设置背景图还是挺简单的，直接container里加个decration然后加个图片就行了，就像这样

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Container(
            decoration: BoxDecoration(
          image: DecorationImage(
            image: NetworkImage(
                'https://img.zcool.cn/community/0372d195ac1cd55a8012062e3b16810.jpg'),
            fit: BoxFit.cover,
          ),
        )));
  }
}

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