Onclick Floating Button Show Alert Dialog Box Using Flutter

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.red,
      ),
      home: MyHomePage(title: 'Onclick Floting Button Show AlertBox'),
    );
  }
}
class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
  void _showDialog() {
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: Row(
              children:[
                IconButton(icon: Icon(Icons.notifications_none,size: 25,color: Colors.red,),onPressed: () {},),
                Text('  Alert Dialog.',style: TextStyle(color:Colors.red),)
              ]
          ),
          content: Text("Are You Sure Want To Proceed?"),
          actions: <Widget>[
            FlatButton(
              child: Text("CANCEL",style: TextStyle(color:Colors.red),),
              onPressed: () {
                Navigator.of(context).pop();
              },
            ),
          ],
        );
      },
    );
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'Push the FAB to display a dialog.',
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        backgroundColor: Colors.red,
        onPressed: _showDialog,
        tooltip: 'Show Dialog',
        child: Icon(Icons.close,),
      ),
    );
  }
}