error: The argument type '(int) → dynamic' can't be assigned to the parameter type '(String) → void'

问题

I have some fields which post String and int, the String fields are working properly and I am getting these values at the db, the at the int type fields I'm getting this error message.

The argument type '(int) → dynamic' can't be assigned to the parameter type '(String) → void'.

I'm using bloc to post to a firebase db.

here is how it looks.

Widget build(BuildContext context) {
    final trackerBloc = Provider.of<TrackerBloc>(context);
    String docId = DateTime.now().millisecondsSinceEpoch.toString();

    return Scaffold(
      appBar: AppBar(
        title: Text('Create'),
      ),
      body: SingleChildScrollView(
        child: Padding(
          padding: EdgeInsets.all(20.0),
          child: Column(
            children: <Widget>[
              Padding(
                padding: EdgeInsets.all(20.0),
                child: Text(
                  'Create',
                  style: TextStyle(fontSize: 20.0),
                ),
              ),
              _buildNumberField(trackerBloc),
 ...

the textField itself looks like this:

  Widget _buildNumberField(TrackerBloc trackerBloc) {
    return StreamBuilder<Object>(
      stream: trackerBloc.numberStream,
      builder: (context, snapshot) {
        return TextField(
          controller: _controllerNumber,
          onChanged: trackerBloc.numberSink, /// <- The argument type '(int) → dynamic' can't be assigned to the parameter type '(String) → void'.
          decoration: InputDecoration(
              labelText: 'Equipment Number', errorText: snapshot.error),
        );
      },
    );
  }

The bloc Future to create the data looks like this. here I'm already getting null value from the numberField

  Future<void> createData(docId) {

    final Tracker createTracker = Tracker(
        id: docId,
        comment: _commentController.value,
        exercise: _exerciseController.value,
        number: _numberController.value,
        repetition: _repetitionController.value,
        sets: _setsController.value,
        weight: _weightController.value
    );

    print(_commentController.value + _numberController.value.toString());

    return trackerDb.createData(docId, createTracker);
  }

The stream and Sink looks like this

final _numberController = BehaviorSubject<int>();

Stream<int> get numberStream => _numberController.stream.transform(validateNumbers);
Function(int) get numberSink => _numberController.sink.add;


// the vallidation process
Stream<bool> get submitValid => Observable.combineLatest6(commentStream, exerciseStream, numberStream, repStream, setsStream, weightStream, (e, m, p, q, r, t,) => true);

final validateNumbers = StreamTransformer<int, int>.fromHandlers(handleData: (numbers, sink){
  if(numbers > 1) {
    sink.add(numbers);
  } else {
    sink.addError('add at least something man');
  }

});

回答1:

Try with:

 onChanged: (strNum) => trackerBloc.setsSink((int.parse(strNum))),

来源：https://stackoverflow.com/questions/56898595/error-the-argument-type-int-%e2%86%92-dynamic-cant-be-assigned-to-the-parameter-ty

标签

Flutter

parameters

textfield

bloc