在Flutter中为传递给函数的颜色随机化样本

Question

有可能吗？如有任何建议或帮助，将不胜感激。提前谢谢你。

Answer 1

您只能随机设置“加色”列表：

飘动的色彩

List<int> types = [50, 100, 200, 300, 400, 600, 700, 800, 900]

并随机化0..8之间的一个数字

int get getRandomNumber => 0 + Random().nextInt(8 - 0);

Color? selectedColor = Colors.amber[types[getRandomNumber]];

extension HexColor on Color {
  /// String is in the format "aabbcc" or "ffaabbcc" with an optional leading "#".
  Color fromHex(String hexString) {
    final buffer = StringBuffer();
    if (hexString.length == 6 || hexString.length == 7) buffer.write('ff');
    buffer.write(hexString.replaceFirst('#', ''));
    return Color(int.parse(buffer.toString(), radix: 16));
  }

  /// Prefixes a hash sign if [leadingHashSign] is set to `true` (default is `true`).
  String toHex({bool leadingHashSign = true}) => '${leadingHashSign ? '#' : ''}'
      '${alpha.toRadixString(16).padLeft(2, '0')}'
      '${red.toRadixString(16).padLeft(2, '0')}'
      '${green.toRadixString(16).padLeft(2, '0')}'
      '${blue.toRadixString(16).padLeft(2, '0')}';
}

Color getRandomColor(String selectedColor) {
  final List<int> types = [50, 100, 200, 300, 400, 600, 700, 800, 900];
  int getRandomNumber = 0 + Random().nextInt(8 - 0);
  return Color.fromHex(selectedColor)[types[getRandomNumber]];
}

//true will return "#ffffff", false will return "ffffff"
Color _color = getRandomColor(Color.red.toHex(true));