Activity showing key points of View layer in MVP

MainActivity.kt

//Activity/Fragment/View implements interface
class MainActivity : AppCompatActivity(), MainView {
    // Initialize Presenter (also Model in the constructor of Presenter) & has object of Presenter
    private lateinit var mainPresenter: MainPresenter
    
    override fun onCreate(savedInstanceState: Bundle?) {
        //...
        mainPresenter = MainPresenter(this, MainInteractor())
        mainPresenter.getData()
    }
    
    //...
    
    override fun setData(arrUpdates: List<DataItem>) {
        // Show data on UI
    }

    override fun setDataError(strError: String) {
        // Show error on UI
    }

    override fun onDestroy() {
        // Destroy View
        mainPresenter.onDestroy()
        super.onDestroy()
    }
}

===================================

// Interface (acts as a contract between View and Presenter)
interface MainView {
    fun showProgress()
    fun hideProgress()
    fun setData(arrUpdates: List<DataItem>)
    fun setDataError(strError: String)
}