How to test an Android application so that it works correctly on different devices?

Question

Android

I want to learn how to develop Android applications and make it a source of income as a freelancer. There are many devices that differ both in characteristics and in some technical aspects, the question is: how do you test your applications so that they work correctly on different devices? I understand that you can’t have absolutely all android smartphones, but what if, for example, your user has an error on a specific device, but you don’t have one? In general, any details of how the creators of android applications solve the problem of compatibility of their developments are interesting.

Answer 1

Companies often have dozens of different devices they test on, but for those who can't and/or don't want to, there are similar services.