Get Collect ready for the Play Store 64-bit requirement

[yanokwa]

According to https://android-developers.googleblog.com/2019/01/get-your-apps-ready-for-64-bit.html

Starting August 1, 2019:

• All new apps and app updates that include native code are required to provide 64-bit versions in addition to 32-bit versions when publishing to Google Play.
• Extension: Google Play will continue to accept 32-bit only updates to existing games that use Unity 5.6 or older until August 2021.

Starting August 1, 2021:

• Google Play will stop serving apps without 64-bit versions on 64-bit capable devices, meaning they will no longer be available in the Play Store on those devices.
• This will include games built with Unity 5.6 or older.

https://developer.android.com/distribute/best-practices/develop/64-bit has guidance on the steps we can take today in order to ensure that your 32-bit app is ready to support 64-bit devices.

[grzesiek2010]

Looks as if it doesn't concern us. We don't use any native code so as they said in the doc:
If you can not find any '.so' files in your app at all, then your app is already ready and no further action is required

[yanokwa]

Thanks for looking into this. I've confirmed your findings by unzipping the apk, and running find . -iname "*.so".

[yanokwa]

We now have native code in Collect, so this issue is now relevant.

#3097 (comment)

[yanokwa]

I think with with the stub approach at #3108 we don't have to make this change until August 2021. Do you agree, @seadowg?

[seadowg]

I'm a little worried about #3144 for this one but I'm a bit out of context on the Mapbox work however so I might be missing something here!

It looks like Mapbox has problems initializing on 64 bit devices as it wasn't falling back to the 32 bit binaries (due to System.load being called - https://stackoverflow.com/questions/27186243/use-32-bit-jni-libraries-on-64-bit-android). Are we OK with Mapbox not working on 64 bit devices?

[yanokwa]

Ugh. Forgot about #3144. Yeah, we want Mapbox to work on 64 bit devices. I'll send in a quick PR.