Prevent stale events from showing over fresh ones in Feed

app/src/main/java/in/ac/iitb/gymkhana/iitbapp/fragment/FeedFragment.java

@@ -42,6 +42,7 @@ public class FeedFragment extends BaseFragment {
     private SwipeRefreshLayout feedSwipeRefreshLayout;
     private AppDatabase appDatabase;
     private FloatingActionButton fab;
+    private boolean freshEventsDisplayed = false;
 
     public FeedFragment() {
         // Required empty public constructor
@@ -98,6 +99,7 @@ public class FeedFragment extends BaseFragment {
                 if (response.isSuccessful()) {
                     NewsFeedResponse newsFeedResponse = response.body();
                     List<Event> events = newsFeedResponse.getEvents();
+                    freshEventsDisplayed = true;
                     displayEvents(events);
 
                     new updateDatabase().execute(events);
@@ -163,7 +165,9 @@ public class FeedFragment extends BaseFragment {
         }
 
         protected void onPostExecute(List<Event> result) {
+            if (!freshEventsDisplayed) {
                 displayEvents(result);
             }
         }
+    }
 }