似乎没有一种不滥用ExpansionPanel小部件或做自己的事情的本地方法。我的解决方案是使用expandable库，因为基本上这是您自己做的事情。

这是我的代码。调整并做您想做的就足够了。

import 'package:expandable/expandable.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    theme: ThemeData(accentColor: Colors.black87),home: ListExpansion(),));
}

List<String> generateItems(int numberOfItems) {
  return List.generate(numberOfItems,(int index) {
    return 'Item $index';
  });
}

class ListExpansion extends StatefulWidget {
  @override
  _ListExpansionState createState() => _ListExpansionState();
}

class _ListExpansionState extends State<ListExpansion> {
  ExpandableController _controller;
  List<String> _data = generateItems(8);

  @override
  void initState() {
    super.initState();
    _controller = ExpandableController();
  }

  @override
  void dispose() {
    super.dispose();
    _controller.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text("List Expansion"),actions: <Widget>[
            IconButton(
              tooltip: _controller.expanded ? "Collapse" : "Expand",icon: _controller.expanded ? Icon(Icons.expand_less) : Icon(Icons.expand_more),onPressed: () {
                setState(() {
                  _controller.toggle();
                });
              },),],body: ExpandablePanel(
          controller: _controller,hasIcon: false,tapHeaderToExpand: false,tapBodyToCollapse: false,collapsed: ListTile(
            title: Text("I am currently collapsed. Tap the button to expand me and see a list"),expanded: ListView.builder(
            itemCount: _data.length,itemBuilder: (BuildContext context,int index) {
              return ListTile(
                title: Text(_data[index]),);
            },);
  }
}

确保像这样添加发布依赖项：

dependencies:
  flutter:
    sdk: flutter

  expandable: ^3.0.1

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.2