[Xamarin]-resolution of "generatejavastubs" exception

Background

The new Xamarin project failed to compile.

Error The "Generatejavastubs" task failed unexpectedly.
Error The specified path, file name, or both is too long. The fully qualified file name must is less than 260 characters, and the directory name must is less than 248 characters. Demo_xamarin_helloworld.android

Reason

The default project path, under C:\Users\Administrator\Documents\Visual Studio 2017\projects\, exceeds the long path limit for Windows systems (MAX_PATH is 260 characters).

Solve

Update the project to a short path.

Resources

https://stackoverflow.com/a/37401496

[Xamarin]-resolution of "generatejavastubs" exception