param(primitive) 付 遷移

class MainActivity : AppCompatActivity() {

companion object {

const val INPUT_TEXT_EXTRA = "inputTextExtra"

}

private lateinit var binding: ActivityMainBinding

private val nextButtonListener = View.OnClickListener {

val inputText = binding.editText.text.toString()

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

putExtra(INPUT_TEXT_EXTRA, inputText)

}

startActivity(intent)

}

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

binding = ActivityMainBinding.inflate(layoutInflater)

setContentView(binding.root)

binding.nextButton.setOnClickListener(nextButtonListener)

}

}

class SubActivity : AppCompatActivity() {

private lateinit var binding: ActivitySubBinding

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

binding = ActivitySubBinding.inflate(layoutInflater)

setContentView(binding.root)

val inputText = intent.getStringExtra(MainActivity.INPUT_TEXT_EXTRA) ?: return

binding.textView.text = inputText

}

}