re call api in fragment android kotlin and perform searchView

the question is similar on Where should I call Rest API in fragment

but i want to discuss about the right on code.

i have call an api from oncreateView() for example

override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        GlobalScope.launch {
            showHomeViewModel("someState")
        }
}

in function showHomeViewModel() i have defined condition for adapter

private suspend fun showHomeViewModel(state: String) {
  withContext(Dispatchers.Main) {
    viewModel.liveData().observe(viewLifecycleOwner, observer)

    if(adapter.itemCount == 0) callApi() else Log.d(TAG_LOG, "nothing todo")
  }
}

so its calling if the data == 0

but i have searchView component , when i navigate to other fragment and back to first fragment , the observer is null...

    private val observer =
        Observer<MutableList<DataItem>> { item ->
            Log.d(TAG_LOG, "observer data $item") // always null if i have ever navigate to other fragment
            if (item != null)
                adapter.setData(item)
            binding.progress.gone()
        }

the problem is solve when i remove the condition adapter.itemCount == 0. but the lifecycle my device always call api when screen or fragment appear.

before i always put the callApi from onResume(), but in my course should i put to the onCreateView and other explain should in onViewCreate() but the main problem is , **its good the code if i use the condition adapter.itemCount == 0 ? to perform searachView , where i defined on viewModel for search (liveData) **

i was tried to from adapter Filterable to perform search but its not work with liveData, so i use my viewModel instead of filterable.