Retrieving Declared Views

Write in the input field the number of the line which would throw an error or -1 if an error isn't thrown.

override fun onCreate(savedInstanceState: Bundle?) {  //1
        super.onCreate(savedInstanceState)  //2

        val firstView: View = findViewById(R.id.firstViewId)  //3

        setContentView(R.layout.activity_name)  //4

        val secondView: View? = findViewById(R.id.secondViewId)  // 5

        val thirdView = findViewById<TextView>(R.id.thirdViewId)  // 6
        ...
}