I am fetching currency exchange rate by api call using retrofit and ViewModel concept.On launch of application I am able to get the latest data from the server but when I am trying to update the live data by clicking the button, Live Data value is not updating, I am getting the same old data.So can anyone please help me out how to update live Data on button click event.

ViewModel Class*****

class MainViewModel(private val repository: CurrencyRepository) : ViewModel() {

init {
    viewModelScope.launch() {
        repository.getCurrencyExchangeList()
    }
}

val quotes: LiveData<CurrencyData>
    get() = repository.currencyLiveData

}

Repository Class*****

class CurrencyRepository(private val currencyService: CurrencyInterface) {

val currencyLiveData = MutableLiveData<CurrencyData>()


suspend fun getCurrencyExchangeList() {
    val result = currencyService.getAllCurrencyData()
    if (result.body() != null) {
        //currencyLiveData.postValue(result.body())
        currencyLiveData.value = result.body()
    }
}

}

Method(in MainActivity) to get and update currency list *****

private fun fetchCurrencyRates() {

    val currencyService = RetrofitHelper.getInstance().create(CurrencyInterface::class.java)
    val repository = CurrencyRepository(currencyService)
    val mainViewModel =
        ViewModelProvider(this, MainViewModelFactory(repository))[MainViewModel::class.java]
    mainViewModel.quotes.observe(this, Observer {
        Log.d("AllCurrencyList", it.updated)

    })

}