Flutter 全屏背景图(包括 Appbar 和 状态栏）

class _HomePageState extends State<HomePage>{
  @override
  Widget build(BuildContext context) {
    // 获取屏幕宽高
    final size = MediaQuery.of(context).size;
    final width = size.width;
    final height = size.height;

    return Container(
       width,
      height: height,
      decoration: BoxDecoration(
        image: DecorationImage(
          image: NetworkImage('https://m.airchina.com.cn:9062/fu/yx/20200804/5bcecdbba76d41f19d5913aa7684469a.jpg'),
          fit: BoxFit.cover,
        ),
      ),
      child: Scaffold(
        backgroundColor: Colors.transparent,
        appBar: AppBar(
          elevation: 0,
          backgroundColor: Colors.transparent,
        ),
        body: Container(
           width,
          child: Text('hello'),
        ),
      ),
    );
  }
}