How to learn to understand the code of a complex application?

Question

Android

I know it's a stupid question, but still. I am new to Android development, I have been studying books and courses for about 3-4 months in parallel with the university. IT University but they don’t teach anything there, so I have to do it myself in my free time. So I've already read the books Head First: Java and Head First: Androidfor the basics. I watch courses from Google on Udacity, they explain it quite well in a couple of courses, more or less put things in order in my head. I like to study from books, although everyone writes that it is an outdated topic, but in books everything is structured and it is clear what is going on. But even after 4 months, I still cannot understand more complex code than in books, I look at open-sources on GitHub and go nuts. It's just that I'm wondering how to learn and understand all this, there's no such thing in books on YouTube either. I opened a simple application on GitHub there is so much code and I don't know where to find an explanation for all this code))!?

Answer 1

Ctrl+Q, Ctrl+B when you understand the code
And you also start writing your application. You look at how others have done and try to transfer to yourself.
And treat the open source code as schoolchildren's essays on a given topic.
Even examples from dev.android are not always ice.