diff --git a/libs/androidfw/AssetManager2.cpp b/libs/androidfw/AssetManager2.cpp
index 22904a0..136fc6c 100644
--- a/libs/androidfw/AssetManager2.cpp
+++ b/libs/androidfw/AssetManager2.cpp
@@ -902,6 +902,27 @@
   return log_stream.str();
 }
 
+base::expected<uint32_t, NullOrIOError> AssetManager2::GetParentThemeResourceId(uint32_t resid)
+const {
+  auto entry = FindEntry(resid, 0u /* density_override */,
+                         false /* stop_at_first_match */,
+                         false /* ignore_configuration */);
+  if (!entry.has_value()) {
+    return base::unexpected(entry.error());
+  }
+
+  auto entry_map = std::get_if<incfs::verified_map_ptr<ResTable_map_entry>>(&entry->entry);
+  if (entry_map == nullptr) {
+    // Not a bag, nothing to do.
+    return base::unexpected(std::nullopt);
+  }
+
+  auto map = *entry_map;
+  const uint32_t parent_resid = dtohl(map->parent.ident);
+
+  return parent_resid;
+}
+
 base::expected<AssetManager2::ResourceName, NullOrIOError> AssetManager2::GetResourceName(
     uint32_t resid) const {
   auto result = FindEntry(resid, 0u /* density_override */, true /* stop_at_first_match */,
diff --git a/libs/androidfw/include/androidfw/AssetManager2.h b/libs/androidfw/include/androidfw/AssetManager2.h
index a3b42df..1bde792 100644
--- a/libs/androidfw/include/androidfw/AssetManager2.h
+++ b/libs/androidfw/include/androidfw/AssetManager2.h
@@ -192,6 +192,12 @@
   std::unique_ptr<Asset> OpenNonAsset(const std::string& filename, ApkAssetsCookie cookie,
                                       Asset::AccessMode mode) const;
 
+  // Returns the resource id of parent style of the specified theme.
+  //
+  // Returns a null error if the name is missing/corrupt, or an I/O error if reading resource data
+  // failed.
+  base::expected<uint32_t, NullOrIOError> GetParentThemeResourceId(uint32_t resid) const;
+
   // Returns the resource name of the specified resource ID.
   //
   // Utf8 strings are preferred, and only if they are unavailable are the Utf16 variants populated.