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webview_flutter_android fails compilation on Kotlin 1.8 #178756
Description
What package does this bug report belong to?
webview_flutter
What target platforms are you seeing this bug on?
Android
Have you already upgraded your packages?
Yes
Dependency versions
pubspec.lock
[Paste file content here]
Steps to reproduce
- Run
flutter pub geton a project usingwebview_flutterand using Kotlin 1.8.x. - Attempt to build for android
Expected results
App builds
Actual results
Compiler error from Android:
e: file:///Users/jeff.ward/.pub-cache/hosted/pub.dev/webview_flutter_android-4.10.6/android/src/main/java/io/flutter/plugins/webviewflutter/AndroidWebkitLibrary.g.kt:222:71 Type argument is not within its bounds: should be subtype of 'Any'
Code sample
Code sample
None
Screenshots or Videos
No response
Logs
No response
Flutter Doctor output
Doctor output
[✓] Flutter (Channel stable, 3.38.1, on macOS 15.7.1 24G231 darwin-arm64, locale en-US)
[!] Android toolchain - develop for Android devices (Android SDK version 36.0.0)
! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses
[✓] Xcode - develop for iOS and macOS (Xcode 16.4)
[✓] Chrome - develop for the web
[✓] Connected device (4 available)
! Error: Browsing on the local area network for Jeff’s iPhone. Ensure the device is unlocked and attached with a cable or associated with the same local area network as this Mac.
The device must be opted into Developer Mode to connect wirelessly. (code -27)
[✓] Network resources
Activity
fuzzybinary commentedon Nov 18, 2025
Sorry for a lack of much more information. We updated to 2.1.0 across all examples later that day. I only noticed this because it failed our CI on an older version of our library.
cc: @stuartmorgan-g
stuartmorgan-g commentedon Nov 18, 2025
From Discord, this worked in
webview_flutter_android4.10.5 and failed in 4.10.6. That was just a Pigeon update from 25.3.2 to 26.1.0. The erroring code is from flutter/packages#10039; glancing at the code and the error it looks like this is probably related to having a generic<T>calling a<T : Any>, but I'm not familiar with the details of Kotlin templating./cc @bparrishMines
harshadok commentedon Nov 19, 2025
Same issue here
[pigeon] Fixes compilation error with unbounded type parameter for In…
[webview_flutter] Update Pigeon for Kotlin 1.8 compat (flutter#10486)
github-actions commentedon Dec 5, 2025
This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of
flutter doctor -vand a minimal reproduction of the issue.[pigeon] Fixes compilation error with unbounded type parameter for In…
[webview_flutter] Update Pigeon for Kotlin 1.8 compat (flutter#10486)