如何随机改变rgb颜色？

Question

在应用程序中，当您点击屏幕时，需要将颜色更改为随机，但必须是RGB格式。如何获得随机的 RGB 颜色？

class _HomePageState extends State<HomePage> {
  Color _color = Colors.white;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Color picker"),
        centerTitle: true,
      ),
      body: GestureDetector(
        onTap: () {
          setState(() {
            _color = ...
          });
        },
        child: Container(
          color: _color,
          padding: const EdgeInsets.all(20),
        ),
      ),
    );
  }
}

Answer 1

你可以这样做

class _HomePageState extends State<HomePage> {
    
       Random random = Random();
  Color _color = Colors.white;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Color picker"),
        centerTitle: true,
      ),
      body: GestureDetector(
        onTap: () {
          setState(() {
            _color = Color.fromRGBO(
              random.nextInt(255),
              random.nextInt(255),
              random.nextInt(255),
              1,
            );
          });
        },
        child: Container(
          color: _color,
          padding: const EdgeInsets.all(20),
        ),
      ),
    );
  }
}