1. Fix NavDirection compile issue.

2. Fix null pointer if tab order pref is null.
3. Set initial tab order in pref if empty.

app/src/main/java/awais/instagrabber/fragments/NotificationsViewerFragment.java

@@ -79,7 +79,7 @@ public final class NotificationsViewerFragment extends Fragment implements Swipe
                 binding.swipeRefreshLayout.setRefreshing(false);
                 Toast.makeText(getContext(), t.getMessage(), Toast.LENGTH_SHORT).show();
             }
-            catch(Throwable e) {}
+            catch(Throwable ignored) {}
         }
     };
 
@@ -92,7 +92,7 @@ public final class NotificationsViewerFragment extends Fragment implements Swipe
         @Override
         public void onPreviewClick(final Notification model) {
             final NotificationImage notificationImage = model.getArgs().getMedia().get(0);
-            final long mediaId = Long.valueOf(notificationImage.getId().split("_")[0]);
+            final long mediaId = Long.parseLong(notificationImage.getId().split("_")[0]);
             if (model.getType() == NotificationType.RESPONDED_STORY) {
                 final NavDirections action = NotificationsViewerFragmentDirections
                         .actionNotificationsViewerFragmentToStoryViewerFragment(
@@ -277,8 +277,7 @@ public final class NotificationsViewerFragment extends Fragment implements Swipe
     }
 
     private void openProfile(final String username) {
-        final NavDirections action = NotificationsViewerFragmentDirections
-                .actionGlobalProfileFragment("@" + username);
+        final NavDirections action = NotificationsViewerFragmentDirections.actionGlobalProfileFragment("@" + username);
         NavHostFragment.findNavController(this).navigate(action);
     }
 }

app/src/main/java/awais/instagrabber/utils/Utils.java

@@ -31,7 +31,6 @@ import android.webkit.MimeTypeMap;
 import android.widget.Toast;
 
 import androidx.annotation.DrawableRes;
-import androidx.annotation.IdRes;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.ActionBar;
@@ -474,7 +473,10 @@ public final class Utils {
         final List<String> navGraphNameList = Arrays.asList(navGraphNames);
         if (TextUtils.isEmpty(tabOrderString)) {
             // Use top 5 entries for default list
-            return navGraphNameList.subList(0, 5);
+            final List<String> top5navGraphNames = navGraphNameList.subList(0, 5);
+            final String newOrderString = android.text.TextUtils.join(",", top5navGraphNames);
+            Utils.settingsHelper.putString(PreferenceKeys.PREF_TAB_ORDER, newOrderString);
+            return top5navGraphNames;
         }
         // Make sure that the list from preference does not contain any invalid values
         final List<String> orderGraphNames = Arrays.stream(tabOrderString.split(","))
@@ -489,6 +491,7 @@ public final class Utils {
     }
 
     public static boolean isNavRootInCurrentTabs(final String navRootString) {
+        if (navRootString == null || tabOrderString == null) return false;
         return tabOrderString.contains(navRootString);
     }
 }

app/src/main/res/navigation/notification_viewer_nav_graph.xml

@@ -5,25 +5,6 @@
     android:id="@+id/notification_viewer_nav_graph"
     app:startDestination="@id/notificationsViewer">
 
-    <fragment
-        android:id="@+id/notificationsViewer"
-        android:name="awais.instagrabber.fragments.NotificationsViewerFragment"
-        android:label="@string/title_notifications"
-        tools:layout="@layout/fragment_notifications_viewer">
-        <argument
-            android:name="type"
-            app:argType="string"
-            app:nullable="false"
-            android:defaultValue="notif"/>
-        <argument
-            android:name="targetId"
-            android:defaultValue="0L"
-            app:argType="long" />
-        <action
-            android:id="@+id/action_notificationsViewerFragment_to_storyViewerFragment"
-            app:destination="@id/storyViewerFragment" />
-    </fragment>
-
     <include app:graph="@navigation/profile_nav_graph" />
 
     <action
@@ -100,4 +81,23 @@
             android:name="options"
             app:argType="awais.instagrabber.repositories.requests.StoryViewerOptions" />
     </fragment>
+
+    <fragment
+        android:id="@+id/notificationsViewer"
+        android:name="awais.instagrabber.fragments.NotificationsViewerFragment"
+        android:label="@string/title_notifications"
+        tools:layout="@layout/fragment_notifications_viewer">
+        <argument
+            android:name="type"
+            app:argType="string"
+            app:nullable="false"
+            android:defaultValue="notif"/>
+        <argument
+            android:name="targetId"
+            android:defaultValue="0L"
+            app:argType="long" />
+        <action
+            android:id="@+id/action_notificationsViewerFragment_to_storyViewerFragment"
+            app:destination="@id/storyViewerFragment" />
+    </fragment>
 </navigation>