ListActivity-onActivityResult.kt

class ListActivity: AppCompatActivity {
    
    private val REQUEST_FORM = 1
    onCreate(...){...}

    fun startFormActivity() {...}
  
    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        
        // check if the requestCode is the wanted one and if the result is what we are expecting
        if (requestCode == REQUEST_FORM && resultCode == RESULT_OK) { 
            val name = data?.getStringExtra(FormActivity.INPUT_NAME)
            addItemToList(name) // do something with the value
        }
    }
}