Why don't github sources work?

Question

Java

I wanted to learn from programs in github. I downloaded a lot of source codes, ran them in android studio and none of them run, while heaps of errors are highlighted. Why is this happening?
For example, these: https://apptractor.ru/info/articles/20-open-source...

Answer 1

This is all because in Android Studio - it does not know how to work with old versions of projects from the word "absolutely". There was an experience of maintaining one project - so after reinstalling Windows and downloading a new studio, I had to "try" to launch and assemble an absolutely working project on a new one.
Therefore, the scheme "downloaded, double-clicked, looked" is not suitable.
So if you take up the development, then delve into the details, analyze the logs, and not "nothing works on the github".
Github was created for those who are able to understand other people's sources.

Answer 2

Poked into the calendar project. Last commit 30 minutes ago. Branch only master. But the author marks the releases. So if it doesn’t work from the top, then take the release.