2948917a47
Relands https://github.com/flutter/flutter/pull/159756. The original caused some stderr because 1. the configurable `ndkVersion` value that AGP provides used to be null by default. 2. Now it is not, instead it has a default value 3. `integration_test` doesn't actually use the NDK, but default for `integration_test` was higher that `flutter.ndkVersion` 4. We have code that checks if a plugin uses a higher ndk version and tells you to consider upgrading https://github.com/flutter/flutter/blob/master/packages/flutter_tools/gradle/src/main/groovy/flutter.groovy#L921 This reverts the revert, and then aligns `integration_test`'s NDK version (which again, it doesn't actually use, so I'm not too concerned about the downgrade) with `flutter.ndkVersion`. It also starts using the `flutter.min/compile/ndkVersion` values in `integration_test`, which was unrelated to the original pr. Can remove if you think it should land separately. ## 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]. - [ ] 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. - [ ] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. <!-- 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