I have a Xamarin.Forms app which I had to update from 3.6 to 4.7. Unfortunately, the Android app does not build anymore. Following error occurs:
2> C:\Foo\90\android\src\crc643f46942d9dd1fff9\FormsAppCompatActivity.java:4: error: cannot access TaskStackBuilder
2> public class FormsAppCompatActivity
2> ^
2> class file for android.support.v4.app.TaskStackBuilder not found
2>C:\Foo\90\android\src\crc643f46942d9dd1fff9\FormsAppCompatActivity.java(4,8): javac.exe error JAVAC0000: error: cannot access TaskStackBuilder
2>C:\Foo\90\android\src\crc643f46942d9dd1fff9\FormsAppCompatActivity.java(4,8): javac.exe error JAVAC0000: public class FormsAppCompatActivity
2>C:\Foo\90\android\src\crc643f46942d9dd1fff9\FormsAppCompatActivity.java(4,8): javac.exe error JAVAC0000: class file for android.support.v4.app.TaskStackBuilder not found
I have tried following solutions:
Updated all NuGet packages to the newest stable versions
Removed and reinstalled the Xamarin.Android.Support.v4 package (28.0.0.3)
Cleaned solution, deleted bin and obj folders and restarted the IDE
Tried the same and also deleting the C:\Foo and C:\Users[UserName]\AppData\Local\Xamarin folder
I have also tried enabling multi-dexing and setting the dev compiler to d8
I am using:
Microsoft Visual Studio Professional 2019 Version 16.6.5
Xamarin.Android uses 9.0 as a target framework version
Does somebody have any hints towards a solution for this issue? An extensive internet search did not lead to any useful results.
About installing Xamarin.Android.Support.v4 package can refer to this discussion .
When updating Nuget Package , if there are many packages need to be updated , you'd better select Select all packages to update them .Becaues of updating them one by one , there is a possible that occurs conflicts when updating part of them .
Such as updating as follow steps :
It seems like updating my project's TargetFramework from netstandard1.6.1 to netstandard2.0 solved the issue.
Related
I am using Google Firestore in my Xamarin forms app and after updating the Xamarin.Firebase.Firestore Nuget Package to the latest version, I am no longer able to debug my project on Android.
I made a new Xamarin Forms Project to first to check if the error was because of my code or because of an issue with the Nuget Package itself.
I then installed the Xamarin.Firebase.Firestore Nuget Package and quickly found that the problem wasn't with my code, it was with the Nuget Package.
If you are trying to install the Xamarin.Firebase.Firestore Nuget Package and you dont have the Xamarin.AndroidX.Core and Xamarin.AndroidX.Browser Nuget Packages installed, it will say "Could not add Xamarin.Firebase.Firestore" and show a really long error message. This is very annoying because it gives you a novel to read through instead of simply showing a prompt to install the Nuget Packages as dependencies alongside the parent Nuget Package.
Then in order to install the Xamarin.AndroidX.Browser Nuget Package, you first need to install the Xamarin.AndroidX.Core Nuget Package. If you don't install the Xamarin.AndroidX.Core Nuget Package first you will get another long error message saying that you need to install it.
After I install all three Nuget Packages and try to run my Android Project, I get this error message:
/Users/{UserName}/Desktop/FirebaseTests/FirebaseTests/FirebaseTests.Android: Error JAVA0000: Error in /Users/{UserName}/.nuget/packages/xamarin.google.guava/31.1.0.3/buildTransitive/monoandroid12.0/../../jar/guava.jar:com/google/common/annotations/Beta.class:
Type com.google.common.annotations.Beta is defined multiple times: /Users/{UserName}/.nuget/packages/xamarin.google.guava/31.1.0.3/buildTransitive/monoandroid12.0/../../jar/guava.jar:com/google/common/annotations/Beta.class, obj/Debug/lp/102/jl/__reference__guava.jar:com/google/common/annotations/Beta.class
Compilation failed
java.lang.RuntimeException: com.android.tools.r8.CompilationFailedException: Compilation failed to complete, origin: /Users/{UserName}/.nuget/packages/xamarin.google.guava/31.1.0.3/buildTransitive/monoandroid12.0/../../jar/guava.jar
com/google/common/annotations/Beta.class
at com.android.tools.r8.internal.Bj.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:98)
at com.android.tools.r8.D8.main(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:4)
Caused by: com.android.tools.r8.CompilationFailedException: Compilation failed to complete, origin: /Users/{UserName}/.nuget/packages/xamarin.google.guava/31.1.0.3/buildTransitive/monoandroid12.0/../../jar/guava.jar:com/google/common/annotations/Beta.class
at Version.fakeStackEntry(Version_3.3.28.java:0)
at com.android.tools.r8.internal.Bj.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:75)
at com.android.tools.r8.internal.Bj.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:28)
at com.android.tools.r8.internal.Bj.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:27)
at com.android.tools.r8.internal.Bj.b(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:2)
at com.android.tools.r8.D8.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:22)
at com.android.tools.r8.D8.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:17)
at com.android.tools.r8.internal.Bj.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:85)
... 1 more
Caused by: com.android.tools.r8.internal.f: Type com.google.common.annotations.Beta is defined multiple times: /Users/{UserName}/.nuget/packages/xamarin.google.guava/31.1.0.3/buildTransitive/monoandroid12.0/../../jar/guava.jar:com/google/common/annotations/Beta.class, obj/Debug/lp/102/jl/__reference__guava.jar:com/google/common/annotations/Beta.class
at com.android.tools.r8.internal.DT.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:14)
at com.android.tools.r8.internal.DT.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:22)
at com.android.tools.r8.internal.CN.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:33)
at com.android.tools.r8.internal.CN.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:10)
at java.base/java.util.concurrent.ConcurrentHashMap.merge(ConcurrentHashMap.java:2048)
at com.android.tools.r8.internal.CN.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:6)
at com.android.tools.r8.graph.B2$a.e(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:4)
at com.android.tools.r8.dex.b.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:105)
at com.android.tools.r8.dex.b.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:28)
at com.android.tools.r8.D8.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:25)
at com.android.tools.r8.D8.d(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:606)
at com.android.tools.r8.D8.c(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:1)
at com.android.tools.r8.internal.Bj.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:24)
... 5 more
Directory 'obj/Debug/lp/102' is from 'Xamarin.Grpc.Stub.dll'. (JAVA0000) (FirebaseTests.Android) java
The error refers to Xamarin.Google.Guava so I thought installing Xamarin.Google.Guava individually would solve the issue but not at all; I am still getting the same error.
Could someone please help me? There is no way I am the only person this is happening to.
You should file the bug, Xamarin.Firebase.Firestore needs to work when installed: https://github.com/xamarin/GooglePlayServicesComponents/issues/new
Aside from that you may try some older version and see if it works, e.g. version 123.0.3.7 seems to work well for me.
I've got this error in my Xamarin Forms project for all the packages installed in it:
Failed to download package 'Fody.6.5.1' from 'https://api.nuget.org/v3-flatcontainer/fody/6.5.1/fody.6.5.1.nupkg'.
The HTTP request to 'GET https://api.nuget.org/v3-flatcontainer/fody/6.5.1/fody.6.5.1.nupkg' has timed out after 100000ms.
I've cleaned the solution & restoring NuGet Package but I still have the same errors.
You can try to install older versions.May be related to the project.
You can manage to restart VS to get the package to reinstall.And just to confirm, make sure your internet connection active and stable at the time.Also,you can try to install other versions of Fody as Furkan mentioned.
I had a working app when suddenly I got this warning:
"Warning NU1605 Detected package downgrade: Microsoft.NETCore.UniversalWindowsPlatform from 6.2.9 to 6.1.9."
In trying to figure out what is going on, I found that a new project with no added code will get this error too.
I also found that I could open the .csproj file in Notepad and change the line from 6.1.9 to 6.2.9 but wonder why I have to do this or what else I should be doing.
"Warning NU1605 Detected package downgrade: Microsoft.NETCore.UniversalWindowsPlatform from 6.2.9 to 6.1.9."
From shared warnning log, you need to update Nuget Package (Microsoft.NETCore.UniversalWindowsPlatform) form 6.1.9 to 6.2.9.
About updating can follow bellow steps:
Click Tools-> Nuget Package Manager -> Manange Nuget Packages for Solution...
Then in Installed will see the nuget package there:
Select the neeed version to install:
I have a problem with the update Microsoft.NETCore.UniversalWindowsPlatform.
There was version 5.0.0, when you start the development environment, the management offered me a package to update components. All components are successfully updated, except that package. I just receive the message: "Failed to recovery package. Package rollback changes to ***." What to do with this problem, I do not know. Inet clambered, tried to remove the package and put again (by removing the package is not compromised with the same error).
For this error like the following screen shot, two suggestions:
(1)Tools > Options > Projects and Solutions > General, please checked "Save new projects when created" option.
(2)Install the latest packages:
Install-Package Microsoft.NETCore.UniversalWindowsPlatform
https://www.nuget.org/packages/Microsoft.NETCore.UniversalWindowsPlatform/5.2.2
I'm working with NopCommerce 2.60, and suddenly I'm getting this error when I run the project
NuGet Package restore failed for project Nop.Plugin.ExternalAuth.Facebook: Unable to find version '2.0.21' of package 'LinqToFacebook'..
I tried to restore the package by NuGet but got the same error and the wired thing is that I cannot find even the reference to LinqToFacebook in project "Reference", also search for the LinqToFacebook.dll in package folder but is not there.
Any help would be great
Best regards.
Find the package.config inside Facebook Plugin and remove or comment the reference to LinqToFacebook
that solved the error thwon by Visual Studio
I'm getting the same error, and I'm trying to upgrade version 2.65 of nopCommerce to version 2.7. We also have version 2.65 deployed on a public server, and I don't have any LinqToFacebook.dll in our bin folder. I can find no evidence of any LinqToFacebook NuGet package either, so I'm thinking that this .dll was once required by older versions of NopCommerce and is no longer available. My solution is to comment out the line in the package.config file and move on. Later versions of nopCommerce do not require this .dll.