FilipeLipan

        mRecyclerView = (RecyclerView) findViewById(R.id.rv);

        list = generateData();
        adapter = new ExpandableItemAdapter(list);

        final GridLayoutManager manager = new GridLayoutManager(this, 3);
        manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                return adapter.getItemViewType(position) == ExpandableItemAdapter.TYPE_PERSON ? 1 : manager.getSpanCount();