What methods can be used to organize data exchange between Fragments in an application?

Data exchange between Fragments in Android can be organized in several ways:

1. Through Activity — fragments communicate via the parent Activity. One fragment passes data to the Activity, and the Activity passes it to another fragment.

2. Using ViewModel with LiveData — a shared ViewModel associated with the Activity allows fragments to observe data changes and exchange data reactively.

3. Callback interfaces — a fragment defines an interface implemented by the Activity, which then passes data to another fragment through it.

4. Shared Preferences or database — a less preferred method, but data can be stored in a common storage.

5. EventBus (e.g., Otto, EventBus) — third-party libraries for event passing between components.

Example with ViewModel:

class SharedViewModel : ViewModel() {
    val selected = MutableLiveData<String>()
}

// In the first fragment
viewModel.selected.value = "Data to pass"

// In the second fragment
viewModel.selected.observe(viewLifecycleOwner) { data ->
    // Use the received data
}