这是我使用的代码：
class Criterias extends StatefulWidget { CriteriaState createState() => new CriteriaState();}class NewItem { bool isExpanded; final String header; final Widget body; final Icon iconpic; NewItem(this.isExpanded, this.header, this.body, this.iconpic);}double discretevalue = 2.0;double hospitaldiscretevalue = 25.0;class CriteriaState extends State<Criterias> { List<NewItem> items = <NewItem>[ new NewItem( false, 'Schools', new Padding( padding: new EdgeInsets.all(20.0), child: new Column( children: <Widget>[ //put the children here ]) ),new Icon(Icons.add)), //give all your items here ]; ListView List_Criteria; Widget build(BuildContext context) { List_Criteria = new ListView( children: [ new Padding( padding: new EdgeInsets.all(10.0), child: new ExpansionPanelList( expansionCallback: (int index, bool isExpanded) { setState(() { items[index].isExpanded = !items[index].isExpanded; }); }, children: items.map((NewItem item) { return new ExpansionPanel( headerBuilder: (BuildContext context, bool isExpanded) { return new ListTile(leading: item.iconpic,title: new Text( item.header, textAlign: TextAlign.left, style: new TextStyle( fontSize: 20.0, fontWeight: FontWeight.w400, ),)); }, isExpanded: item.isExpanded, body: item.body, ); }).toList(), ), ) ], ); Scaffold scaffold = new Scaffold( appBar: new AppBar( title: new Text("Criteria Selection"), ), body: List_Criteria, persistentFooterButtons: <Widget>[ new ButtonBar(children: <Widget>[ new FlatButton( color: Colors.blue, onPressed: null, child: new Text( 'Apply', textAlign: TextAlign.left, style: new TextStyle(fontWeight: FontWeight.bold), ), ) ]) ], ); return scaffold; }}
