您可以方便地调用从本地code Java的活动是这样的：

You can easily call Java activity from native code like this:

var intent = new Intent().SetClassName(this,"com.myapp.java.JavaActivity");
StartActivity(intent);

当我从理解这篇文章您可以调用从Java本机code通过ACW，但我认为这是太困难了。

As I understood from this article you can invoke native code from Java via ACW, but I think that it's too difficult