Add ability to access plugins from other plugins by fuzzybinary · Pull Request #182753 · flutter/flutter

fuzzybinary · 2026-02-23T13:02:00Z

Plugins occasionally need to communicate with other native plugins.

On iOS, plugins are able to publish values that should be accessible to other plugins. The easiest way to allow to these published value is to add an accessor in FlutterPluginRegistrar, similar to the one that exists in FlutterPluginRegistry (valuePublishedByPlugin).

On Android, we can ask for the plugin class directly by added and accessor to FlutterPluginBinding called getPlugin, which delegates to the engine's FlutterPlugins.

Fixes #121527

Pre-launch Checklist

I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
I read the [Tree Hygiene] wiki page, which explains my responsibilities.
I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement].
I signed the [CLA].
I listed at least one issue that this PR fixes in the description above.
I updated/added relevant documentation (doc comments with ///).
I added new tests to check the change I am making, or this PR is [test-exempt].
I followed the [breaking change policy] and added [Data Driven Fixes] where supported.
All existing and new tests are passing.

flutter-dashboard · 2026-02-23T13:02:04Z

It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging.

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing. If you believe this PR qualifies for a test exemption, contact "@test-exemption-reviewer" in the #hackers channel in Discord (don't just cc them here, they won't see it!). The test exemption team is a small volunteer group, so all reviewers should feel empowered to ask for tests, without delegating that responsibility entirely to the test exemption group.

gemini-code-assist

Code Review

The pull request introduces valuePublishedByPlugin to FlutterPluginRegistrar, allowing plugins to access values published by other plugins. This change is implemented in FlutterPlugin.h and FlutterEngine.mm. The changes are straightforward, adding the method declaration and its implementation, and seem to align with the stated objective of fixing issue #121527.

Fixes flutter#121527

hellohuanlin

You added android tests, but not iOS tests

fuzzybinary · 2026-02-25T13:22:02Z

👍 I'll go back and add an iOS test. There was an obvious place to add it on Android. I didn't see one on iOS, but I'll add it.

fuzzybinary · 2026-02-25T15:47:29Z

Added tests for valuePublishedByPlugin to FlutterEngineTests.mm. Sorry for missing it on the first pass!

hellohuanlin

ios part looks good.

hellohuanlin · 2026-02-25T22:17:54Z

    }

+    @Nullable
+    public FlutterPlugin getPlugin(@NonNull Class<? extends FlutterPlugin> pluginClass) {


missing doc comment

reidbaker

Approve % public doc.

@mboetger I think this pr is a good idea are there any issues it causes us migrating to the embedder api?

reidbaker · 2026-02-26T15:07:19Z

    }

+    @Nullable
+    public FlutterPlugin getPlugin(@NonNull Class<? extends FlutterPlugin> pluginClass) {


reidbaker · 2026-02-26T15:11:30Z

The failing code in google 3 is real but most look like Fakes where we need to add an implementation.

vashworth · 2026-02-26T22:30:25Z

From triage: @hellohuanlin Can you make a g3fix?

fuzzybinary · 2026-02-27T10:24:55Z

Doc comment added. Thanks everyone!

hellohuanlin · 2026-03-04T18:07:41Z

G3 fix is in. Running test again.

hellohuanlin · 2026-03-06T19:34:12Z

G3 fix is approved. re-running.

…lutter#182753)

Plugins occasionally need to communicate with other native plugins. On iOS, plugins are able to publish values that should be accessible to other plugins. The easiest way to allow to these published value is to add an accessor in FlutterPluginRegistrar, similar to the one that exists in FlutterPluginRegistry (valuePublishedByPlugin). On Android, we can ask for the plugin class directly by added and accessor to `FlutterPluginBinding` called `getPlugin`, which delegates to the engine's `FlutterPlugins`. Fixes flutter#121527 ## 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. --------- Co-authored-by: Gray Mackall <34871572+gmackall@users.noreply.github.com>

A new way of supporting cross plugin communication is coming in Flutter 3.44 which allows for access to plugin published values through the `FlutterPluginBinding` on Android and the `FlutterPluginRegistry` on iOS. Update native WebView access to support these new methods and deprecate the old methods. refs: flutter/flutter#121527 flutter/flutter#182753 # Conflicts: # packages/webview_flutter/webview_flutter_wkwebview/pubspec.yaml

A new way of supporting cross plugin communication is coming in Flutter 3.44 which allows for access to plugin published values through the `FlutterPluginBinding` on Android and the `FlutterPluginRegistry` on iOS. Update native WebView access to support these new methods and deprecate the old methods. refs: flutter/flutter#121527 flutter/flutter#182753 ## Pre-Review Checklist

fuzzybinary requested a review from a team as a code owner February 23, 2026 13:02

github-actions Bot added platform-ios iOS applications specifically engine flutter/engine related. See also e: labels. team-ios Owned by iOS platform team labels Feb 23, 2026

gemini-code-assist Bot reviewed Feb 23, 2026

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Comment thread engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterEngine.mm Outdated

Add valuePublishedByPlugin to PluginRegistrar

d6447a6

Fixes flutter#121527

fuzzybinary force-pushed the 121527-cross-plugin-access branch from 4f1371a to d6447a6 Compare February 23, 2026 17:00

gaaclarke added the fyi-ecosystem For the attention of Ecosystem team label Feb 23, 2026

Add Android plugin access

9687062

fuzzybinary requested a review from a team as a code owner February 24, 2026 13:13

github-actions Bot added platform-android Android applications specifically team-android Owned by Android platform team labels Feb 24, 2026

fuzzybinary changed the title ~~Add valuePublishedByPlugin to PluginRegistrar~~ Add ability to access plugins from other plugins Feb 24, 2026

camsim99 self-requested a review February 24, 2026 21:46

hellohuanlin reviewed Feb 24, 2026

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Add iOS tests for valuePublishedByPlugin

9c3c34f

fuzzybinary requested a review from hellohuanlin February 25, 2026 15:48

reidbaker self-requested a review February 25, 2026 19:29

hellohuanlin previously approved these changes Feb 25, 2026

View reviewed changes

reidbaker previously approved these changes Feb 26, 2026

View reviewed changes

Add documentation to FlutterPlugin.getPlugin

914238c

Merge branch 'master' into 121527-cross-plugin-access

4b80c01

engine-flutter-autoroll mentioned this pull request Mar 22, 2026

Roll Flutter from dd64978dfae1 to 75bd5b7b5816 (53 revisions) flutter/packages#11329

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engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Mar 22, 2026

6b4d9f2f3 Add ability to access plugins from other plugins (flutter/f…

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…lutter#182753)

engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Mar 23, 2026

6b4d9f2f3 Add ability to access plugins from other plugins (flutter/f…

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This was referenced Mar 23, 2026

Roll Flutter from dd64978dfae1 to 17429363d473 (59 revisions) flutter/packages#11331

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Roll Flutter from dd64978dfae1 to 41670b7bd4eb (60 revisions) flutter/packages#11332

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engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Mar 23, 2026

6b4d9f2f3 Add ability to access plugins from other plugins (flutter/f…

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…lutter#182753)

engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Mar 23, 2026

6b4d9f2f3 Add ability to access plugins from other plugins (flutter/f…

7a75481

…lutter#182753)

engine-flutter-autoroll mentioned this pull request Mar 23, 2026

Roll Flutter from dd64978dfae1 to 94c7ecb272a4 (61 revisions) flutter/packages#11335

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engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Mar 23, 2026

6b4d9f2f3 Add ability to access plugins from other plugins (flutter/f…

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…lutter#182753)

engine-flutter-autoroll mentioned this pull request Mar 23, 2026

Roll Flutter from dd64978dfae1 to c7990b47e543 (63 revisions) flutter/packages#11336

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engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Mar 24, 2026

6b4d9f2f3 Add ability to access plugins from other plugins (flutter/f…

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…lutter#182753)

engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Mar 24, 2026

6b4d9f2f3 Add ability to access plugins from other plugins (flutter/f…

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…lutter#182753)

engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Mar 24, 2026

6b4d9f2f3 Add ability to access plugins from other plugins (flutter/f…

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…lutter#182753)

engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Mar 24, 2026

6b4d9f2f3 Add ability to access plugins from other plugins (flutter/f…

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…lutter#182753)

engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Mar 24, 2026

6b4d9f2f3 Add ability to access plugins from other plugins (flutter/f…

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…lutter#182753)

engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Mar 24, 2026

6b4d9f2f3 Add ability to access plugins from other plugins (flutter/f…

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…lutter#182753)

stuartmorgan-g mentioned this pull request Mar 25, 2026

Manual roll Flutter from dd64978dfae1 to 82d96ef98a33 (89 revisions) flutter/packages#11345

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engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Mar 25, 2026

6b4d9f2f3 Add ability to access plugins from other plugins (flutter/f…

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…lutter#182753)

engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Mar 25, 2026

6b4d9f2f3 Add ability to access plugins from other plugins (flutter/f…

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…lutter#182753)

engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Mar 25, 2026

6b4d9f2f3 Add ability to access plugins from other plugins (flutter/f…

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fuzzybinary mentioned this pull request Mar 26, 2026

WebView tracking is broken in iOS in Flutter 3.41 DataDog/dd-sdk-flutter#950

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fuzzybinary mentioned this pull request May 14, 2026

[webview] Add new method for cross plugin webview access flutter/packages#11714

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vashworth mentioned this pull request May 28, 2026

[macOS] Support FlutterPluginRegistrar.valuePublished(byPlugin:) #186911

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