Default FirebaseApp is not initialized

[mirogrg1]

Android framework version

net8.0-android

Affected platform version

VS 2022 17.12.3, .NET 8

Description

I keep getting this error in my .NET MAUI Android app while using Xamarin.Firebase.Messaging package, which is referenced in https://learn.microsoft.com/en-us/dotnet/maui/data-cloud/push-notifications?view=net-maui-9.0 :

Java.Lang.IllegalStateException: 'Default FirebaseApp is not initialized in this process com.tendrils. Make sure to call FirebaseApp.initializeApp(Context) first.'

Project file:

<?xml version="1.0" encoding="utf-8"?>
<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFrameworks>net8.0-android;net8.0-ios</TargetFrameworks>    
    <OutputType>Exe</OutputType>
    <RootNamespace>Tendrils</RootNamespace>
    <UseMaui>true</UseMaui>
    <SingleProject>true</SingleProject>
    <ImplicitUsings>enable</ImplicitUsings>
    <!-- Display name -->
    <ApplicationTitle>Tendrils</ApplicationTitle>
    <!-- App Identifier -->
    <ApplicationId>com.tendrils</ApplicationId>
    <!-- Versions -->
    <ApplicationDisplayVersion>1.0</ApplicationDisplayVersion>
    <ApplicationVersion>1</ApplicationVersion>
    <!-- Required for C# Hot Reload -->
    <UseInterpreter Condition="'$(Configuration)' == 'Debug'">True</UseInterpreter>
    <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">14.2</SupportedOSPlatformVersion>
    <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">28.0</SupportedOSPlatformVersion>
  </PropertyGroup>
  	<PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net8.0-ios|AnyCPU'">
		<ForceSimulatorX64ArchitectureInIDE>true</ForceSimulatorX64ArchitectureInIDE>
	</PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)' == 'Debug'">
    <EmbedAssembliesIntoApk>true</EmbedAssembliesIntoApk>
    <!--<UseInterpreter>false</UseInterpreter>-->
    <_MauiForceXamlCForDebug>true</_MauiForceXamlCForDebug>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net8.0-ios|AnyCPU'">
    <CreatePackage>false</CreatePackage>
    <MtouchUseLlvm>True</MtouchUseLlvm>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|net8.0-ios|AnyCPU'">
    <CreatePackage>false</CreatePackage>
    <MtouchLink>SdkOnly</MtouchLink>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net8.0-android34.0|AnyCPU'">
    <EmbedAssembliesIntoApk>True</EmbedAssembliesIntoApk>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net8.0-android|AnyCPU'">
    <EmbedAssembliesIntoApk>False</EmbedAssembliesIntoApk>
  </PropertyGroup>
  <PropertyGroup Condition="'$(TargetFramework)'=='net8.0-ios'">
    <CodesignKey>Apple Development: Created via API (27L59SNA97)</CodesignKey>
    <CodesignProvision>VS: com.trellise.tendrl Development</CodesignProvision>
  </PropertyGroup> 
  <ItemGroup>
    <!-- App Icon -->
    <MauiIcon Include="Resources\AppIcon\appicon.svg" ForegroundFile="Resources\AppIcon\appicon2.svg" ForegroundScale="0.50" />
    <!-- Splash Screen -->
     <MauiSplashScreen Include="Resources\Splash\splash.svg" Color="#3F75FF" />
    <!-- Images -->
    <MauiImage Include="Resources\Images\*" />
    <MauiImage Include="Resources\Images\TabIcons\*" BaseSize="28,28" />
    <!-- Custom Fonts -->
    <MauiFont Include="Resources\Fonts\*" />
    <!-- Raw Assets (also remove the "Resources\Raw" prefix) -->
    <MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
    <MauiImage Include="Resources\Images\SocialMediaLogos\*" />
  </ItemGroup>
  <ItemGroup>
    <Compile Remove="Resources\NewFolder\**" />
    <EmbeddedResource Remove="Resources\NewFolder\**" />
    <MauiCss Remove="Resources\NewFolder\**" />
    <MauiXaml Remove="Resources\NewFolder\**" />
    <None Remove="Resources\NewFolder\**" />
  </ItemGroup>
  <ItemGroup>
    <AndroidAsset Remove="Platforms\Android\Assets\tendrils.ttf" />
  </ItemGroup>
  <ItemGroup>
    <None Remove="GrialLicense" />  
    <None Remove="Platforms\iOS\Resources\tendrils.ttf" />  
  </ItemGroup>
<ItemGroup Condition="'$(TargetFramework)' == 'net8.0-android'">
  <GoogleServicesJson Include="Platforms\Android\google-services.json" />
</ItemGroup>
  <ItemGroup>
    <EmbeddedResource Include="GrialLicense" />
  </ItemGroup>  
  <ItemGroup>
    <PackageReference Include="AiForms.Maui.SettingsView" Version="1.0.16" />
    <PackageReference Include="Azure.Storage.Blobs" Version="12.23.0" />
    <PackageReference Include="Azure.Storage.Common" Version="12.22.0" />
    <PackageReference Include="Microsoft.AppCenter" Version="5.0.6" />
    <PackageReference Include="Microsoft.AppCenter.Analytics" Version="5.0.6" />
    <PackageReference Include="Microsoft.AppCenter.Crashes" Version="5.0.6" />
    <PackageReference Include="Microsoft.AspNet.SignalR.Client" Version="2.4.3" />
    <PackageReference Include="Microsoft.Graph" Version="5.67.0" />
    <PackageReference Include="Microsoft.Identity.Client" Version="4.66.2" />
    <PackageReference Include="Microsoft.Maui.Controls" Version="8.0.82" />
    <PackageReference Include="Microsoft.Maui.Controls.Compatibility" Version="8.0.82" />
    <PackageReference Include="Mopups" Version="1.3.2" />
    <PackageReference Include="CommunityToolkit.Maui" Version="9.0.1" />
    <PackageReference Include="Plugin.MauiMTAdmob" Version="1.7.1" />
    <PackageReference Include="sqlite-net-pcl" Version="1.9.172" />
    <PackageReference Include="System.Net.Http" Version="4.3.4" />
    <PackageReference Include="System.Text.RegularExpressions" Version="4.3.1" />
    <PackageReference Include="UXDivers.GrialMaui" Version="4.2.117" />
    <PackageReference Include="UXDivers.GrialMaui.Maps" Version="4.2.114" />
    <PackageReference Include="WindowsAzure.MobileServices" Version="1.3.2" />
  </ItemGroup>
  <ItemGroup>   
    <Page Include="Resources\AppIcon\appicon.svg">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </Page>
  </ItemGroup>
  <ItemGroup>
    <EmbeddedResource Update="Resx\AppResources.resx">
      <Generator>PublicResXFileCodeGenerator</Generator>
      <LastGenOutput>AppResources.Designer.cs</LastGenOutput>
    </EmbeddedResource>
  </ItemGroup>
  <ItemGroup>
    <Compile Update="Resx\AppResources.Designer.cs">
      <DependentUpon>AppResources.resx</DependentUpon>
    </Compile>
  </ItemGroup>
  <ItemGroup Condition="'$(TargetFramework)' == 'net8.0-android34.0'">
    <PackageReference Include="Xamarin.Firebase.Messaging">
      <Version>124.1.0</Version>
    </PackageReference>
  </ItemGroup>
  <ItemGroup>
    <Folder Include="Platforms\Android\Renderers\" />
  </ItemGroup>
  <ItemGroup Condition="'$(TargetFramework)' == 'net8.0-android'">
    <PackageReference Include="Xamarin.Firebase.Messaging">
      <Version>124.1.0</Version>
    </PackageReference>
  </ItemGroup>
  <ItemGroup>
    <MauiFont Include="Platforms\Android\Assets\tendrils.ttf" />
    <MauiFont Include="Platforms\iOS\Resources\tendrils.ttf" />
  </ItemGroup>
</Project>

Steps to Reproduce

1. Using Visual Studio 2022 create a new .NET MAUI app
2. Follow the tutorial here to enable notifications
3. Run the app targeting Android 14 - API 34
4. Observe the following runtime error: Java.Lang.IllegalStateException: 'Default FirebaseApp is not initialized in this process com.tendrils. Make sure to call FirebaseApp.initializeApp(Context) first.'

Did you find any workaround?

No response

Relevant log output

10:57:49:289	[mono-rt] 	at com.google.firebase.FirebaseApp.getInstance(FirebaseApp.java:179)
10:57:49:289	[mono-rt] 	at com.google.firebase.messaging.FirebaseMessaging.getInstance(FirebaseMessaging.java:120)
10:57:49:289	[mono-rt] 	at crc6487f8e260309c87d5.MainActivity.n_onCreate(Native Method)
10:57:49:289	[mono-rt] 	at crc6487f8e260309c87d5.MainActivity.onCreate(MainActivity.java:44)
10:57:49:289	[mono-rt] 	at android.app.Activity.performCreate(Activity.java:8595)
10:57:49:289	[mono-rt] 	at android.app.Activity.performCreate(Activity.java:8573)
10:57:49:289	[mono-rt] 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1456)
10:57:49:347	[mono-rt] 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3764)
10:57:49:347	[mono-rt] 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3922)
10:57:49:347	[mono-rt] 	at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)
10:57:49:347	[mono-rt] 	at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:139)
10:57:49:347	[mono-rt] 	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:96)
10:57:49:347	[mono-rt] 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2443)
10:57:49:347	[mono-rt] 	at android.os.Handler.dispatchMessage(Handler.java:106)
10:57:49:347	[mono-rt] 	at android.os.Looper.loopOnce(Looper.java:205)
10:57:49:347	[mono-rt] 	at android.os.Looper.loop(Looper.java:294)
10:57:49:347	[mono-rt] 	at android.app.ActivityThread.main(ActivityThread.java:8177)
10:57:49:347	[mono-rt] 	at java.lang.reflect.Method.invoke(Native Method)
10:57:49:349	[mono-rt] 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:552)
10:57:49:349	[mono-rt] 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:971)
10:57:49:349	[mono-rt]