Dart 将“String“与“ uint8list”互转

Uint8List.fromList（…）将 List< int> 转换为 Uint8List

String.fromCharCodes（…）转换 List< int> 或 Uint8List 到 String

List<int> list = 'xxx'.codeUnits;
Uint8List bytes = Uint8List.fromList(list);
String string = String.fromCharCodes(bytes);