Vertical viewport was given unbounded height error [duplicate]

Question

 @override  Widget build(BuildContext context) {    return Column(      children: <Widget>[        new Text("Some text"),        ListView()      ],    );  }   Widget ListView() {    return ListView(      padding: EdgeInsets.symmetric(vertical: 8.0),      children: Item(),    );  }   List<Item> Item() {    return list      .map((item) => Item(text: item))      .toList();  }   class Item extends ListTile {    Item({String text, GestureTapCallback onTap})     : super(subtitle: Column(children: <Widget>[         Text(text),       ]));  } 

A blank space appears on the screen and the console says:

Vertical viewport was given unbounded height. Viewports expand in the scrolling direction to fill their container.

Answer 1

Wrapping ListView inside Flexible will make it work.

Widget ListView() { return new Flexible(child: new ListView(     padding: new EdgeInsets.symmetric(vertical: 8.0),     children: Item())); } 

Answer 2

The best solution is to use Flexible, but if you want to give it an exact height you should use Container like this:

    Widget ListView() {     return Container(        height:100.0,        child: ListView(         padding: new EdgeInsets.symmetric(vertical: 8.0),         children: Item()));     }