I am trying to integrate Firebase Analytics and Crashlytics into a .NET MAUI (.NET 10) Android application, but I am facing a runtime exception related to Crashlytics.

Question

I am trying to integrate Firebase Analytics and Crashlytics into a .NET MAUI (.NET 10) Android application, but I am facing a runtime exception related to Crashlytics.

Vignesh Palthurai 0

Steps I followed:

Created a new .NET MAUI project

Created a Firebase project and added an Android app

Ensured the ApplicationId matches the package name

Added google-services.json to: Platforms/Android/google-services.json

Set Build Action to GoogleServicesJson

Installed the following NuGet packages:

Plugin.Firebase
Plugin.Firebase.Analytics

Plugin.Firebase.Crashlytics
Configuration:

ApplicationId in .csproj: com.companyname.firebasepocapp

Package name in AndroidManifest.xml: com.companyname.firebasepocapp

Error:

At runtime, I get the following exception:
Java.Lang.RuntimeException: Unable to get provider com.google.firebase.provider.FirebaseInitProvider: java.lang.IllegalStateException: The Crashlytics build ID is missing.
What I have tried:

Verified google-services.json placement and build action

Ensured package names match

Cleaned and rebuilt the solution

Questions:

Is additional Android Gradle configuration required for Crashlytics in .NET MAUI (.NET 10)?

Does Plugin.Firebase fully support Crashlytics for .NET 10?

Is there any required initialization code or setup missing for Analytics and Crashlytics?

Any guidance or working setup example would be helpful.

Environment:

.NET MAUI (.NET 10)

Android target

Visual Studio 2026

Plugin.Firebase (latest available version)

0 comments

2 answers

Your answer

Answer 1

Hi @Vignesh Palthurai ,

I’ve tested this on my device and it works as expected. I have a few notes before sharing the code examples.

I’m using the same version (4.0.0) for all three packages in the .csproj. I recommend doing the same.

<PackageReference Include="Plugin.Firebase" Version="4.0.0" />
<PackageReference Include="Plugin.Firebase.Analytics" Version="4.0.0" />
<PackageReference Include="Plugin.Firebase.Crashlytics" Version="4.0.0" />

Because I encountered an SDK-related error, I changed the minimum Android API level from 21 to 23:

<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">23.0</SupportedOSPlatformVersion>

You still need to keep strings.xml (Platforms/Android/Resources/values/strings.xml), as mentioned earlier:

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <string name="com.google.firebase.crashlytics.mapping_file_id">none</string>
  <string name="com.crashlytics.android.build_id">1.0</string>
</resources

We must also include the following configuration in the .csproj file:

<ItemGroup Condition="'$(TargetFramework)' == 'net10.0-android'">
  <GoogleServicesJson Include="Platforms\Android\google-services.json" />
</ItemGroup>

You can refer to following code examples:

This is MauiProgram.cs:

using Microsoft.Extensions.Logging;
using Microsoft.Maui.LifecycleEvents;

#if IOS || ANDROID
using Plugin.Firebase.Analytics;
using Plugin.Firebase.Crashlytics;
#endif

#if IOS
using Plugin.Firebase.Core.Platforms.iOS;
#elif ANDROID
using Plugin.Firebase.Core.Platforms.Android;
#endif

namespace MauiApp2;

public static class MauiProgram
{
    public static MauiApp CreateMauiApp()
    {
        var builder = MauiApp.CreateBuilder();

        builder
            .UseMauiApp<App>()
            .RegisterFirebaseServices()
            .ConfigureFonts(fonts =>
            {
                fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
                fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
            });

#if DEBUG
        builder.Logging.AddDebug();
#endif

        return builder.Build();
    }

    private static MauiAppBuilder RegisterFirebaseServices(this MauiAppBuilder builder)
    {
#if IOS || ANDROID
        builder.ConfigureLifecycleEvents(events =>
        {
#if IOS
            events.AddiOS(iOS => iOS.WillFinishLaunching((_, _) =>
            {
                CrossFirebase.Initialize();
                return false;
            }));
#elif ANDROID
            events.AddAndroid(android => android.OnCreate((activity, _) =>
            {
                CrossFirebase.Initialize(activity, () => Microsoft.Maui.ApplicationModel.Platform.CurrentActivity);
                FirebaseAnalyticsImplementation.Initialize(activity);
            }));
#endif
        });

        builder.Services.AddSingleton(_ => CrossFirebaseAnalytics.Current);
        builder.Services.AddSingleton(_ => CrossFirebaseCrashlytics.Current);
#endif

        return builder;
    }
}

MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="MauiApp2.MainPage">
    <VerticalStackLayout Padding="30" Spacing="20" VerticalOptions="Center">
        <Label Text="Firebase Test App" FontSize="Large" HorizontalOptions="Center" />

        <Button Text="Log Analytics Event" Clicked="OnLogEventClicked" />

        <Button Text="Force Test Crash (Crashlytics)"
                Clicked="OnCrashClicked"
                BackgroundColor="Red" TextColor="White" />
    </VerticalStackLayout>
</ContentPage>

This is MainPage.xaml.cs:

using Plugin.Firebase.Analytics;
using Plugin.Firebase.Crashlytics;

namespace MauiApp2
{
    public partial class MainPage : ContentPage
    {
        int count = 0;

        public MainPage()
        {
            InitializeComponent();
        }

        private void OnLogEventClicked(object sender, EventArgs e)
        {
            CrossFirebaseAnalytics.Current.LogEvent("test_button_clicked",
                new Dictionary<string, object> { { "button", "analytics_test" } });

            DisplayAlert("Analytics", "Event sent to Firebase!", "OK");
        }

        private void OnCrashClicked(object sender, EventArgs e)
        {
            CrossFirebaseCrashlytics.Current.RecordException(new Exception("Test non-fatal exception"));
            throw new Exception("This is a deliberate test crash for Crashlytics");
        }
    }
}

My .csprj file:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFrameworks>net10.0-android</TargetFrameworks>
    <TargetFrameworks Condition="!$([MSBuild]::IsOSPlatform('linux'))">$(TargetFrameworks);net10.0-ios;net10.0-maccatalyst</TargetFrameworks>
    <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net10.0-windows10.0.19041.0</TargetFrameworks>

    <!-- Note for MacCatalyst:
    The default runtime is maccatalyst-x64, except in Release config, in which case the default is maccatalyst-x64;maccatalyst-arm64.
    When specifying both architectures, use the plural <RuntimeIdentifiers> instead of the singular <RuntimeIdentifier>.
    The Mac App Store will NOT accept apps with ONLY maccatalyst-arm64 indicated;
    either BOTH runtimes must be indicated or ONLY macatalyst-x64. -->
    <!-- For example: <RuntimeIdentifiers>maccatalyst-x64;maccatalyst-arm64</RuntimeIdentifiers> -->

    <OutputType>Exe</OutputType>
    <RootNamespace>MauiApp2</RootNamespace>
    <UseMaui>true</UseMaui>
    <SingleProject>true</SingleProject>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>

    <!-- Enable XAML source generation for faster build times and improved performance.
         This generates C# code from XAML at compile time instead of runtime inflation.
         To disable, remove this line.
         For individual files, you can override by setting Inflator metadata:
           <MauiXaml Update="MyPage.xaml" Inflator="Default" /> (reverts to defaults: Runtime for Debug, XamlC for Release)
           <MauiXaml Update="MyPage.xaml" Inflator="Runtime" /> (force runtime inflation) -->
    <MauiXamlInflator>SourceGen</MauiXamlInflator>

    <!-- Display name -->
    <ApplicationTitle>MauiApp2</ApplicationTitle>

    <!-- App Identifier -->
    <ApplicationId>com.companyname.mauiapp2</ApplicationId>

    <!-- Versions -->
    <ApplicationDisplayVersion>1.0</ApplicationDisplayVersion>
    <ApplicationVersion>1</ApplicationVersion>

    <!-- To develop, package, and publish an app to the Microsoft Store, see: https://aka.ms/MauiTemplateUnpackaged -->
    <WindowsPackageType>None</WindowsPackageType>

    <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">15.0</SupportedOSPlatformVersion>
    <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'maccatalyst'">15.0</SupportedOSPlatformVersion>
    <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">23.0</SupportedOSPlatformVersion>
    <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</SupportedOSPlatformVersion>
    <TargetPlatformMinVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</TargetPlatformMinVersion>
  </PropertyGroup>

  <ItemGroup>
    <!-- App Icon -->
    <MauiIcon Include="Resources\AppIcon\appicon.svg" ForegroundFile="Resources\AppIcon\appiconfg.svg" Color="#512BD4" />

    <!-- Splash Screen -->
    <MauiSplashScreen Include="Resources\Splash\splash.svg" Color="#512BD4" BaseSize="128,128" />

    <!-- Images -->
    <MauiImage Include="Resources\Images\*" />
    <MauiImage Update="Resources\Images\dotnet_bot.png" Resize="True" BaseSize="300,185" />

    <!-- Custom Fonts -->
    <MauiFont Include="Resources\Fonts\*" />

    <!-- Raw Assets (also remove the "Resources\Raw" prefix) -->
    <MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
  </ItemGroup>

  <ItemGroup>
    <None Remove="Platforms\Android\Resources\values\strings.xml" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Maui.Controls" Version="10.0.51" />
    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="10.0.6" />
    <PackageReference Include="Plugin.Firebase" Version="4.0.0" />
    <PackageReference Include="Plugin.Firebase.Analytics" Version="4.0.0" />
    <PackageReference Include="Plugin.Firebase.Crashlytics" Version="4.0.0" />
  </ItemGroup>

  <ItemGroup Condition="'$(TargetFramework)' == 'net10.0-android'">
    <GoogleServicesJson Include="Platforms\Android\google-services.json" />
  </ItemGroup>

</Project>

After making all the changes, please clean and rebuild the project.

Click Log Analytics Event, then check the Analytics dashboard to see the result.
Click Force Test Crash, then restart the app and check the Crashlytics dashboard to see the crash report.

image (1)

image (2)

image (3)

image (4)

image (5)

I hope this helps. Please give it a try and let me know whether it works. Thank you for your patience.

Answer 2

Nancy Vo (WICLOUD CORPORATION) 2,655 Microsoft External Staff Moderator

Hi @Vignesh Palthurai ,

Thanks for your question.

In a normal Android app, Google’s Gradle tools automatically create that badge (the "build ID").

But in .NET MAUI, we’re not using normal Gradle, we use the Plugin.Firebase wrapper. The plugin brings in the real Crashlytics detective, but it doesn’t automatically create the badge.

I recommend some following steps:

Create (or open) the strings.xml file.

Go to this exact folder in your MAUI project: Platforms/Android/Resources/values/

Inside that folder, create a new file called strings.xml (if it doesn’t already exist).

Then, put this content inside strings.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="com.google.firebase.crashlytics.mapping_file_id">none</string>
    <!-- Optional safety line -->
    <string name="com.crashlytics.android.build_id">1.0</string>
</resources>

Set the Build Action correctly

Right-click the strings.xml file in Solution Explorer.
Choose Properties.
Set Build Action to AndroidResource (very important!).

Clean + Rebuild + Run Clean the solution → Rebuild → Run on Android device/emulator.

Make sure you initialize Firebase and enable Crashlytics in MauiProgram.cs. Add this code before builder.Build():

// Check Plugin.Firebase docs for the exact method in your version.
builder.ConfigureFirebase();

CrossFirebaseCrashlytics.Current.SetCrashlyticsCollectionEnabled(true);

If ConfigureFirebase() is not available, you can also try:

CrossFirebase.Initialize();

I hope this addresses your question. If this response was helpful, please consider following the guidance to provide feedback.

Vignesh Palthurai 0 Reputation points

2026-04-07T10:08:31.1833333+00:00
Hi @Nancy Vo (WICLOUD CORPORATION) ,

Thank you for your guidance.

I followed all the suggested steps:

Created the strings.xml file under Platforms/Android/Resources/values/

Added the required entries:

<string name="com.google.firebase.crashlytics.mapping_file_id">none</string> <string name="com.crashlytics.android.build_id">1.0</string>

Set the Build Action to AndroidResource

Cleaned and rebuilt the solution

Package Installation

Initially, I tried using the latest versions of all Plugin.Firebase packages. However, that resulted in errors during initialization.

So I removed everything and reinstalled all packages with the same version (4.0.0) using terminal:

dotnet add package Plugin.Firebase --version 4.0.0 dotnet add package Plugin.Firebase.Analytics --version 4.0.0 dotnet add package Plugin.Firebase.Crashlytics --version 4.0.0

I verified that all packages are now aligned to version 4.0.0.

Issue 1

When I use:

CrossFirebase.Initialize();

I get:

The name 'CrossFirebase' does not exist in the current context

Issue 2

When I try:

builder.ConfigureFirebase();

I get:

'MauiAppBuilder' does not contain a definition for 'ConfigureFirebase'

At this point, I have tried both initialization approaches:

CrossFirebase.Initialize() (older method)

builder.ConfigureFirebase() (newer method)

…but neither is working in my setup, even after aligning all package versions.

Clarification Needed

Could you please help clarify:

What is the correct initialization method for Plugin.Firebase version 4.0.0 in .NET MAUI?

Is there any additional configuration required that I might be missing?

If possible, could you share a minimal working example for this setup?

Additionally, my project is currently targeting .NET MAUI (net10.0-android).

From my understanding, .NET MAUI 10 is relatively new, and since Plugin.Firebase is a community-maintained library, there may be compatibility limitations or delays in full support for newer MAUI versions.

This might be a possible reason why neither CrossFirebase.Initialize() nor builder.ConfigureFirebase() is being recognized in my project.

Thanks in advance for your support !

Nancy Vo (WICLOUD CORPORATION) 2,655 Microsoft External Staff Moderator

Hi @Vignesh Palthurai ,

You can refer to this sample code:


using Microsoft.Maui.LifecycleEvents;
using Plugin.Firebase.Crashlytics;

#if ANDROID
using Plugin.Firebase.Core.Platforms.Android;
#endif

namespace MauiApp1
{
    public static class MauiProgram
    {
        public static MauiApp CreateMauiApp()
        {
            var builder = MauiApp.CreateBuilder();

            builder
                .UseMauiApp<App>()
                .ConfigureFonts(fonts =>
                {
                    fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
                });

            builder.RegisterFirebaseServices();

            return builder.Build();
        }

        private static MauiAppBuilder RegisterFirebaseServices(this MauiAppBuilder builder)
        {
            builder.ConfigureLifecycleEvents(events =>
            {
#if ANDROID
                events.AddAndroid(android => android.OnCreate((activity, _) =>
                {
                    CrossFirebase.Initialize(
                        activity,
                        () => Platform.CurrentActivity,
                        null);
                }));
#endif
            });

            CrossFirebaseCrashlytics.Current.SetCrashlyticsCollectionEnabled(true);

            return builder;
        }
    }
}

Please give it a try and let me know if it works as expected. Thank you.

Vignesh Palthurai 0 Reputation points

2026-04-08T14:18:43.1733333+00:00
Hi @Nancy Vo (WICLOUD CORPORATION) ,

Thank you for your response and the sample code.

I tried implementing the suggested approach using ConfigureLifecycleEvents and initializing Firebase inside the Android OnCreate lifecycle. However, I still encountered the following runtime exception:

Error:

Default FirebaseApp is not initialized in this process com.companyname.firebasepocapp.

To troubleshoot further, I attempted an alternative approach by initializing Firebase directly inside MainActivity before calling base.OnCreate():

protected override void OnCreate(Bundle? savedInstanceState) { CrossFirebase.Initialize( this, () => Microsoft.Maui.ApplicationModel.Platform.CurrentActivity, null, null); base.OnCreate(savedInstanceState); }

Unfortunately, this approach also did not resolve the issue, and the same exception persists at runtime.

At this point, it appears that Firebase is being accessed before initialization completes, possibly due to lifecycle timing or compatibility issues with .NET MAUI (.NET 10) and Plugin.Firebase (v4.0.0).

Could you please clarify:

Whether Plugin.Firebase v4.0.0 fully supports .NET MAUI (.NET 10)?

What is the recommended initialization point to ensure Firebase is initialized before FirebaseInitProvider is triggered?

Any guidance or confirmation would be greatly appreciated.

Thank you for your support.
Nancy Vo (WICLOUD CORPORATION) 2,655 Reputation points Microsoft External Staff Moderator

2026-04-09T03:24:12.3266667+00:00
Hi @Vignesh Palthurai .

This error means the native Firebase SDK (which Plugin.Firebase wraps) is being triggered before the google-services.json configuration has been fully applied by the Google Services plugin.

Plugin.Firebase v4.0.0 does support .NET 10 MAUI, but initialization on Android can be sensitive to:

Correct google-services.json setup

The strings.xml file for Crashlytics

Timing of the CrossFirebase.Initialize call

I suggest trying the following workarounds:

Double-check the google-services.json setup.

Delete the current `google-services.json from Platforms/Android/

Go back to Firebase Console → Your Android app → Download a fresh google-services.json

Add it again to Platforms/Android/

Set Build Action = GoogleServicesJson

Please make sure you have this to your .csprj file:

<ItemGroup Condition="'$(TargetFramework)' == 'net10.0-android'"> <GoogleServicesJson Include="Platforms\Android\google-services.json" /> </ItemGroup>

Clean solution -> rebuild solution.

Try this simpler initialization:

private static MauiAppBuilder RegisterFirebaseServices(this MauiAppBuilder builder) { builder.ConfigureLifecycleEvents(events => { #if ANDROID events.AddAndroid(android => android.OnCreate((activity, _) => { CrossFirebase.Initialize(activity); })); #endif }); CrossFirebaseCrashlytics.Current.SetCrashlyticsCollectionEnabled(true); return builder; }

Please do not forget the necessaring using statements:

using Microsoft.Maui.LifecycleEvents; using Plugin.Firebase.Analytics; using Plugin.Firebase.Crashlytics; #if ANDROID using Plugin.Firebase.Core.Platforms.Android; #endif

After making these changes, please Clean Solution → Rebuild Solution and run the app again.

Please try again and let me know if it works or if you get a different error message. Feel free to reach out to me. Thank you for your patience.
Vignesh Palthurai 0 Reputation points

2026-04-09T13:44:56.8733333+00:00

Hi @Nancy Vo (WICLOUD CORPORATION) ,

I received an email notification indicating that you replied, but I’m unable to see your response in the thread.

I’ve attached a screenshot of the email for reference. Could you please confirm or repost your reply?

Thank you for your support.
Vignesh Palthurai 0 Reputation points

2026-04-09T17:33:46.4566667+00:00
Hi @Nancy Vo (WICLOUD CORPORATION) ,

Thank you for your continued support and detailed guidance.

I carefully followed all the steps you suggested:

Downloaded a fresh google-services.json and placed it correctly

Set Build Action = GoogleServicesJson

Added the .csproj configuration for GoogleServicesJson

Ensured strings.xml is present for Crashlytics

Cleaned and rebuilt the solution

However, when I tried your latest suggestion:

CrossFirebase.Initialize(activity);

I encountered a compile-time error:

There is no argument given that corresponds to the required parameter 'activityLocator' of 'CrossFirebase.Initialize(Activity, Func, FirebaseOptions, string)'

This indicates that in Plugin.Firebase v4.0.0, the overload CrossFirebase.Initialize(activity) is not available, and the method requires additional parameters.

To address this, I also tried using the full overload:

CrossFirebase.Initialize( activity, () => Platform.CurrentActivity, null, null);

as well as initializing in different places (MauiProgram, MainActivity, and MainApplication.OnCreate), but the runtime exception still persists:

Default FirebaseApp is not initialized in this process com.companyname.firebasepocapp.

At this point, it seems there may be a mismatch between the suggested initialization approach and the actual API available in Plugin.Firebase v4.0.0, or a potential compatibility/timing issue with .NET MAUI (.NET 10).

Could you please help clarify:

What is the correct initialization signature for Plugin.Firebase v4.0.0 on Android?

Where exactly should initialization occur to ensure it runs before FirebaseInitProvider?

Is there a minimal working sample specifically for .NET MAUI (.NET 10) + Plugin.Firebase v4.0.0 ****(Analytics + Crashlytics)?

Thank you again for your time and support.
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Vignesh Palthurai 0 Reputation points

2026-04-09T17:43:45.78+00:00
Hi @Nancy Vo (WICLOUD CORPORATION) ,

Thank you for your continued support and detailed guidance.

I carefully followed all the steps you suggested:

Downloaded a fresh google-services.json and placed it correctly

Set Build Action = GoogleServicesJson

Added the .csproj configuration for GoogleServicesJson

Ensured strings.xml is present for Crashlytics

Cleaned and rebuilt the solution

However, when I tried your latest suggestion:

CrossFirebase.Initialize(activity);

I encountered a compile-time error:

There is no argument given that corresponds to the required parameter 'activityLocator' of 'CrossFirebase.Initialize(Activity, Func, FirebaseOptions, string)'

This indicates that in Plugin.Firebase v4.0.0, the overload CrossFirebase.Initialize(activity) is not available, and the method requires additional parameters.

To address this, I also tried using the full overload:

CrossFirebase.Initialize( activity, () => Platform.CurrentActivity, null, null);

as well as initializing in different places (MauiProgram, MainActivity, and MainApplication.OnCreate), but the runtime exception still persists:

Default FirebaseApp is not initialized in this process com.companyname.firebasepocapp.

At this point, it seems there may be a mismatch between the suggested initialization approach and the actual API available in Plugin.Firebase v4.0.0, or a potential compatibility/timing issue with .NET MAUI (.NET 10).

Could you please help clarify:

What is the correct initialization signature for Plugin.Firebase v4.0.0 on Android?

Where exactly should initialization occur to ensure it runs before FirebaseInitProvider?

Is there a minimal working sample specifically for .NET MAUI (.NET 10) + Plugin.Firebase v4.0.0**(Analytics + Crashlytics)**?

Thank you again for your time and support.
Nancy Vo (WICLOUD CORPORATION) 2,655 Reputation points Microsoft External Staff Moderator

2026-04-13T11:02:24.1733333+00:00

Hi @Vignesh Palthurai ,
I will test this on my device and update you as soon as possible.
Vignesh Palthurai 0 Reputation points

2026-04-15T13:37:02.51+00:00

Hi @Nancy Vo (WICLOUD CORPORATION) ,

Just following up on this issue. I wanted to check if you had a chance to test it on your side.

Please let me know if you need any additional details from me.

Thank you for your time.

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I am trying to integrate Firebase Analytics and Crashlytics into a .NET MAUI (.NET 10) Android application, but I am facing a runtime exception related to Crashlytics.

Error:

Questions:

2 answers

Package Installation

Issue 1

Issue 2

Clarification Needed

Your answer