BelyakovLeonid

applyButton.setOnClickListener {
   setFragmentResult(
      "request_key",
       bundleOf("extra_key" to getSelectedSort())
   )
}

BelyakovLeonid

override fun onCreate(savedInstanceState: Bundle?) {
   super.onCreate(savedInstanceState)
   setFragmentResultListener("request_key") { key, bundle ->
        val selectedSort = bundle.getParcelable<Sort>("extra_key")
        // applying the obtained sorting 
   }
}

BelyakovLeonid

class NewActivity : AppCompatActivity(R.layout.a_main) {

   val permission = registerForActivityResult(RequestPermission()) { granted ->
       when {
           granted -> {
               camera.launch() // access to the camera is allowed, open the camera
           }
           !shouldShowRequestPermissionRationale(Manifest.permission.CAMERA) -> {
               // access to the camera is denied, the user has checked the Don't ask again.
           }

BelyakovLeonid

class PermissionsActivity : AppCompatActivity(R.layout.a_main) {

   val singlePermission = registerForActivityResult(RequestPermission()) { granted ->
       when {
           granted -> {
               // access to the camera is allowed, open the camera
           }
           !shouldShowRequestPermissionRationale(Manifest.permission.CAMERA) -> {
               // access to the camera is denied, the user has checked the Don't ask again.
           }

BelyakovLeonid

vButton.setOnClickListener {
   activityLauncher.launch("What is the answer?")
}

BelyakovLeonid

val activityLauncher = registerForActivityResult(MySecondActivityContract()) { result ->
   // using result
}

BelyakovLeonid

class MySecondActivityContract : ActivityResultContract<String, Int?>() {

   override fun createIntent(context: Context, input: String?): Intent {
       return Intent(context, SecondActivity::class.java)
           .putExtra("my_input_key", input)
   }

   override fun parseResult(resultCode: Int, intent: Intent?): Int? = when {
       resultCode != Activity.RESULT_OK -> null
       else -> intent?.getIntExtra("my_result_key", 42)

BelyakovLeonid

implementation 'androidx.activity:activity-ktx:1.3.0-alpha04'
implementation 'androidx.fragment:fragment-ktx:1.3.1'

BelyakovLeonid

class OldActivity : AppCompatActivity(R.layout.a_main) {

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

       vButtonCamera.setOnClickListener {
           when {
               checkSelfPermission(Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED -> {
                   // access to the camera is allowed, open the camera
                   startActivityForResult(