VideoGroupObjectAdapter: fix ArrayIndexOutOfBoundsException

Author: yuliskov

smarttubetv/src/main/java/com/liskovsoft/smartyoutubetv2/tv/adapter/VideoGroupObjectAdapter.java

@@ -11,11 +11,13 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
 
 public class VideoGroupObjectAdapter extends ObjectAdapter {
     private static final WeakHashSet<VideoGroupObjectAdapter> sAdapterRegistry = new WeakHashSet<>();
     private final List<Video> mVideoItems = new ArrayList<>();
-    private final List<VideoGroup> mVideoGroups = new ArrayList<>(); // keep groups from being garbage collected
+    // CopyOnWriteArrayList to fix Fatal Exception: java.lang.ArrayIndexOutOfBoundsException: length=10; index=-1
+    private final List<VideoGroup> mVideoGroups = new CopyOnWriteArrayList<>(); // keep groups from being garbage collected
     private static final int TYPE_ADD = 0;
     private static final int TYPE_REMOVE = 1;
     private static final int TYPE_SYNC = 2;