actually I want to convert a list of decimal to a list of hexadicimal. I tried .toRadixString(16) But I got : The method 'toRadixString' isn't defined for the type 'List'.. this is my code:

  BehaviorSubject<List<int>> _value;
  Stream<List<int>> get value => Rx.merge([
        _value.stream,
        _onValueChangedStream,
      ]);

  List<int> get lastValue => _value.value ?? [];
 Future<Null> write(List<int> value, {bool withoutResponse = false}) async {
    final type = withoutResponse
        ? CharacteristicWriteType.withoutResponse
        : CharacteristicWriteType.withResponse;
    var request = protos.WriteCharacteristicRequest.create()
      ..remoteId = deviceId.toString()
      ..characteristicUuid = uuid.toString()
      ..serviceUuid = serviceUuid.toString()
      ..writeType =
          protos.WriteCharacteristicRequest_WriteType.valueOf(type.index)!
      ..value = value.map((e) => e.toRadixString(16)).toList();

    // Uint8List(4)..buffer.asInt32List()[0]=value;

    //..value = value.toRadixString(16);

I would be very thankful if you can give me a solution for converting this list from decimal or int to hexadicimal.

[1]: https://i.stack.imgur.com/MVOkQ.png

CodePudding user response：

You are trying to use toRadixString on list.

as on https://api.flutter.dev/flutter/dart-core/int/toRadixString.html:

Converts this to a string representation in the given radix.

as in documentation you should use toRadixString on int.

in your case you can try this:

  List get hexLastValue => _value.value.map((e) => e.toRadixString(16)).toList();

CodePudding user response：

The protos.WriteCharacteristicRequest.create()..value requires List<int> so you cant able to convert the hexa decimal string to int data type required by the protos.WriteCharacteristicRequest