ViewBinding

gradle

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

kt

class MainActivity : AppCompatActivity {
	private lateinit var binding: ActivityMainBinding

	override fun onCreate(saveInsttanceState: Bundle?) {
		super.onCreate(savedInstanceState)
		binding = ActivityMaiBinding.inflate(layoutInflater)
		setContentView(binding.root)
		binding.btnCurrent.setOnClickListener {
			binding.txtResult.text = Date().toString()
		}
	}
}