Div-e-Sepid

fun AppCompatActivity.setAsActionBar(toolbar: Toolbar) {
    setSupportActionBar(toolbar)
    supportActionBar!!.setDisplayHomeAsUpEnabled(true)
    supportActionBar!!.setDisplayShowHomeEnabled(true)
    toolbar.setNavigationOnClickListener { onBackPressed() }
}

Div-e-Sepid

// passing layout file to AppCompatActivity constructor
class MainActivity : AppCompatActivity(R.layout.activity_main)

// passing layout file to AndroidX Fragment constructor
class MainFragment : Fragment(R.layout.fragment_main)

Div-e-Sepid

abstract class BaseActivity(
    @LayoutRes private val layoutRes: Int? = null
): AppCompatActivity(), InterfaceOne, InterfaceTwo {

    @Inject // now all my children have to use dagger, YAY!
    lateinit var analytics: Analytics

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)