lib-manipulation/src/main/java/com/nhaarman/listviewanimations/itemmanipulation/animateaddition/InsertQueue.java
@NonNull
    public Collection<Integer> getActiveIndexes() {
        Collection<Integer> result = new HashSet<>();
        for (AtomicInteger i : mActiveIndexes) {
            result.add(i.get());
        }
        return result;
    }
@NonNull
    public Collection<Integer> getActiveIndexes() {
        Collection<Integer> result = new HashSet<>();
        for (AtomicInteger i : mActiveIndexes) {
            result.add(i.get());
        }
        return result;
    }
Returns a collection of currently active indexes.