Atualizar lista de contatos

Prezados, eu ja lê o forum inteiro e a maioria das resposta informa para converter a contact_list de StatelessWidget para StatefulWidget. Porem eu ja realizei esta conversão mas o erro de não atualizar a lista de contatos logo apos o save no formulario ainda persiste.

Alguem conseguiu resolver este problema ?

Segue os codigos abaixo

ContactsList

class ContactsList extends StatefulWidget {

  @override
  _ContactsListState createState() => _ContactsListState();
}

class _ContactsListState extends State<ContactsList> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Contacts'),
      ),
      body: FutureBuilder<List<Contact>>(
        initialData: List(),
        future: findAll(),
        builder: (context, snapshot) {
          switch(snapshot.connectionState){
            case ConnectionState.none:
              break;
            case ConnectionState.waiting:
              return Center(
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  crossAxisAlignment: CrossAxisAlignment.center,
                  children: <Widget>[
                    CircularProgressIndicator(),
                    Text('Loading')
                  ],
                ),
              );
              break;
            case ConnectionState.active:
              break;
            case ConnectionState.done:
              final List<Contact> contacts = snapshot.data;
              return ListView.builder(
                itemBuilder: (context, index) {
                  final Contact contact = contacts[index];
                  return _ContactItem(contact);
                },
                itemCount: contacts.length,
              );
              break;
          }
          return Text('Unknown error');
        },
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          Navigator.of(context)
              .push(
            MaterialPageRoute(
              builder: (context) => ContactForm(),
            ),
          );
        },
        child: Icon(
          Icons.add,
        ),
      ),
    );
  }
}

class _ContactItem extends StatelessWidget {
  final Contact contact;

  _ContactItem(this.contact);

  @override
  Widget build(BuildContext context) {
    return Card(
      child: ListTile(
        title: Text(
          contact.name,
          style: TextStyle(
            fontSize: 24.0,
          ),
        ),
        subtitle: Text(
          contact.accountNumber.toString(),
          style: TextStyle(
            fontSize: 16.0,
          ),
        ),
      ),
    );
  }
}

ContactForm

class ContactForm extends StatefulWidget {
  @override
  _ContactFormState createState() => _ContactFormState();
}

class _ContactFormState extends State<ContactForm> {
  final TextEditingController _nameController = TextEditingController();

  final TextEditingController _accountNumberController =
      TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('New contact'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          children: <Widget>[
            TextField(
              controller: _nameController,
              decoration: InputDecoration(
                labelText: 'Full name',
              ),
              style: TextStyle(
                fontSize: 24.0,
              ),
            ),
            Padding(
              padding: const EdgeInsets.only(top: 8.0),
              child: TextField(
                controller: _accountNumberController,
                decoration: InputDecoration(
                  labelText: 'Account number',
                ),
                style: TextStyle(
                  fontSize: 24.0,
                ),
                keyboardType: TextInputType.number, // teclado numerico
              ),
            ),
            Padding(
              padding: const EdgeInsets.only(top: 16.0),
              child: SizedBox(
                width: double.maxFinite,
                child: RaisedButton(
                  child: Text('Create'),
                  onPressed: () {
                    final String name = _nameController.text;
                    final int accountNumber =
                        int.tryParse(_accountNumberController.text);

                    final Contact newContact = Contact(0, name, accountNumber);
                    save(newContact).then((id) => Navigator.pop(context));
                  },
                ),
              ),
            )
          ],
        ),
      ),
    );
  }
}