Fix several item update events not being handled (#7377)

This lead to inconsistent display state.
Also, users were able to access items that no longer exist.

app/src/main/java/de/danoeh/antennapod/ui/screen/episode/ItemPagerFragment.java

@@ -14,6 +14,7 @@ import androidx.fragment.app.Fragment;
 import androidx.viewpager2.adapter.FragmentStateAdapter;
 import androidx.viewpager2.widget.ViewPager2;
 
+import de.danoeh.antennapod.event.UnreadItemsUpdateEvent;
 import de.danoeh.antennapod.model.feed.Feed;
 import de.danoeh.antennapod.ui.appstartintent.OnlineFeedviewActivityStarter;
 import org.greenrobot.eventbus.EventBus;
@@ -171,6 +172,11 @@ public class ItemPagerFragment extends Fragment implements MaterialToolbar.OnMen
         }
     }
 
+    @Subscribe(threadMode = ThreadMode.MAIN)
+    public void onEventMainThread(UnreadItemsUpdateEvent event) {
+        refreshToolbarState();
+    }
+
     private void openPodcast() {
         if (item == null) {
             return;

app/src/main/java/de/danoeh/antennapod/ui/screen/home/sections/DownloadsSection.java

@@ -12,6 +12,7 @@ import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 import de.danoeh.antennapod.R;
 import de.danoeh.antennapod.activity.MainActivity;
+import de.danoeh.antennapod.event.UnreadItemsUpdateEvent;
 import de.danoeh.antennapod.ui.episodeslist.EpisodeItemListAdapter;
 import de.danoeh.antennapod.event.DownloadLogEvent;
 import de.danoeh.antennapod.ui.MenuItemUtils;
@@ -111,6 +112,11 @@ public class DownloadsSection extends HomeSection {
         loadItems();
     }
 
+    @Subscribe(threadMode = ThreadMode.MAIN)
+    public void onUnreadItemsUpdateEvent(UnreadItemsUpdateEvent event) {
+        loadItems();
+    }
+
     @Override
     protected String getSectionTitle() {
         return getString(R.string.home_downloads_title);

app/src/main/java/de/danoeh/antennapod/ui/screen/home/sections/EpisodesSurpriseSection.java

@@ -12,6 +12,7 @@ import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 import de.danoeh.antennapod.R;
 import de.danoeh.antennapod.activity.MainActivity;
+import de.danoeh.antennapod.event.FeedListUpdateEvent;
 import de.danoeh.antennapod.ui.episodeslist.HorizontalItemListAdapter;
 import de.danoeh.antennapod.ui.MenuItemUtils;
 import de.danoeh.antennapod.storage.database.DBReader;
@@ -123,6 +124,11 @@ public class EpisodesSurpriseSection extends HomeSection {
         }
     }
 
+    @Subscribe(threadMode = ThreadMode.MAIN)
+    public void onEventMainThread(FeedListUpdateEvent event) {
+        loadItems();
+    }
+
     @Subscribe(threadMode = ThreadMode.MAIN)
     public void onEventMainThread(PlaybackPositionEvent event) {
         if (listAdapter == null) {

app/src/main/java/de/danoeh/antennapod/ui/screen/playback/audio/AudioPlayerFragment.java

@@ -362,7 +362,10 @@ public class AudioPlayerFragment extends Fragment implements
         int currentPosition = converter.convert(event.getPosition());
         int duration = converter.convert(event.getDuration());
         int remainingTime = converter.convert(Math.max(event.getDuration() - event.getPosition(), 0));
-        currentChapterIndex = Chapter.getAfterPosition(controller.getMedia().getChapters(), currentPosition);
+        @Nullable Playable media = controller.getMedia();
+        if (media != null) {
+            currentChapterIndex = Chapter.getAfterPosition(media.getChapters(), currentPosition);
+        }
         Log.d(TAG, "currentPosition " + Converter.getDurationStringLong(currentPosition));
         if (currentPosition == Playable.INVALID_TIME || duration == Playable.INVALID_TIME) {
             Log.w(TAG, "Could not react to position observer update because of invalid time");