DART

add bg image to scaffold flutter

@override
Widget build(BuildContext context) {
  return new Scaffold(
    body: new Stack(
      children: <Widget>[
        new Container(
          decoration: new BoxDecoration(
            image: new DecorationImage(image: new AssetImage("images/background.jpg"), fit: BoxFit.cover,),
          ),
        ),
        new Center(
          child: new Text("Hello background"),
        )
      ],
    )
  );
}

scaffold background image flutter

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: SingleChildScrollView(
            child: Container(
      decoration: const BoxDecoration(
        image: DecorationImage(
            image: AssetImage('assets/bgmain.jpg'),
            //fit: BoxFit.cover 
            fit: BoxFit.fill),
      ),
      child: Column(
        children: 
        [
          //
        ],
      ),
    )));
  }

Scaffold image background flutter

@override
  Widget build(BuildContext context){
    return Scaffold(
      body: Container(
        decoration: BoxDecoration(
          image: DecorationImage(
            image: AssetImage("assets/images/background.jpg"),
            fit: BoxFit.cover,
          ),
        ),
        child: Text("Hello World!"),
      ),
    );
  }