How to display a loading icon on every request in the api

user_2799824 0
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How to display a loading icon on every request in the API? On the first request it shows the progress icon but on the second request it's like it cached and didn't show the load.

My viewModel:

class CadastroViewModel:ViewModel() {
    private val cadastroRepository= CadastroRepository()

    private val _resultado: MutableStateFlow<MessageCad> = MutableStateFlow(MessageCad())
    val resultado: StateFlow<MessageCad>
        get() = _resultado


    fun create(nome: String,email: String,cpf:String,telefone:String,
               celular:String,senha:String,endereco:String,bairro:String,numero:String,
               complemento:String,cidade:String
    ){
        viewModelScope.launch {
            try {

               val r = cadastroRepository.createUser(nome,email,cpf,telefone,celular,senha,endereco,bairro,
                        numero,complemento,cidade)
                _resultado.value = r

            } catch (e:Exception) {
                Log.d("Service error",e.toString())
            }
        }
    }
}

My view model call :

val value: MessageCad by model.resultado.collectAsState(initial = MessageCad())
    
if(value.message.isEmpty()){
    CircularProgressIndicator(modifier = Modifier.wrapContentWidth(Alignment.CenterHorizontally))
}
android-jetpack-compose retrofit2 kotlin gson
1 Answers

The problem looks like value.message.isEmpty() never returning true after first call because model.resultado always have a result that is not empty.

You should either create a loading flag

private val _loading = MutableStateFlow(Boolean)
val loading: StateFlow<Boolean>
        get() = _loading

set it as

  viewModelScope.launch {
            try {
               _loading.value = true
               val r =  cadastroRepository.createUser(nome,email,cpf,telefone,celular,senha,endereco,bairro,
                        numero,complemento,cidade)
                _resultado.value = r

            }catch (e:Exception){
                Log.d("Service error",e.toString())
            }finally {
              _loading.value = false
            }

        }

or use ViewState approach to have Loading, Success or Error states to display for any possible state of your api call.

user_54578530
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