Fix header crash while scrolling in a playlist or just after deleting a video in it

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

@@ -28,6 +28,8 @@
 import static org.schabi.newpipe.ktx.ViewUtils.animateHideRecyclerViewAllowingScrolling;
 import static org.schabi.newpipe.util.ThemeHelper.getItemViewMode;
 
+import java.util.function.Supplier;
+
 /**
  * This fragment is design to be used with persistent data such as
  * {@link org.schabi.newpipe.database.LocalItem}, and does not cache the data contained
@@ -100,7 +102,7 @@ private void refreshItemViewMode() {
     //////////////////////////////////////////////////////////////////////////*/
 
     @Nullable
-    protected ViewBinding getListHeader() {
+    protected Supplier<View> getListHeaderSupplier() {
         return null;
     }
 
@@ -131,9 +133,9 @@ protected void initViews(final View rootView, final Bundle savedInstanceState) {
         itemsList = rootView.findViewById(R.id.items_list);
         refreshItemViewMode();
 
-        headerRootBinding = getListHeader();
-        if (headerRootBinding != null) {
-            itemListAdapter.setHeader(headerRootBinding.getRoot());
+        final Supplier<View> listHeaderSupplier = getListHeaderSupplier();
+        if (listHeaderSupplier != null) {
+            itemListAdapter.setHeaderSupplier(listHeaderSupplier);
         }
         footerRootBinding = getListFooter();
         itemListAdapter.setFooter(footerRootBinding.getRoot());

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

@@ -37,6 +37,7 @@
 import java.time.format.FormatStyle;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.function.Supplier;
 
 /*
  * Created by Christian Schabesberger on 01.08.16.
@@ -88,7 +89,7 @@ public class LocalItemListAdapter extends RecyclerView.Adapter<RecyclerView.View
     private final DateTimeFormatter dateTimeFormatter;
 
     private boolean showFooter = false;
-    private View header = null;
+    private Supplier<View> headerSupplier = null;
     private View footer = null;
     private ItemViewMode itemViewMode = ItemViewMode.LIST;
     private boolean useItemHandle = false;
@@ -97,6 +98,7 @@ public LocalItemListAdapter(final Context context) {
         recordManager = new HistoryRecordManager(context);
         localItemBuilder = new LocalItemBuilder(context);
         localItems = new ArrayList<>();
+
         dateTimeFormatter = DateTimeFormatter.ofLocalizedDate(FormatStyle.SHORT)
                 .withLocale(Localization.getPreferredLocale(context));
     }
@@ -124,7 +126,7 @@ public void addItems(@Nullable final List<? extends LocalItem> data) {
         if (DEBUG) {
             Log.d(TAG, "addItems() after > offsetStart = " + offsetStart + ", "
                     + "localItems.size() = " + localItems.size() + ", "
-                    + "header = " + header + ", footer = " + footer + ", "
+                    + "header = " + hasHeader() + ", footer = " + footer + ", "
                     + "showFooter = " + showFooter);
         }
         notifyItemRangeInserted(offsetStart, data.size());
@@ -144,7 +146,7 @@ public void removeItem(final LocalItem data) {
         final int index = localItems.indexOf(data);
         if (index != -1) {
             localItems.remove(index);
-            notifyItemRemoved(index + (header != null ? 1 : 0));
+            notifyItemRemoved(index + (hasHeader() ? 1 : 0));
         } else {
             // this happens when
             // 1) removeItem is called on infoItemDuplicate as in showStreamItemDialog of
@@ -189,9 +191,9 @@ public void setUseItemHandle(final boolean useItemHandle) {
         this.useItemHandle = useItemHandle;
     }
 
-    public void setHeader(final View header) {
-        final boolean changed = header != this.header;
-        this.header = header;
+    public void setHeaderSupplier(@Nullable final Supplier<View> headerSupplier) {
+        final boolean changed = headerSupplier != this.headerSupplier;
+        this.headerSupplier = headerSupplier;
         if (changed) {
             notifyDataSetChanged();
         }
@@ -201,6 +203,10 @@ public void setFooter(final View view) {
         this.footer = view;
     }
 
+    protected boolean hasHeader() {
+        return this.headerSupplier != null;
+    }
+
     public void showFooter(final boolean show) {
         if (DEBUG) {
             Log.d(TAG, "showFooter() called with: show = [" + show + "]");
@@ -218,11 +224,11 @@ public void showFooter(final boolean show) {
     }
 
     private int adapterOffsetWithoutHeader(final int offset) {
-        return offset - (header != null ? 1 : 0);
+        return offset - (hasHeader() ? 1 : 0);
     }
 
     private int sizeConsideringHeader() {
-        return localItems.size() + (header != null ? 1 : 0);
+        return localItems.size() + (hasHeader() ? 1 : 0);
     }
 
     public ArrayList<LocalItem> getItemsList() {
@@ -232,7 +238,7 @@ public ArrayList<LocalItem> getItemsList() {
     @Override
     public int getItemCount() {
         int count = localItems.size();
-        if (header != null) {
+        if (hasHeader()) {
             count++;
         }
         if (footer != null && showFooter) {
@@ -242,7 +248,7 @@ public int getItemCount() {
         if (DEBUG) {
             Log.d(TAG, "getItemCount() called, count = " + count + ", "
                     + "localItems.size() = " + localItems.size() + ", "
-                    + "header = " + header + ", footer = " + footer + ", "
+                    + "header = " + hasHeader() + ", footer = " + footer + ", "
                     + "showFooter = " + showFooter);
         }
         return count;
@@ -255,9 +261,9 @@ public int getItemViewType(int position) {
             Log.d(TAG, "getItemViewType() called with: position = [" + position + "]");
         }
 
-        if (header != null && position == 0) {
+        if (hasHeader() && position == 0) {
             return HEADER_TYPE;
-        } else if (header != null) {
+        } else if (hasHeader()) {
             position--;
         }
         if (footer != null && position == localItems.size() && showFooter) {
@@ -318,7 +324,7 @@ public RecyclerView.ViewHolder onCreateViewHolder(@NonNull final ViewGroup paren
         }
         switch (type) {
             case HEADER_TYPE:
-                return new HeaderFooterHolder(header);
+                return new HeaderFooterHolder(headerSupplier.get());
             case FOOTER_TYPE:
                 return new HeaderFooterHolder(footer);
             case LOCAL_PLAYLIST_HOLDER_TYPE:
@@ -366,14 +372,14 @@ public void onBindViewHolder(@NonNull final RecyclerView.ViewHolder holder, int
 
         if (holder instanceof LocalItemHolder) {
             // If header isn't null, offset the items by -1
-            if (header != null) {
+            if (hasHeader()) {
                 position--;
             }
 
             ((LocalItemHolder) holder)
                     .updateFromItem(localItems.get(position), recordManager, dateTimeFormatter);
-        } else if (holder instanceof HeaderFooterHolder && position == 0 && header != null) {
-            ((HeaderFooterHolder) holder).view = header;
+        } else if (holder instanceof HeaderFooterHolder && position == 0 && hasHeader()) {
+            ((HeaderFooterHolder) holder).view = headerSupplier.get();
         } else if (holder instanceof HeaderFooterHolder && position == sizeConsideringHeader()
                 && footer != null && showFooter) {
             ((HeaderFooterHolder) holder).view = footer;
@@ -387,10 +393,10 @@ public void onBindViewHolder(@NonNull final RecyclerView.ViewHolder holder, fina
             for (final Object payload : payloads) {
                 if (payload instanceof StreamStateEntity) {
                     ((LocalItemHolder) holder).updateState(localItems
-                            .get(header == null ? position : position - 1), recordManager);
+                            .get(hasHeader() ? position - 1 : position), recordManager);
                 } else if (payload instanceof Boolean) {
                     ((LocalItemHolder) holder).updateState(localItems
-                            .get(header == null ? position : position - 1), recordManager);
+                            .get(hasHeader() ? position - 1 : position), recordManager);
                 }
             }
         } else {

app/src/main/java/org/schabi/newpipe/local/history/StatisticsPlaylistFragment.java

@@ -13,7 +13,6 @@
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import androidx.viewbinding.ViewBinding;
 
 import com.evernote.android.state.State;
 import com.google.android.material.snackbar.Snackbar;
@@ -45,6 +44,7 @@
 import java.util.Comparator;
 import java.util.List;
 import java.util.Objects;
+import java.util.function.Supplier;
 
 import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers;
 import io.reactivex.rxjava3.disposables.CompositeDisposable;
@@ -126,12 +126,12 @@ protected void initViews(final View rootView, final Bundle savedInstanceState) {
     }
 
     @Override
-    protected ViewBinding getListHeader() {
+    protected Supplier<View> getListHeaderSupplier() {
         headerBinding = StatisticPlaylistControlBinding.inflate(activity.getLayoutInflater(),
                 itemsList, false);
         playlistControlBinding = headerBinding.playlistControl;
 
-        return headerBinding;
+        return headerBinding::getRoot;
     }
 
     @Override

app/src/main/java/org/schabi/newpipe/local/playlist/LocalPlaylistFragment.java

@@ -29,7 +29,6 @@
 import androidx.appcompat.app.AlertDialog;
 import androidx.recyclerview.widget.ItemTouchHelper;
 import androidx.recyclerview.widget.RecyclerView;
-import androidx.viewbinding.ViewBinding;
 
 import com.evernote.android.state.State;
 import org.reactivestreams.Subscriber;
@@ -67,6 +66,7 @@
 import java.util.Collections;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.function.Supplier;
 import java.util.stream.Collectors;
 
 import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers;
@@ -158,14 +158,14 @@ protected void initViews(final View rootView, final Bundle savedInstanceState) {
     }
 
     @Override
-    protected ViewBinding getListHeader() {
+    protected Supplier<View> getListHeaderSupplier() {
         headerBinding = LocalPlaylistHeaderBinding.inflate(activity.getLayoutInflater(), itemsList,
-                false);
+            false);
         playlistControlBinding = headerBinding.playlistControl;
 
         headerBinding.playlistTitleView.setSelected(true);
 
-        return headerBinding;
+        return headerBinding::getRoot;
     }
 
     @Override