How to access fragments in MainActivity?

Question

Java

The application has three tabs. They are created from MainActivity using ViewPager and ViewPageAdapter. Each tab has a recyclerview. When clicking on the tab title, the specific recyclerview scrolls to the top. To do this, I want to put a listener for the menu in MainActivity.
How to access fragment elements from the main activity through findViewById?

Answer 1

In general, of course, you can do this, but it is not necessary. A fragment must completely encapsulate the behavior of everything it has inside. The activity doesn't need to know what's inside the fragment. A fragment should not know anything about other fragments.
The standard decision such - becomes the interface with the necessary methods. The fragment implements this interface. Activity pulls methods. Activity can also implement similar interfaces and the fragment can then pull these methods.