34.0 is not a valid TargetPlatformVersion for Android. Valid versions include: 35.0

Kim Strasser 1,076

I changed the Target framework in my Android project properties from .NET 8.0 to .NET 9.0.

But then I get this error:

34.0 is not a valid TargetPlatformVersion for Android. Valid versions include: 35.0

Screenshot 2024-11-19 102241

Is it necessary to change the Target OS version to 35.0?

In addition, is it necessary to change the targetSdkVersion in AndroidManifest.xml to 35?

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionName="2.6" android:versionCode="26">
	<uses-sdk android:minSdkVersion="31" android:targetSdkVersion="34" />

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 44,481 Reputation points Microsoft Vendor

2024-11-20T02:52:35.99+00:00

Is it necessary to change the Target OS version to 35.0?

According to the Minimum deployment targets, you do not need to reset Android's targetSdkVersion.

.NET MAUI 9 requires minimum deployment targets of iOS 12.2, and Mac Catalyst 15.0 (macOS 12.0). Android and Windows minimum deployment targets remain the same. For more information, see Supported platforms for .NET MAUI apps.

Did you specify the Android framework during your upgrade? For example, net9.0-android35.

Did you follow the Upgrade from .NET 8 to .NET 9 during your migration?

Your prompt reply will be highly appreciated.
Kim Strasser 1,076 Reputation points

2024-11-20T13:01:56.02+00:00
I have updated Target OS version to 35.0 and android:targetSdkVersion="35".

And I changed my csproj file from net9.0-android35 to:

<Project Sdk="Microsoft.NET.Sdk"> <PropertyGroup> <TargetFramework>net9.0-android</TargetFramework> <SupportedOSPlatformVersion>31.0</SupportedOSPlatformVersion> ... <ItemGroup> <PackageReference Include="Plugin.InAppBilling" Version="8.0.5" /> <PackageReference Include="Xamarin.AndroidX.Collection.Jvm" Version="1.4.5.1" /> <PackageReference Include="Xamarin.AndroidX.Collection.Ktx" Version="1.4.5.1" /> <PackageReference Include="Microsoft.Maui.Controls" /> <PackageReference Include="Microsoft.Maui.Core" Version="9.0.10" /> <PackageReference Include="Microsoft.Maui.Essentials" /> <PackageReference Include="MonoGame.Content.Builder.Task" Version="3.8.2.1105" /> <PackageReference Include="MonoGame.Framework.Android" Version="3.8.2.1105" /> <PackageReference Include="Newtonsoft.Json" Version="13.0.3" /> <PackageReference Include="Microsoft.AppCenter.Crashes" Version="5.0.6" /> <PackageReference Include="Microsoft.AppCenter.Analytics" Version="5.0.6" /> <PackageReference Include="Xamarin.Google.Guava" Version="33.3.1.1" /> <PackageReference Include="Xamarin.Firebase.Messaging" Version="124.0.3.1" /> <PackageReference Include="Xamarin.GooglePlayServices.Base" Version="118.5.0.3" /> <PackageReference Include="Xamarin.AndroidX.Preference" Version="1.2.1.11" /> <PackageReference Include="Xamarin.AndroidX.Core.SplashScreen" Version="1.0.1.13" /> <PackageReference Include="CommunityToolkit.Mvvm" Version="8.3.2" /> <PackageReference Include="Plugin.MediaManager" Version="1.2.2" /> <PackageReference Include="PlayFabAllSDK" Version="1.192.241108" /> </ItemGroup> ... <ItemGroup> <PackageReference Update="Microsoft.Maui.Controls" Version="9.0.10" /> </ItemGroup> <ItemGroup> <PackageReference Update="Microsoft.Maui.Controls.Compatibility" Version="9.0.10" /> </ItemGroup> <ItemGroup> <PackageReference Update="Microsoft.Maui.Essentials" Version="9.0.10" /> </ItemGroup>

I don´t know if it works now because I get another error after updating the NuGet packages: Argument 1: cannot convert from 'string' to 'string[]'

https://learn.microsoft.com/en-us/answers/questions/2121147/argument-1-cannot-convert-from-string-to-string()

EDIT:

It works now. I get no more errors. But I still get many warnings. Is it necessary to change something or can I ignore the warnings?

Detected package version outside of dependency constraint: Xamarin.AndroidX.Lifecycle.LiveData 2.8.5.1 requires Xamarin.AndroidX.Lifecycle.LiveData.Core.Ktx (>= 2.8.5.1 && < 2.8.6) but version Xamarin.AndroidX.Lifecycle.LiveData.Core.Ktx 2.8.7.1 was resolved. Detected package version outside of dependency constraint: Xamarin.AndroidX.Lifecycle.LiveData 2.8.5.1 requires Xamarin.AndroidX.Lifecycle.LiveData.Core (>= 2.8.5.1 && < 2.8.6) but version Xamarin.AndroidX.Lifecycle.LiveData.Core 2.8.7.1 was resolved. Detected package version outside of dependency constraint: Xamarin.AndroidX.Lifecycle.LiveData.Ktx 2.8.3.1 requires Xamarin.AndroidX.Lifecycle.LiveData.Core.Ktx (>= 2.8.3.1 && < 2.8.4) but version Xamarin.AndroidX.Lifecycle.LiveData.Core.Ktx 2.8.7.1 was resolved. Detected package version outside of dependency constraint: Xamarin.AndroidX.Lifecycle.LiveData.Ktx 2.8.3.1 requires Xamarin.AndroidX.Lifecycle.LiveData (>= 2.8.3.1 && < 2.8.4) but version Xamarin.AndroidX.Lifecycle.LiveData 2.8.5.1 was resolved. NU1608: Detected package version outside of dependency constraint: Xamarin.AndroidX.Lifecycle.LiveData 2.8.5.1 requires Xamarin.AndroidX.Lifecycle.LiveData.Core.Ktx (>= 2.8.5.1 && < 2.8.6) but version Xamarin.AndroidX.Lifecycle.LiveData.Core.Ktx 2.8.7.1 was resolved. NU1608: Detected package version outside of dependency constraint: Xamarin.AndroidX.Lifecycle.LiveData.Ktx 2.8.3.1 requires Xamarin.AndroidX.Lifecycle.LiveData.Core.Ktx (>= 2.8.3.1 && < 2.8.4) but version Xamarin.AndroidX.Lifecycle.LiveData.Core.Ktx 2.8.7.1 was resolved. NU1608: Detected package version outside of dependency constraint: Xamarin.AndroidX.Lifecycle.LiveData 2.8.5.1 requires Xamarin.AndroidX.Lifecycle.LiveData.Core (>= 2.8.5.1 && < 2.8.6) but version Xamarin.AndroidX.Lifecycle.LiveData.Core 2.8.7.1 was resolved. NU1608: Detected package version outside of dependency constraint: Xamarin.AndroidX.Lifecycle.LiveData.Ktx 2.8.3.1 requires Xamarin.AndroidX.Lifecycle.LiveData (>= 2.8.3.1 && < 2.8.4) but version Xamarin.AndroidX.Lifecycle.LiveData 2.8.5.1 was resolved. XA0141: NuGet package '<unknown>' version '<unknown>' contains a shared library 'libopenal32.so' which is not correctly aligned. See https://developer.android.com/guide/practices/page-sizes for more details

Accepted answer

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 44,481 Reputation points Microsoft Vendor

2024-11-21T02:36:33.8166667+00:00

Hello,

Thanks for your feedback.

As the documentation mentions, there is no need to specify an additional Android SDK version number when upgrading to .NET 9.

It works now. I get no more errors. But I still get many warnings. Is it necessary to change something or can I ignore the warnings?

This is because these Nuget Packages have not yet completed the migration to .net 9.0. You can wait for them to officially support .net 9.0 and then update them to resolve these warnings.

Best Regards,

Alec Liu.

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34.0 is not a valid TargetPlatformVersion for Android. Valid versions include: 35.0

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