build.gradle（模块：应用）

android {
....
buildFeatures {
            viewBinding true
        }
}

MainActivity.kt

class MainActivity : AppCompatActivity() {

private var _binding: ActivityMainBinding? = null
    private val binding
        get() = _binding!!

override fun onCreate(savedInstanceState: Bundle?) { 
super.onCreate(savedInstanceState)
_binding = ActivityChartBinding.inflate(layoutInflater) 
setContentView(R.layout.activity_main) 
} 
fun topla(view: View){
binding.apply {
//in this part it is used to access the views in the layout part
       var sayi1 = editText.text.toStirng()
      }
  } 
}