I am making an android app in xamarin studio and it needs to have google play services because of google maps api v2 and a QR code scanner for mobile. But when I added zxing.net.mobile to my packages after I had set up google maps and gotten the google play services package, they both fail as they are both dependent on the 'Xamarin.Android.Support.v4' package.
I have tried this on two different solutions and the same thing happens.
I have looked into this on google and stack overflow and found dependency hell on wikipedia, but I can not seem to apply that to NuGet packages when using Xamarin Studio. Dependency hell on wikipedia
And i found this reason for it: Question answer without full explanation on how to do this.
So how does this work, where do I look to change to only using Xamarin.Android.Support.V4 for both ZXing.net and google play services?
Error:
C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(2,2): Error: Exception while loading assemblies: System.IO.FileNotFoundException: Could not load assembly 'Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken='. Perhaps it doesn't exist in the Mono for Android profile?
File name: 'Xamarin.Android.Support.v4.dll'
at Xamarin.Android.Tuner.DirectoryAssemblyResolver.Resolve(AssemblyNameReference reference, ReaderParameters parameters)
at Xamarin.Android.Tasks.ResolveAssemblies.AddAssemblyReferences(ICollection`1 assemblies, AssemblyDefinition assembly, Boolean topLevel)
at Xamarin.Android.Tasks.ResolveAssemblies.Execute() (TrailMapplication)
Figured out what I had to do, and it solved that problem: I went to my project on my computer and looked into
C:\Users\Name\Documents\Projects\Solution\Project\bin\Debug
and deleted a Mono.Android.Services.v4.dll and added the Xamarin.Android.Services.v4.dll instead.
Had to Re-build the project though but then it worked.
Related
I've installed several packages in a Unity (2020) app I'm building. Namely: World Locking Tools, MRTK, PUN2. World Locking Tools provides some examples that are built with assemblies defining scripting symbols that any derived files I want to build would need access to. I'd like to create my own version of certain files from one of these examples. To do this and have access to the scripting symbols in one of those examples, I created an assembly reference to reference the assembly for that example code within World Locking Tools package installed in my project space. In so doing, I kept running into the common "...not found, are you missing an assembly reference" issue, which ultimately led me to creating assembly references for many of the assemblies provided by the various packages I needed to use (not just the particular example code I initially wanted to modify). Once my project finally built successfully in unity, I then tried to upload to a Hololens 2 headset in Visual Studio. This provided the error in the title of this post. Coincidentally, the app also appears to fail to start on the headset. Before I tried to alter my codebase with modified versions of files from that World Locking Tools example and with assembly references, the code would successfully build in Unity and successfully deploy to the Hololens 2 headset.
Does the behavior and missing .pdb error I describe mean that I'm missing assembly references for yet other packages even though Unity successfully builds the project?
This is my first foray into using assemblies so be please be gentle :)
For the .pdb message, that one is ignorable since will not have that symbol available. However, the app not starting is definitely likely due to a missing component or loading issue. When ran in debugger, may get a better idea on what is missing or from a debugger log in Unity.
I am trying to build Xamarin Android binding libraries for two different RFID hand held scanner SDKs (from two different companies), and then reference them in a Xamarin.Android project. So the end goal is to have one application that can run on Device A or Device B and depending on the device manufacturer it will use a different implementation of a "scanner" interface. If I try to reference both of the resulting dlls from the Xamarin.Android project, then I get the following error:
Program type already present: com.hsm.barcode.DecodeOptions
Looking in the jars using JD-GUI as suggested in the Microsoft Docs I can see the problem is that both of the jars have a com.hsm.barcode package:
What is the best way to workaround this issue?
Note that if I use only one of the dlls then I have no issues.
What I have tried:
Using a single Xamarin Android binding library project for both jars - this gave exactly the same result
Renaming all of the classes in the jar to eliminate duplicate class names like this: <attr path="/api/package[#name='com.hsm.barcode']/class[#name='DecodeOptions']" name="name">DecodeOptions2</attr>. When I do this, in reflector I can see that the class name has indeed changed, but I still get the build error when building the Xamarin.Android project
Renaming the namespace in one of the projects: <attr path="/api/package[#name='com.hsm.barcode']" name="name">com.hsm.barcode2</attr>. Again, I can see the updated namespace in reflector but still I get the same "Program type already present" error when building the Xamarin.Android project
Similarly I have tried removing both the namespace and the duplicate classes using remove-node but seen similar results
This leads me to believe that this isn't necessarily an issue with the binding process but rather a more Android related problem. I have found some similar Android questions where people mention that you can use exclude module in gradle to remove dependencies [1] [2], but a) there seems to be no concrete answer that this is the right approach in this case and b) as I have been able to find gradle is not a tool that is used as part of the Xamarin/Visual Studio process.
My final desperate attempt to get something working was to unzip one of the jar files, remove all the .class files that are causing issues, then rezip and use this in the Android binding library and then reference this dll in my Xamarin.Android project. This seems to work (the project builds and runs) but I'm not sure it is the correct/safest/most stable solution.
To summarize, the question is: if you have two jars with duplicated namespaces/packages and you want to use both of these Jars in a Xamarin.Android project how can you avoid the resulting Program type already present: com.hsm.barcode.DecodeOptions error message.
I'm getting this error trying to build a Xamarin.iOS project referencing a .NET Standard 2.0 library.
None of the MT2001 issues online seem to have this specific "Error while processing references" reason, so I'm at a loss as to how to diagnose this. I've tweaked and fiddled about as much as any one person can and stay sane, but I'm really in the dark.
Can anyone out there point me in a direction?
Adding -v -v -v -v to "Additional mtouch arguments" in the project iOS Build settings will help diagnose the issue. After that, you can search the build output for MT2001 and view the inner exceptions. Obviously, each project may differ as to what assembly causes the linker to fail. You may need to add, remove or fix your references based on the output.
For example, I was trying to use SignalR from AspNetCore 2.1, which has a dependency on System.Threading.Tasks.Extensions 4.5.1 in my project, which it seems Mono does not yet support. Mono does not provide its own version of the assembly yet, so when mtouch goes to link the assembly, it's unable to do so and throws an exception:
Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: 'System.Threading.Tasks.Extensions, Version=4.2.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
Removing all references to this assembly (and therefore the whole feauture in my case) allowed the build and linking to succeed.
I've found that I get this when using a Xamarin library that is dependent on System.Reactive 4.1.0. There's a bug in there associated with System.Threading.Tasks.Extensions, and since it is a library I'm writing, I had to roll back to System.Reactive 4.0.0.
For me the error is as follows.
one of the package is mentioned in package.config file but it was not available in packages. So i added the missing package from nuget and the app works fine
Using the google play games services and Admob plugin I cannot seem to get my back to build into an APK and I am receiving the following error message. Any help would be appreciated as I have removed some duplicate files but I am still failing to find why I cannot build my app.
I am using Unity Unity 5.6.1f1 (64-bit).
game services: https://github.com/playgameservices/play-games-plugin-for-unity Ads: https://github.com/unity-plugins/Firebase-Admob-Unity
CommandInvokationFailure: Unable to convert classes into dex format.
C:/Program Files/Java/jdk1.8.0_121\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir="C:/Users/Jack/AppData/Local/Android/sdk\tools" -Dfile.encoding=UTF8 -jar "C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar" -
stderr[
Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/google/android/gms/internal/zzbyb;
Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/google/android/gms/internal/zzbyc;
2 errors; aborting
]
Some Background
When Unity builds your project for Android, it invokes several tools from the Android SDK. As part of that process, it converts all of your native (Java) code for Android into a file format called DEX (Dalvik executable).
All of your Android plugins get built up into a single package using that tool. The problems start when a few plugins have the same compiled Java code (classes) in them. This will cause the DEX tool to fail with an error like the one you're seeing:
Uncaught translation error: java.lang.IllegalArgumentException:
already added: Lcom/google/android/gms/internal/zzbyb;
Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/google/android/gms/internal/zzbyc;
This means that classes with those names were already included in another library, and so they cannot be added again.
Possible Causes
As explained above, this error occurs when you have duplicate plugins in your project; this can happen in different scenarios, here are some examples:
The same plugin is included more than once, under different folders of the project.
The same plugin is included more than once with different versions.
A plugin contains other dependencies "embedded" inside it, but these dependencies are already included in the project in some form.
How To Fix
You should look up duplicate Android plugins in your project and eliminate them (keep only 1 copy). From the error message you posted, the issue here is related to Google play services libraries. You should look into that (libraries named play-services-xxxx.aar).
Paid Help (Shameless Plug)
I provide a professional service for fixing this exact kind of issue. In case you (or anyone else) are not able to resolve such an issue themselves, feel free to contact me and get it solved.
I was facing the same problem after add admob in my project, here are 2 possible solutions:
Go to the file >> build settings and change the option internal to gradle
Open libs folders separately of both Facebook SDK and Google Play services and delete the matching files
It would be something like (support v4)
Google ads 11.2 has errors. It reuses certain jar classes .
On its own, it isnot an issue
Once you add in another google class, ie firebase, your done for.
There is a fix though. Google put out firebase 4.2 and ads 11.4
I have asp.net 4 webforms website which references PortableLibrary project. In the website I serialize classes from PortableLibrary. When I deployed the project to webserver machine with IIS6 I'm getting following error:
Could not load file or assembly 'System.Xml, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e, Retargetable=Yes' or one of its dependencies. The given assembly name or codebase was invalid. (Exception from HRESULT: 0x80131047)
the portable library project references System.Xml (v4.0.31029).
When I tried to deploy clean project without references, just with simple serialization of string object, it worked fine.
A tried assemblybinding in web config but without success.
Why I'm getting this error? I have no idea from where comes the '2.0.5.0' version of system.xml.
answer from here: http://visualstudiogallery.msdn.microsoft.com/b0e0b5e9-e138-410b-ad10-00cb3caf4981
which worked for me
We'll have clearer docs around this when we release, however, you need to have Update for Microsoft .NET Framework (KB2468871)[1] installed on the web server. You will also need to remove the the binding redirect - this will actually have the reverse effect of disabling the feature. :) [1] http://www.microsoft.com/downloads/en/details.aspx?FamilyID=41bdce1f-3cb3-44bb-9b33-23a1b8c99ac3&displaylang=en