MainActivity.kt

 private val viewModel by lazy { ViewModelProviders.of(this, EventsVMFactory(EventsImpl(EventsRepoImpl()))).get(EventsViewModel::class.java) }
  ...
  override fun onCreate() {
  viewModel.fetchEventList.observe(this, Observer {

            when(it){

                is Resource.Loading -> {
                   // Before try catch in viewmodel we can use emit(Resource.Loading()) to tell the view we started fetching results and this will be triggered
                }

                is Resource.Success -> {
                    // we get the list data with it.data 
                }

                is Resource.Failure-> {
                    //Handle the failure
                    Toast.makeText(this,"An error has ocurred:${it.throwable.message}",Toast.LENGTH_SHORT).show()
                }
            }


        })
        }