dialog.dart

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

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

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

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


  @override
  Widget build(BuildContext context) {

    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
          child: AlertDialog(
        title: Text('Add your address!'),
        contentPadding: EdgeInsets.all(18),
        content: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            TextFormField(
              decoration: InputDecoration(hintText: 'Address Title'),
            ),
            TextFormField(
              decoration: InputDecoration(
                labelText: 'Click Scan HTML Address Button!',
                hasFloatingPlaceholder: true,
                icon: Padding(
                  padding: const EdgeInsets.all(0.0),
                  child: null,
                ),
              ),
            ),
          ],
        ),
        actions: <Widget>[
          FlatButton(
            child: Text('Cancel'),
            onPressed: () {},
          ),
          FlatButton(
            child: Text('Save'),
            onPressed: () {},
          ),
        ],
      )),
    );
  }
}