HomeActivity.kt

import org.koin.androidx.viewmodel.ext.android.viewModel
...

class HomeActivity: AppCompatActivity() {
    
    private val homeViewModel by viewModel<HomeViewModel>()
    
    override fun onCreate(..) {
        ...
        
        homeViewModel.getResultFromApi()
            .observe(this, Observer { result ->
                displayResult(result)
            })
    }
    
    private fun displayResult(result: Result<String>) {
        when(result) {
            Result.InProgress -> {
                progressbar.visibility = View.VISIBLE
            }
            is Result.Success -> { 
                progressbar.visibility = View.GONE
                succssTextView.visibility = View.VISIBLE
                succssTextView.text = result.data
            }
            is Result.Error -> {
                progressbar.visibility = View.GONE
                failureTextView.visibility = View.VISIBLE
                failureTextView.text = "Oops, there's some issue, try again later!"
            }
        }
    }
}