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[marshal methods] Make AndroidEnvironmentInternal.UnhandledException public#10775

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[marshal methods] Make AndroidEnvironmentInternal.UnhandledException public#10775
Copilot wants to merge 5 commits intomainfrom
copilot/fix-unhandled-exception-crash

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Copilot AI commented Feb 5, 2026 •
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Summary

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

Changes

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:

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>

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

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@jonathanpeppers
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>
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Copilot AI commented Feb 5, 2026

@copilot

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

Copilot AI requested a review from jonathanpeppers February 5, 2026 22:37
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@jonathanpeppers jonathanpeppers Awaiting requested review from jonathanpeppers jonathanpeppers is a code owner

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

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