MainActivity findViewById

MainActivity.kt

class MainActivity : AppCompatActivity() {
    
    private var myTextView: TextView? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        
        myTextView = findViewById(R.id.txtView)
        
        // Agora podemos utilizar o txtView
        myTextView?.text = "vai algum texto aqui"
        myTextView?.setOnClickListener {  }
    }
}