MAUI app on Android can't load a native Android lib (.so)

[if-mindesk]

Description

I built a sample MAUI app that needs to load Rhino CAD files using the nuget package Rhino3dm (https://www.nuget.org/packages/Rhino3dm/).
This package uses a native .so lib that the MAUI app on Android can't find (DllNotFoundException for 'librhino3dm_native').
I don't know if this issue is caused by MAUI, by the nuget package or something else
I also opened an issue for Rhino3dm mcneel/rhino3dm#633

Steps to Reproduce

Copy the file SampleFileRhino3dm/CubeTest200mm.3dm on the Android device
Start the app
Press the 'Pick Rhino 3dm file' button and select the provided file

Link to public reproduction project repository

https://github.com/if-mindesk/TestRhino3dm.git

Version with bug

8.0.70 SR7

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

Android

Did you find any workaround?

No

Relevant log output

No response

[github-actions]

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[Zhanglirong-Winnie]

This issue has been verified using Visual Studio 17.11.0 Preview 5.0(8.0.70). Can repro on Android device platform.

[blackmesacode]

whatever causes this issue, might also be the reason for this issue: libgit2/libgit2sharp.nativebinaries#158

basically also a System.DllNotFoundException potentially due to android maui not loading the native *.so library

[grendello]

@if-mindesk I downloaded the latest nuget for Rhino and it doesn't contain Android shared libraries. There are libraries for desktop Linux (amd64 and arm64), but they won't work on Android. You will need a build that targets Android. Also, be aware that the library uses libc++ and on Android that means you have to package the libc++ library from the Android NDK, since Android doesn't ship a full C++ library on devices.

I am going to close this issue since there's nothing we can do on our end. However, should you continue to have any issues once the right nuget package is available, please reopen this issue.