[marshal methods] Make AndroidEnvironmentInternal.UnhandledException public by Copilot · Pull Request #10775 · dotnet/android

Copilot · 2026-02-05T19:43:33Z

Summary

Fixes issue #10602 where marshal method wrappers would crash with MethodAccessException when calling Android.Runtime.AndroidEnvironmentInternal.UnhandledException().

Changes

Made AndroidEnvironmentInternal class public with [EditorBrowsable(EditorBrowsableState.Never)] attribute
Made UnhandledException method public with [EditorBrowsable(EditorBrowsableState.Never)] attribute
Added test MarshalMethodsUnhandledExceptionRuntimeFixUpWorks (matching @grendello's version from PR [marshal methods] Make AndroidEnvironmentInternal.UnhandledException … #10607, with additional method assertions)

Note: Removed [DebuggerBrowsable] attributes as they are only valid on properties, indexers, and fields - not on types or methods.

Original prompt

This section details on the original issue you should resolve

<issue_title>Crashes with Method Android.Runtime.AndroidEnvironmentInternal.UnhandledException(System.Exception) is inaccessible (...) exception</issue_title>
<issue_description>### Android framework version

net9.0-android

Affected platform version

MAUI 9.0.110

Description

For some time I've been noticing random crashes for some % of users with this stacktrace

System.MethodAccessException: Method `Android.Runtime.AndroidEnvironmentInternal.UnhandledException(System.Exception)' is inaccessible from method `AndroidX.Fragment.App.Fragment.n_OnCreateView_Landroid_view_LayoutInflater_Landroid_view_ViewGroup_Landroid_os_Bundle__mm_wrapper(intptr,intptr,intptr,intptr,intptr)'
   at AndroidX.Fragment.App.Fragment.n_OnCreateView_Landroid_view_LayoutInflater_Landroid_view_ViewGroup_Landroid_os_Bundle__mm_wrapper(IntPtr jnienv, IntPtr native__this, IntPtr native_inflater, IntPtr native_container, IntPtr native_savedInstanceState)

Since it's happening in release mode and I can't reproduce it it's hard to say anything more about it.

Don't know how useful that would be but the first time I got a log with this error was on 06/17/2025 but I can't tell if it's due to some changes in MAUI/net-android or in my configuration

Steps to Reproduce

Did you find any workaround?

No response

Relevant log output

```</issue_description>

<agent_instructions>Can you fix this issue, where we just made the problematic class/method public?

To help prevent developers from using it, can you mark any newly public APIs:
```csharp
[DebuggerBrowsable (DebuggerBrowsableState.Never)]
[EditorBrowsable (EditorBrowsableState.Never)]

Add the test case from here:

[marshal methods] Make AndroidEnvironmentInternal.UnhandledException … #10607

Add to your commit message:

Co-authored-by: Marek Habersack <grendel@twistedcode.net>
```</agent_instructions>

## Comments on the Issue (you are @copilot in this section)

<comments>
<comment_new><author>@grendello</author><body>
@OvrBtn the OP trace definitely suggests a connection to marshal methods (the `_mm_wrapper` prefix indicates a marshal methods wrapper in use), so that's at least one scenario.
As for your new release, can you attach here the `lib/arm64-v8a/libassemblies.arm64-v8a.blob.so` file from your apk, please?
It would also be useful to see the stack trace from the new version crash. Thanks!</body></comment_new>
<comment_new><author>@grendello</author><body>
@OvrBtn cool, thanks for the .so and the trace! I wanted to confirm that `Mono.Android.Runtime.dll` is packaged in your app, and it is. However, looking at the latest trace, you are still using marshal methods - otherwise we wouldn't see the `__mm_wrapper` suffix. Seems like something overrode your `<AndroidEnableMarshalMethods>false</AndroidEnableMarshalMethods>` setting? Build your app from a clean state (after removing `bin` and `obj`) and record a binlog (`-bl` command line parameter to `dotnet build`) and see what is the actual value of `AndroidEnableMarshalMethods` property.</body></comment_new>
<comment_new><author>@grendello</author><body>
@OvrBtn examine dll files in `obj/` in the latest build to see if they contain any methods with the `_mm_wrapper` suffix - there should be none.</body></comment_new>
<comment_new><author>@grendello</author><body>
@OvrBtn ok, then at least your local build behaves correctly. The next step would be to examine the CI binlogs and dll contents.</body></comment_new>
<comment_new><author>@grendello</author><body>
@OvrBtn Glad you found the issue in your latest release! The issue in OP is a real one and once the deities of CI decide that it's a good time and date for a green build, a fix will be in `main` soon.</body></comment_new>
</comments>

Fixes Crashes with Method Android.Runtime.AndroidEnvironmentInternal.UnhandledException(System.Exception) is inaccessible (...) exception #10602

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

…odAccessException Co-authored-by: Marek Habersack <grendel@twistedcode.net> Co-authored-by: jonathanpeppers <840039+jonathanpeppers@users.noreply.github.com>

Co-authored-by: Marek Habersack <grendel@twistedcode.net> Co-authored-by: jonathanpeppers <840039+jonathanpeppers@users.noreply.github.com>

src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/BuildTest2.cs

Co-authored-by: Marek Habersack <grendel@twistedcode.net> Co-authored-by: jonathanpeppers <840039+jonathanpeppers@users.noreply.github.com>

Copilot · 2026-02-05T22:36:18Z

@copilot

Removed the [DebuggerBrowsable] attributes in commit e9a4e22, keeping only [EditorBrowsable(EditorBrowsableState.Never)] on both the class and method.

Copilot

Pull request overview

This PR fixes MethodAccessException crashes from marshal method wrappers by making Android.Runtime.AndroidEnvironmentInternal.UnhandledException(Exception) accessible outside Mono.Android.dll, while attempting to keep the API “hidden” from normal IntelliSense usage.

Changes:

Made AndroidEnvironmentInternal and its UnhandledException method public, both annotated with [EditorBrowsable (EditorBrowsableState.Never)].
Added a build test that inspects the linked Mono.Android.Runtime.dll to ensure the type/method are public.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
src/Mono.Android.Runtime/Android.Runtime/AndroidEnvironmentInternal.cs	Exposes the previously-internal runtime hook used by marshal method wrappers.
src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/BuildTest2.cs	Adds a regression test validating the linked runtime assembly contains the now-public API.

src/Mono.Android.Runtime/Android.Runtime/AndroidEnvironmentInternal.cs

src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/BuildTest2.cs

Initial plan

6c4579a

Copilot AI assigned Copilot and jonathanpeppers Feb 5, 2026

Copilot started work on behalf of jonathanpeppers February 5, 2026 19:44 View session

Copilot AI and others added 2 commits February 5, 2026 20:16

Make AndroidEnvironmentInternal.UnhandledException public to fix Meth…

4f3b8c1

…odAccessException Co-authored-by: Marek Habersack <grendel@twistedcode.net> Co-authored-by: jonathanpeppers <840039+jonathanpeppers@users.noreply.github.com>

Update test to also verify UnhandledException method is public

23936e1

Co-authored-by: Marek Habersack <grendel@twistedcode.net> Co-authored-by: jonathanpeppers <840039+jonathanpeppers@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Fix crashes due to inaccessible Android method~~ [marshal methods] Make AndroidEnvironmentInternal.UnhandledException public Feb 5, 2026

Copilot AI requested a review from jonathanpeppers February 5, 2026 20:21

Copilot finished work on behalf of jonathanpeppers February 5, 2026 20:21

jonathanpeppers reviewed Feb 5, 2026

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src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/BuildTest2.cs Outdated Show resolved Hide resolved

Copilot started work on behalf of jonathanpeppers February 5, 2026 21:31 View session

Match test to grendello's version from PR #10607

afaba98

Co-authored-by: Marek Habersack <grendel@twistedcode.net> Co-authored-by: jonathanpeppers <840039+jonathanpeppers@users.noreply.github.com>

Copilot AI requested a review from jonathanpeppers February 5, 2026 21:52

Copilot finished work on behalf of jonathanpeppers February 5, 2026 21:52

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Copilot started work on behalf of jonathanpeppers February 5, 2026 22:17 View session

Remove DebuggerBrowsable attributes - only valid on properties/fields

e9a4e22

Co-authored-by: Marek Habersack <grendel@twistedcode.net> Co-authored-by: jonathanpeppers <840039+jonathanpeppers@users.noreply.github.com>

Copilot AI requested a review from jonathanpeppers February 5, 2026 22:37

Copilot finished work on behalf of jonathanpeppers February 5, 2026 22:37

jonathanpeppers marked this pull request as ready for review February 6, 2026 15:54

jonathanpeppers requested review from grendello and simonrozsival as code owners February 6, 2026 15:54

Copilot AI review requested due to automatic review settings February 6, 2026 15:54

Copilot started reviewing on behalf of jonathanpeppers February 6, 2026 15:55 View session

Copilot AI reviewed Feb 6, 2026

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simonrozsival approved these changes Feb 6, 2026

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jonathanpeppers approved these changes Feb 6, 2026

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jonathanpeppers merged commit e47afe1 into main Feb 6, 2026
8 of 12 checks passed

jonathanpeppers deleted the copilot/fix-unhandled-exception-crash branch February 6, 2026 16:06

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[marshal methods] Make AndroidEnvironmentInternal.UnhandledException public#10775

[marshal methods] Make AndroidEnvironmentInternal.UnhandledException public#10775
jonathanpeppers merged 5 commits intomainfrom
copilot/fix-unhandled-exception-crash

Copilot AI commented Feb 5, 2026 •

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Summary

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Copilot AI commented Feb 5, 2026 •

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