sort in podcast screen - logic, no db persistence yet.

app/src/main/java/de/danoeh/antennapod/fragment/FeedItemlistFragment.java

@@ -34,6 +34,7 @@ import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
 import org.greenrobot.eventbus.ThreadMode;
 
+import java.util.Collections;
 import java.util.List;
 
 import de.danoeh.antennapod.R;
@@ -52,6 +53,7 @@ import de.danoeh.antennapod.core.feed.FeedEvent;
 import de.danoeh.antennapod.core.feed.FeedItem;
 import de.danoeh.antennapod.core.feed.FeedItemFilter;
 import de.danoeh.antennapod.core.feed.FeedMedia;
+import de.danoeh.antennapod.core.feed.IntraFeedSortOrder;
 import de.danoeh.antennapod.core.glide.ApGlideSettings;
 import de.danoeh.antennapod.core.glide.FastBlurTransformation;
 import de.danoeh.antennapod.core.service.download.DownloadService;
@@ -63,6 +65,7 @@ import de.danoeh.antennapod.core.storage.DownloadRequester;
 import de.danoeh.antennapod.core.util.FeedItemUtil;
 import de.danoeh.antennapod.core.util.LongList;
 import de.danoeh.antennapod.core.util.Optional;
+import de.danoeh.antennapod.core.util.comparator.FeedItemPubdateComparator;
 import de.danoeh.antennapod.core.util.gui.MoreContentListFooterUtil;
 import de.danoeh.antennapod.dialog.EpisodesApplyActionFragment;
 import de.danoeh.antennapod.dialog.RenameFeedDialog;
@@ -625,13 +628,26 @@ public class FeedItemlistFragment extends ListFragment {
 
     @NonNull
     private Optional<Feed> loadData() {
-        // TODO-2524: apply sorting, either at db level or here
         Feed feed = DBReader.getFeed(feedID);
         if (feed != null && feed.getItemFilter() != null) {
             DBReader.loadAdditionalFeedItemListData(feed.getItems());
             FeedItemFilter filter = feed.getItemFilter();
             feed.setItems(filter.filter(feed.getItems()));
         }
+        IntraFeedSortOrder sortOrder = feed.getSortOrder();
+        if (sortOrder != null) {
+            long tS = System.currentTimeMillis(); // TODO-2524:
+            if (sortOrder == IntraFeedSortOrder.DATE_OLD_NEW) {
+                List<FeedItem> feedItems = feed.getItems();
+                Collections.sort(feedItems, FeedItemPubdateComparator.ascending);
+                feed.setItems(feedItems);
+            } else {
+                System.err.println("DBG - to-implement: " + sortOrder); // TODO-2524:
+            }
+            long tE = System.currentTimeMillis();
+            System.err.println("DBG - sort elapsed time: " + (tE -tS) +
+                    "ms ; " + "num items: " + feed.getItems().size() + ", order: " + sortOrder); // TODO: 2524
+        }
         return Optional.ofNullable(feed);
     }
 

app/src/main/java/de/danoeh/antennapod/menuhandler/FeedMenuHandler.java

@@ -122,7 +122,7 @@ public class FeedMenuHandler {
             @Override
             protected void updateSort(@NonNull IntraFeedSortOrder sortOrder) {
                 selectedFeed.setSortOrder(sortOrder);
-                // TODO-2524: update in db
+                DBWriter.setFeedItemSortOrder(selectedFeed.getId(), sortOrder);
             }
         };
         sortDialog.openDialog();

core/src/main/java/de/danoeh/antennapod/core/feed/FeedEvent.java

@@ -6,7 +6,8 @@ import org.apache.commons.lang3.builder.ToStringStyle;
 public class FeedEvent {
 
     public enum Action {
-        FILTER_CHANGED
+        FILTER_CHANGED,
+        SORT_ORDER_CHANGED
     }
 
     private final Action action;

core/src/main/java/de/danoeh/antennapod/core/storage/DBWriter.java

@@ -5,6 +5,7 @@ import android.content.Context;
 import android.util.Log;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 
 import org.greenrobot.eventbus.EventBus;
 
@@ -30,6 +31,7 @@ import de.danoeh.antennapod.core.feed.FeedEvent;
 import de.danoeh.antennapod.core.feed.FeedItem;
 import de.danoeh.antennapod.core.feed.FeedMedia;
 import de.danoeh.antennapod.core.feed.FeedPreferences;
+import de.danoeh.antennapod.core.feed.IntraFeedSortOrder;
 import de.danoeh.antennapod.core.gpoddernet.model.GpodnetEpisodeAction;
 import de.danoeh.antennapod.core.preferences.GpodnetPreferences;
 import de.danoeh.antennapod.core.preferences.PlaybackPreferences;
@@ -944,6 +946,19 @@ public class DBWriter {
         });
     }
 
+    /**
+     * Set item sort order of the feed
+     *
+     */
+    public static Future<?> setFeedItemSortOrder(long feedId, @Nullable IntraFeedSortOrder sortOrder) {
+        return dbExec.submit(() -> {
+            PodDBAdapter adapter = PodDBAdapter.getInstance();
+            adapter.open();
+            // adapter.setFeedItemSortOrder(feedId, sortOrder);
+            adapter.close();
+            EventBus.getDefault().post(new FeedEvent(FeedEvent.Action.SORT_ORDER_CHANGED, feedId));
+        });
+    }
 
     /**
      * Reset the statistics in DB

core/src/main/java/de/danoeh/antennapod/core/util/comparator/FeedItemPubdateComparator.java

@@ -1,5 +1,6 @@
 package de.danoeh.antennapod.core.util.comparator;
 
+import java.util.Collections;
 import java.util.Comparator;
 
 import de.danoeh.antennapod.core.feed.FeedItem;
@@ -7,6 +8,9 @@ import de.danoeh.antennapod.core.feed.FeedItem;
 /** Compares the pubDate of two FeedItems for sorting*/
 public class FeedItemPubdateComparator implements Comparator<FeedItem> {
 
+	public static final Comparator<FeedItem> descending = new FeedItemPubdateComparator();
+	public static final Comparator<FeedItem> ascending = Collections.reverseOrder(new FeedItemPubdateComparator());
+
 	/** Returns a new instance of this comparator in reverse order.
 	public static FeedItemPubdateComparator newInstance() {
 		FeedItemPubdateComparator