I got a new phone. Old phone has an app that isn't on google play antmore but I wanna still use it on my new phone. How can I save the app itself (not just the files) and install it on my new phone?

Thanks.

http://smartphones.reviewed.com/features/how-to-transfer-apps-data-new-smartphone-android-iphone-ios

This article mentions that it's possible to use the Android Back up Data feature to store your apps and then port them over to your new phone.

https://android.stackexchange.com/questions/47580/where-does-google-play-store-put-downloaded-apps/47581

This article is more pessimistic about porting over new apps. It basiscally says that if you wanted to use the .apk (or the source code that makes up an app) to install an app from an old device, it would be impossible unless you rooted the old phone. I don't know how tech savvy you are, but rooting your phone might void the warranty, which usually isn't a good thing.

That being said, you're probably going to be okay trying the first method.

And I'll report back

but it can be done

https://www.wikihow.tech/Extract-APK-File-of-Any-App-on-Your-Android-Phone

www.engadgethd.com - the other stuff i'm looking at