$ flutter build aar
AARs can only be built for plugin or module projects.

@stuartmorgan What is the add2app story for standalone Dart packages for Android? Is it not supported? (Packages with native assets are plain old Dart packages with a build.dart.)

And, who should review this PR besides you.

Note: for now this is just a draft. Linux need to be relanded, and also Windows needs to be landed first. I'm making a draft so I can run tests on the CI and have a place to ask questions.

@stuartmorgan What is the add2app story for standalone Dart packages for Android?

I don't have any familiarity with Android add-to-app, so I don't know the answer to this.

And, who should review this PR besides you.

@reidbaker probably

[ +1 ms] [ +2 ms] Target native_assets failed: Exception: No NDK found in LocalDirectory: '/b/s/w/ir/cache/android/sdk'

[ +1 ms] [ +3 ms] Target native_assets failed: Exception: No NDK found in LocalDirectory: 'C:\b\s\w\ir\cache\android\sdk'

It looks like we have no NDK on the Windows and Linux bots, we do have an NDK on the MacOS bots.

I don't see a mention of the NDK .ci.yaml, so I assume it's embedded inside the CIPD package for the android_sdk?

(The failing tests succeed locally on my Linux and Windows machines where the NDK is installed.)

@stuartmorgan How do we get the NDK on the bots?

I was thinking we should have had it already, because the FFI plugins for Android use it. But it likely gets auto-downloaded there by Gradle. With the FFI packages, we don't have a gradle file that does that. Maybe we could consider generating such a file if we notice there is at least one package with a build.dart?

@stuartmorgan How do we get the NDK on the bots?

That's probably a question for @reidbaker.

@johnmccutchan As Reid is pretty busy, might you be able to take a look at the questions above and the general approach in this PR?

@stuartmorgan IIRC you reviewed some of the other PRs on this project. Would you be able to review/confirm that this PR comports with the other changes that have been landed, at least at a surface level?

@christopherfujino for flutter_tool review.

How do we get the NDK on the bots?

@godofredoc Can we get the NDK pre-installed on the Windows and Linux bots? "Linux tool_integration_tests_3_4" and "Windows tool_integration_tests_5_6" fail because there is no Android NDK inside the used Android SDK on those bots.