I had Stack Overflow app on my phone. When I got my new phone, Stack Overflow Android app wasn't transferred because it wasn't in Play Store. When I search "StackOverflow Android app" on Google, it returns this URL but it looks like it was unpublished from Play Store. I was able to find v1.0.4 APK in apkmirror.
iOS version is still there.
What happened to the Android app?