Repository: flutter
Issue: [Desktop] Cannot tab out from a long ListView
Labels: c: new feature,framework,f: scrolling,c: proposal,a: desktop,f: focus,P2,team-framework,triaged-framework

It's hard to key-navigate Flutter UIs with long lists.

Flutter should offer a suitable focus action or a focus traversal group/policy to allow tab focus traversal to be configured as if `ListView` was a singular focus node, yet directional (up/down arrow) focus traversal would work inside the list view.

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## Steps to Reproduce

<!-- Please include full steps to reproduce so that we can reproduce the problem. -->

1. Run the attached example (add `scroll_to_index` as a dependency)
2. Try to use keyboard to reach the _Another Button_ at the bottom

**Expected results:** <!-- what did you want to see? -->

While tab-navigation works for shorter lists, there should be a way to configure focus traversal for long lists as such that:

`<TAB>` -> Another Button -> `<TAB>` -> One Button -> `<TAB>` -> 500 -> `<UP>` -> 499 -> `<DOWN>` -> 501 -> `<TAB>` -> Another Button -> ...

**Actual results:** <!-- what did you see? -->

The further down the list, the harder it gets to navigate out of the list.

<details>
<summary>Code sample</summary>

<!--
      Please create a minimal reproducible sample that shows the problem
      and attach it below between the lines with the backticks.

      To create it you can use `flutter create bug` command and update the `main.dart` file.

      Alternatively, you can use https://dartpad.dev/
      which is capable of creating and running small Flutter apps.

      Without this we will unlikely be able to progress on the issue, and because of that
      we regretfully will have to close it.
-->

```dart
import 'package:flutter/material.dart';
import 'package:scroll_to_index/scroll_to_index.dart';

void main() {
  runApp(const MaterialApp(home: MyHomePage()));
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final controller = AutoScrollController();

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance!.addPostFrameCallback((_) {
      controller.scrollToIndex(5000);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        children: [
          ElevatedButton(
            onPressed: () {},
            child: const Text('One Button'),
          ),
          Expanded(
            child: ListView.builder(
              controller: controller,
              itemBuilder: (BuildContext context, int index) {
                return AutoScrollTag(
                  index: index,
                  key: ValueKey(index),
                  controller: controller,
                  child: ListTile(
                    autofocus: index == 5000,
                    onTap: () {},
                    title: Text(index.toString()),
                  ),
                );
              },
            ),
          ),
          ElevatedButton(
            onPressed: () {},
            child: const Text('Another Button'),
          ),
        ],
      ),
    );
  }
}
```

</details>

<details>
  <summary>Logs</summary>

<!--
      Run your application with `flutter run --verbose` and attach all the
      log output below between the lines with the backticks. If there is an
      exception, please see if the error message includes enough information
      to explain how to solve the issue.
-->

```
[  +36 ms] executing: uname -m
[  +18 ms] Exit code 0 from: uname -m
[        ] x86_64
[   +3 ms] executing: [/home/jpnurmi/Flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[   +4 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[        ] 5fd1d36ecc6750302beebf73683d4a6977603abe
[        ] executing: [/home/jpnurmi/Flutter/] git tag --points-at 5fd1d36ecc6750302beebf73683d4a6977603abe
[  +10 ms] Exit code 0 from: git tag --points-at 5fd1d36ecc6750302beebf73683d4a6977603abe
[   +1 ms] executing: [/home/jpnurmi/Flutter/] git describe --match *.*.* --long --tags 5fd1d36ecc6750302beebf73683d4a6977603abe
[  +32 ms] Exit code 0 from: git describe --match *.*.* --long --tags 5fd1d36ecc6750302beebf73683d4a6977603abe
[        ] 2.6.0-11.0.pre-322-g5fd1d36ecc
[   +5 ms] executing: [/home/jpnurmi/Flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[   +4 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[        ] upstream/master
[        ] executing: [/home/jpnurmi/Flutter/] git ls-remote --get-url upstream
[   +5 ms] Exit code 0 from: git ls-remote --get-url upstream
[        ] https://github.com/flutter/flutter.git
[  +49 ms] Unable to locate an Android SDK.
[   +5 ms] executing: [/home/jpnurmi/Flutter/] git rev-parse --abbrev-ref HEAD
[   +3 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[        ] master
[  +32 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[   +1 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'WindowsUwpEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[  +41 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[        ] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'WindowsUwpEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[  +43 ms] Skipping pub get: version match.
[  +72 ms] Generating /home/jpnurmi/Temp/listview_traversal/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java
[  +55 ms] Initializing file store
[   +6 ms] Skipping target: gen_localizations
[   +4 ms] gen_dart_plugin_registrant: Starting due to {InvalidatedReasonKind.inputChanged: The following inputs have updated contents:
/home/jpnurmi/Temp/listview_traversal/.dart_tool/package_config_subset}
[  +16 ms] gen_dart_plugin_registrant: Complete
[        ] Skipping target: _composite
[   +1 ms] complete
[   +3 ms] Launching lib/main.dart on Linux in debug mode...
[   +3 ms] /home/jpnurmi/Flutter/bin/cache/dart-sdk/bin/dart --disable-dart-dev /home/jpnurmi/Flutter/bin/cache/artifacts/engine/linux-x64/frontend_server.dart.snapshot --sdk-root
/home/jpnurmi/Flutter/bin/cache/artifacts/engine/common/flutter_patched_sdk/ --incremental --target=flutter --debugger-module-names --experimental-emit-debug-metadata
-DFLUTTER_WEB_AUTO_DETECT=true --output-dill /tmp/flutter_tools.VKOSYU/flutter_tool.VYMQSR/app.dill --packages /home/jpnurmi/Temp/listview_traversal/.dart_tool/package_config.json
-Ddart.vm.profile=false -Ddart.vm.product=false --enable-asserts --track-widget-creation --filesystem-scheme org-dartlang-root --initialize-from-dill
build/c075001b96339384a97db4862b8ab8db.cache.dill.track.dill --flutter-widget-cache --enable-experiment=alternative-invalidation-strategy
[  +14 ms] Building Linux application...
[  +15 ms] <- compile package:listview_traversal/main.dart
[   +1 ms] executing: [build/linux/x64/debug/] cmake -G Ninja -DCMAKE_BUILD_TYPE=Debug -DFLUTTER_TARGET_PLATFORM=linux-x64 /home/jpnurmi/Temp/listview_traversal/linux
[  +28 ms] -- Configuring done
[   +1 ms] -- Generating done
[  +11 ms] -- Build files have been written to: /home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug
[   +6 ms] executing: ninja -C build/linux/x64/debug install
[  +11 ms] ninja: Entering directory `build/linux/x64/debug'
[+8362 ms] [1/5] Generating /home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/libflutter_linux_gtk.so,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_basic_message_channel.h,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_binary_codec.h,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_binary_messenger.h,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_dart_project.h, /home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_engine.h,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_json_message_codec.h,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_json_method_codec.h,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_message_codec.h,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_method_call.h,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_method_channel.h,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_method_codec.h,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_method_response.h,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_plugin_registrar.h,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_plugin_registry.h,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_standard_message_codec.h,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_standard_method_codec.h,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_string_codec.h, /home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_value.h,
/home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/fl_view.h, /home/jpnurmi/Temp/listview_traversal/linux/flutter/ephemeral/flutter_linux/flutter_linux.h,
_phony_
[   +1 ms] [  +38 ms] executing: uname -m
[        ] [  +19 ms] Exit code 0 from: uname -m
[        ] [        ] x86_64
[        ] [   +3 ms] executing: [/home/jpnurmi/Flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[        ] [   +3 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[        ] [        ] 5fd1d36ecc6750302beebf73683d4a6977603abe
[        ] [        ] executing: [/home/jpnurmi/Flutter/] git tag --points-at 5fd1d36ecc6750302beebf73683d4a6977603abe
[        ] [   +9 ms] Exit code 0 from: git tag --points-at 5fd1d36ecc6750302beebf73683d4a6977603abe
[        ] [   +1 ms] executing: [/home/jpnurmi/Flutter/] git describe --match *.*.* --long --tags 5fd1d36ecc6750302beebf73683d4a6977603abe
[        ] [  +24 ms] Exit code 0 from: git describe --match *.*.* --long --tags 5fd1d36ecc6750302beebf73683d4a6977603abe
[        ] [        ] 2.6.0-11.0.pre-322-g5fd1d36ecc
[        ] [   +5 ms] executing: [/home/jpnurmi/Flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[        ] [   +3 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[        ] [        ] upstream/master
[        ] [        ] executing: [/home/jpnurmi/Flutter/] git ls-remote --get-url upstream
[        ] [   +2 ms] Exit code 0 from: git ls-remote --get-url upstream
[        ] [        ] https://github.com/flutter/flutter.git
[        ] [  +29 ms] Unable to locate an Android SDK.
[        ] [   +4 ms] executing: [/home/jpnurmi/Flutter/] git rev-parse --abbrev-ref HEAD
[        ] [   +2 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[        ] [        ] master
[        ] [  +30 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[        ] [   +1 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'WindowsUwpEngineArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[        ] [  +52 ms] Artifact Instance of 'MaterialFonts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'GradleWrapper' is not required, skipping update.
[        ] [        ] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[        ] [        ] Artifact Instance of 'FlutterSdk' is not required, skipping update.
[        ] [        ] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'WindowsUwpEngineArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[        ] [        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'FontSubsetArtifacts' is not required, skipping update.
[        ] [        ] Artifact Instance of 'PubDependencies' is not required, skipping update.
[        ] [  +21 ms] Initializing file store
[        ] [  +11 ms] Skipping target: gen_localizations
[        ] [   +7 ms] gen_dart_plugin_registrant: Starting due to {InvalidatedReasonKind.inputChanged: The following inputs have updated contents:
/home/jpnurmi/Temp/listview_traversal/.dart_tool/package_config_subset}
[        ] [   +2 ms] unpack_linux: Starting due to {}
[        ] [  +41 ms] unpack_linux: Complete
[        ] [ +414 ms] gen_dart_plugin_registrant: Complete
[        ] [        ] kernel_snapshot: Starting due to {}
[        ] [   +4 ms] /home/jpnurmi/Flutter/bin/cache/dart-sdk/bin/dart --disable-dart-dev /home/jpnurmi/Flutter/bin/cache/artifacts/engine/linux-x64/frontend_server.dart.snapshot
--sdk-root /home/jpnurmi/Flutter/bin/cache/artifacts/engine/common/flutter_patched_sdk/ --target=flutter --no-print-incremental-dependencies -DFLUTTER_WEB_AUTO_DETECT=true
-Ddart.vm.profile=false -Ddart.vm.product=false --enable-asserts --track-widget-creation --packages /home/jpnurmi/Temp/listview_traversal/.dart_tool/package_config.json --output-dill
/home/jpnurmi/Temp/listview_traversal/.dart_tool/flutter_build/628d990376ce8326de01b8a16f910999/app.dill --depfile
/home/jpnurmi/Temp/listview_traversal/.dart_tool/flutter_build/628d990376ce8326de01b8a16f910999/kernel_snapshot.d package:listview_traversal/main.dart
[        ] [+6436 ms] kernel_snapshot: Complete
[        ] [ +282 ms] debug_bundle_linux-x64_assets: Starting due to {}
[        ] [  +93 ms] debug_bundle_linux-x64_assets: Complete
[        ] [ +372 ms] Persisting file store
[        ] [   +4 ms] Done persisting file store
[        ] [   +3 ms] build succeeded.
[        ] [   +4 ms] "flutter assemble" took 7,766ms.
[        ] [  +70 ms] ensureAnalyticsSent: 68ms
[        ] [   +2 ms] Running shutdown hooks
[        ] [        ] Shutdown hooks complete
[        ] [        ] exiting with code 0
[ +369 ms] [2/5] Building CXX object CMakeFiles/listview_traversal.dir/my_application.cc.o
[   +7 ms] [3/5] Building CXX object CMakeFiles/listview_traversal.dir/flutter/generated_plugin_registrant.cc.o
[ +118 ms] [4/5] Linking CXX executable intermediates_do_not_run/listview_traversal
[        ] [4/5] Install the project...
[   +4 ms] -- Install configuration: "Debug"
[   +3 ms] -- Installing: /home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug/bundle/listview_traversal
[        ] -- Set runtime path of "/home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug/bundle/listview_traversal" to "$ORIGIN/lib"
[        ] -- Installing: /home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug/bundle/data/icudtl.dat
[        ] -- Installing: /home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug/bundle/lib/libflutter_linux_gtk.so
[  +38 ms] -- Installing: /home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug/bundle/data/flutter_assets
[        ] -- Installing: /home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug/bundle/data/flutter_assets/version.json
[        ] -- Installing: /home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug/bundle/data/flutter_assets/packages
[        ] -- Installing: /home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug/bundle/data/flutter_assets/packages/cupertino_icons
[        ] -- Installing: /home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug/bundle/data/flutter_assets/packages/cupertino_icons/assets
[        ] -- Installing: /home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug/bundle/data/flutter_assets/packages/cupertino_icons/assets/CupertinoIcons.ttf
[        ] -- Installing: /home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug/bundle/data/flutter_assets/NOTICES.Z
[        ] -- Installing: /home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug/bundle/data/flutter_assets/fonts
[        ] -- Installing: /home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug/bundle/data/flutter_assets/fonts/MaterialIcons-Regular.otf
[        ] -- Installing: /home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug/bundle/data/flutter_assets/kernel_blob.bin
[  +40 ms] -- Installing: /home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug/bundle/data/flutter_assets/FontManifest.json
[        ] -- Installing: /home/jpnurmi/Temp/listview_traversal/build/linux/x64/debug/bundle/data/flutter_assets/AssetManifest.json
[   +7 ms] Building Linux application... (completed in 9.0s)
[ +197 ms] Observatory URL on device: http://127.0.0.1:42751/mZ5FBI1C008=/
[   +3 ms] Caching compiled dill
[  +32 ms] Connecting to service protocol: http://127.0.0.1:42751/mZ5FBI1C008=/
[ +119 ms] Launching a Dart Developer Service (DDS) instance at http://127.0.0.1:0, connecting to VM service at http://127.0.0.1:42751/mZ5FBI1C008=/.
[  +76 ms] DDS is listening at http://127.0.0.1:37997/TQnsr4L5ifg=/.
[  +35 ms] Successfully connected to service protocol: http://127.0.0.1:42751/mZ5FBI1C008=/
[  +27 ms] DevFS: Creating new filesystem on the device (null)
[  +12 ms] DevFS: Created new filesystem on the device (file:///tmp/listview_traversalZGLVBQ/listview_traversal/)
[   +3 ms] Updating assets
[  +68 ms] Syncing files to device Linux...
[   +1 ms] <- reset
[        ] Compiling dart to kernel with 0 updated files
[   +2 ms] <- recompile package:listview_traversal/main.dart d4d74dda-e208-44f2-9502-69fc0849b23d
[        ] <- d4d74dda-e208-44f2-9502-69fc0849b23d
[  +56 ms] Updating files.
[        ] DevFS: Sync finished
[        ] Syncing files to device Linux... (completed in 60ms)
[        ] Synced 0.0MB.
[   +1 ms] <- accept
[   +4 ms] Connected to _flutterView/0x2942900.
[   +1 ms] Flutter run key commands.
[        ] r Hot reload. 🔥🔥🔥
[        ] R Hot restart.
[        ] h List all available interactive commands.
[        ] d Detach (terminate "flutter run" but leave application running).
[        ] c Clear the screen
[        ] q Quit (terminate the application on the device).
[        ] 💪 Running with sound null safety 💪
[        ] An Observatory debugger and profiler on Linux is available at: http://127.0.0.1:37997/TQnsr4L5ifg=/
[ +286 ms] The Flutter DevTools debugger and profiler on Linux is available at: http://127.0.0.1:9101?uri=http://127.0.0.1:37997/TQnsr4L5ifg=/
```

<!--
     Run `flutter analyze` and attach any output of that command below.
     If there are any analysis errors, try resolving them before filing this issue.
-->

```
Analyzing listview_traversal...                                         
No issues found! (ran in 0.8s)
```

<!-- Finally, paste the output of running `flutter doctor -v` here. -->

```
[✓] Flutter (Channel master, 2.6.0-12.0.pre.322, on Ubuntu 21.10 5.13.0-16-generic, locale en_US.UTF-8)
    • Flutter version 2.6.0-12.0.pre.322 at /home/jpnurmi/Flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 5fd1d36ecc (4 hours ago), 2021-10-13 10:44:55 +0100
    • Engine revision da5bd05854
    • Dart version 2.15.0 (build 2.15.0-208.0.dev)

[✗] Android toolchain - develop for Android devices
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/docs/get-started/install/linux#android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.


[✓] Linux toolchain - develop for Linux desktop
    • Ubuntu clang version 13.0.0-2
    • cmake version 3.18.4
    • ninja version 1.10.1
    • pkg-config version 0.29.2

[!] Android Studio (not installed)
    • Android Studio not found; download from https://developer.android.com/studio/index.html
      (or visit https://flutter.dev/docs/get-started/install/linux#android-setup for detailed instructions).

[✓] VS Code
    • VS Code at /snap/code/current
    • Flutter extension version 3.27.0

[✓] Connected device (1 available)
    • Linux (desktop) • linux • linux-x64 • Ubuntu 21.10 5.13.0-16-generic

! Doctor found issues in 2 categories.
```

</details>


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