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Announcing Flutter 1.22

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Supporting iOS 14 and Android 11, sleek i18n and l10n toughen, Google Maps and WebView plugins prepared for manufacturing, a sleek App Size tool and hundreds more!

Chris Sells

We’re satisfied to introduce our latest release of Flutter, with broad toughen for iOS 14 and Android 11. Flutter 1.22 builds on the basis space by outdated releases by enabling developers to fetch rapid, gorgeous person experiences for just a few platforms from a single codebase. Our quarterly steady releases equipment the latest parts, efficiency enhancements, and bug fixes, and are appropriate form for first-charge manufacturing exercise.

Since right here’s the season for model spanking sleek mobile OS versions, this release makes a speciality of guaranteeing that Android 11 and iOS 14 work first-charge with Flutter. Updates for both of these OSes consist of diverse below-the-hood work to conform to the latest SDKs and to execute sure that that all the things passes our broad test suite. For iOS 14, this release includes toughen for the sleek Xcode 12, sleek icons, and preview toughen for the sleek iOS 14 App Clips feature. For Android 11, the update helps the sleek forms of divulge cutouts as successfully as smoother animation when citing the soft keyboard.

This release comes two months after our 1.20 release, so it was as soon as shorter than most. Even in that rapid time, we closed 3,024 points and merged 1,944 PRs from 197 contributors. Of these contributors, 114 (58%) of them were from the group-at-first-charge and in declare that they contributed 271 PRs. The finest single contributor was as soon as a14n, who makes our top contributor checklist again with 20 PRs, most of which were done as segment of the work to toughen null safety in Flutter (more on that coming rapidly).

As successfully as to the toughen for the sleek mobile OS versions, there’s reasonably rather a lot more news to portion, at the side of a preview of one of many cease-requested parts for Android: converse restoration, a sleek “universe” of Subject cloth buttons, sleek global and localization toughen that works with hot reload, a sleek Navigator, a gradual release for Platform Views (the basis for the Google Maps and WebView plugins), and a swap that it is possible you’ll throw on your code to toughen scrolling on devices with excessive frequency displays. We’ve also got a sleek tool for dissecting app dimension and for guaranteeing that the plugins that you’re constructing toughen easiest the platforms that you genuinely are searching to toughen.

Each time a sleek model of a mobile OS is announced, we test it thoroughly, buying for incompatibilities or modifications that possess an impression on Flutter and its instruments.

Within the case of iOS 14, we made plenty of modifications to Flutter to execute sure that that it works the manner developers desire:

  • Xcode 12 requires iOS 9.0 or up, so our default template will increase its default from 8.0 to 9.0
  • iOS 14 say crashes and font rendering points were mounted in Flutter 1.22
  • Issues deploying to physical devices were mounted as of Flutter 1.20.4
  • A sleek protection that reveals uses notifications when apps fetch admission to their clipboard triggered false notifications in Flutter apps, and was as soon as mounted as of Flutter 1.20.4
  • A restriction disables working debug apps on iOS 14 devices other than as segment of the debugging process
  • A sleek protection spherical community security for in the community debugged Flutter apps causes iOS 14 to give an explanation for a one-time affirmation dialog (easiest at some stage in pattern, no longer for launched Flutter apps)

Base line: if you occur to’re concentrated on iOS 14 along with your Flutter app, we strongly abet you to rebuild it with Flutter 1.22 and deploy it to the App Retailer now to execute sure that that your iOS 14 users possess the finest expertise.

For more small print about concentrated on iOS 14 with Flutter, at the side of some Add-to-App, deep linking, and notification considerations, consult with the iOS 14 documentation on flutter.dev.

Hopefully, all of this work on the tooling and SDK toughen helps you to focal point on the coding that you care about — taking profit of sleek iOS 14 parts.

One such feature is up up to now toughen for iOS’s sleek SF Symbols font, which impressed us to exercise some time giving the cupertino_icon equipment a refresh. Existing uses of CupertinoIcons will robotically scheme to the sleek vogue as soon as you update your cupertino_icons dependency to the sleek 1.0 principal model. While you exhaust cupertino_icons 1.0 along side Flutter 1.22, you’ll even possess fetch admission to to ~900 sleek icons by plan of the CupertinoIcons API.

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You may peer the total checklist of icons on the cupertino_icons preview web page and a migration detail web page on flutter.dev.

One other feature so that you can set up out with Flutter on iOS 14 is App Clips, a sleek iOS 14 feature that helps fleet, no-install app executions of sunshine-weight versions of apps below 10MB. In Flutter model 1.22, we have a preview of App Clip targets built with Flutter.

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A Flutter-powered App Clip expertise

For more small print on how one can fetch App Clips with Flutter, test out the doctors on flutter.dev. You may per chance additionally additionally search the advice of this easy pattern project.

This release of Flutter also coincides with the open of Android 11 this month. The Flutter framework and engine had been up up to now to toughen two sleek parts launched in the latest model of Android.

Initially, Flutter now helps exposing the satisfactory insets of Android notches, cutouts and edges of waterfall displays.

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By the exercise of the MediaQuery and SafeArea APIs, that it is possible you’ll execute sure that that you’re placing active UI and interactive parts in the non-obstructed regions of the tool’s divulge. Additionally, you’ll are searching to steer clear of gesture detectors in the waterfall edge station that will even be at probability of accidental touches.

Secondly, the animation is synchronized with Android 11 because it displays the tool keyboard.

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Glance the put animation of the FAB

Say of affairs #19279 has been a prolonged-standing disclose the put the gadget keyboard account for/conceal animation isn’t synchronized with Flutter’s inset. Here is mounted for Android 11.

One account for about the Android embedding API. With Flutter model 1.12 finest year, we rolled out a sleek space of Flutter engine and Flutter plugin APIs for Android. We created these v2 APIs to greater toughen our add-to-app users on Android. A year later, over 80% of our Android plugins exercise the sleek Android APIs. Beginning in 1.22, we’re deprecating the older v1 APIs.

While you’re restful the exercise of the Android v1 API, right here’s what this suggests for you:

  • Newly created plugins will now no longer target the v1 APIs
  • The Flutter tool’s —no-enable-android-embedding-v2 config flag has been eliminated and is now the default habits
  • Older capabilities restful the exercise of the v1 APIs will account for a deprecation warning at some stage in fetch that points to the Supporting the sleek Android plugins APIs doctors

Within the intervening time, if you occur to restful possess a Flutter application essentially based on v1 Android APIs, this is succesful of continue to work. On the different hand, it is possible you’ll most certainly also delivery to stumble upon sleek plugins that easiest target the v2 API and that can’t be consumed by v1 Android APIs. For more small print, peer the breaking alternate documentation.

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A sleek universe of Subject cloth Assemble buttons

Existing Flutter buttons sight appropriate but shall be laborious to make exercise of, especially if you occur to need customized theming. Furthermore, the Subject cloth specification has expanded to incorporate sleek buttons with sleek styles.

To preserve Flutter up up to now with Subject cloth pointers, we’re happy to voice a complete sleek “universe” of buttons in Flutter 1.22.

Quite than try to evolve the sleek button classes and their theme in-put, this PR introduces sleek, alternative button widgets and subject issues. As successfully as to releasing us from the backwards compatibility labyrinth that evolving the sleek classes would entail, the sleek names sync Flutter with the Subject cloth Assemble spec, which uses the sleek names for the button parts.

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The sleek subject issues put together the “normalized” pattern that Flutter has fair as of late adopted for model spanking sleek Subject cloth widgets. While you’d like to play with a demo, there’s a first-charge one right here on DartPad. Here just isn’t any longer a breaking alternate as the semantics of FlatButton, OutlineButton, RaisedButton, ButtonBar, ButtonBarTheme, and ButtonTheme won’t alternate. You may mix ‘n match the outmoded buttons with the sleek. as you raise.

Flutter has supplied the core efficiency you wish for the internationalization (i18n) and localization (l10n) of your apps since Flutter’s inception. On the different hand, with this release, we’ve baked our opinions of easiest practices into our instruments, even enabling hot reload toughen to update your app as you add sleek l10n details.

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While you’d like more small print about Flutter’s toughen for l10n, at the side of localized messages, messages with parameters, dates, numbers, and currencies, be taught the Flutter Internationalization User Book.

Furthermore, if you occur to’re attracted to i18n and l10n, then you definately’re potentially also attracted to strings with characters that don’t match into undeniable outmoded ASCII, like Unicode and emoji. No longer too prolonged ago, the Streak crew launched the characters equipment, which helps developers kind out Unicode (prolonged) grapheme clusters. This equipment helps resolve concerns like how one can successfully abbreviate a string like “A 🇬🇧 text in English” to the foremost 15 characters. The exercise of the String class, that abbreviation may per chance be “A 🇬🇧 text in”, which is easiest 12 person-perceived characters. On the different hand, the exercise of the characters equipment yields the suitable abbreviation of “A 🇬🇧 text in Eng”.

With this PR, Flutter uses the characters equipment to successfully kind out these complex characters. As an illustration, when the exercise of a TextField with a maxLength limit, characters like 👨‍👩‍👦 are in actuality successfully counted as a single character. Additionally, with this PR, the characters equipment is robotically on hand in projects wherever Flutter is, with out needing to manually add it. Hopefully this makes it even more straightforward to cope with strings of all styles from all locales. For more small print about the characters equipment, test out the fine article, Streak string manipulation done appropriate 👉.

Here on the Flutter crew, we’re most incessantly cautious about labeling one thing as “manufacturing prepared” unless we’ve tested it thoroughly ourselves. Within the case of the google_maps_flutter and webview_flutter plugins, the gating disclose has been the underlying Platform Views implementation, which permits native UI parts from both Android and iOS to be hosted in a Flutter app. With this release of Flutter, we’re happy to voice that we have hardened the framework plumbing satisfactory to divulge both of these plugins as manufacturing prepared.

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webview_flutter plugin web hosting flutter.dev

In Flutter 1.22, we’ve added an different Platform Views implementation that fixes all acknowledged keyboard, and accessibility points for Android views. Additionally, it works with Android API level 19 and above (it mature to require level 20). Now we possess also made threading enhancements on iOS that execute platform views more efficient and more sturdy (and now no longer requires you to add the io.flutter.embedded_views_preview flag to your iOS Info.plist).

The webview_flutter plugin helps the sleek Android Platform Views mode but at this time it shall be enabled manually. We’ll enable it by default in future versions as soon because it’s gotten more exercise in the broader group.

The Google Maps and WebView plugins already fetch pleasure from the enhancements in Platform Views. While you’d like to make exercise of Platform Views to host your dangle native UI parts on iOS or Android, that it is possible you’ll be taught to attain so on Web web hosting native Android and iOS views on your Flutter app with Platform Views.

While you’ve mature navigation on your Flutter apps forward of, it is possible you’ll most certainly even possess seen that the core details construction, the stack of pages that your person is navigating by plan of, is hidden from you. As a exchange, to preserve watch over it, you call Navigator.pop() or Navigator.push(). As an illustration, let’s converse that you wished to give an explanation for a listing of widgets on your condominium web page and allow the person to tap on one to fetch to a detail web page dedicated to appropriate that color.

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The two monitors may per chance even be utilized like so:

The exercise of the finest Navigator 1.0 vogue helps you to navigate between these two monitors in a technique that appears to be like to be glossy easy:

The decision to Navigator.push() is all that’s well-known to push one more web page on top of the foremost one, constructing a stack of two pages. On the different hand, not just like the checklist of Containers created in the fetch approach of the ColorListScreen, that stack is hidden from you. And attributable to it’s hidden, it’s laborious to preserve watch over for other eventualities, like handling deep linking with an preliminary route supplied by a native embedding, as an illustration, or a URL from the glean or intent from Android. It’s also exceedingly subtle to preserve watch over nested routing between diverse arrangements of the same web page.

Navigator 2.0 solves these concerns and more by making the stack of pages seen. Here’s an up up to now example of navigating between the same ColorListScreen and ColorScreen:

The app explicitly creates a Navigator and presents it a listing of pages that represents the total stack. We fetch an empty _selectedColor to mark that no color has yet been chosen, so we don’t account for the ColorScreen at the delivery. When the person selects a color, we call setState() as usual to mark to Flutter that you’d just like the fetch() approach known as again, which now creates a stack with the ColorScreen on top.

You update your converse in the OnPopPage call again, as an illustration, if the person popped, then they’ve “unselected” the sleek color and we now no longer are searching to give an explanation for that web page.

If Navigator 2.0 appears to be like to be just like the the rest of Flutter, that’s the intent — it’s declarative, not like Navigator 1.0 which is crucial. The premise was as soon as to unify the objects between navigation and the the rest of Flutter while simultaneously fixing a bunch of points and adding parts. Truly, this runt example barely scratches the outside of what’s in Navigator 2.0. For the small print, I extremely recommend the article on Declarative navigation and routing in Flutter.

Additionally, your sleek exercise of Navigator 1.0 will continue to work appropriate because it does as of late and won’t be eliminated anytime rapidly. While you raise that model, that it is possible you’ll absolutely continue to make exercise of it. On the different hand, if you occur to are attempting Navigator 2.0, we mediate you’ll prefer it.

A sleek feature that is on hand so that you can experiment with on this release is toughen for Say Restoration on Android. Here is one of our most-requested parts with 217 thumbs up!

For these no longer mindful of the need for converse restoration, mobile OSes would perhaps also waste apps that are in the background to reclaim assets for foreground apps. When this occurs, the OS notifies the app to be killed to set up any UI converse mercurial so as that it can be restored when the person cycles again to that app. When utilized precisely, this presents a seamless expertise for the person while making better exercise of the tool’s assets. Till now, Flutter didn’t toughen converse restoration and it was as soon as very subtle to attain it precisely with out framework toughen. That’s why we’re very happy with a concept to raise the foundational implementation of this option for Android.

Here’s a truly easy pattern for restoring the converse of the default Flutter Counter app:

In short, every widget will get a storage bucket, which is registered with the RestorationMixin the exercise of a abnormal ID. By the exercise of a RestorableProperty form (like RestorableInt mature right here) to store the UI-say details, and by registering that details with the Say Restoration feature, the guidelines is robotically saved forward of Android kills the app, and restored when it’s introduced again to lifestyles. And that’s it. Any details that’s saved in a Restoration* form, like RestorableInt, RestorableString and RestorableTextEditingController (we’ve got a bunch of them) shall be restored. And if we don’t conceal all of the styles you’d like to possess restored, that it is possible you’ll fetch your dangle by extending RestorableProperty.

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For computerized sorting out of converse restoration, we’ve added a sleek restartAndRestore API to WidgetTester. And to test manually, the finest disclose to attain is to delivery your converse restoration-enabled Flutter app on an Android tool, enable “Don’t preserve actions” in Android’s developer settings, speed your Flutter app, assign it into the background, and then return to it. At this point, Android may per chance possess killed and restored your app, so that it is possible you’ll peer if all the things is working as you assign a query to.

While we’re happy to position this preview model of Say Restoration on your palms, there’s more work to attain. As an illustration, converse restoration isn’t appropriate for Android, iOS apps would perhaps also profit as successfully. Furthermore, we’re busy updating our dangle widgets to preserve their converse at some stage in restoration. We’ve already supplied toughen in the Scrollable classes like ListView and SingleChildScrollView (to endure in suggestions the person’s scroll put) and TextFields (to revive the text they’ve entered), and we thought to elongate that to other widgets.

On the different hand, the principal restoration toughen we have no longer yet added, and what makes this a preview release, is navigation (both 1.0 or 2.0). This form that the put your person is in the app won’t be restored. That feature shall be coming to a beta rapidly and to the next steady release of Flutter.

Working with our interior Google partners, the Flutter crew has critically improved the efficiency of scrolling when the input and the divulge frequencies are no longer the same. As an illustration, the Pixel 4 input runs at 120hz whereas the divulge runs at 90hz. This mismatch can motive a efficiency penalty when scrolling. With a sleek resamplingEnabled flag, that it is possible you’ll capture profit of the efficiency work we’ve done in Flutter to cope with this disclose:

Counting on the frequency discrepancies enthusiastic, it is possible you’ll most certainly also peer up to 97% much less jank in scrolling by enabling this flag. When we’re sure right here’s the finest expertise, we thought to enable this flag by default in a future fetch.

As consistently, an update to Flutter doesn’t appropriate mean the engine and the framework however the tooling as successfully. Flutter 1.22 incorporates a sleek model of Streak (2.10), and there’s a sleek trudge CLI tool that it is possible you’ll most certainly also fetch important as successfully.

Streak historically has had many smaller developer instruments (similar to dartfmt for formatting, and dartanalyzer for code evaluation). Unique in Streak 2.10 is a unified trudge developer tool deal just like the flutter tool.

Screenshot of the output of `dart help`.

Screenshot of the output of `dart help`.

Beginning with as of late’s Flutter 1.22 SDK, it is possible you’ll fetch that the /bin folder (which you seemingly possess on yourPATH) contains both flutter and trudge commands. For more small print, peer the Streak 2.10 weblog post.

The tooling launched as segment of Flutter 1.22 incorporates a sleek output dimension evaluation utility. This tool helps diagnose Flutter whether the breakdown of your app’s dimension modifications over time.

You may exercise the tool to amass the guidelines well-known for evaluation by passing an--analyze-dimension flag to any of the next commands:

  • flutter fetch apk
  • flutter fetch appbundle
  • flutter fetch ios
  • flutter fetch linux
  • flutter fetch macos
  • flutter fetch home windows

The exercise of this flag while constructing a Flutter output artifact prints a summary of the artifact’s dimension and composition. This includes native code, assets, and even a equipment-level breakdown of compiled Streak code.

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Instance breakdown of the Flutter Gallery’s release APK

This summary is effective in mercurial identifying hotspots in the applying’s equipment dimension usage. As successfully as, the gathered details shall be on hand as a JSON file for exercise in Streak DevTools, which helps you to further explore your app’s contents, pinpoint dimension points and peer modifications between two diverse JSON files by following the directions on flutter.dev. Whenever you load the JSON file, you’ll possess an interface that presents you a tree scheme look of your app’s dimension.

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An example APK breakdown in Streak DevTools

For more small print of the things that it is possible you’ll attain with the App Size tool, be taught the The exercise of the app dimension tool doctors on flutter.dev.

One other DevTools preview feature on this release is the flexibility to peer HTTP and HTTPs response bodies as segment of the Network tab.

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To enable this option, execute sure that that you’re on the Flutter dev channel by plan of flutter channel dev and flutter channel toughen.

As successfully as, for apps with a complete lot community traffic, we’ve supplied the flexibility to search and filter.

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For the Network tab doctors, peer The exercise of the Network Look on flutter.dev.

For a while now, we’ve been affirming two copies of some of our Flutter instruments, just like the Inspector pane in IntelliJ and the Inspector tab in Streak DevTools. No longer easiest does this slack us down attributable to we’ve got to preserve two codebases, but some parts haven’t yet made it into the IntelliJ plugin, just like the Structure Explorer. So, to resolve both of these concerns, we’ve enabled the flexibility to host the Inspector tab from Streak DevTools at as soon as inner of IntelliJ.

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Search for the addition of the Structure Explorer, which that it is possible you’ll exercise appropriate subsequent to your code. To toggle this possibility on, prance to Preferences > Languages & Frameworks > Flutter > Enable embedded DevTools inspector.

A well-liked task that every Flutter developers face is going from the error output in the terminal or in their stack traces. Within the latest release of the Flutter extension for Visual Studio Code, these links are in actuality successfully parsed so that you can enable links at as soon as from the output.

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It appears to be like like a small disclose, but preliminary feedback is already very inch on this option.

As consistently, there are too many tooling modifications checklist right here, but I like to recommend the next announcements for small print:

EasyA is a subscription app designed to present college-age college students fetch admission to to vivid tutors by plan of quick messaging, and is written in Flutter. No longer too prolonged ago it was as soon as featured by Apple as their App of the Day.

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“When colleges began to prance browsing earlier this year, we knew we well-known to open our tutoring app mercurial to aid college students. The sheer tempo of pattern with Flutter meant we were ready to implement award-succesful designs for both iOS and Android, and likewise post to the glean — appropriate in time for lockdown! On the full, this may per chance had been practically unattainable. Nevertheless since Flutter permits us to heart of attention on all three platforms steady now, we were ready to portion code successfully and leverage our small crew of developers to the fullest.”

— Phil Kwok, Co-founder, EasyA

As consistently, we try to preserve the amount of breaking modifications to a minimum. Here’s the checklist from the Flutter 1.22 release.

The Flutter 1.22 steady release may per chance even possess reach mercurial on the heels of the outdated release, but there’s so noteworthy appropriate stuff in it that this post couldn’t point out all of it. We hope this release helps you fetch very fair appropriate apps for iOS and Android, and we are succesful of’t wait to peer what you’ve in store! Thanks to your toughen — we fetch Flutter for you.

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