[ARM 32-bit] Unable to start debugging with an android physical device (Hot Reload)

[ArtefactoDev]

Android framework version

net9.0-android

Affected platform version

VS 17.12.2, SDK 9.0.100, Windows 11 24H2

Description

The system compiles the code and sends it to the Android phone, however, after generating the .apk package in the system correctly, Visual Studio does not allow me to debug it.

I can open the generated package on my cell phone without errors, but I cannot debug it using 'hot reload' in any way.

Cell phone model: Motorola G(8)
Android Version: Android 10

Detail, on the same machine I have another application developed in Xamarin for the same cell phone, and I can debug it normally.

Steps to Reproduce

Video Error:
https://github.com/user-attachments/assets/4260e896-6c6a-4fd8-9101-87aff3ee9893

1 - Start Visual Studio
2 - Create a New Project
3 - .NET MAUI App (name: ExemploAndroid)

4 - Net 9
('include sample content' NOT selected)

Change the file 'ExemploAndroid.csproj' to:

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

  <PropertyGroup>
    <TargetFrameworks>net9.0-android;net9.0-ios;net9.0-maccatalyst</TargetFrameworks>
    <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net9.0-windows10.0.19041.0</TargetFrameworks>
    <!-- Uncomment to also build the tizen app. You will need to install tizen by following this: https://github.com/Samsung/Tizen.NET -->
    <!-- <TargetFrameworks>$(TargetFrameworks);net9.0-tizen</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>ExemploAndroid</RootNamespace>
    <UseMaui>true</UseMaui>
    <SingleProject>true</SingleProject>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>

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

    <!-- App Identifier -->
    <ApplicationId>com.companyname.exemploandroid</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'">28.0</SupportedOSPlatformVersion>
    <RuntimeIdentifiers Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">android-arm;android-arm64;android-x86;android-x64;</RuntimeIdentifiers>
    <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</SupportedOSPlatformVersion>
    <TargetPlatformMinVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</TargetPlatformMinVersion>
    <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'tizen'">6.5</SupportedOSPlatformVersion>
  </PropertyGroup>

  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net9.0-android|AnyCPU'">
    <EmbedAssembliesIntoApk>true</EmbedAssembliesIntoApk>
    <!--<AndroidSupportedAbis>true</AndroidSupportedAbis>-->
    <!-- <AndroidCreatePackagePerAbi>True</AndroidCreatePackagePerAbi>-->
  </PropertyGroup>

  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|net9.0-android|AnyCPU'">
    <EmbedAssembliesIntoApk>true</EmbedAssembliesIntoApk>
    <!-- <AndroidCreatePackagePerAbi>True</AndroidCreatePackagePerAbi>-->
  </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>
    <PackageReference Include="Microsoft.Maui.Controls" Version="9.0.10" />
    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="9.0.0" />
  </ItemGroup>

</Project>

Plug in your cell phone (already configured in developer mode), choose to debug and after deployment, Visual Studio stops debugging.

Did you find any workaround?

unfortunately not.

Relevant log output

Build started at 21:20...
1>------ Build started: Project: ExemploAndroid, Configuration: Debug Any CPU ------
1>Skipping analyzers to speed up the build. You can execute 'Build' or 'Rebuild' command to run analyzers.
1>Including assemblies for Hot Reload support
1>ExemploAndroid -> C:\Users\workc\source\repos\ExemploAndroid\bin\Debug\net9.0-android\ExemploAndroid.dll
2>------ Deploy started: Project: ExemploAndroid, Configuration: Debug Any CPU ------
2>Starting deployment to Motorola moto g(8) play ...
2>Deploying to Motorola moto g(8) play ...
Build started.
Project "ExemploAndroid.csproj" (Install target(s)):
There is no application host available for the specified RuntimeIdentifier 'android-arm'.
There is no application host available for the specified RuntimeIdentifier 'android-arm64'.
There is no application host available for the specified RuntimeIdentifier 'android-x86'.
There is no application host available for the specified RuntimeIdentifier 'android-x64'.
Found Java SDK version 17.0.12.
MonoAndroid Tools: c:\program files\dotnet\packs\Microsoft.Android.Sdk.Windows\35.0.7\tools\
Android Platform API level: 35
TargetFrameworkVersion: v9.0
Android NDK: 
Android SDK: C:\Program Files (x86)\Android\android-sdk\
Android SDK Build Tools: C:\Program Files (x86)\Android\android-sdk\build-tools\35.0.0\
Java SDK: C:\Program Files (x86)\Android\openjdk\jdk-17.0.12\Application Java class: android.app.Application
_OuterIntermediateOutputPath: IntermediateOutputPath: obj\Debuget9.0-android\
Skipping target "ProcessMauiSplashScreens" because all output files are up-to-date with respect to the input files.
Skipping target "ProcessMauiFonts" because all output files are up-to-date with respect to the input files.
Skipping target "ResizetizeImages" because all output files are up-to-date with respect to the input files.
Skipping target "_ResolveLibraryProjectImports" because all output files are up-to-date with respect to the input files.
Skipping target "_BuildLibraryImportsCache" because all output files are up-to-date with respect to the input files.
Skipping target "_GenerateResourceCaseMap" because all output files are up-to-date with respect to the input files.
Skipping target "_GenerateResourceDesignerIntermediateClass" because all output files are up-to-date with respect to the input files.
Skipping target "_GenerateLayoutBindings" because it has no outputs.
Skipping target "_ConvertResourcesCases" because all output files are up-to-date with respect to the input files.
Skipping target "_CompileResources" because all output files are up-to-date with respect to the input files.
Skipping target "_PrepareUpdateAndroidResgen" because all output files are up-to-date with respect to the input files.
Skipping target "_UpdateAndroidResgen" because all output files are up-to-date with respect to the input files.
Project "ExemploAndroid.csproj" (_ComputeFilesToPublishForRuntimeIdentifiers target(s)):
There is no application host available for the specified RuntimeIdentifier 'android-arm'.
There is no application host available for the specified RuntimeIdentifier 'android-arm64'.
There is no application host available for the specified RuntimeIdentifier 'android-x86'.
There is no application host available for the specified RuntimeIdentifier 'android-x64'.
_OuterIntermediateOutputPath: obj\Debuget9.0-android\IntermediateOutputPath: obj\Debuget9.0-android\android-arm\
Done building project "ExemploAndroid.csproj".
Project "ExemploAndroid.csproj" (_ComputeFilesToPublishForRuntimeIdentifiers target(s)):
There is no application host available for the specified RuntimeIdentifier 'android-arm'.
There is no application host available for the specified RuntimeIdentifier 'android-arm64'.
There is no application host available for the specified RuntimeIdentifier 'android-x86'.
There is no application host available for the specified RuntimeIdentifier 'android-x64'.
_OuterIntermediateOutputPath: obj\Debuget9.0-android\IntermediateOutputPath: obj\Debuget9.0-android\android-arm64\Done building project "ExemploAndroid.csproj".
Project "ExemploAndroid.csproj" (_ComputeFilesToPublishForRuntimeIdentifiers target(s)):
There is no application host available for the specified RuntimeIdentifier 'android-arm'.
There is no application host available for the specified RuntimeIdentifier 'android-arm64'.
There is no application host available for the specified RuntimeIdentifier 'android-x86'.
There is no application host available for the specified RuntimeIdentifier 'android-x64'.
_OuterIntermediateOutputPath: obj\Debuget9.0-android\IntermediateOutputPath: obj\Debuget9.0-android\android-x86\Done building project "ExemploAndroid.csproj".
Project "ExemploAndroid.csproj" (_ComputeFilesToPublishForRuntimeIdentifiers target(s)):
There is no application host available for the specified RuntimeIdentifier 'android-arm'.
There is no application host available for the specified RuntimeIdentifier 'android-arm64'.
There is no application host available for the specified RuntimeIdentifier 'android-x86'.
There is no application host available for the specified RuntimeIdentifier 'android-x64'.
_OuterIntermediateOutputPath: obj\Debuget9.0-android\IntermediateOutputPath: obj\Debuget9.0-android\android-x64\Done building project "ExemploAndroid.csproj".
Skipping target "_LinkAssembliesNoShrink" because all output files are up-to-date with respect to the input files.
Skipping target "_GenerateJavaStubs" because all output files are up-to-date with respect to the input files.
Skipping target "_ManifestMerger" because all output files are up-to-date with respect to the input files.
Skipping target "_ConvertCustomView" because all output files are up-to-date with respect to the input files.
Skipping target "_AddStaticResources" because all output files are up-to-date with respect to the input files.
Skipping target "_GeneratePackageManagerJava" because all output files are up-to-date with respect to the input files.
Skipping target "_GenerateAndroidAssetsDir" because all output files are up-to-date with respect to the input files.
Skipping target "_PrepareCreateBaseApk" because all output files are up-to-date with respect to the input files.
Skipping target "_CreateBaseApk" because all output files are up-to-date with respect to the input files.
Skipping target "_CompileJava" because all output files are up-to-date with respect to the input files.
Skipping target "_CompileNativeAssemblySources" because all output files are up-to-date with respect to the input files.
Skipping target "_CreateApplicationSharedLibraries" because all output files are up-to-date with respect to the input files.
Skipping target "_CompileToDalvik" because all output files are up-to-date with respect to the input files.
Deleting file "bin\Debuget9.0-android\com.companyname.exemploandroid.apk".
Copying file from "C:\Users\workc\source\repos\ExemploAndroid\obj\Debug
et9.0-android\android\bin\com.companyname.exemploandroid.apk" to "C:\Users\workc\source\repos\ExemploAndroid\bin\Debug
et9.0-android\com.companyname.exemploandroid.apk".
Touching "obj\Debug
et9.0-android\android_debug_keystore.flag".
Deleting file "C:\Users\workc\source\repos\ExemploAndroid\bin\Debug
et9.0-android\com.companyname.exemploandroid-Signed.apk".
C:\Program Files (x86)\Android\android-sdk\build-tools\35.0.0\zipalign.exe -p 16 "obj\Debug
et9.0-android\android\bin\com.companyname.exemploandroid.apk" "bin\Debug
et9.0-android\\com.companyname.exemploandroid-Signed.apk" 
C:\Program Files (x86)\Android\openjdk\jdk-17.0.12\bin\java.exe -jar "C:\Program Files (x86)\Android\android-sdk\build-tools\35.0.0\lib\apksigner.jar" sign --ks "C:\Users\workc\AppData\Local\Xamarin\Mono for Android\debug.keystore" --ks-pass pass:android --ks-key-alias androiddebugkey --key-pass pass:android --min-sdk-version 28 --max-sdk-version 35  bin\Debug
et9.0-android\com.companyname.exemploandroid-Signed.apk 
Signed android package 'bin\Debug
et9.0-android\com.companyname.exemploandroid-Signed.apk'
Using cached value from RegisterTaskObject
Found device: 0062963070
Forwarding debugger port 8805
Detecting existing process
> am start -a "android.intent.action.MAIN" -c "android.intent.category.LAUNCHER" -n "com.companyname.exemploandroid/crc64358cda76bdc6f75f.MainActivity"
> Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.companyname.exemploandroid/crc64358cda76bdc6f75f.MainActivity }
[.exemploandroi] Late-enabling -Xcheck:jni
[.exemploandroi] Unknown bits set in runtime_flags: 0x8000
[DOTNET] AndroidCryptoNative_InitLibraryOnLoad: jint AndroidCryptoNative_InitLibraryOnLoad(JavaVM *, void *) in /__w/1/s/src/native/libs/System.Security.Cryptography.Native.Android/pal_jni.c
[DOTNET] GetOptionalClassGRef: optional class com/android/org/conscrypt/OpenSSLEngineImpl was not found
[monodroid] Failed to create directory '/data/user/0/com.companyname.exemploandroid/files/.__override__/armeabi-v7a'. No such file or directory
[monodroid] Creating public update directory: `/data/user/0/com.companyname.exemploandroid/files/.__override__/armeabi-v7a`
[.exemploandroi] Attempt to remove non-JNI local reference, dumping thread
[monodroid-debug] Trying to initialize the debugger with options: --debugger-agent=transport=dt_socket,loglevel=0,address=127.0.0.1:8805,server=y,embedding=1,timeout=8
[monodroid-assembly] Unable to open app library directory '/data/user/0/com.companyname.exemploandroid/files/.__override__/armeabi-v7a': No such file or directory
[mono] Listening on 127.0.0.1:8805 (timeout=8 ms)...
[mono] debugger-agent: Timed out waiting to connect.

[jonathanpeppers]

I cannot debug it using 'hot reload' in any way.

This phrasing is confusing, are you trying to debug or use hot reload? The error looks like the debugger is not connecting.

Change the file 'ExemploAndroid.csproj' to:

Does the default template with no changes work? What change did you make that "breaks" things?

The error looks like what you would see if you put the emulator in airplane mode, for example.

[ArtefactoDev]

This phrasing is confusing, are you trying to debug or use hot reload? The error looks like the debugger is not connecting.

I can't debug when I try to use a physical Android device.

Does the default template with no changes work?

No work.
if you try to generate a default template (same Steps to Reproduce ) and try to debug (without any modification) using a physical Android device you will receive the following error:

ADB0020: Mono.AndroidTools.IncompatibleCpuAbiException: The package does not support the CPU architecture of this device

Shouldn't the template, without any modifications, work without errors?

What change did you make that "breaks" things?

Basically, trying to get around the 'ADB0020' error, I only added these lines:

<RuntimeIdentifiers Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">android-arm;android-arm64;android-x86;android-x64;</RuntimeIdentifiers>

<PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net9.0-android|AnyCPU'"> <EmbedAssembliesIntoApk>true</EmbedAssembliesIntoApk> </PropertyGroup>

[jonathanpeppers]

if you try to generate a default template (same Steps to Reproduce ) and try to debug (without any modification) using a physical Android device you will receive the following error:

I do this daily, and it is working for me. What device are you using? Can you share a .binlog of the failure? https://aka.ms/binlog

ADB0020: Mono.AndroidTools.IncompatibleCpuAbiException: The package does not support the CPU architecture of this device

ADB0020 is a completely different issue than debugging or hot reload. It means the deploy failed.

Is the device a 32-bit device? If so, you would need to list android-arm as a RuntimeIdentifier as you tried:

<RuntimeIdentifiers Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">android-arm;android-arm64;android-x64;</RuntimeIdentifiers>

A .binlog would allow us to investigate further, thanks!

[ArtefactoDev]

do this daily, and it is working for me. What device are you using?

Not for me, even using the default template without any changes
It works normally if I use the Android emulator, but not with the physical device.

Are you trying an emulator or are you trying to use a physical device for this test? because in the emulator it works normally.
Physical device: Motorola G(8) (Android 10)

Can you share a .binlog of the failure? https://aka.ms/binlog

I attributed the log to open ticket to try to help.EngineTrace_4472.txt
EngineTrace_12004.txt
EngineTrace_23944.txt
EngineTrace_26780.txt
EngineTrace_27524.txt
EngineTrace_28940.txt
EngineTrace_29052.txt
MSBuild_CommTrace_PID_4472.txt
MSBuild_CommTrace_PID_12004.txt
MSBuild_CommTrace_PID_23944.txt
MSBuild_CommTrace_PID_26780.txt
MSBuild_CommTrace_PID_27524.txt
MSBuild_CommTrace_PID_28940.txt
MSBuild_CommTrace_PID_29052.txt
SchedulerState_12004.txt
SchedulerTrace_12004.txt

ADB0020 is a completely different issue than debugging or hot reload. It means the deploy failed.

I know, I explained what happens when you try to debug a physical device using the default template, without any changes.
I just find it strange that the default template without any changes, but with .Net 8 (templante default) works without any problems...

Is the device a 32-bit device? If so, you would need to list android-arm as a RuntimeIdentifier as you tried: (...)

I added all the code from the 'csproj' project to the ticket.
I tried what you said, but it still didn't work.

Maybe the problem is with arm.. But, don't you agree that this should already come by default in the default template, if we consider that more than 90% of the time we will come across ARM devices on Android?

Thank you very much for the excellent help, I'm sure the team will solve it! Because you are excellent!