How to organize a call to frequently used functions in android?

Question

Android

I am writing an application for android - the question arose of how to reuse a set of my functions? For example, make a singleton static and call it from all activities or services? I started reading about DI, but I didn’t immediately understand how it works.
Maybe there is a standard solution?

Answer 1

Yes, just like in regular Java, singletons work. Only a singleton is evil and an anti-pattern. Don't store views, context, and so on in a singleton.
And there would be more examples of such necessary functions.