Flutter-在另一个类中进行修改时获取复选框反馈

如何解决Flutter-在另一个类中进行修改时获取复选框反馈

伙计们，我在另一个类中创建了一些复选框，以避免在修改它们时出现刷新，但我无法将其取回。有人能帮我吗？ 我将代码留在下面..

在我的主页上，我调用包含此类复选框的类..

我尝试了所有可能的方法，但无法在主页上获取复选框的值

**//here I call the click event on my main page**
TipoPagamento(
onChanged: (v) {
  setState(() {
   print(v);
  });
  }
),//**this is where i set up my checkbox.**
import 'package:flutter/material.dart';
class TipoPagamento extends StatefulWidget {
  @override
  _TipoPagamentoState createState() => _TipoPagamentoState();
  final ValueChanged<int> onChanged;
  const TipoPagamento({Key key,@required this.onChanged}) : super(key: key);
}
class _TipoPagamentoState extends State<TipoPagamento> {
  TextEditingController nameController = TextEditingController();
  int _radioValue = 0;
  @override
   _handleRadioValueChange(int value) {
    setState(() {
      _radioValue = value;
      switch (_radioValue) {
        case 1:
          break;
        case 2:
          break;
        case 3:
          break;
      }
    });
    return(_radioValue);
  }
  @override
  Widget build(BuildContext context) {
    return buildTextField();
  }
  Widget buildTextField() {
    return new Row(
      mainAxisAlignment: MainAxisAlignment.center,children: [
        new Radio(
          value: 1,groupValue: _radioValue,onChanged: _handleRadioValueChange,),new Text(
          'Débito',style: new TextStyle(fontSize: 16.0),new Radio(
          value: 2,new Text(
          'Crédito',style: new TextStyle(
            fontSize: 16.0,new Radio(
          value: 3,new Text(
          'Dinheiro',],);
  }
}

解决方法

您可以在下面复制粘贴运行完整代码
您可以在widget.onChanged(_radioValue);中致电_handleRadioValueChange
代码段

_handleRadioValueChange(int value) {
    setState(() {
      _radioValue = value;
      switch (_radioValue) {
        case 1:
          break;
        case 2:
          break;
        case 3:
          break;
      }
    });

    widget.onChanged(_radioValue);
    return (_radioValue);
  }

工作演示

工作演示的输出

I/flutter ( 6880): v 1
I/flutter ( 6880): v 2

完整代码

import 'package:flutter/material.dart';

class TipoPagamento extends StatefulWidget {
  @override
  _TipoPagamentoState createState() => _TipoPagamentoState();
  final ValueChanged<int> onChanged;
  const TipoPagamento({Key key,@required this.onChanged}) : super(key: key);
}

class _TipoPagamentoState extends State<TipoPagamento> {
  TextEditingController nameController = TextEditingController();
  int _radioValue = 0;

  _handleRadioValueChange(int value) {
    setState(() {
      _radioValue = value;
      switch (_radioValue) {
        case 1:
          break;
        case 2:
          break;
        case 3:
          break;
      }
    });

    widget.onChanged(_radioValue);
    return (_radioValue);
  }

  @override
  Widget build(BuildContext context) {
    return buildTextField();
  }

  Widget buildTextField() {
    return Row(
      mainAxisAlignment: MainAxisAlignment.center,children: [
        Radio(
          value: 1,groupValue: _radioValue,onChanged: _handleRadioValueChange,),Text(
          'Débito',style: TextStyle(fontSize: 16.0),Radio(
          value: 2,Text(
          'Crédito',style: TextStyle(
            fontSize: 16.0,Radio(
          value: 3,Text(
          'Dinheiro',],);
  }
}

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',theme: ThemeData(
        primarySwatch: Colors.blue,visualDensity: VisualDensity.adaptivePlatformDensity,home: MyHomePage(title: 'Flutter Demo Home Page'),);
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key,this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,children: <Widget>[
            TipoPagamento(onChanged: (v) {
              setState(() {
                print("v $v");
              });
            }),floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,tooltip: 'Increment',child: Icon(Icons.add),);
  }
}