Skip to main content

Sub-second reloads for mobile developers with Flutter and Dart

Developers inside and outside of Google have told us they are looking for a better way to build apps that delight all their users, without having to build the app twice. To help, we've been working closely with the Flutter team to build an open-source SDK that helps developers write beautiful UIs for all of mobile from a single codebase. Currently in technology preview, Flutter is being used by teams inside of Google.

At the previous Dart Developer Summit, the Flutter team showed how they used Dart to render mobile graphics and spinning square. Fast-forward to today: the Flutter team demoed their near-complete implementation of material design and showed real apps built with Flutter running on iOS and Android.



Flutter is different than other mobile SDKs. It's built with a best-in-class text rendering engine and the same 2D-to-GL library that Chrome (and others) use, which means its lowest layers are battle-hardened and proven. Flutter does not use the OEM widgets, instead it paints every pixel using its framework and graphics engine. This gives developers tremendous control and expressiveness across all of mobile. However, apps built with Flutter try to feel natural on iOS and Android; Flutter's framework embraces platform differences like scroll physics, iconography, fonts, and gestures.

A key benefit of using Flutter is its extremely fast development cycle, thanks to the Dart VM and Flutter's functional-reactive framework. For both iOS and Android, hardware and emulators, developers using Flutter can experience sub-second dev cycles as they add and debug app UIs. The app's state is maintained during the reloads, which means developers can iterate very quickly without restarting their app for every change. "We measure our dev cycles in milliseconds", said Eric Seidel, engineer on Flutter.

The new Flutter plugin for IntelliJ was also announced. Building on the existing strong support for Dart on the JetBrains platform, the Flutter plugin helps you run, debug, and hot reload on mobile devices and emulators from within a full IDE.



Though much progress has been made, Flutter is still in technology preview. The Flutter and Dart teams are working to build out further features such as accessibility and a plugin architecture.

To learn more about Flutter's tech preview, please visit flutter.io and github.com/flutter.

Popular posts from this blog

Const, Static, Final, Oh my!

Posted by Seth Ladd

(This is an "oldie but a goodie" misc@dartlang.org post originally written by Bob Nystrom. It is being posted here as the explanations still ring true.)

Bob writes:


"static", "final", and "const" mean entirely distinct things in Dart:

"static" means a member is available on the class itself instead of on instances of the class. That's all it means, and it isn't used for anything else. static modifies *members*.

"final" means single-assignment: a final variable or field *must* have an initializer. Once assigned a value, a final variable's value cannot be changed. final modifies *variables*.

"const" has a meaning that's a bit more complex and subtle in Dart. const modifies *values*. You can use it when creating collections, like const [1, 2, 3], and when constructing objects (instead of new) like const Point(2, 3). Here, const means that the object's entire deep state can be determ…

AngularDart 4

AngularDart v4 is now available. We've been busy since the release angular2 v3.1.0 in May. Not only did we "drop the 2", but we also improved the compiler and tightened up the framework to give you smaller code, we updated the package structure to improve usability, and we added several new features. Check out the updated documentation to get started.
Just angular Upgrading to v4 will require more than updating your version constraint. The package has changed names (back) to angular – dropping the 2. You'll need to update your pubspec.yaml and the corresponding imports in your code. In most instances, find-and-replace should do the trick. Going forward, the package will be called package:angular. We'll just update the version number.
Smaller code The updated compiler in 4.0 allows type-based optimizations that not only improve runtime performance but generate better code because we are able to strongly type templates. A big result of the update is that many ap…

The new AdWords UI uses Dart — we asked why

Google just announced a re-designed AdWords experience. In case you’re not familiar with AdWords: businesses use it to advertise on google.com and partner websites. Advertising makes up majority of Google’s revenue, so when Google decides to completely redo the customer-facing front end to it, it’s a big deal. The Dart team is proud to say that this new front end is built with Dart and Angular 2. Whenever you asked us whether Google is ‘even using Dart for anything,’ this is what we had in mind but couldn’t say aloud. Until now. We asked Joshy Joseph, the primary technical lead on the project, some questions. Joshy is focusing on things like infrastructure, application latency and development velocity, so he’s the right person to ask about Dart.Q: What exactly did we launch on Monday?It’s a complete redesign of the AdWords customer experience that is rolling out slowly as a test to a small initial set of advertisers. The most noticeable thing is probably the Material Design look and f…