ron-k

        public static class MultiDataCombiner<X, Y> {
            private final LiveData<Pair<X, Y>> ldXY;

            public static <X, Y> MultiDataCombiner<X, Y> create(LiveData<X> ldX, LiveData<Y> ldY) {
                return new MultiDataCombiner<>(ldX, ldY);
            }

            private MultiDataCombiner(LiveData<X> ldX, LiveData<Y> ldY) {
                ldXY = combine2(ldX, ldY, x -> y -> new Pair<>(x, y));
            }