Flutter 2.10 update details

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Flutter 2.10 Version has been officially released ！ although ⾃ Last stable release Since then 不 To two ⽉, Even in such a short time ,Flutter The official has also handled and closed 1843 individual Issue, Merged to ⾃ The global 155 Of contributors 1525 individual PR.

Flutter 2.10 Include Flutter Yes Windows ⽀ Hold the weight ⼤更 new 、⼏ Item weight ⼤ Performance improvement of 、 Icons and colors in the frame ⾊ The new ⽀ Hold and some ⼯ With improvement, etc . Besides , This version also includes the removal of dev Channel 更 new 、 Reduce the need for older versions iOS Of ⽀ And a few brief disruptive changes . Next let's Flutter Take a look at Flutter 2.10 Update of ：

Use Flutter structure Windows Desktop application support has entered a stable stage

⾸ First ,Flutter 2.10 Version brings stable Windows ⽀ a , There is no need to pass --enable-windows-desktop Tag to configure separately Windows Desktop application support , Because it is now enabled by default ！

Of course , The release of this stable version is definitely not just “ Delete ” A tag is so simple ;-) stay Flutter 2.10 Of Windows Supporting , It also includes the right ⽂ Office 理、 At the keyboard 理 And keyboard shortcuts ⼴ Pan improvement , And directly with Windows A new way of integration 、⽀ Hold the command line parameter 、 Globalization ⽂ Ben lost ⼊ And accessibility .

of Windows The stable version is released 更 Multiple information , You can read 《Flutter for Windows Desktop stable release 》, The article details Flutter stay Windows Architecture on the Internet , It also shows how many Flutter package And plug-ins have ⽀ a Windows. You can also see Flutter Of ⼯ With and should ⽤ Partners in Windows Superior emissary ⽤ Flutter Made some ⽰ E.g .

Engine performance improvement

This version of the Flutter Including by community members knopp Provided Draw the dirty area tube 理 A preliminary study of ⽀ a , He is iOS/Metal A single dirty area on the ⽤ Selective redrawing . This change reduces the rasterization time of the ninetieth and ninetieth percentiles in some benchmarks by an order of magnitude , And put... In these benchmarks GPU benefit ⽤ Rate from 90% That's down to 10% following .

Flutter Hopefully in future versions , Introduce the advantages of selective redrawing to other platforms .

stay Flitter 2.8 In the version ,Flutter Get your own internal picture recording format . Now in Flatter 2.10 in ,Flutter It has been used for optimization . for example , A common case of opaque layers can now be implemented more effectively . Even in the worst case ,Flutter The frame grating time in the benchmark also fell to less than one third of the previous value .

With Flutter Continue to develop record formats , The optimization will continue to be extended to more scenarios in the future .

stay profile and release In mode ,Dart The code will be in AOT How to compile . The key to the lightness and efficiency of this code comes from the type flow analysis of the whole program , It unlocks many compiler optimizations and radical shake tree optimizations (tree-shaking). But since type flow analysis must cover the whole program , Therefore, there may be some performance consumption . The new version brings 更 Fast type flow analysis implementation . stay Flutter The benchmark of ,Flutter Should be ⽤ The overall build time has decreased by about 10%.

As usual , Performance enhancements 、 Reducing memory makes ⽤ And reducing latency is Flutter Team ⾸ To task . Look forward to further improvements in future versions .

Android Platform update

Flutter 2.10 The version also contains many for Android Platform improvements . Now by default , When you create a new should ⽤ when ,Flutter Default ⽀ Hold the latest version of Android, namely Android 12（API Level 31）. Besides , In this release ,Flutter Qi ⽤ 了 multidex ⾃ dynamic ⽀ a . If your should ⽤⽀ Hold below 21 Of Android SDK edition , And more than 64K Of dex ⽅ Normal number limit , Just put the --multidex Parameter passed to flutter build appbundle or flutter build apk command , Your answer ⽤ Will increase multidex Of ⽀ a .

Last , stay Flutter Received developers' comments on Gradle After throwing feedback with a puzzling error message ,Flutter Adjust the Flutter Command line tools , Now it will As usual ⻅ Provide solutions to problems . for example , If you answer to your ⽤ Added a plug-in , The plug-in needs your attention ⾼ Minimum supported Android SDK edition , You will now see in the error message 「Flutter Fix」 The advice of .

Flutter Will continue as usual ⻅ Error message added 更 Suggestions for multiple solutions , And hope to get your feedback on other error messages , These error messages will significantly help developers deal with similar problems .

iOS platform 更 new

In addition to performance improvements ,Flutter Some platform specific functions have also been added and enhanced .luckysmg for Flutter Brings a iOS New enhancements on ——更 Smooth keyboard animation , It will ⾃ Dynamic application in your application .

in addition to ,Flutter Also by repairing some The edge situation collapse ⾼ 了 iOS Camera plug-in stability .

Last ,Flutter by 64 Bit structured iOS The system adds memory reduction to make ⽤ New functions ： Compression pointer .

64 Bit schema will pointer to table ⽰ by 4 Byte size data structure . When you have a lot of objects , Pointer book ⾝ Occupy ⽤ The space will increase ⽤ Overall memory footprint , Especially if you should ⽤ When it's bigger and more complex , These should ⽤ Yes 更 Much of the GC shake . However ,iOS Should be ⽤不 It is unlikely that ⾜ Enough objects to occupy ⽤ Most of 32 Bit address space （20 Billion objects ）,更不⽤ Say Pang ⼤ Of 64 Bit address space （900 Billion objects ） 了 .

Dart 2.15 The function of compressing pointers is introduced in , In this release Flutter In the version ,Flutter send ⽤ This feature reduces 64 position iOS Should be ⽤ Memory makes ⽤ The amount .

Web Platform update

This version also includes a pair of Web Some improvements to the platform . for example , In previous versions , When you drag the mouse to the edge of the multiline text box , it 不 Will follow the scroll correctly . In this release , When the selection cursor is dragged out of the text box , The text box scrolls , Browse and select the corresponding text content . This behavior also applies to ⽤ On Web Platforms and tables ⾯ End .

Flutter 2.10 It also includes right Web Another significant improvement of the platform ,Flutter Has also been seeking to reduce Flutter The application runs to Web Platform overhead , In previous versions , Every time Flutter Want to put the original ⽣ HTML Of widget lead ⼊ Flutter Should be ⽤ when ,Flutter Need a covering layer (Overlay) As Flutter Yes Web View of the platform (Platform view) ⽀ Part of holding . Each of these stacks ⽀ a ⾃ Define drawing , But it also represents a certain amount of performance overhead . If you should ⽤ There is ⼤ Quangen ⽣ HTML Of widget ( For example, links ), Then this will cause a very large performance overhead . In this version Flutter by Web The platform builds a new 「⾮ Drawn platform view 」, This overhead has been basically eliminated .Flutter already This optimization Applied to the Link widget in , This means that if your Flutter Web Should be ⽤ There is ⼤ Quantity of links , They will no longer incur additional performance consumption . as time goes on ,Flutter Will optimize this to ⽤ To the others widget.

Material 3

This version is directed to Material 3 The beginning of the transition , These include From a single species ⼦ Yan ⾊⽣ Into a whole match ⾊⽅ case The ability of .

You can use any color to create new ColorScheme type ：

final lightScheme = ColorScheme.fromSeed(seedColor: Colors.green);
final darkScheme = ColorScheme.fromSeed(seedColor: Colors.green, brightness: Brightness.dark);

ThemeData There is also a new constructor for colorSchemeSeed Parameters , Can be directly from the color ⽣ A themed match ⾊⽅ case ：

final lightTheme = ThemeData(colorSchemeSeed: Colors.orange, ...); 
final darkTheme = ThemeData(colorSchemeSeed: Colors.orange, brightness: Brightness.dark, ...); 

Besides , This version includes ThemeData.useMaterial3 Parameters of , It can be widget Switch to new Material 3 appearance .

Last ,Flutter Added 1028 A new one Material Icon .

You can This issue in To follow up Material 3 The access situation of , And leave your feedback at any time .

Integration test improvement

2020 年 12 ⽉,Flutter Announced to make ⽤ integration_test New for end-to-end testing ⽅ Law , View Chinese documents Introduction to integration testing Learn more about . This new package To replace the flutter_driver As a recommendation for integration testing ⽅ type , New features are available , Such as Firebase Test lab ⽀ Hold on to Web And the table ⾯ Of ⽀ a .

From then on ,Flutter Further improvements have been made to integration testing , Include take integration_test package Built in Flutter SDK in , Make it 更 Rong 易 With your response ⽤ Integrate . Now? ,Flutter Wrote a new migration guide , To help you from flutter_driver Test migration to integration_test.

The existing ⽂ files 、 Example and codelab Has also been targeted at integration_test the 更 new . If you are not already in Flutter Should be ⽤ Superior emissary ⽤ integration_test, So from now on ！

DevTools

In this version ,Flutter Also in the Flutter DevTools Some improvements have been made in ⼯ do , Including making... Directly from the command line ⽤ DevTools Simple function of . Now you ⽆ Need to use ⽤ pub global activate To download and run the latest version of devtools, Simply ⽤ dart devtools Get in touch with what you're making ⽤ Of Flutter The latest version with the same version can .

Flutter And a little bit of can ⽤ sex 更 new , Include Improved checking in debugger variables pane ⼤ Type list and mapping Of ⽀ a （ thank Elliott）.

Last ,Flutter Upcoming release 年 degree DevTools The questionnaire survey ！ Please provide your feedback and help Flutter Improve your development experience .

VSCode improvement

Flutter Of Visual Studio Code The extension has also received many enhancements , Include In the code of 更 Multi position preview color as well as The color code can be updated ⾊ Selectors .

Besides , If you want to be VSCode Of Dart and Flutter Testing of extended pre release versions ⼈ member , You can Switch to the pre release version in your extended settings .

You can flutter-announce Of the mailing list This article Read about this 更 New details .

remove dev Release channel

stay Flutter 2.8 In the version ,Flutter announce Flutter Trying to remove dev Release channel , To simplify your choices and reduce research and development costs . In this version ,Flutter This has been done ⼯ do , Include ：

• 更 new Flutter ⼯ To help develop ⼈ Members move out of the development channel
• 更 new wiki Description and commitment of each channel
• 更 New abandon ⽤ policy
• from DartPad、 Pre delivery test and ⽹ Delete... From the station dev Channel ⽀ a

Dev The channel has now been completely removed . If Flutter Some positions that have not been removed are missing , Please let me know Flutter.

Yes iOS 9.3.6 Of ⽀ Hold on to the end

because Flutter In the laboratory ⽬ Use of the subject equipment ⽤ Reduce and increase the difficulty of maintenance ,Flutter is Adjust for iOS 9.3.6 Support for , from 「⽀ a 」 To 「 try the best ⽽ by 」. This means that iOS 9.3.6 Of ⽀ Hold peace with 32 position iOS The equipment ⽀ Holding will only be through coding practice 、Ad-Hoc And community testing to maintain .

Flutter Due in 2022 年 In the third quarter Flutter Abandoned in stable version 32 position iOS Equipment and iOS edition 9 and 10 Of ⽀ a . This means based on stable Flutter SDK Constructed stress ⽤ take 不 And then 32 position iOS Run on device , also Flutter ⽀ Hold the lowest iOS The version will be added to iOS 11.

Disruptive changes

Flutter We also try to reduce destructive changes in each version and this version , Even though Flutter It hasn't been completely zeroed , but Flutter Will continue to work hard ！

If you are still making ⽤ these API, You can read flutter.dev Migration guide on . As always, ,⾮ Often thank the community for contributing to the test , help Flutter Identify these disruptive changes .