GoodViewModel.kt

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val model: MainViewModel by viewModels()
      
        model.displayText.observe(this, Observer { text ->
            text_view.text = text
        })
    }
}

class MainViewModel(
    private val repo: Repository
) : ViewModel() {

    private val _displayText = MutableLiveData<String>()
    val displayText: LiveData<String>
        get() = _displayText
  
    init {
      loadTextFromNetwork()
    }

    private fun loadTextFromNetwork() = loadTextFromNetwork()

    private fun loadTextFromNetwork() {
        viewModelScope.launch {
            try {
                val response = repo.expensiveNetworkCall()
                _displayText.postValue(response.text)
            } catch (e: Exception) {
                // error handling
            }
        }
    }
}