Vertical viewport was given unbounded height error [duplicate]

Answer 1

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()));
    }

Answer 2

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()));
}