Intent - Truyền mảng qua màn hình khác

Main.class : 

Intent intent = new Intent(getApplicationContext(),TrangDanhSachSanPhamTrongDanhMuc.class);
Gson gson = new Gson();
String mangpopup = gson.toJson(mangDanhMuc);
intent.putExtra("mangDanhMuc",mangpopup);
startActivity(intent);

TrangDanhSachSanPhamTrongDanhMuc.class : 


// lấy mảng danh mụcString ListString = this.getIntent().getStringExtra("mangDanhMuc");
if(ListString!=null){
    Gson gson = new Gson();
    Type type = new TypeToken<List<DanhMucSanPham>>(){}.getType();
    danhMucPopup = gson.fromJson(ListString, type);
}