Answers for "flutter radio button"

flutter radio button with text

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Nicesnippets',
      theme: ThemeData(
        primarySwatch: Colors.red,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Welcome to Nicesnippets'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;
  State createState() => State();
}



class _State extends State   {
  TextEditingController nameController = TextEditingController();
  int _radioValue = 0;

  void _handleRadioValueChange(int value) {
    setState(() {
      _radioValue = value;

      switch (_radioValue) {
        case 0:
          break;
        case 1:
          break;
        case 2:
          break;
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar (
          title: Text('Welcome to Nicesnippets'),
        ),
        body: Padding(

            padding: EdgeInsets.all(10),

            child: ListView(
              children: [
                Container(
                    alignment: Alignment.center,
                    padding:EdgeInsets.all(10), 
                    margin: const EdgeInsets.only(top: 50),
                    child: Text(
                      'Radio Button',
                      style: TextStyle(
                          color: Colors.red,
                          fontWeight: FontWeight.w500,
                          fontSize: 30),
                    )),
                new Row(
                  mainAxisAlignment: MainAxisAlignment.center,
: MainAxisAlignment.center,
                  children: [
                    new Radio ( 
                      value: 0,
                      groupValue: _radioValue,
: _radioValue ,
                      onChanged: _handleRadioValueChange ,
                    ),
                    new Text(
                      'First',
                      style: new TextStyle(fontSize: 16.0),
                    ),
),
                    new Radio(
new Radio ( 
                      value: 1,
                      groupValue: _radioValue,
: _radioValue ,
                      onChanged: _handleRadioValueChange,
: _handleRadioValueChange ,
                    ),
),
                    new Text(
new Text(
                      'Second',
                      style: new TextStyle(
                        fontSize: 16.0,
                      ),
                    ),
),
                    new Radio(
new Radio ( 
                      value: 2,
                      groupValue: _radioValue,
: _radioValue ,
                      onChanged: _handleRadioValueChange,
: _handleRadioValueChange ,
                    ),
),
                    new Text(
newText( 
                      'Last',
                      style: new TextStyle(fontSize: 16.0),
:newTextStyle(fontSize:16.0),   
                    ),
),
                  ],
                ),
                Container(
                    height: 50,
                    padding: EdgeInsets.fromLTRB(10, 0, 10, 0),
                    child: RaisedButton(
                      textColor: Colors.white,
                      color: Colors.red,
                      child: Text('Button'),
                      onPressed: () {
                        print(nameController.text);
                      },
                    )),
              ],
            )));
  }


}

radio button validation in flutter

This package helps in creation of Flutter Forms by providing the syntactic sugar for creating a Form Widget and reduce the boilerplate needed to build a form, validate fields, react to changes, and collect the value of the Form

flutter radio button

enum SingingCharacter { lafayette, jefferson }

// ...

SingingCharacter? _character = SingingCharacter.lafayette;

@override
Widget build(BuildContext context) {
  return Column(
    children: <Widget>[
      ListTile(
        title: const Text('Lafayette'),
        leading: Radio<SingingCharacter>(
          value: SingingCharacter.lafayette,
          groupValue: _character,
          onChanged: (SingingCharacter? value) {
            setState(() { _character = value; });
          },
        ),
      ),
      ListTile(
        title: const Text('Thomas Jefferson'),
        leading: Radio<SingingCharacter>(
          value: SingingCharacter.jefferson,
          groupValue: _character,
          onChanged: (SingingCharacter? value) {
            setState(() { _character = value; });
          },
        ),
      ),
    ],
  );
}

custom radio button flutter

class CustomRadio extends StatefulWidget {
  @override
  createState() {
    return new CustomRadioState();
  }
}

class CustomRadioState extends State<CustomRadio> {
  List<RadioModel> sampleData = new List<RadioModel>();

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    sampleData.add(new RadioModel(false, 'A', 'April 18'));
    sampleData.add(new RadioModel(false, 'B', 'April 17'));
    sampleData.add(new RadioModel(false, 'C', 'April 16'));
    sampleData.add(new RadioModel(false, 'D', 'April 15'));
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text("ListItem"),
      ),
      body: new ListView.builder(
        itemCount: sampleData.length,
        itemBuilder: (BuildContext context, int index) {
          return new InkWell(
            //highlightColor: Colors.red,
            splashColor: Colors.blueAccent,
            onTap: () {
              setState(() {
                sampleData.forEach((element) => element.isSelected = false);
                sampleData[index].isSelected = true;
              });
            },
            child: new RadioItem(sampleData[index]),
          );
        },
      ),
    );
  }
}

class RadioItem extends StatelessWidget {
  final RadioModel _item;
  RadioItem(this._item);
  @override
  Widget build(BuildContext context) {
    return new Container(
      margin: new EdgeInsets.all(15.0),
      child: new Row(
        mainAxisSize: MainAxisSize.max,
        children: <Widget>[
          new Container(
            height: 50.0,
            width: 50.0,
            child: new Center(
              child: new Text(_item.buttonText,
                  style: new TextStyle(
                      color:
                          _item.isSelected ? Colors.white : Colors.black,
                      //fontWeight: FontWeight.bold,
                      fontSize: 18.0)),
            ),
            decoration: new BoxDecoration(
              color: _item.isSelected
                  ? Colors.blueAccent
                  : Colors.transparent,
              border: new Border.all(
                  width: 1.0,
                  color: _item.isSelected
                      ? Colors.blueAccent
                      : Colors.grey),
              borderRadius: const BorderRadius.all(const Radius.circular(2.0)),
            ),
          ),
          new Container(
            margin: new EdgeInsets.only(left: 10.0),
            child: new Text(_item.text),
          )
        ],
      ),
    );
  }
}

class RadioModel {
  bool isSelected;
  final String buttonText;
  final String text;

  RadioModel(this.isSelected, this.buttonText, this.text);
}

FormBuilderRadioGroup sample code for radio button flutter

import 'package:flutter/material.dart';
 
void main() => runApp(MyApp());
 
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
        title: Text("Flutter Radio Button Group Example"),
        ),
        body: SafeArea(
          child : Center(
 
          child:RadioGroup(),
 
          )
        )
      ),
    );
  }
}
 
class RadioGroup extends StatefulWidget {
  @override
  RadioGroupWidget createState() => RadioGroupWidget();
}
 
class FruitsList {
  String name;
  int index;
  FruitsList({this.name, this.index});
}
 
class RadioGroupWidget extends State {
 
  // Default Radio Button Item
  String radioItem = 'Mango';
 
  // Group Value for Radio Button.
  int id = 1;
 
  List<FruitsList> fList = [
    FruitsList(
      index: 1,
      name: "Mango",
    ),
    FruitsList(
      index: 2,
      name: "Apple",
    ),
    FruitsList(
      index: 3,
      name: "Banana",
    ),
    FruitsList(
      index: 4,
      name: "Cherry",
    ),
  ];
 
  Widget build(BuildContext context) {
    return Column(
        children: <Widget>[
           Padding(
            padding : EdgeInsets.all(14.0),
            child: Text('$radioItem', style: TextStyle(fontSize: 23))
              ),
 
           Expanded(
            child: Container(
            height: 350.0,
            child: Column(
              children: 
                fList.map((data) => RadioListTile(
                  title: Text("${data.name}"),
                  groupValue: id,
                  value: data.index,
                  onChanged: (val) {
                    setState(() {
                      radioItem = data.name ;
                      id = data.index;
                    });
                  },
                )).toList(),
            ),
          )),
          
        ],
    );
  }
}