xamarin-android | Android provides open-source bindings | Android library

I have an Application that use Xamarin.FireBase.Messaging, and it works on all <12 android version.

When I try to buil my App in Android 12 it apears this error:

"*Severity Code Description Project File Line Suppression State Error ADB0010: Mono.AndroidTools.InstallFailedException: Unexpected install output: Failure [INSTALL_PARSE_FAILED_MANIFEST_MALFORMED: Failed parse during installPackageLI: /data/app/vmdl254956208.tmp/base.apk (at Binary XML file line #40): crc64bb777672d9471d38.CustomFirebaseMessagingService: Targeting S+ (version 31 and above) requires that an explicit value for android:exported be defined when intent filters are present] at Mono.AndroidTools.Internal.AdbOutputParsing.CheckInstallSuccess(String output, String packageName) in /Users/builder/azdo/_work/1/s/xamarin-android/external/monodroid/tools/msbuild/external/androidtools/Mono.AndroidTools/Internal/AdbOutputParsing.cs:line 357 at System.Threading.Tasks.Task.Execute() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at AndroidDeviceExtensions.d__12.MoveNext() in /Users/builder/azdo/_work/1/s/xamarin-android/external/monodroid/tools/msbuild/external/androidtools/Xamarin.AndroidTools/Devices/AndroidDeviceExtensions.cs:line 206 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at AndroidDeviceExtensions.d__12.MoveNext() in /Users/builder/azdo/_work/1/s/xamarin-android/external/monodroid/tools/msbuild/external/androidtools/Xamarin.AndroidTools/Devices/AndroidDeviceExtensions.cs:line 223 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Xamarin.Android.Tasks.FastDeploy.d__105.MoveNext() in /Users/builder/azdo/_work/1/s/xamarin-android/external/monodroid/tools/msbuild/Tasks/FastDeploy.cs:line 339 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at Xamarin.Android.Tasks.FastDeploy.d__105.MoveNext() in /Users/builder/azdo/_work/1/s/xamarin-android/external/monodroid/tools/msbuild/Tasks/FastDeploy.cs:line 356 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Xamarin.Android.Tasks.FastDeploy.d__100.MoveNext() in /Users/builder/azdo/_work/1/s/xamarin-android/external/monodroid/tools/msbuild/Tasks/FastDeploy.cs:line 213 0 *"

I think that I add all the Attributes "android:exported".

This is my manifest:

I created an appsettings file for a MAUI app and loading it in the IConfiguration using .Host.ConfigureAppConfiguration on the builder from a MauiApp.CreateBuilder(); I can access the file in Windows but not when running the Android emulator. The code:

I want to create a GUI in C# that will be used to run keytool on cmd.exe behind the scenes to create a keystore, including a key, and certificate data.

Input data then requires

• Keystore path
• Password
• Key alias
• Key password
• Validity
• Certificate info (cn, ou, o, l, st and c)

Unfortunately people may type special characters in their passwords and also space is allowed in the certificate info.

Overall I am worried someone may input some information somewhere that can result in a disastrous command running behind the scenes once this is called (like rm -rf *).

Is there a way to pass a java properties file with the input information to keytool or is there any way that I can safely escape all the data that is passed as string parameters to keytool?

I could not find any type of file that keytool could take, even in separate steps, that would eliminate this issue.

here's the unsafe code (warning: IT'S UNSAFE!!):

I'm kinda new to xamarin. I got this error when I'm switching from debug mode to release mode, I search everywhere but I got no answer.

How would I create a Xamarin.Android project that targets .NET 6 (Xamarin.Android being the traditional Android bindings, not .NET MAUI)?

Creating a new project from the Visual Studio 2022 UI generates the same Mono template Visual Studio 2019 does.

This guide seems to suggest manually editing the .csproj file, but doing that breaks the build with errors like:

Package Xamarin.AndroidX.AppCompat 1.3.1.3 is not compatible with monoandroid50 (MonoAndroid,Version=v5.0)

Error only occurs when compiling on release mode... on debug mode the compiling occurs without problem... can you help me?

This is the stack trace for error...

When I attach pdf and doc files using Recent files I'm getting the following exception. Can anyone help on this. Working fine when i attach image file using Recent files please help on this I m new to this Xamarin forms.

Thanks in advance.

I'm trying to write my first cross platform app in Xamarin using mvvm. The app records items (payments) inserted by the user and does some stuff (previsions and other math).

I wrote the code to add/update/delete/show items and when a item is added the app save the item writing a file with a custom extension (*.dinero) that contains all information about the item, so asynchronously the app load all files at the start.

I embedded a function that send by email these files in order to allow to another user to add the same item to its items list.

My question is how can I associate the the custom file extension to my app and how implement a procedure that open the "newItempage" to allow the user to save the item to its files?

I found the question Associate file extension with Xamarin Android application but I can't understand how to use it (where i have to write the code reported in the answer).

I would love to add a widget to my Android app, which is being developed using Uno Platform.

I found some tutorials how to do it in Xamarin, but don't know if it will work.

One of the tutorials: https://marcofolio.net/app-widget-xamarin-android/

Thanks!