Create Xamarin.Forms Android App Bundle (aab) and release it to Google Play Store with DevOps YAML

xamarin-forms-android-aab-yaml-pipeline.yaml

trigger:
  branches:
    include:
      # Your CI branch that the build should be triggered for
      - vNext

stages: 
  - stage: Build
    pool:
      vmImage: 'windows-latest'
    jobs:  
      - job: GenerateAab

        variables:
          # Your major and minor version numbers
          appVersion: '1.2'
          buildConfiguration: 'Release'          
          androidNdkPath: 'C:\Microsoft\AndroidNDK64\android-ndk-r16b'

        steps:        
        # Code "stolen" from James, from his DevOps tasks -> https://github.com/jamesmontemagno/vsts-mobile-tasks
        - task: PowerShell@2
          displayName: 'Updating Version Code and Name in Android Manifest'
          inputs:
            targetType: 'inline'
            script: |
              [string] $sourcePath = "$(System.DefaultWorkingDirectory)\Path\To\Your\Android\Project\Properties\AndroidManifest.xml"
              [string] $appVersionName = "$(AppVersion).$(Build.BuildId)"
              # I would suggest to use Build.BuildId variable for the version code but I've started using date and can't go back to lower numbers
              [string] $appVersionCode = Get-Date -Format "yyMMddHH"
              
              # Load the Android Manifest file
              [xml] $androidManifestXml = Get-Content -Path $sourcePath
              
              Write-Host "Original Manifest:"
              Get-Content $sourcePath | Write-Host
              
              # Get the version name
              $VersionName= Select-Xml -xml $androidManifestXml  -Xpath "/manifest/@android:versionName" -namespace @{android = "http://schemas.android.com/apk/res/android" }
              
              $oldVersionName= $VersionName.Node.Value;
              
              Write-Host " (i) Original Version Name: $oldVersionName"  
              
              $VersionName.Node.Value = $appVersionName 
              
              Write-Host " (i) New Package Name: $appVersionName"
              
              # Get the version code
              $VersionCode= Select-Xml -xml $androidManifestXml  -Xpath "/manifest/@android:versionCode" -namespace @{android = "http://schemas.android.com/apk/res/android" }
                  
              $oldVersionCode = $VersionCode.Node.Value;
              
              Write-Host " (i) Old Version Code: $oldVersionCode"
              
              $VersionCode.Node.Value = $appVersionCode 
                  
              Write-Host " (i) New App Name: $appVersionCode " 
              
              $androidManifestXml.Save($sourcePath)
              
              Write-Host "Final Manifest:"
              Get-Content $sourcePath | Write-Host

        - task: NuGetToolInstaller@1
          displayName: 'Installing Nuget'

        - task: NuGetCommand@2
          displayName: 'Restoring Nugets'
          inputs:
            restoreSolution: '**/*.sln'

        - task: DownloadSecureFile@1
          displayName: 'Download keystore'
          # This file's name will be used in the build task as a value for parameter AndroidSigningKeyStore 
          name: keystore
          inputs:
            # This file needs to be stored in the DevOps' Library
            secureFile: 'NameOfYourKeystoreFile.keystore'

        # KeystorePassword is a secure variable that has been set using GUI in the DevOps portal
        - task: XamarinAndroid@1
          displayName: 'Build aab'
          inputs:
            projectFile: Path/To/Your/Android/Project/NameOfYourDroidHeadProject.csproj
            outputDirectory: '$(Build.BinariesDirectory)'
            configuration: '$(BuildConfiguration)'
            clean: true
            msbuildVersionOption: latest
            msbuildArguments: ' /p:JavaSdkDirectory="$(JAVA_HOME)/" /t:SignAndroidPackage /p:AndroidNdkDirectory="$(androidNdkPath)" /p:AndroidKeyStore="True" /p:AndroidSigningKeyStore="$(keystore.secureFilePath)" /p:AndroidSigningKeyPass="$(KeystorePassword)" /p:AndroidSigningKeyAlias="YourKeystoreAlias" /p:AndroidSigningStorePass="$(KeystorePassword)"'

        - task: PublishPipelineArtifact@1
          displayName: 'Publishing aab artifacts'
          inputs:          
            targetPath: '$(Build.BinariesDirectory)'
            artifact: AndroidAabPackage
            publishLocation: 'pipeline'

  - stage: Release
    pool:
      vmImage: 'macOS-latest'
    dependsOn: Build
    # The condition checks if the Build stage has succeeded and if it has been triggered from the vNext branch
    condition: and(succeeded(), eq(variables['Build.SourceBranch'], 'refs/heads/vNext'))
    jobs:
    - job: GooglePlayBetaRelease
      steps:

      # Another file that needs to be stored in the DevOps' Library (see my previous post on how to generate it)
      - task: DownloadSecureFile@1
        displayName: 'Download Google Play Console JSON key auth file'
        name: serviceAccAuthJson
        inputs:
          secureFile: 'Google_Play_Store_Dev_Ops_Service_Acc_Auth.json'

      - task: DownloadPipelineArtifact@2
        displayName: 'Downloading aab package'
        inputs:
          buildType: 'current'
          artifactName: 'AndroidAabPackage'
          itemPattern: '**/com.yourcompanyname.yourappname-Signed.aab'
          targetPath: '$(Build.SourcesDirectory)\Artifacts'

      - task: Bash@3
        displayName: 'Fastlane - Release aab to Beta'        
        inputs:
          workingDirectory: '$(Build.SourcesDirectory)\Artifacts'
          targetType: 'inline'
          script: |
          
            fastlane supply --aab com.yourcompanyname.yourappname-Signed.aab --json_key $(serviceAccAuthJson.secureFilePath) --track beta --rollout 1.0 --package_name com.yourcompanyname.yourappname --skip_upload_apk true