Build Your First Android App with Visual Studio 2019 and Xamarin

The Discussion

• 

  Need someone to test this Visual Studio 2019 Tutorial
  
  Does not work when I try it. it's only a 4 minute tutorial. I must be missing something.
  
  I will describe my environment. Windows 10 Pro. Visual Studio 2019 Community
  
  I chose the single page template.
  

• 

  I followed the tutorial exactly. Tried to run. Got this error message:
  
  1> No way to resolve conflict between "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" and "mscorlib, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e". Choosing "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" arbitrarily.
  
  Please resolve.

• 

  The title is not clear enough to state that this is with xamarin forms which approach is different from xamarin android.

• 

  Does not work.
  
  Just installed latest version of VS2019 (v16.1.5)
  Noted also that I got a different version of the nuget packages Xamarin.Essentials (1.1.0) and Xamarin.Forms (4.0.0.425677)
  
  Output when I build:
  1>------ Rebuild All started: Project: App1, Configuration: Debug Any CPU ------
  1>C:\Program Files\dotnet\sdk\3.0.100-preview5-011568\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.RuntimeIdentifierInference.targets(157,5): message NETSDK1057: You are using a preview version of .NET Core. See: https://aka.ms/dotnet-core-preview
  1>App1 -> C:\VisualStudio\App1\App1\App1\bin\Debug\netstandard2.0\App1.dll
  2>------ Rebuild All started: Project: App1.Android, Configuration: Debug Any CPU ------
  2> App1.Android -> C:\VisualStudio\App1\App1\App1.Android\bin\Debug\App1.Android.dll
  2> No way to resolve conflict between "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" and "mscorlib, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e". Choosing "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" arbitrarily.
  2>C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(2664,3): error MSB6006: "javac.exe" exited with code 3.
  ========== Rebuild All: 1 succeeded, 1 failed, 0 skipped ==========
  
  Tried updating nuget Xamarin.Forms to version (4.1.0.555618) with the same result.
  
  Tried searching the web for "javac exited with code 3" but found no luck.
  

• 

  I liked your video, but when I try to create the android emulator the Processor and OS are blank. Any suggestion? Thanks

• 

  I installed VS 2019 Ent and when I try to create an Android emulator I get the message:
  
  Could not start emulator
  
  Could not launch the emulator.
  Please file an issue by choosing "Report a Problem" in the Help menu, and attach your logs.
  Error message: "An attempt was made to load a program with an incorrect format."
  
  This makes it hard to create any mobile apps. Any insight to fixing this would be greatly appreciated. The video made it seem so simple with Xamarin.

• 

  My VS2019 experience is no where as good as this.
  Android Emulators fail to boot up, hang, (wait tem minutes, still not booting!) random and uninformative Android emulators.
  "starting Emulator", "Emulator xxxx cannot be started", "runtime checks completed", NuGet package restore cancelled" "build has ben cancelled"
  
  I do have Hyper V working OK, but Android development and Emulation is still a hit and miss affair on VS2019.
  
  Horrible

• 

  Microsoft u make learning Xamarin so hard. Visual Studio always error.

• 

  Reducing App File Size In Xamarin Forms is too large

• 

  Visual studio Xamarin form Android only project. Almost spend 10 hours. No Emulator show my hello world app. this is bad.

• 

  Check this link that says Visual Studio Emulator for Android is no longer supported since vs 2017
  
  https://docs.microsoft.com/en-us/visualstudio/cross-platform/visual-studio-emulator-for-android?view=vs-2017
  

• 

  I followed along and everything worked for me. However, I used my own phone in developer/USB debugging mode to test it. I have successfully used the emulator as well. I just need to know how to get it from VS to an apk.