In the next version of Android, Google made ART primary and only runtime. This may introduce some issues for this library. There are few incorrectly overriden methods
W/dalvikvm﹕ method Lcom/etsy/android/grid/ExtendableListView;.fillGap incorrectly overrides package-private method with same name in Landroid/widget/AbsListView;
W/dalvikvm﹕ method Lcom/etsy/android/grid/ExtendableListView;.getFooterViewsCount incorrectly overrides package-private method with same name in Landroid/widget/AbsListView;
W/dalvikvm﹕ method Lcom/etsy/android/grid/ExtendableListView;.getHeaderViewsCount incorrectly overrides package-private method with same name in Landroid/widget/AbsListView;
W/dalvikvm﹕ method Lcom/etsy/android/grid/ExtendableListView;.invokeOnItemScrollListener incorrectly overrides package-private method with same name in Landroid/widget/AbsListView;
W/dalvikvm﹕ method Lcom/etsy/android/grid/ExtendableListView;.rememberSyncState incorrectly overrides package-private method with same name in Landroid/widget/AdapterView;
In the next version of Android, Google made ART primary and only runtime. This may introduce some issues for this library. There are few incorrectly overriden methods
W/dalvikvm﹕ method Lcom/etsy/android/grid/ExtendableListView;.fillGap incorrectly overrides package-private method with same name in Landroid/widget/AbsListView; W/dalvikvm﹕ method Lcom/etsy/android/grid/ExtendableListView;.getFooterViewsCount incorrectly overrides package-private method with same name in Landroid/widget/AbsListView; W/dalvikvm﹕ method Lcom/etsy/android/grid/ExtendableListView;.getHeaderViewsCount incorrectly overrides package-private method with same name in Landroid/widget/AbsListView; W/dalvikvm﹕ method Lcom/etsy/android/grid/ExtendableListView;.invokeOnItemScrollListener incorrectly overrides package-private method with same name in Landroid/widget/AbsListView; W/dalvikvm﹕ method Lcom/etsy/android/grid/ExtendableListView;.rememberSyncState incorrectly overrides package-private method with same name in Landroid/widget/AdapterView;
http://developer.android.com/guide/practices/verifying-apps-art.html#Object_Model_Changes