ExemploCustomScrollView

import 'package:flutter/material.dart';

class ExampleTwo extends StatefulWidget {
  ExampleTwo({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _ExampleTwoState createState() => new _ExampleTwoState();
}

class _ExampleTwoState extends State<ExampleTwo> {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      body: _buildMainContent(),
    );
  }

  _buildMainContent() {
    return CustomScrollView(
      slivers: <Widget>[
        SliverAppBar(
          pinned: true,
          leading: Container(), // Ocultando a seta de retorno para a página anterior
          expandedHeight: 180.0, // Altura máxima do Elemento
          flexibleSpace: FlexibleSpaceBar(
            background: Padding(
              padding: const EdgeInsets.only(top: 22.0),
              child: Column(
                children: <Widget>[
                  Padding(
                    padding: const EdgeInsets.symmetric(horizontal: 32.0, vertical: 12.0),
                    child: Row( // Primeira linha do Head que desaparecerá conforme o Scroll
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      children: <Widget>[
                        Text("Linha 1 Coluna 1"),
                        Text("Linha 1 Coluna 2"),
                      ],
                    ),
                  ),
                  Padding(
                    padding: const EdgeInsets.symmetric(horizontal: 32.0),
                    child: Row( // Segunda linha do Head que desaparecerá conforme o Scroll
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      children: <Widget>[
                        Text("Linha 2 Coluna 1"),
                        Text("Linha 2 Coluna 2"),
                      ],
                    ),
                  )
                ],
              ),
            ),
          ),
          bottom: PreferredSize( // Elemento que ficará fixo 
            preferredSize: const Size.fromHeight(44.0),
            child: Container(
              height: 100,
              color: Colors.white,
              child: Padding(
                padding: const EdgeInsets.symmetric(horizontal: 32.0),
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: <Widget>[
                    Text("Primeiro Item"),
                    Text("Segundo Item")
                  ],
                ),
              ),
            ),
          ),
        ),
        SliverList( // Área que comporta o ListView
          delegate: SliverChildListDelegate([
            _buildListItem(),
            _buildListItem(),
            _buildListItem(),
            _buildListItem(),
            _buildListItem(),
            _buildListItem(),
          ]),
        )
      ],

    );
  }

  Widget _buildListItem() { // Método para criar a ListView
    return Column(
      children: <Widget>[
        Padding(
          padding: EdgeInsets.only(top: 16.0, left: 16.0, right: 16.0),
          child: Align( // Cabeçalho de cada ListView
            alignment: Alignment.center,
            child: Text(
              'List header',
              style: Theme.of(context).textTheme.body2,
            ),
          ),
        ),
        ListView.builder( // ListView Propriamente dito
          padding: EdgeInsets.only(top: 8.0),
          itemBuilder: (context, index) {
            return Padding(
              padding: EdgeInsets.symmetric(
                horizontal: 16.0,
                vertical: 8.0,
              ),
              child: Text(
                'Nested list item $index',
                style: Theme.of(context).textTheme.body1,
              ),
            );
          },
          itemCount: 8,
          shrinkWrap: true,
          physics: ClampingScrollPhysics(), // Propriedade responsável por "ativar o Scroll na ListView"
        ),
      ],
    );
  }
}