Update LiveData value when becoming active

Allow LiveData to stay up to date, especially when resuming an activity

Author: RemiLatapy

examples/architectureComponentsExample/src/main/java/io/realm/examples/arch/livemodel/LiveRealmObject.java

@@ -87,6 +87,7 @@ protected void onActive() {
         super.onActive();
         T object = getValue();
         if (object != null && RealmObject.isValid(object)) {
+            setValue(object);
             RealmObject.addChangeListener(object, listener);
         }
     }

examples/architectureComponentsExample/src/main/java/io/realm/examples/arch/livemodel/LiveRealmResults.java

@@ -77,6 +77,7 @@ public LiveRealmResults(@NonNull RealmResults<T> results) {
     protected void onActive() {
         super.onActive();
         if (results.isValid()) { // invalidated results can no longer be observed.
+            LiveRealmResults.this.setValue(results);
             results.addChangeListener(listener);
         }
     }