How can I put a widget above another widget in Flutter?

Question

I would like to overlay a Round view on top of a background View just like in this screenshot below.

Answer 1

@override Widget build(BuildContext context) { // TODO: implement build return new Container(   width: 150.0,   height: 150.0,   child: new Stack(children: <Widget>[     new Container(       alignment: Alignment.center,       color: Colors.redAccent,       child: Text('Hello'),     ),     new Align(alignment: Alignment.bottomRight,       child: FloatingActionButton(         child: new Icon(Icons.add),           onPressed: (){}),     )   ],   ), ); }