Display a custom error view when there is something wrong when loading best posts. Probably fix a bug that holder.getAdapterPosition() returns -1 when loading subreddit icons in the RecyclerView of PostFragment. Subreddit banners are parsed correctly in ParseSubscribedThing. Check if the api call is successful in onResponse. Rewrite some methods.

app/src/main/res/layout/activity_view_subreddit_detail.xml

@@ -21,7 +21,7 @@
             android:layout_height="match_parent"
             android:fitsSystemWindows="true"
             app:contentScrim="?attr/colorPrimary"
-            app:layout_scrollFlags="scroll|exitUntilCollapsed"
+            app:layout_scrollFlags="scroll|enterAlways|enterAlwaysCollapsed"
             app:toolbarId="@+id/toolbar">
 
             <RelativeLayout
@@ -109,6 +109,7 @@
                 android:layout_width="match_parent"
                 android:layout_height="?attr/actionBarSize"
                 app:layout_collapseMode="pin"
+                app:layout_scrollFlags="scroll|enterAlways|enterAlwaysCollapsed"
                 app:popupTheme="@style/AppTheme.PopupOverlay"
                 app:navigationIcon="?attr/homeAsUpIndicator" />
 

app/src/main/res/layout/fragment_post.xml

@@ -19,6 +19,28 @@
         android:layout_width="match_parent"
         android:layout_height="match_parent" />
 
+    <LinearLayout
+        android:id="@+id/fetch_post_error_linear_layout_post_fragment"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:gravity="center"
+        android:orientation="vertical"
+        android:visibility="gone">
+
+        <ImageView
+            android:id="@+id/fetch_post_error_image_view_post_fragment"
+            android:layout_width="150dp"
+            android:layout_height="wrap_content" />
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="16dp"
+            android:gravity="center"
+            android:text="@string/load_posts_error"/>
+
+    </LinearLayout>
+
     <!--<android.support.design.widget.FloatingActionButton
         android:id="@+id/fab_post_fragment"
         android:layout_width="wrap_content"

app/src/main/res/values/strings.xml

@@ -8,6 +8,8 @@
     <string name="action_settings">Settings</string>
     <string name="action_download">Download</string>
 
+    <string name="load_posts_error">Error loading posts.\nTap to retry.</string>
+
     <string name="load_data_failed">Cannot load posts</string>
     <string name="load_comment_failed">Error loading comments</string>
     <string name="retry">Retry</string>