import android.telephony.ims.RegistrationManager;
@@ -260,12 +261,15 @@
     @Override
     public boolean isUceSettingEnabled(int subId) {
         enforceReadPrivilegedPermission("isUceSettingEnabled");
-        return false;
+        return SubscriptionManager.getBooleanSubscriptionProperty(subId,
+                SubscriptionManager.IMS_RCS_UCE_ENABLED, false /*defaultValue*/, mApp);
     }
 
     @Override
     public void setUceSettingEnabled(int subId, boolean isEnabled) {
         enforceModifyPermission();
+        SubscriptionManager.setSubscriptionProperty(subId, SubscriptionManager.IMS_RCS_UCE_ENABLED,
+                (isEnabled ? "1" : "0"));
     }
 
     /**