How is information transferred between Fragment components in Android?

In Android, data transfer between fragments usually occurs through the activity that contains them or using shared ViewModel.

Main methods:

1. Via activity:

   • Fragment A calls a method of the activity and passes data.
   • The activity passes data to Fragment B.

2. Using interfaces:

   • Fragment A declares an interface for data transfer.
   • The activity implements this interface and receives data from Fragment A, then passes it to Fragment B.

3. Shared ViewModel (using architecture components):

   • Both fragments use the same ViewModel associated with the activity.
   • The ViewModel contains LiveData through which fragments exchange data.

Example with Shared ViewModel:

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

// In Fragment A
viewModel.selectedItem.value = "Data to transfer"

// In Fragment B
viewModel.selectedItem.observe(viewLifecycleOwner) { data ->
    // Use the received data
}