I'm trying to build an app to fetch list of feed from server and display in Recyclerview. I am trying out basic implementation of LiveData like this.
I have set up an observer in my Fragment as follows:
viewModel = ViewModelProviders.of(getActivity()).get(SellViewModel.class);
viewModel.getSellItemList(19).observe(this, new Observer<List<LambdaSellRequestClass>>() {
@Override
public void onChanged(@Nullable List<LambdaSellRequestClass> sellItems) {
adapter.setSellEntities(sellItems);
}
});
My SellViewModel clas like this:
public class SellViewModel extends AndroidViewModel {
private SellRepository repository;
private MutableLiveData<List<LambdaSellRequestClass>> sellItems;
public SellViewModel(@NonNull Application application) {
super(application);
repository = new SellRepository(application);
try {
if (sellItems == null) {
sellItems = new MutableLiveData<>();
sellItems.postValue(repository.getSellItemList(user_id));
}
}catch (Exception e) {
Log.d("SELLFRAGMENT", "Error: " + e.getLocalizedMessage());
}
}
public MutableLiveData<List<LambdaSellRequestClass>> getSellItemList(int userId) throws ExecutionException, InterruptedException {
return sellItems;
}
}
My SellRepository like this:
public class SellRepository {
public SellRepository(Application application) {
}
public List<LambdaSellRequestClass> getSellItemList(int userId) throws ExecutionException, InterruptedException {
return new SellRepository.GetSellItemListAsync(SellRepository.this).execute(userId).get();
}
private static class GetSellItemListAsync extends AsyncTask<Integer, Void, List<LambdaSellRequestClass>> {
List<LambdaSellRequestClass> list = new ArrayList<>();
public GetSellItemListAsync() {
}
@Override
protected List<LambdaSellRequestClass> doInBackground(Integer... integers) {
final int userID = integers[0];
list =
lambdaFunctionsCalls.getSellItemByUser_lambda(requestClass).getSellItems();
return list;
}
}
My problem is when I add new sell items to database its not update mobile app.
