Flutter - How to center widget inside list view

Vertically Center & Horizontal Center:

Scaffold(
  appBar: new AppBar(),
  body: Center(
    child: new ListView(
      shrinkWrap: true,
        padding: const EdgeInsets.all(20.0),
        children: [
          Center(child: new Text('ABC'))
        ]
    ),
  ),
);


Only Vertical Center:
Scaffold(
  appBar: new AppBar(),
  body: Center(
    child: new ListView(
      shrinkWrap: true,
        padding: const EdgeInsets.all(20.0),
        children: [
          new Text('ABC')
        ]
    ),
  ),
);