単純遷移

class MainActivity : AppCompatActivity() {

private lateinit var binding: ActivityMainBinding

private val nextButtonListener = View.OnClickListener {

val intent = Intent(this, SubActivity::class.java)

startActivity(intent)

}

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

binding = ActivityMainBinding.inflate(layoutInflater)

setContentView(binding.root)

binding.nextButton.setOnClickListener(nextButtonListener)

}

}