I have this function here it gets data from API and stores the data locally and I want to display a percent value like 20% ..... 100% in the splash screen while this function is being executed how can I do that?
_getCleaningDate(
{required AppGetCleaningDateEvent event,
required Emitter<AppState> emit}) async {
userDataModel = await SQLService.getUserData();
if (userDataModel == null) {
print('No User Data');
}
if (userDataModel != null) {
try {
emit(AppGetCleaningDateLoadingState());
propertiesModel = null;
offlineProperties = null;
bool hasNetwork = await Services.hasNetwork();
this.hasNetwork = hasNetwork;
if (hasNetwork) {
propertiesModel = await Services.getCleaningDate(
token: userDataModel!.token!,
cleanday: AvadaTheme.formateCleaningDate(event.dateTime));
await _syncAllData(event: AppSyncAllDataEvent(), emit: emit);
offlineProperties = await SQLService.getProperties(
AvadaTheme.formateCleaningDateFromStored(event.dateTime));
emit(AppGetCleaningDateSuccessState());
} else {
offlineProperties = await SQLService.getProperties(
AvadaTheme.formateCleaningDateFromStored(event.dateTime));
emit(AppGetCleaningDateSuccessState());
}
} on DioError catch (error) {
emit(AppGetCleaningDateErrorState(error.message));
}
}
}
Related
am learning api integration with bloc, these exception is been thrown when data is trying to fetch, for loadingstate i assigned a progressindicator then after that state when trying to get data,these exeption is been thrown ,pls helpenter image description here
as per the console i tried to change the data type to from double to num, still same exception
try {
_emitters.add(emitter);
await handler(event as E, emitter);
} catch (error, stackTrace) {
onError(error, stackTrace);
rethrow;
} finally {
onDone();
}
networkfile.dart
class Repository {
List<FakeStore> collections = [];
Future<List<FakeStore>?> getdata() async {
String url = 'https://fakestoreapi.com/products';
final data = await http.Client().get(Uri.parse(url));
if (data.statusCode != 200) {
return null;
} else {
Iterable values = jsonDecode(data.body);
for (var value in values) {
FakeStore fakeStore = FakeStore.fromJson(value);
collections.add(fakeStore);
}
return collections;
}
}
}
bloc.dart
class FakestoreBloc extends Bloc<FakestoreEvent, FakestoreState> {
final Repository repository;
FakestoreBloc({required this.repository}) : super(FakestoreInitialstate()) {
on<FakestoreEvent>((event, emit) async {
if (event is StorelaodEvent) {
emit(Fakestorelaodingstate());
List<FakeStore>? apiresult = await repository.getdata();
if (apiresult == null) {
emit(FAkestoreErrorstate());
} else {
emit(Fakestoreloadedstate(apiresult: apiresult));
}
}
});
}
}
I have a simple flutter code to retrieve some data from Firestore. the data is retireved correctly, however passing the data from the future function making the result always null. can you advise how to adapt the code to return the list?
that is the class where the actual query is happening:
class DatabaseManager {
final CollectionReference BusinessProfilesCollection =
FirebaseFirestore.instance.collection("BusinessProfilesCollection");
Future GetBusinessProfilesCollection() async {
List businessprofileslist = [];
try {
await BusinessProfilesCollection.get().then((QuerySnapshot) {
QuerySnapshot.docs.forEach((element) {
businessprofileslist.add(element.data());
print(businessprofileslist[0]);
});
});
} catch (e) {
print(e.toString());
return null;
}
}
}
here is the page where I am calling the function: (however the result is always null)
class _ProfilesListPageState extends State<ProfilesListPage> {
List businessprofileslist = [];
#override
void initState() {
super.initState();
fetchBusinessProfilesList();
}
fetchBusinessProfilesList() async {
dynamic result = await DatabaseManager().GetBusinessProfilesCollection();
print(result.toString());
if (result == null) {
print('enable to retieve');
} else {
print('success');
setState(() {
businessprofileslist = result;
});
}
}
#override
Widget build(BuildContext context) {
return Scaffold();
}
}
You're not returning anything from GetBusinessProfilesCollection but null, so the result seems somewhat expected.
I guess you want to do:
class DatabaseManager {
final CollectionReference BusinessProfilesCollection =
FirebaseFirestore.instance.collection("BusinessProfilesCollection");
Future GetBusinessProfilesCollection() async {
List businessprofileslist = [];
try {
var QuerySnapshot = await BusinessProfilesCollection.get();
querySnapshot.docs.forEach((element) {
businessprofileslist.add(element.data());
});
return businessprofileslist;
} catch (e) {
print(e.toString());
return null;
}
}
}
Btw: returning null when the load fails, is just going to lead to a null pointer exception when you then do print(result.toString());. So I recommend not catching the error and just letting it bubble up. With that your code can be simplified to:
class DatabaseManager {
final CollectionReference BusinessProfilesCollection =
FirebaseFirestore.instance.collection("BusinessProfilesCollection");
Future GetBusinessProfilesCollection() async {
var QuerySnapshot = await BusinessProfilesCollection.get();
return querySnapshot.docs.map((element) => element.data());
}
}
You just need to return the list
return businessprofileslist;
CODE :
class DatabaseManager {
final CollectionReference BusinessProfilesCollection =
FirebaseFirestore.instance.collection("BusinessProfilesCollection");
Future GetBusinessProfilesCollection() async {
List businessprofileslist = [];
try {
await BusinessProfilesCollection.get().then((QuerySnapshot) {
QuerySnapshot.docs.forEach((element) {
businessprofileslist.add(element.data());
print(businessprofileslist[0]);
});
// you just need to return the list here after filling it up
return businessprofileslist;
});
} catch (e) {
print(e.toString());
return null;
}
}
}
Code with a little improvement:
class DatabaseManager {
final CollectionReference BusinessProfilesCollection =
FirebaseFirestore.instance.collection("BusinessProfilesCollection");
Future GetBusinessProfilesCollection() async {
await BusinessProfilesCollection.get().then((QuerySnapshot) {
QuerySnapshot.docs.map((doc) => doc.data()).toList();
});
}
}
Try that with calling the function in feching
fetchBusinessProfilesList()
async {
dynamic result ;
await DatabaseManager().GetBusinessProfilesCollection().then((value){
result=value;
print(result.toString());
if (result == null) {
print('enable to retieve');
} else {
print('success');
setState(() {
businessprofileslist = result;
});
}
});
}
I working on error handling of api's. i want if api is crashed then it display a message of "Server is down" something like this, in UI.
I created a class where i'm creating methods of api, here in getBooks method if i modify the api url then it is printing this Exception, and i want it in UI. The problem is getBooks return type is List<Book>> so we can't return this Exception, any solution how to do this?
Exception
E/flutter (12924): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: Exception
here is my api code
class BooksApi {
static Future<List<Book>> getBooks(String query) async {
try {
final url = Uri.parse(
'https://gist.githubusercontent.com/JohannesMilke/d53fbbe9a1b7e7ca2645db13b995dc6f/raw/eace0e20f86cdde3352b2d92f699b6e9dedd8c70/books.json');
final response = await http.get(url);
if (response.statusCode == 200) {
final List books = json.decode(response.body);
return books.map((json) => Book.fromJson(json)).where((book) {
final titleLower = book.title.toLowerCase();
final authorLower = book.author.toLowerCase();
final searchLower = query.toLowerCase();
return titleLower.contains(searchLower) ||
authorLower.contains(searchLower);
}).toList();
} else {
throw Exception;
}
} catch (e) {
print("e");
print(e);
}
throw Exception;
}
}
and calling it like
Future init() async {
setState(() {
isLoading = true;
});
var books = await BooksApi.getBooks(query); //this
var response = await obj.getProduct();
print(response);
setState(() => this.books = books);
setState(() {
isLoading = false;
});
}
You could handle errors with then and onError :
await BooksApi.getBooks(query).then((books) async {
setState(() => {
this.books = books;
this.isLoading = false;
})
}, onError: (error) {
// do something with error
});
or a simple try-catch (you can write try-catch clauses the same way you would in synchronous code).
See handling errors.
You can also use catchError id you don't use async/await :
BooksApi.getBooks(query).then((books) {
setState(() => {
this.books = books;
this.isLoading = false;
})
}).catchError((error, stackTrace) {
print("error is: $error");
});
See futures error handling.
Try to wrap 'var books = await BooksApi.getBooks(query)' with try and catch.
...
try {
var books = await BooksApi.getBooks(query);
} catch (e) {
// To do for UI
}
...
For api, you need to make something like this:
APIModel{
final int code;
// or a success flag
// final bool success;
final String message;
final List<Book> data;
APIModel({this.code,this.message,this.data});
}
It means, every api have its own code,message,and data filed.
When you request, you can check your code or success:
var response = await request(params);
isLoading = false;
if(response.code == 0){}
// or
if(response.success){
// do what you want
}
else {
Toast.show(response.message);
}
You can use build_runner and json_serializable.
I have been trying to get a specific field from a specific document. I need token for toWho. But I always got null. How do I fix this?
Main Code is
Future<String> getUserToken(String toWho) async {
DocumentSnapshot _doc = await FirebaseFirestore.instance.doc("tokens/" + toWho).get();
if (_doc != null) {
Map<String, dynamic> _data = _doc.data();
return _data["token"];
} else {
return null;
}
}
in Repository
Future<bool> sendMessage(
MessageModel sendingMessage, UserModel currentUser) async {
if (appMode == AppMode.DEBUG) {
return true;
} else {
var _writePrcs = await _firestoreDBService.saveMessage(sendingMessage);
if (_writePrcs) {
var _token = "";
if (_userToken.containsKey(sendingMessage.toWho)) {
_token = _userToken[sendingMessage.toWho];
print("Token lokalden geldi.");
} else {
_token = await _firestoreDBService.getUserToken(sendingMessage.toWho);
_userToken[sendingMessage.toWho] = _token;
print("Token veritabanından geldi.");
}
Thanks for your help from now on
Try ...........
Future<String> getUserToken(String toWho) async {
DocumentSnapshot _doc = await
FirebaseFirestore.instance.collection("tokens/groupChatId/message").doc(toWho).get();
if (_doc != null) {
Map<String, dynamic> _data = _doc.data();
return _data["token"];
} else {
return null;
}
}
In my Flutter app, I have a function returning Future, but I wanna get result as Stream. Here is the function :
Future<bool> isGpsOn() async {
if (await Geolocator().isLocationServiceEnabled()) {
return true;
} else {
return false;
}
}
How to do that?
Read the manual and check my answer:
Stream<bool> gpsStatusStream() async* {
bool enabled;
while (true) {
try {
bool isEnabled = await Geolocator().isLocationServiceEnabled();
if (enabled != isEnabled) {
enabled = isEnabled;
yield enabled;
}
}
catch (error) {}
await Future.delayed(Duration(seconds: 5));
}
}
gpsStatusStream().listen((enabled) {
print(enabled ? 'enabled' : 'disabled');
});
or create convertor:
Stream futureToStream(fn, defaultValue, Duration duration) async* {
var result;
while (true) {
try {
result = await fn();
}
catch (error) {
result = defaultValue;
}
finally {
yield result;
}
await Future.delayed(duration);
}
}
Future<bool> isGpsOn() async {
return await Geolocator().isLocationServiceEnabled();
}
final gpsStatusStream = futureToStream(isGpsOn, false, Duration(seconds: 5));
gpsStatusStream.listen((enabled) {
print(enabled ? 'enabled' : 'disabled');
});
If you don't want to change the return type of your function, you could make callers convert the Future<T> to a Stream<T> by simply calling asStream() on the returned Future.