A presentation at Codemotion Madrid in in Madrid, Spain by Horacio Gonzalez
Madrid | November 30 - December 1, 2018 Hey people, have you looked at Flutter yet? Horacio Gonzalez @LostInBrittany Flutter @LostInBrittany
Horacio Gonzalez @LostInBrittany Spaniard lost in Brittany, developer, dreamer and all-around geek Flutter @LostInBrittany
What's Flutter? Yet another mobile solution? Flutter @LostInBrittany
Flutter Flutter is Google's new open-source mobile UI toolkit, helping developers to craft high-quality native experiences across mobile platforms in record time Flutter @LostInBrittany
Flutter Flutter is Google's new open-source mobile UI toolkit, helping developers to craft high-quality native experiences across mobile platforms in record time Flutter @LostInBrittany
Flutter Flutter is Google's new open-source mobile UI toolkit, helping developers to craft high-quality native experiences across mobile platforms in record time Flutter @LostInBrittany
Flutter Flutter is Google's new open-source mobile UI toolkit, helping developers to craft high-quality native experiences across mobile platforms in record time Flutter @LostInBrittany
Flutter Flutter is Google's new open-source mobile UI toolkit, helping developers to craft high-quality native experiences across mobile platforms in record time Flutter @LostInBrittany
Flutter Flutter is Google's new open-source mobile UI toolkit, helping developers to craft high-quality native experiences across mobile platforms in record time Flutter @LostInBrittany
Flutter Flutter is Google's new open-source mobile UI toolkit, helping developers to craft high-quality native experiences across mobile platforms in record time Flutter @LostInBrittany
Flutter Flutter is Google's new open-source mobile UI toolkit, helping developers to craft high-quality native experiences across mobile platforms in record time Flutter @LostInBrittany
Looking back Diving into the history of mobile app development Flutter @LostInBrittany
In a time almost forgotten When even internet was young... Flutter @LostInBrittany
At the beginning there were the SDKs Your app Platform Canvas OEM Widgets Native Code Flutter Events Services Location Bluetooth Audio Sensors Camera etc, @LostInBrittany
Then the Webviews... Your app Platform Canvas WebView Events Services Bridge JavaScript Flutter Location Bluetooth Audio Sensors Camera etc, @LostInBrittany
And the Reactive views Your app Platform Canvas JavaScript Bridge OEM Widgets Flutter Events Services Location Bluetooth Audio Sensors Camera etc, @LostInBrittany
Enter Flutter Your app Platform Canvas Widgets, Rendering Events Services Native Code Platform Channels Flutter Location Bluetooth Audio Sensors Camera etc, @LostInBrittany
Flutter architecture Flutter @LostInBrittany
But why Dart? Because Google, duh! …or maybe there are good reasons? Flutter @LostInBrittany
Dart can be compiled AOT or JIT Development builds: Custom VM offers super fast hot reload change cycle Flutter Release builds: Full AOT-compilation to native machine code offers super fast startup and execution @LostInBrittany
Dart's allocation and GC ● Many new objects: ○ Lock-free, fast allocation ● Short-lived objects: ○ Precise, generational garbage collection Flutter @LostInBrittany
Dart is an easy, familiar language An easy language: ● No exotic syntax ● Easy to read, easy to write ● Very expressive A familiar language: ● JavaScript devs find it easy to learn ● Java / C# devs even more Flutter @LostInBrittany
Layout How Flutter does layout? CSS like? XML like? Flutter @LostInBrittany
Traditional rule based layouts Large set of rules ● Fixed ● Applied to all the widgets Cascading application ● Interactions & conflicts ● Low performance Flutter @LostInBrittany
Chrome team experiment Could a different layout model allow faster rendering? ● Each widget specifies its own simple layout model ● Less rules, heavily optimized ● Complex layouts are turned into widgets Flutter @LostInBrittany
Everything is a widget Layouts Margin Padding are widgets Themes even scrolling is a widget! Application Navigation Flutter @LostInBrittany
Le Layout Flutter @LostInBrittany
Le Layout Flutter @LostInBrittany
Le Layout class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { Widget titleSection = new Container( padding: const EdgeInsets.all(32.0), child: new Row( children: [ new Expanded( child: new Column( crossAxisAlignment: CrossAxisAlignment.start, children: [ new Container( padding: const EdgeInsets.only(bottom: 8.0), child: new Text( 'Oeschinen Lake Campground', style: new TextStyle( fontWeight: FontWeight.bold, ), ), ), new Text( 'Kandersteg, Switzerland', style: new TextStyle( color: Colors.grey[500], ), ), ], ), ), new Icon( Icons.star, color: Colors.red[500], ), new Text('41'), ], ), ); } Flutter @LostInBrittany
Le Layout class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { Widget titleSection = new Container( padding: const EdgeInsets.all(32.0), child: new Row( children: [ new Expanded( child: new Column( crossAxisAlignment: CrossAxisAlignment.start, children: [ new Container( padding: const EdgeInsets.only(bottom: 8.0), child: new Text( 'Oeschinen Lake Campground', style: new TextStyle( fontWeight: FontWeight.bold, ), ), ), new Text( 'Kandersteg, Switzerland', style: new TextStyle( color: Colors.grey[500], ), ), ], ), ), new Icon( Icons.star, color: Colors.red[500], ), new Text('41'), ], ), ); } Flutter @LostInBrittany
Widget Inspector Flutter @LostInBrittany
Responsive ? Flutter @LostInBrittany
Responsive ! Scaffold Scaffold Row ListView GridView Flutter @LostInBrittany
Gestion des thèmes Flutter @LostInBrittany
Material Design 2.0 Flutter @LostInBrittany
Blazing fast and flexible layouts Flutter @LostInBrittany
Show us some code There are developers in the room, you know... Flutter @LostInBrittany
Let's begin with a Hello World... import 'package:flutter/material.dart'; void main() { runApp( new Center( child: new Text( 'Hello, world!', textDirection: TextDirection.ltr, ), ), ); } You will never do that IRL... Flutter @LostInBrittany
Extending Stateless Widget import 'package:flutter/material.dart'; class MyAppBar extends StatelessWidget { @override Widget build(BuildContext context) { return new Center( child: new Text( 'Hello, world!', textDirection: TextDirection.ltr, ), ); } } void main() { runApp(new MyAppBar()); } A widget’s main job is to implement a build function Flutter @LostInBrittany
Complex layouts column body: new Column( children: [ imageSection( path: 'images/lake.jpg', ), titleSection( heading: 'Oeschinen Lake Campground', subtitle: 'Kandersteg, Switzerland', stars: stars, ), buttonSection(), textSection( text: 'Lake Oeschinen lies at the...'), ], ), image titles actions text Flutter? @LostInBrittany Flutter @LostInBrittany
‘UI-as-code’ new Row( mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: [ new IconAction(icon: Icons.call, label: 'CALL'), new IconAction(icon: Icons.near_me, label: 'ROUTE'), new IconAction(icon: Icons.share, label: 'SHARE'), ]) Flutter? @LostInBrittany Flutter @LostInBrittany
Composability class IconAction extends StatelessWidget { const IconAction({this.icon, this.label, this.onTap}); Widget build(BuildContext context) { return new InkWell( child: new Column( children: [ new Icon(icon, color: primaryColor), new Container( margin: const EdgeInsets.only(top: 8.0), child: new Text( Label style: new TextStyle(color: primaryColor), ), ), ], ), onTap: onTap, ); } } Flutter? @LostInBrittany Flutter @LostInBrittany
Why to choose Flutter? OK, so it's a new technology to build mobile apps, rather cool, yeah… but why should I choose it? Flutter @LostInBrittany
Why choose Flutter? Beautiful Productive Fast Extensible Flutter @LostInBrittany
Beautiful Control every pixel on the screen Make your brand come to life Never say "no" to your designer Stand out in the marketplace Win awards with beautiful UI Flutter @LostInBrittany
Fast Brings the power of a games engine to user experience development 60fps, GPU accelerated Compiled to native machine code Flutter @LostInBrittany
Productive Sub-second reload times Paint your app to life Iterate rapidly on features Test hypotheses quicker than ever More time to experiment & test features Single-codebase for faster collab 3X Productivity Gains Flutter @LostInBrittany
Extensible Everything is free and open source Layered architecture: easy to extend Deep platform integrations Hundreds of third-party packages (ads, videos, database, cloud etc.) Flutter @LostInBrittany
A wonderful time to begin with Flutter Flutter is getting momentum, and the 1.0 is around the corner... Flutter @LostInBrittany
Flutter 1.0 on the starting blocks Latest release: Flutter Release Preview 2 Flutter @LostInBrittany
Getting momentum StackOverflow Question Views Flutter @LostInBrittany
Integration with popular tools 3rd-part y Android SDKs Android Studio Xcode VS Code Firebase 3rd-part y iOS SDKs Android APIs iOS APIs Flutter Material Design Redux @LostInBrittany
Thank you! Flutter @LostInBrittany
Ya nos han dicho que Flutter es el SDK de Google para aplicaciones móviles que permite escribir interface nativos en iOS y Android en un tiempo record, que es gratuito y libre y que tiene una gran flexibilidad. En esta charla mostraremos realmente porqué Flutter es una de las plataformas de desarrollo más productivas y agradables y enseñaremos también cómo puede usarse para crear interfaces bonitas y eficaces con pocas líneas de código y casi sin código inútil. Y para ser honestos, también hablaremos de sus puntos débiles y cómo se trabaja para mejorarlo desde la comunidad.
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