hexColor static method
Generates a random color as a hex string, e.g. '#AABBCC'.
Implementation
static String hexColor({bool withAlpha = false}) {
final rand = math.Random();
int value = withAlpha ? rand.nextInt(0x100000000) : rand.nextInt(0x1000000);
return withAlpha
? '#${value.toRadixString(16).padLeft(8, '0').toUpperCase()}'
: '#${value.toRadixString(16).padLeft(6, '0').toUpperCase()}';
}