I have this function in my viewmodel and I want to retrieve a list of locations with a get Request.
But when I call the function fetchAllLocations from the fragment this function returns null. But in the onResponse method the list locations isn't null. I don't know why locations is null outside of the onResponse method.
fun fetchAllLocations(): List<Location>?
{
val call = apiInterface?.fetchAllLocation()
var locations: List<Location>? = null
call?.enqueue(object : Callback<List<Location>> {
override fun onResponse(call: Call<List<Location>>, response: Response<List<Location>>) {
locations = response.body()
}
override fun onFailure(call: Call<List<Location>>, t: Throwable) {
}
})
return locations
}
}
Add this live data in your viewmodel
val locationLiveData by lazy { MutableLiveData<<List<Location>>() }
fun fetchAllLocations(){
val call = apiInterface?.fetchAllLocation()
call?.enqueue(object : Callback<List<Location>> {
override fun onResponse(call: Call<List<Location>>, response: Response<List<Location>>) {
locations = response.body()
locationLiveData.postValue(locations)
}
override fun onFailure(call: Call<List<Location>>, t: Throwable) {}
})
}
}
Observe this live-data from your fragment class.
viewModel.locationLiveData.observe(viewLifecycleOwner, Observer {
//here you will get list
})
Ref Project : https://github.com/droiddevgeeks/MovieSearch ( Java) https://github.com/droiddevgeeks/TrendingRepo ( Kotlin)