The World smallest Dagger2 sample usage - https://medium.com/@elye.project/dagger-2-for-dummies-in-kotlin-with-one-page-simple-code-project-618a5f9f2fe8

somefile.kt

class MainActivity : AppCompatActivity() {

    @Inject lateinit var info: Info

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        DaggerMagicBox.create().poke(this)
        text_view.text = info.text
    }
}

class Info @Inject constructor() {
    val text = "Hello Dagger 2"
}

@Component
interface MagicBox {
    fun poke(app: MainActivity)
}