Android ViewModel use LiveData as an Event bus

TheActivity.kt

class TheActivity : AppCompatActivity() {
  
  private val theSharedViewModel by viewModel<TheSharedViewModel>()
  
  override fun onCreate(savedInstanceState: Bundle?) {
    // bla bla bla
    theSharedViewModel.getEvent().observe(this, Observer {
      Log.i("TheSharedEvent", "Event Triggered")
    })
  }
}

TheFragment.kt

class CrewListFragment : Fragment() {
  
  // Note that the viewModel is by `sharedViewModel`, which is just a way of sharing it
  // See https://developer.android.com/topic/libraries/architecture/viewmodel#sharing
  private val theSharedViewModel: TheSharedViewModel by sharedViewModel()
  
  // This is called by something
  private fun someActionThatShouldTriggerTheEvent() = theSharedViewModel.triggerEvent()
  
}

TheSharedViewModel.kt

class TheSharedViewModel() : ViewModel() {
  
  // The event itself is a MutableLiveData of Unit (kotlin useless object which is very useful in fact)
  private var theEvent: MutableLiveData<Unit> = MutableLiveData()
  
  // Kind of a getter but casted as LiveData to prevent updates from outsite viewmodel
  fun getEvent(): LiveData<State> = crewState
  
  // Trigger the event update
  fun triggerEvent() {
    theEvent.postValue(Unit) 
  }
    
}

Note that I used koin as dif

Cool, was looking for something like this - thanks!