Hello,
Welcome to our Microsoft Q&A platform!
To work with JNI and Xamarin.Android, please check the following tutorial. This document illustrates how to use JNI to interact with Java types and members from Xamarin.Android applications.
https://learn.microsoft.com/en-us/xamarin/android/platform/java-integration/working-with-jni
Best Regards,
Jarvan Zhang
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