CODE EXAMPLE FOR DART

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!"),
      ),
    );
  }