CODE EXAMPLE FOR DART

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: 
        [
          //
        ],
      ),
    )));
  }