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[AGP 9] Add Unsupported AGP Version Functionality - #193609

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jesswrd:unsupported-major-agp-vers
Oct 3, 2026
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jesswrd:unsupported-major-agp-vers

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@jesswrd

@jesswrd jesswrd commented Sep 30, 2026 •

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Intentionally break builds that use unsupported (too new) AGP versions. This is in the event AGP releases a new AGP version we do not yet support.

Fixes #193593

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@jesswrd
jesswrd requested a review from a team as a code owner September 30, 2026 23:42
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jesswrd requested review from gmackall and removed request for a team September 30, 2026 23:42
@flutter-dashboard flutter-dashboard Bot added the CICD Run CI/CD label Sep 30, 2026
@github-actions github-actions Bot added platform-android Android applications specifically tool Affects the "flutter" command-line tool. See also t: labels. team-android Owned by Android platform team labels Sep 30, 2026

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Code Review

This pull request introduces a mechanism to validate Android Gradle Plugin (AGP) versions, ensuring that projects using unsupported major versions fail with a clear error message. It adds a new configuration property 'firstUnsupportedAGPMajorVersion' to 'DependencyVersionChecker', integrates this check into the 'FlutterPlugin' application flow, and provides comprehensive unit tests to verify the validation logic and error handling. A high-severity issue was identified regarding unsafe type casting of project properties, which requires a fix to prevent potential runtime exceptions.

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jesswrd removed the request for review from gmackall September 30, 2026 23:45
@jesswrd
jesswrd force-pushed the unsupported-major-agp-vers branch from c83ac0f to 212a106 Compare October 1, 2026 18:57
Flutter does not support Android Gradle Plugin 10 yet. Fail the build with
an actionable message when the project's AGP major version is
firstUnsupportedAGPMajorVersion (10) or newer, telling the developer to
downgrade AGP. The check lives in DependencyVersionChecker.checkAGPVersion
next to the existing lower bounds, so it shares the existing call site and
the --android-skip-build-dependency-validation bypass.
@jesswrd
jesswrd force-pushed the unsupported-major-agp-vers branch from 212a106 to 0c7404d Compare October 1, 2026 21:15
@github-actions github-actions Bot removed the team-android Owned by Android platform team label Oct 1, 2026
@jesswrd
jesswrd requested review from gmackall and mboetger October 2, 2026 19:18
"\nAlternatively, use the flag \"--android-skip-build-dependency-validation\"" +
" to bypass this check.\n\nPotential fix: $potentialFix"

@VisibleForTesting internal fun getUnsupportedMajorVersionErrorMessage(

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nit: getFutureUnsupportedMajorVersionErrorMessage

There are older Major Versions we probably don't support, right?

@jesswrd jesswrd Oct 2, 2026 •

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Older major versions are already handled by the existing minimum version check. Anything below errorAGPVersion (currently 8.11.1) fails here in checkAGPVersion. That path logs a different error message, from getErrorMessage.

I will rename getUnsupportedMajorVersionErrorMessage to getFutureUnsupportedMajorVersionErrorMessage to make that clearer.

mboetger
mboetger previously approved these changes Oct 2, 2026
@jesswrd jesswrd added the autosubmit Merge PR when tree becomes green via auto submit App label Oct 2, 2026
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auto-submit Bot added this pull request to the merge queue Oct 2, 2026
Merged via the queue into flutter:master with commit c035b6f Oct 3, 2026
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@flutter-dashboard flutter-dashboard Bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Oct 3, 2026
andywolff pushed a commit to jwinarske/flutter that referenced this pull request Oct 7, 2026
`useNewAgpDslErrorHandler` matched any line containing "> Failed to
apply plugin 'dev.flutter.flutter-gradle-plugin'". Gradle prints that
line for every exception thrown while applying the Flutter Gradle
plugin, so the android.newDsl Flutter Fix box was also shown for
unrelated failures such as unsupported Gradle, Java, AGP, or KGP version
errors.

The handler now only matches the "> java.lang.NullPointerException (no
error message)" line that is specific to the new DSL failure. Also
renames the handler's test, which duplicated the kotlin-android test
name, and adds matcher tests.

Fixes flutter#193865
Related to flutter#193609
Related to flutter#193593

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suryaKommana2662 pushed a commit to suryaKommana2662/flutter that referenced this pull request Oct 29, 2026
Intentionally break builds that use unsupported (too new) AGP versions.
This is in the event AGP releases a new AGP version we do not yet
support.

Fixes flutter#193593

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [AI contribution guidelines] and understand my
responsibilities, or I am not using AI tools.
- [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 in-code documentation (doc comments with
`///`).
- [x] If this PR introduces a new feature or capability, I created and
linked a website documentation issue or PR in [flutter/website] (or
verified none is needed).
- [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].

If this change needs to override an active code freeze, provide a
comment explaining why. The code freeze workflow can be overridden by
code reviewers. See pinned issues for any active code freezes with
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suryaKommana2662 pushed a commit to suryaKommana2662/flutter that referenced this pull request Oct 29, 2026
`useNewAgpDslErrorHandler` matched any line containing "> Failed to
apply plugin 'dev.flutter.flutter-gradle-plugin'". Gradle prints that
line for every exception thrown while applying the Flutter Gradle
plugin, so the android.newDsl Flutter Fix box was also shown for
unrelated failures such as unsupported Gradle, Java, AGP, or KGP version
errors.

The handler now only matches the "> java.lang.NullPointerException (no
error message)" line that is specific to the new DSL failure. Also
renames the handler's test, which duplicated the kotlin-android test
name, and adds matcher tests.

Fixes flutter#193865
Related to flutter#193609
Related to flutter#193593

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [AI contribution guidelines] and understand my
responsibilities, or I am not using AI tools.
- [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 in-code documentation (doc comments with
`///`).
- [x] If this PR introduces a new feature or capability, I created and
linked a website documentation issue or PR in [flutter/website] (or
verified none is needed).
- [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].

If this change needs to override an active code freeze, provide a
comment explaining why. The code freeze workflow can be overridden by
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guidance.

**Note**: The Flutter team is currently trialing the use of [Gemini Code
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Comments from the `gemini-code-assist` bot should not be taken as
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[Features we expect every widget to implement]:
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[AGP 9] Add in preemptive log about not using AGP 10 until supported

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