From 738db8306f3b0a1b7c06c2eeaa31b1e1aa964a06 Mon Sep 17 00:00:00 2001
From: neslihanturan <tur.neslihan@gmail.com>
Date: Fri, 7 Sep 2018 18:53:57 +0300
Subject: [PATCH] Register and unregister datasetObservers

---
 .../contributions/ContributionsFragment.java  | 20 +++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/app/src/main/java/fr/free/nrw/commons/contributions/ContributionsFragment.java b/app/src/main/java/fr/free/nrw/commons/contributions/ContributionsFragment.java
index 2a2c7ba29..077ada12d 100644
--- a/app/src/main/java/fr/free/nrw/commons/contributions/ContributionsFragment.java
+++ b/app/src/main/java/fr/free/nrw/commons/contributions/ContributionsFragment.java
@@ -332,22 +332,26 @@ public class ContributionsFragment
         return contributionsListFragment.getAdapter().getCount();
     }
 
-    @Override
-    public void notifyDatasetChanged() {
-
-    }
-
     @Override
     public void registerDataSetObserver(DataSetObserver observer) {
-
+        Adapter adapter = contributionsListFragment.getAdapter();
+        if (adapter == null) {
+            observersWaitingForLoad.add(observer);
+        } else {
+            adapter.registerDataSetObserver(observer);
+        }
     }
 
     @Override
     public void unregisterDataSetObserver(DataSetObserver observer) {
-
+        Adapter adapter = contributionsListFragment.getAdapter();
+        if (adapter == null) {
+            observersWaitingForLoad.remove(observer);
+        } else {
+            adapter.unregisterDataSetObserver(observer);
+        }
     }
 
-
     @SuppressWarnings("ConstantConditions")
     private void setUploadCount() {