[MUSIC PLAYING] TIM SNEATH: Welcome
to Flutter Engage. Today is a key
milestone for Flutter with the launch of Flutter 2. The big news in
Flutter 2 is that we've broadened Flutter from
a mobile framework to a portable framework,
unleashing your apps to run on a wide variety
of different platforms with little or no change. You can think of Flutter 2 as
a free upgrade for your app. With Flutter 2,
your app can target four additional platforms-- Windows, Mac OS,
Linux, and the web. We asked our friends at gskinner
to create a demo app that spans all these platforms. SPEAKER 1: We decided
to build a scrapbooking app called Flutter Folio. So I'd like to invite you to
visit flutter.gskinner.com, where you'll find
more info, source code, and links to the app. Ultimately, we were able to
build an app that runs great and feels at home on three form
factors, five OSs, and the web while reusing over
95% of our code. TIM SNEATH: Flutter isn't just
being used outside Google. Over a thousand engineers
inside the company are using Dart and Flutter
to develop apps today. One of the largest apps
from Google using Flutter is Google Pay. PEEYUSH RANJAN: We decided
to rewrite everything. We ended up with a 35%
smaller code base-- 1.1 million lines compared
to 1.7 million lines. And at the same
time, our tech debt went down by 90% on
a per engineer basis. Now, once the rewrite
was done, we also found that our
engineers were 20% more productive in terms of
features implemented because of the rewrite. We were able to take the iOS
engineers and Android engineers and get 50% engineering
efficiency immediately because they were all
working on the same thing. TIM SNEATH: Phones come in
so many different shapes and sizes. And one of the latest
trends is foldable phones. One great example
of this form factor is the Surface Duo
from Microsoft. GUY MERIN: Today,
we're happy to announce that we are
collaborating with Google and bringing foldable
support to Flutter. We're contributing
code to enable Flutter apps to take advantage
of these new opportunities with devices like
the Surface Duo, but also enable it
on other devices from manufacturers like
Samsung and others. TIM SNEATH: So let's
talk about portability. Today, we're
delighted to announce that Flutter support
for the web platform has hit the Stable milestone. DION ALMAER: Now, the
web has many strengths, including ubiquity and reach. So if you're building
a Flutter app, you now get to reach users
outside of app stores. And with the power of URLs,
users across operating systems or device types
could be directed to any part of your
app, from links that are shared by friends,
clicked on in search, from an email, from anywhere. TIM SNEATH: I want to show you
one example of the kind of app that shines really
well on the web. iRobot is the company behind the
popular Roomba robot vacuums. But they also have
coding robots that empower the next
generation of innovators. iRobot built their
app with Flutter. And today, they're
launching the web version of their experience. So here, you can
see the app running in the browser using the same
code as their tablet app. Today, we're delighted to
announce that we're also opening up desktop to the stable
channel of Flutter, enabled with an early release flag. This release lets you produce
standalone executables for each platform-- Mac OS, Linux, and Windows. On Linux, Canonical has
been a fantastic partner. KEN VANDINE: We not only
enabled Flutter for Linux, we also worked with
the Flutter team to publish the Flutter SDK as a
snap in the Snap Store, the app store for Linux. By publishing the
Flutter SDK as a snap, we've made it very
easy to install and set up your
development environment to build mobile,
web, and desktop apps with Flutter on Ubuntu. Flutter is the default
choice for future desktop and mobile apps
created by Canonical. TIM SNEATH: There are even
more screens out there beyond the kind of
operating system that you might have on
your phone or your PC. Toyota are building
Flutter right into the heart of
their core product. DANIEL HALL: Today, we're
excited to announce that Toyota is partnering with
Flutter to bring a best-in-market digital
experience to vehicles by building infotainment
systems powered by Flutter. We see working with
open-source software as a positive investment
towards our in-vehicle user experiences, and we
look forward to playing a role in the open-source
Flutter community. TIM SNEATH: Let's now
go one level deeper and talk about Dart. BOB NYSTROM: I'm very
happy to tell you that we have shipped
Null Safety for Dart. So now the type system helps you
eliminate null reference bugs. This is the biggest
change to Dart since we added sound
static types in Dart 2. With Null Safety, we didn't
just add non-nullable types to the type system,
we also added a slew of features like smarter
flow analysis, late variables, and required named parameters
so that your Dart code isn't just safe, but easy to write. Dart gives you more than
most other languages with non-nullable types, too. Null safety in Dart is sound. That means that when your
program is fully migrated, the type system guarantees,
like a mathematical proof, that no non-nullable expression
can ever evaluate to null. A fast language is no use
if you can't productively write code in it. So next, Kenzie's going to
talk about developer tools. KENZIE SCHMOLL: Now, I
know what you're thinking. Framework improvements
are great and bring all sorts of new and improved
functionality to you. But usually, they also come
with some breaking changes to your code. Well, fear not,
because what we've also done as part of
Flutter 2 is created a tool called Flutter Fix. This is a sample app that hasn't
been updated in a couple years now. So now that I
updated to Flutter 2, there are some analysis
errors to address. You can see that it's using
a couple deprecated APIs. So let's click on
one of these warnings and see how we can
solve the problem. I can see the deprecated member
here, as well as the Quick Fix icon. And the Quick Fix option allows
me to automatically migrate my code to the new API. So now I can see my
code has been updated, and the warnings have gone away. TIM SNEATH: Our developer
tools are another example of the unique flexibility of
Flutter, built with Flutter, for Flutter, and integrated into
whatever tool you're running. As of right now, there
are over 15,000 packages for Flutter and Dart
from big companies like Amazon, Microsoft,
Adobe, Huawei, Alibaba, eBay, and Square. We're also today
announcing a major update to our Flutter plugins
for several core Firebase services-- authentication, cloud
Firestore, cloud functions, cloud messaging,
cloud storage, and crashlytics. We've updated all these packages
to support sound null safety. But there's another major
package we're releasing today. ZOEY FAN: We're
excited to announce an open beta for the Google
Mobile Ads SDK for Flutter. This is a brand new plugin
that provides inline banner and native ads, in addition to
the existing overlay formats. We've been piloting
this plugin with some of our early customers in
a private beta program. Sua Musica is one of them. SPEAKER 2: We've
had amazing metrics, showing an increase
of performance since we made the change. We saw a 350% increase
on impressions, we have a 43% increase on CTR,
and 13% increase on our eCPM. ZOEY FAN: The Google
Mobile Ads SDK for Flutter is available today for you
to download from pub.dev. TIM SNEATH: Flutter
is the first UI platform that is designed for
an ambient computing world. And this vision is unique to
Flutter, a portable toolkit for building beautiful, native,
fast experiences wherever you might want to paint
pixels on the screen. [MUSIC PLAYING]
