Fix crash on scrolling while refreshing

app/src/main/java/app/insti/fragment/NewsFragment.java

@@ -56,7 +56,7 @@ public class NewsFragment extends RecyclerViewFragment<NewsArticle, NewsAdapter>
     }
 
     @Override
-    Call<List<NewsArticle>> getCall(RetrofitInterface retrofitInterface, String sessionIDHeader) {
-        return retrofitInterface.getNews(sessionIDHeader, getPostCount(), 20, searchQuery);
+    Call<List<NewsArticle>> getCall(RetrofitInterface retrofitInterface, String sessionIDHeader, int postCount) {
+        return retrofitInterface.getNews(sessionIDHeader, postCount, 20, searchQuery);
     }
 }

app/src/main/java/app/insti/fragment/PlacementBlogFragment.java

@@ -73,7 +73,7 @@ public class PlacementBlogFragment extends RecyclerViewFragment<PlacementBlogPos
     }
 
     @Override
-    Call<List<PlacementBlogPost>> getCall(RetrofitInterface retrofitInterface, String sessionIDHeader) {
-        return retrofitInterface.getPlacementBlogFeed(sessionIDHeader, getPostCount(), 20, searchQuery);
+    Call<List<PlacementBlogPost>> getCall(RetrofitInterface retrofitInterface, String sessionIDHeader, int postCount) {
+        return retrofitInterface.getPlacementBlogFeed(sessionIDHeader, postCount, 20, searchQuery);
     }
 }

app/src/main/java/app/insti/fragment/RecyclerViewFragment.java

@@ -48,13 +48,12 @@ public abstract class RecyclerViewFragment<T extends Browsable, S extends Recycl
         if (getActivity() == null || getView() == null) return;
 
         // Clear variables
-        clearPosts();
         allLoaded = false;
 
         // Make the request
         String sessionIDHeader = ((MainActivity) getActivity()).getSessionIDHeader();
         RetrofitInterface retrofitInterface = ((MainActivity) getActivity()).getRetrofitInterface();
-        Call<List<T>> call = getCall(retrofitInterface, sessionIDHeader);
+        Call<List<T>> call = getCall(retrofitInterface, sessionIDHeader, 0);
         call.enqueue(new Callback<List<T>>() {
             @Override
             public void onResponse(Call<List<T>> call, Response<List<T>> response) {
@@ -72,7 +71,7 @@ public abstract class RecyclerViewFragment<T extends Browsable, S extends Recycl
         });
     }
 
-    abstract Call<List<T>> getCall(RetrofitInterface retrofitInterface, String sessionIDHeader);
+    abstract Call<List<T>> getCall(RetrofitInterface retrofitInterface, String sessionIDHeader, int postCount);
 
     private void displayData(final List<T> result) {
         /* Skip if we're already destroyed */
@@ -122,7 +121,7 @@ public abstract class RecyclerViewFragment<T extends Browsable, S extends Recycl
                                 loading = true;
                                 String sessionIDHeader = ((MainActivity) getActivity()).getSessionIDHeader();
                                 RetrofitInterface retrofitInterface = ((MainActivity) getActivity()).getRetrofitInterface();
-                                Call<List<T>> call = getCall(retrofitInterface, sessionIDHeader);
+                                Call<List<T>> call = getCall(retrofitInterface, sessionIDHeader, getPostCount());
                                 call.enqueue(new Callback<List<T>>() {
                                     @Override
                                     public void onResponse(Call<List<T>> call, Response<List<T>> response) {
@@ -153,12 +152,6 @@ public abstract class RecyclerViewFragment<T extends Browsable, S extends Recycl
         });
     }
 
-    protected void clearPosts() {
-        if (adapter != null) {
-            adapter.setPosts(new ArrayList<T>());
-        }
-    }
-
     protected int getPostCount() {
         if (adapter == null) { return 0; }
         return adapter.getPosts().size();

app/src/main/java/app/insti/fragment/TrainingBlogFragment.java

@@ -73,7 +73,7 @@ public class TrainingBlogFragment extends RecyclerViewFragment<TrainingBlogPost,
     }
 
     @Override
-    Call<List<TrainingBlogPost>> getCall(RetrofitInterface retrofitInterface, String sessionIDHeader) {
-        return retrofitInterface.getTrainingBlogFeed(sessionIDHeader, getPostCount(), 20, searchQuery);
+    Call<List<TrainingBlogPost>> getCall(RetrofitInterface retrofitInterface, String sessionIDHeader, int postCount) {
+        return retrofitInterface.getTrainingBlogFeed(sessionIDHeader, postCount, 20, searchQuery);
     }
 }