I would like to make sure queried value from database comes always later than default value.

For example

class SetTimeFragment : Fragment(){

    private lateinit var binding: FragmentSetTimeBinding

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
        binding = FragmentSetTimeBinding.inflate(layoutInflater, container, false)

        val dbId = 3
        val defaultTime = LocalTime.now().toString()

        //Set default value
        binding.timeView.setText(defaultTime)


        lifecycleScope.launchWhenCreated {

            val itemList = withContext(Dispatchers.IO) {

                //This is Database query
                ObjectBox.store.boxFor(Data::class.java)[dbId]
            }

            // string from database e.g.12:30
            val newTime = itemList.dbTimeStr

            //overwrite default value with database query result
            binding.timeView.setText(newTime)
        }


        return binding.root
    }

} 

Currently, this code has no problem. But does coroutine possibly return value faster than default value? I mean, database value goes to view first, and default value overwrites it. If it possibly happens, how can I prevent it? Thank you.

CodePudding user response：

The coroutine doing the DB query is not even started when the default value is set on the text view, so there is no risk it can finish before that and write a value that would be overwritten by the default