Continued working on a way to show that items are already in a playlist

app/src/main/java/org/schabi/newpipe/local/LocalItemListAdapter.java

@@ -347,7 +347,7 @@ public class LocalItemListAdapter extends RecyclerView.Adapter<RecyclerView.View
 
     @Override
     public long getItemId(final int position) {
-        final LocalItem item = localItems.get(0);
+        final LocalItem item = localItems.get(position);
         if (item != null && item.getLocalItemType() == LocalItem.LocalItemType.
                 PLAYLIST_LOCAL_ITEM) {
             return ((PlaylistMetadataEntry) item).uid;

app/src/main/java/org/schabi/newpipe/local/dialog/PlaylistAppendDialog.java

@@ -16,10 +16,10 @@ import org.schabi.newpipe.NewPipeDatabase;
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.database.playlist.PlaylistMetadataEntry;
 import org.schabi.newpipe.database.stream.model.StreamEntity;
+import org.schabi.newpipe.fragments.OnScrollBelowItemsListener;
 import org.schabi.newpipe.local.LocalItemListAdapter;
 import org.schabi.newpipe.local.playlist.LocalPlaylistManager;
 
-import java.util.HashMap;
 import java.util.List;
 
 import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers;
@@ -126,34 +126,44 @@ public final class PlaylistAppendDialog extends PlaylistDialog {
             playlistAdapter.addItems(playlists);
             playlistRecyclerView.setVisibility(View.VISIBLE);
 
-            final LocalPlaylistManager playlistManager =
+            playlistRecyclerView.addOnScrollListener(new DefaultItemListOnScrolledDownListener());
-                    new LocalPlaylistManager(NewPipeDatabase.getInstance(requireContext()));
+            initDuplicateIndicators(playlistRecyclerView);
-            final List<Long> duplicateIds = playlistManager.getDuplicatePlaylist(getStreamEntities()
+        }
-                    .get(0).getUrl()).blockingFirst();
+    }
 
-            final HashMap<Integer, Long> map = new HashMap<>();
+    public class DefaultItemListOnScrolledDownListener extends OnScrollBelowItemsListener {
-            for (int i = 0; i < playlists.size(); i++) {
+        @Override
-                map.put(i, playlists.get(i).uid);
+        public void onScrolledDown(final RecyclerView recyclerView) {
+            showDuplicateIndicators(recyclerView);
+        }
+    }
+
+    public void initDuplicateIndicators(@NonNull final RecyclerView view) {
+        view.postDelayed(new Runnable() {
+            @Override
+            public void run() {
+                showDuplicateIndicators(view);
             }
+        }, 50);
+    }
 
-            playlistRecyclerView.postDelayed(new Runnable() {
+    public void showDuplicateIndicators(final RecyclerView view) {
-                @Override
+        final LocalPlaylistManager playlistManager =
-                public void run() {
+                new LocalPlaylistManager(NewPipeDatabase.getInstance(requireContext()));
-                    if (playlistRecyclerView.getAdapter() == null) {
+        final List<Long> duplicateIds = playlistManager.getDuplicatePlaylist(getStreamEntities()
-                        return;
+                .get(0).getUrl()).blockingFirst();
-                    }
+
-                    final int count = playlistRecyclerView.getAdapter().getItemCount();
+        if (view.getAdapter() == null) {
-                    System.out.println(" kasjdflkalk" + playlistRecyclerView.getAdapter()
+            return;
-                            .getItemId(0));
+        }
-                    for (int i = 0; i < count; i++) {
+
-                        if (playlistRecyclerView.findViewHolderForAdapterPosition(i) != null
+        final int count = view.getAdapter().getItemCount();
-                                && duplicateIds.contains(playlistAdapter.getItemId(i))) {
+        for (int i = 0; i < count; i++) {
-                            playlistRecyclerView.findViewHolderForAdapterPosition(i).itemView
+            if (view.findViewHolderForAdapterPosition(i) != null
-                                    .findViewById(R.id.checkmark2).setVisibility(View.VISIBLE);
+                    && duplicateIds.contains(playlistAdapter.getItemId(i))) {
-                        }
+                view.findViewHolderForAdapterPosition(i).itemView
-                    }
+                        .findViewById(R.id.checkmark2).setVisibility(View.VISIBLE);
-                }
+            }
-            }, 1000);
         }
     }