Keep follow requests at top in notification viewer

app/src/main/java/awais/instagrabber/adapters/NotificationsAdapter.java

@@ -4,13 +4,19 @@ import android.view.LayoutInflater;
 import android.view.ViewGroup;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.recyclerview.widget.DiffUtil;
 import androidx.recyclerview.widget.ListAdapter;
 
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
 import awais.instagrabber.adapters.viewholder.NotificationViewHolder;
 import awais.instagrabber.databinding.ItemNotificationBinding;
 import awais.instagrabber.interfaces.MentionClickListener;
 import awais.instagrabber.models.NotificationModel;
+import awais.instagrabber.models.enums.NotificationType;
 
 public final class NotificationsAdapter extends ListAdapter<NotificationModel, NotificationViewHolder> {
     private final OnNotificationClickListener notificationClickListener;
@@ -49,6 +55,36 @@ public final class NotificationsAdapter extends ListAdapter<NotificationModel, N
         holder.bind(notificationModel, notificationClickListener);
     }
 
+    @Override
+    public void submitList(@Nullable final List<NotificationModel> list, @Nullable final Runnable commitCallback) {
+        if (list == null) {
+            super.submitList(null, commitCallback);
+            return;
+        }
+        super.submitList(sort(list), commitCallback);
+    }
+
+    @Override
+    public void submitList(@Nullable final List<NotificationModel> list) {
+        if (list == null) {
+            super.submitList(null);
+            return;
+        }
+        super.submitList(sort(list));
+    }
+
+    private List<NotificationModel> sort(final List<NotificationModel> list) {
+        final List<NotificationModel> listCopy = new ArrayList<>(list);
+        Collections.sort(listCopy, (o1, o2) -> {
+            if (o1.getType() == o2.getType()) return 0;
+            // keep requests at top
+            if (o1.getType() == NotificationType.REQUEST) return -1;
+            if (o2.getType() == NotificationType.REQUEST) return 1;
+            return 0;
+        });
+        return listCopy;
+    }
+
     public interface OnNotificationClickListener {
         void onNotificationClick(final NotificationModel model);
     }