вы можете использовать виджет стека для этого. Следуйте приведенному ниже примеру.
import 'package:flutter/material.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context)
{
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
),
home: new Home(),
builder: (BuildContext context,Widget child){
return Padding(
child: child,
padding: EdgeInsets.only(bottom: 50.0),
);
},
);
}
}
class Home extends StatefulWidget {
@override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home> {
@override
Widget build(BuildContext context) {
return Stack(
children: <Widget>[
new Container(
height: double.infinity,
width: double.infinity,
decoration:new BoxDecoration(
image: new DecorationImage(
image: new AssetImage("images/jocker.jpg"),
fit: BoxFit.cover,
),
),
),
Scaffold(
backgroundColor: Colors.transparent,
appBar: new AppBar(
title: new Text("csd"),
backgroundColor: Colors.transparent,
elevation: 0.0,
),
body: new Container(
color: Colors.transparent,
),
),
],
);
}
}