Form Layout

import 'package:flutter/material.dart';
import 'package:grouped_buttons/grouped_buttons.dart';

class FormExample extends StatelessWidget {

  final GlobalKey<FormState> _formKey = new GlobalKey<FormState>();

  @override
  Widget build(BuildContext context) {
    final Size screenSize = MediaQuery.of(context).size;

    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Form Example  '),
      ),
      body: new Container(
        padding: new EdgeInsets.all(20.0),
        child: new Form(
          key: this._formKey,
          child: new ListView(
            children: <Widget>[
              new TextFormField(
                keyboardType: TextInputType.text, // Use email input type for emails.
                decoration: new InputDecoration(
                  hintText: 'Enter your name',
                  labelText: 'Name'
                )
              ),
              new TextFormField(
                keyboardType: TextInputType.phone, // Use email input type for emails.
                decoration: new InputDecoration(
                  hintText: '0*** **** ****',
                  labelText: 'Telp'
                )
              ),
              new TextFormField(
                keyboardType: TextInputType.emailAddress, // Use email input type for emails.
                decoration: new InputDecoration(
                  hintText: 'email@example.com',
                  labelText: 'E-mail'
                )
              ),
              new TextFormField(
                obscureText: true, // Use secure text for passwords.
                decoration: new InputDecoration(
                  hintText: 'Enter your password',
                  labelText: 'Password'
                )
              ),
              new TextFormField(
                obscureText: true, // Use secure text for passwords.
                decoration: new InputDecoration(
                  hintText: 'Enter your age',
                  labelText: 'Age'
                )
              ),
              new TextFormField(
                obscureText: true,
                keyboardType: TextInputType.multiline,
                maxLines: 3,
                decoration: new InputDecoration(
                  hintText: 'Enter your address',
                  labelText: 'Address'
                )
              ),

              new Container(
                width: screenSize.width,
                child: new RaisedButton(
                  child: new Text(
                    'Simpan',
                    style: new TextStyle(
                      color: Colors.white
                    ),
                  ),
                  onPressed: () => null,
                  color: Colors.blue,
                ),
                margin: new EdgeInsets.only(
                  top: 20.0
                ),
              )
            ],
          ),
        )
      ),
    );
  }
}