Add Android device tests with bundled ICU 72

.config/dotnet-tools.json

@@ -0,0 +1,12 @@
+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "microsoft.dotnet.xharness.cli": {
+      "version": "11.0.0-prerelease.26217.1",
+      "commands": [
+        "xharness"
+      ]
+    }
+  }
+}

.gitattributes

@@ -24,5 +24,6 @@
 *.xml -whitespace
 *.yml -whitespace
 *.json -whitespace
+*.sh text eol=lf
 changelog -whitespace
 GitVersion.yml -whitespace

.github/workflows/CI-CD.yml

@@ -88,6 +88,85 @@ jobs:
           output/*.snupkg
       if: matrix.os == 'ubuntu-latest'
 
+  android-build-and-test:
+    name: "Android Build and Test"
+    runs-on: ubuntu-latest
+    timeout-minutes: 120
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      with:
+        fetch-depth: '0'
+
+    - name: Install .NET
+      uses: actions/setup-dotnet@9a946fdbd5fb07b82b2f5a4466058b876ab72bb2 # v5.3.0
+      with:
+        dotnet-version: |
+          8.0.x
+          10.0.x
+
+    - name: Install Java
+      uses: actions/setup-java@5896cecc08fd8a1fbdfaf517e29b571164b031f7 # v4.2.0
+      with:
+        distribution: temurin
+        java-version: 17
+
+    - name: Install MAUI Android workload
+      run: dotnet workload install maui-android
+
+    - name: Install Android NDK
+      run: |
+        SDK_ROOT="${ANDROID_HOME:-/usr/local/lib/android/sdk}"
+        echo "ANDROID_HOME=$SDK_ROOT" >> "$GITHUB_ENV"
+        echo "ANDROID_SDK_ROOT=$SDK_ROOT" >> "$GITHUB_ENV"
+        yes | "$SDK_ROOT/cmdline-tools/latest/bin/sdkmanager" --licenses || true
+        "$SDK_ROOT/cmdline-tools/latest/bin/sdkmanager" --install "ndk;27.0.12077973"
+        echo "ANDROID_NDK_HOME=$SDK_ROOT/ndk/$(ls "$SDK_ROOT/ndk" | sort -V | tail -1)" >> "$GITHUB_ENV"
+
+    - name: Cache ICU Android build
+      uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
+      with:
+        path: output/android-icu
+        key: android-icu-${{ runner.os }}-72.1-x86_64-${{ hashFiles('scripts/build-icu-android.sh') }}
+        restore-keys: |
+          android-icu-${{ runner.os }}-72.1-x86_64-
+
+    - name: Build ICU for Android
+      run: bash scripts/build-icu-android.sh --arch=x86_64
+
+    - name: Build Android test project
+      run: |
+        export IcuDotNetIncludeAndroid=true
+        dotnet build --configuration Release source/icu.net.android.tests/icu.net.android.tests.csproj \
+          -f net10.0-android -p:IcuDotNetIncludeAndroid=true
+
+    - name: Enable KVM
+      run: |
+        echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | sudo tee /etc/udev/rules.d/99-kvm4all.rules
+        sudo udevadm control --reload-rules
+        sudo udevadm trigger --name-match=kvm
+
+    - name: Run Android device tests
+      uses: reactivecircus/android-emulator-runner@e89f39f1abbbd05b1113a29cf4db69e7540cae5a # v2.35.0
+      with:
+        api-level: 30
+        arch: x86_64
+        target: google_apis
+        profile: pixel_6
+        disable-animations: true
+        script: bash scripts/ci-android-tests.sh
+
+    - name: Upload Test Results
+      if: always()
+      uses: actions/upload-artifact@5d5d22a31266ced268874388b861e4b58bb5c2f3 # v4.3.1
+      with:
+        name: Test Results (android)
+        path: |
+          source/icu.net.android.tests/test-results/**
+          **/TestResults/*.xml
+        if-no-files-found: warn
+
   publish-nuget:
     name: "Publish NuGet package"
     runs-on: ubuntu-22.04

.github/workflows/test-results.yml

@@ -40,4 +40,6 @@ jobs:
           commit: ${{ github.event.workflow_run.head_sha }}
           event_file: artifacts/Event File/event.json
           event_name: ${{ github.event.workflow_run.event }}
-          nunit_files: "artifacts/**/*.xml"
+          files: |
+            artifacts/**/*.xml
+            artifacts/**/*.trx

.gitignore

@@ -5,6 +5,8 @@ build/nuget.exe
 build/packages/
 lib/
 output/
+# Explicit marker for Android ICU cross-compile output (also under output/)
+output/android-icu/
 bin/
 obj/
 test-results/

scripts/build-icu-android.ps1

@@ -0,0 +1,58 @@
+#Requires -Version 5.1
+<#
+.SYNOPSIS
+    Cross-compile ICU4C for Android (one-time setup, like brew install icu4c on macOS).
+
+.DESCRIPTION
+    Invokes scripts/build-icu-android.sh via Git Bash or WSL bash.
+    Output (gitignored): output/android-icu/{x86_64,arm64-v8a}/libicu*.so*
+
+    Prerequisites:
+    - Android NDK (ANDROID_NDK_HOME or ANDROID_HOME/ndk/<version>)
+    - Git Bash or WSL with: bash, curl, tar, make
+
+.EXAMPLE
+    .\scripts\build-icu-android.ps1
+    .\scripts\build-icu-android.ps1 -Arch x86_64
+    .\scripts\build-icu-android.ps1 -Arch x86_64,arm64-v8a
+#>
+[CmdletBinding()]
+param(
+    [string] $Arch = 'x86_64',
+    [string] $IcuVersion = '72.1',
+    [int] $ApiLevel = 21,
+    [switch] $Clean
+)
+
+$ErrorActionPreference = 'Stop'
+$repoRoot = Split-Path -Parent $PSScriptRoot
+$bashScript = Join-Path $PSScriptRoot 'build-icu-android.sh'
+
+function Find-Bash {
+    $candidates = @(
+        (Get-Command bash -ErrorAction SilentlyContinue)?.Source,
+        'C:\Program Files\Git\bin\bash.exe',
+        'C:\Program Files (x86)\Git\bin\bash.exe'
+    ) | Where-Object { $_ -and (Test-Path $_) }
+    return $candidates | Select-Object -First 1
+}
+
+$bash = Find-Bash
+if (-not $bash) {
+    Write-Error @"
+bash not found. Install Git for Windows or use WSL, then re-run this script.
+Alternatively run: bash scripts/build-icu-android.sh --arch=$Arch
+"@
+}
+
+$args = @(
+    $bashScript
+    "--arch=$Arch"
+    "--api=$ApiLevel"
+    "--icu-version=$IcuVersion"
+)
+if ($Clean) { $args += '--clean' }
+
+Write-Host "Running: $bash $($args -join ' ')"
+& $bash @args
+exit $LASTEXITCODE