convert a String of "uint8list" to a Unit8List

Question

I have a memory image stored in Sqllite converted to String with the toString() method, I want to convert it to Unit8List to display it inside a MemoryImage widget

Answer 1

codeUnits gets you a List<int>
Uint8List.fromList(...) converts List<int> to Uint8List
String.fromCharCodes(...) converts List<int> or Uint8List to String

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

Answer 2

Use utf8.encode(myString) to convert String to bytes or List<int>,

And then convert it back using utf8.decode(bytes)

String source = 'Błonie';

List<int> list = utf8.encode(source);
Uint8List bytes = Uint8List.fromList(list);
String outcome = utf8.decode(bytes);