What are the current Android app design patterns?

Question

Android

What are the CURRENT architecture design patterns for Android development? I read and googled a lot on this topic and found a large number of articles, but all of them are not newer than 2012. Something tells me that since that moment the Android system itself has undergone some changes that negate some patterns. From the whole list, I saw that Singleton is often used to work with the database. Actually the subject, explain the situation or give a link to an explanatory description of this topic

Answer 1

Here is some good material: https://drive.google.com/drive/u/1/folders/0B0Z-lY...

Answer 2

after Update trigger