Build C# for Android Native

android-arm64.pubxml

<?xml version="1.0" encoding="utf-8"?>
<!--
https://go.microsoft.com/fwlink/?LinkID=208121.
-->
<Project>
	<PropertyGroup>
		<Configuration>Release</Configuration>
		<Platform>Any CPU</Platform>
		<PublishDir>bin\Release\net8.0\publish\android-arm64\</PublishDir>
		<PublishProtocol>FileSystem</PublishProtocol>
		<_TargetId>Folder</_TargetId>
		<TargetFramework>net8.0</TargetFramework>
		<RuntimeIdentifier>linux-bionic-arm64</RuntimeIdentifier>
		<SelfContained>true</SelfContained>
		<PublishSingleFile>false</PublishSingleFile>
		<DisableUnsupportedError>true</DisableUnsupportedError>
		<PublishAotUsingRuntimePack>true</PublishAotUsingRuntimePack>
	</PropertyGroup>
</Project>

dotnet-android-aot.md

Compiling a C# project to an ELF executable that can run on Android

Guide based on https://github.com/josephmoresena/NativeAOT-AndroidHelloJniLib

• Download the Android NDK (I used version r26b)
• Under your project root directory, in ./Properties/PublishProfiles, create a file named android-arm64.pubxml with the contents as described in this gist.
• Run the following shell commands (written in PowerShell, may be ported to bash or similar)

dotnet build --configuration Release

$env:ANDROID_NDK_ROOT='C:\PUT\PATH\TO\NDK\HERE'
$env:PATH="$env:PATH;$env:ANDROID_NDK_ROOT\toolchains\llvm\prebuilt\windows-x86_64\bin"
$env:ObjCopyName="llvm-objcopy.exe"
$sysroot="$env:ANDROID_NDK_ROOT\toolchains\llvm\prebuilt\windows-x86_64\sysroot"

dotnet publish MyProject.csproj -p:PublishProfile=android-arm64 -p:CppCompilerAndLinker=clang -p:SysRoot="$sysroot"