Can't create ExpansionPanelList with Items in Flutter

user_8308081 0
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I'm new to Flutter so i am trying to get into it. But I'm hanging on creating an ExpansionPanelList with ExpansionPanels in it. And Like the title says all created in googles Flutter.

My code so far:

import 'package:flutter/material.dart';


class ShoppingBasket extends StatefulWidget {
  @override
  ShoppingBasketState createState() => new ShoppingBasketState();
}

class ShoppingBasketState extends State<ShoppingBasket> {

  @override
  Widget build(BuildContext context) {
    return new ExpansionPanelList(
      children: <ExpansionPanel>[
        new ExpansionPanel(
          headerBuilder: _headerBuilder,
          body: new Container(
            child: new Text("body"),
          ),
        )
      ],
    );
  }


  Widget _headerBuilder(BuildContext context, bool isExpanded) {
    return new Text("headerBuilder");
  }
}

But when I open the app the debugger says:

Another exception was thrown: 'package:flutter/src/rendering/box.dart': Failed assertion: line 1430 pos 12: 'hasSize': is not true.

flutter panel android
2 Answers

There is another way to implement same user experience that is using ExpansionTile inside a ListView

         ListView(
              shrinkWrap: true,
              children: <Widget>[
                ExpansionTile(
                  leading: Icon(Icons.event),                         
                  title: Text('Test1'),
                  children: <Widget>[
                    ListTile(title: Text('Title of the item')),
                    ListTile(
                      title: Text('Title of the item2'),
                    )
                  ],
                ),
                ExpansionTile(
                  title: Text('Test2'),
                  children: <Widget>[
                    ListTile(title: Text('Title of the item')),
                    ListTile(
                      title: Text('Title of the item2'),
                    )
                  ],
                )
              ],
            )
user_38111620
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