Methods for checking internet connection?

Question

Android

What is the name of the topic that describes the problem of poor internet or reconnection? I'm wondering what to do if the Internet is bad or it suddenly disappeared and then reappeared, or something else, and the data selected must be sent or received on the subsequent connection to the Internet, I googled and found a solution, but this is a solution to a local problem , but I want to find the very topic of how to solve such problems. Or maybe there is a template that solves all the problems with the Internet at once, which is implemented the same way everywhere?