diff --git a/src/org/geometerplus/android/fbreader/libraryService/BookCollectionShadow.java b/src/org/geometerplus/android/fbreader/libraryService/BookCollectionShadow.java
index 31e9c2c63..2b7327336 100644
--- a/src/org/geometerplus/android/fbreader/libraryService/BookCollectionShadow.java
+++ b/src/org/geometerplus/android/fbreader/libraryService/BookCollectionShadow.java
@@ -56,6 +56,14 @@ public class BookCollectionShadow implements IBookCollection, ServiceConnection
 		}
 	}
 
+	public void addListener(Listener listener) {
+		// TODO: implement
+	}
+
+	public void removeListener(Listener listener) {
+		// TODO: implement
+	}
+
 	public synchronized int size() {
 		if (myInterface == null) {
 			return 0;
diff --git a/src/org/geometerplus/fbreader/library/BookCollection.java b/src/org/geometerplus/fbreader/library/BookCollection.java
index e6e4f78aa..3e6c6f0af 100644
--- a/src/org/geometerplus/fbreader/library/BookCollection.java
+++ b/src/org/geometerplus/fbreader/library/BookCollection.java
@@ -31,25 +31,6 @@ import org.geometerplus.fbreader.bookmodel.BookReadingException;
 public class BookCollection implements IBookCollection {
 	private final List<Listener> myListeners = Collections.synchronizedList(new LinkedList<Listener>());
 
-	public interface Listener {
-		public enum BookEvent {
-			Added,
-			Updated,
-			Removed
-		}
-
-		public enum BuildEvent {
-			Started,
-			NotStarted,
-			Succeeded,
-			Failed,
-			Completed
-		}
-
-		void onBookEvent(BookEvent event, Book book);
-		void onBuildEvent(BuildEvent event);
-	}
-
 	public void addListener(Listener listener) {
 		myListeners.add(listener);
 	}
diff --git a/src/org/geometerplus/fbreader/library/IBookCollection.java b/src/org/geometerplus/fbreader/library/IBookCollection.java
index 613a9f239..59fd7ae22 100644
--- a/src/org/geometerplus/fbreader/library/IBookCollection.java
+++ b/src/org/geometerplus/fbreader/library/IBookCollection.java
@@ -22,6 +22,28 @@ package org.geometerplus.fbreader.library;
 import java.util.List;
 
 public interface IBookCollection {
+	public interface Listener {
+		public enum BookEvent {
+			Added,
+			Updated,
+			Removed
+		}
+
+		public enum BuildEvent {
+			Started,
+			NotStarted,
+			Succeeded,
+			Failed,
+			Completed
+		}
+
+		void onBookEvent(BookEvent event, Book book);
+		void onBuildEvent(BuildEvent event);
+	}
+
+	public void addListener(Listener listener);
+	public void removeListener(Listener listener);
+
 	int size();
 	List<Book> books(String pattern);
 	List<Book> recentBooks();
diff --git a/src/org/geometerplus/fbreader/library/Library.java b/src/org/geometerplus/fbreader/library/Library.java
index b0a8975a1..ef655756f 100644
--- a/src/org/geometerplus/fbreader/library/Library.java
+++ b/src/org/geometerplus/fbreader/library/Library.java
@@ -70,7 +70,7 @@ public final class Library {
 	public static final int REMOVE_FROM_DISK = 0x02;
 	public static final int REMOVE_FROM_LIBRARY_AND_DISK = REMOVE_FROM_LIBRARY | REMOVE_FROM_DISK;
 
-	private final BookCollection myCollection;
+	private final IBookCollection myCollection;
 
 	private final RootTree myRootTree = new RootTree();
 	private boolean myDoGroupTitlesByFirstLetter;