searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {


                mAdapter.getFilter().filter(newText);

                if ( mAdapter != null && mAdapter.getItemCount() > 0 && recyclerView_search.getVisibility() == View.GONE) {
                    recyclerView_search.setVisibility(View.VISIBLE);
                }else {
                    recyclerView_search.setVisibility(View.GONE);
                }

                return false;
            }
        });

@Override
    public void onFilterComplete(int i) {
        if (i > 0) {
            recyclerView_search.setVisibility(View.VISIBLE);
        } else {
            recyclerView_search.setVisibility(View.GONE);
        }
    }