Development environment is VS2019 now, according to the post method, go to step 17 is right,
https://blog.csdn.net/qq_31403321/article/details/79489078,

Now with this post, I now have Xamarin forms, the content of the reference method has completed the corresponding construction,
SDKInitializer. The Initialize (ApplicationContext);
When the program execution of the code above, can appear error:
Java. Lang. NullPointerException: 'Attempt to invoke virtual method' Java Lang. String. Android OS. The Bundle. Get String (Java. Lang. String) 'on a null object reference', specific what reason be? Please teach warrior!