Targeting 64 bit architectures on Xamarin Android

Question

I received an email from Google that we need to start supporting 64-bit CPUs in our Android apps by August 1, 2019. In their documentation, it states that there should be a lib/arm64-v8a folder in your apk contents if you're correctly supporting 64 bit.

In my Xamarin Project Options > Build > Compiler settings, my Platform target is set to "Any" so I would expect it to build both 32 and 64 bit versions. However, when I generate a release build and package it into an apk, when I browse the apk it only has a lib/armeabi-v7a folder, there is no v8a folder. So what do I need to do to support 64 bit architectures?

EDIT: I should have included this screenshot, showing my Supported ABIs:

Answer 1

Go into your Project settings / Build / Android Build / Advanced and enable arm64-v8a as one of your supported ABIs.

And then do a fresh build (or a new archive if you are using that feature of VS).

Note: Make sure you do this for your Release configuration

Answer 2

As @sushihangover mentioned, you just have to Make Sure that on your "Release" configuration, you need to select the arm64-v8a ABI configuration. Remember to "Rebuild All" before you hit "Archive for Publishing" so that you don't run into issues based on cached data. You can view this article for more details and a video.