Automatic update of applications not from Google Play. How?

Question

Android

Hello dear habrchane.
There was such a problem, there was an urgent need to update the application not from Google Play.
Somehow, after reading this article and installing the application described there, I found that at one point the application offered me an update, and after I clicked on the notification, it updated itself.
Please tell me, kind people, how to implement a similar update system in your application.
I’ll make a reservation, the application is not mine, it was only handed over to me for revision, and I don’t know the reasons why it’s not in the market, but the need for automatic updates is acute!
Thank you all in advance for your response!

Answer 1

Well theoretically it should be quite possible. We need a self-written update server, which, when a new version appears, sends a push to the device. The device, in turn, downloads a new apk file, and then we work according to this method android.amberfog.com/?p=98 . It seems like it should be.

Answer 2

I did it as described here (the need for a version update was checked at startup), it worked
stackoverflow.com/questions/4967669/android-install-apk-programmatically