Flutter：更改APP背景顏色

How do I set the background color of my main screen in Flutter?

三種方法：

1.Using backgroundColor

Scaffold(
  backgroundColor: Colors.black,
  body: Center(...),
)

2.Using Container in SizedBox.expand

Scaffold(
  body: SizedBox.expand(
    child: Container(
      color: Colors.black,
      child: Center(...)
    ),
  ),
)

3.Using Theme

Theme(
  data: Theme.of(context).copyWith(scaffoldBackgroundColor: Colors.black),
  child: Scaffold(
    body: Center(...),
  ),
)