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Relands https://github.com/flutter/flutter/pull/179647 There were only two failing tests (there were also two bringup failures, the `mac_arm64_mokey` versions of these) https://ci.chromium.org/ui/p/flutter/builders/prod/Mac_mokey%20run_release_test/3866/overview https://ci.chromium.org/ui/p/flutter/builders/prod/Mac_mokey%20run_debug_test_android/5454/overview They failed with the same logs ``` Task result: { "success": false, "reason": "Task failed: flutter run had unexpected output on standard error." } ``` The stderr in question: ``` [2025-12-15 14:06:56.311794] [STDOUT] run:stderr: - integration_test requires Android NDK 28.2.13676358 [2025-12-15 14:06:56.311989] [STDOUT] run:stderr: Fix this issue by using the highest Android NDK version (they are backward compatible). [2025-12-15 14:06:56.312019] [STDOUT] run:stderr: Add the following to /opt/s/w/ir/x/w/rc/tmpr6kj09d_/flutter sdk/dev/integration_tests/ui/android/app/build.gradle: [2025-12-15 14:06:56.312074] [STDOUT] run:stderr: [2025-12-15 14:06:56.312092] [STDOUT] run:stderr: android { [2025-12-15 14:06:56.312144] [STDOUT] run:stderr: ndkVersion = "28.2.13676358" [2025-12-15 14:06:56.312162] [STDOUT] run:stderr: ... [2025-12-15 14:06:56.312205] [STDOUT] run:stderr: } ``` We can just set the ndk version to `flutter.ndkVersion`, which is this value. It's also what is set in the templates, so it isn't a hack that doesn't represent a real flutter app. Verified the tests pass now with ``` ../../bin/cache/dart-sdk/bin/dart bin/test_runner.dart test -t run_release_test ../../bin/cache/dart-sdk/bin/dart bin/test_runner.dart test -t run_debug_test_android ``` ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. **Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the `gemini-code-assist` bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md --------- Co-authored-by: Gray Mackall <mackall@google.com>
Examples of Flutter's layered architecture
This directory contains several self-contained examples that illustrate Flutter's layered architecture.
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raw/ These examples show how to program against the lowest layer of the system. They manually receive input packets and construct composited scenes.
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rendering/ These examples use Flutter's render tree to structure your app using a retained tree of visual objects. These objects coordinate to determine their size and position on screen and to handle events.
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widgets/ These examples use Flutter's widgets to build more elaborate apps using a reactive framework.
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services/ These examples use services available in Flutter to interact with the host platform.
To run each example, specify the demo file on the flutter run
command line, for example:
flutter run raw/spinning_square.dart
flutter run rendering/spinning_square.dart
flutter run widgets/spinning_square.dart