Android kotlin lazy view injector

KotlinActivity

class KotlinActivity : Activity() {

    val btn: Button? by find(R.id.button)

    override fun onCreate(savedInstanceState: Bundle?) {
        super<Activity>.onCreate(savedInstanceState)
        setContentView(R.layout.main)
        btn?.setText("Hello from kotlin")
    }

    fun <T : View?>find(id: Int) = Delegates.lazy { findViewById(id) as T }
}