I want to pick a random number from contact list and show it as Text. Below is what I came up with but when I insert showNext() somewhere on main.dart as text, I get Closure: () => Future from Function 'showNext': static.() instead of a number. How do I show a number?
Future<void> showNext() async {
var status = await Permission.contacts.status;
if (status.isGranted) {
var contacts = await ContactsService.getContacts;
var list = contacts;
list.shuffle();
randomNum= (list.first.phones?.first.value ?? '');
Text('$randomNum');
Future<Widget> showNext() async {
var status = await Permission.contacts.status;
if (status.isGranted) {
final Iterable<Contact> contacts = (await ContactsService.getContacts(withThumbnails: false));
var list = contacts.toList();
list=list.shuffle();
randomNum= (list.first.phones?.first.value ?? '');
return Text('$randomNum');
}
when you want use:
FutureBuilder<String>(
future: showNext(),
builder: (context, snapShot) {
if (!snapShot.hasData) {
return Container();
}
return snapShot.data;
},
)
Related
I have created a group screen in my flutter app and when I hit the create button it create a group as described is code:
//Create group
Future<String> createGroup(String groupName1, userUid) async {
String retVal = "error";
List<String> members = [];
try {
members.add(userUid);
DocumentReference docRef;
docRef = await firestore.collection("groups").add({
'name': groupName1,
'leader': userUid,
'members': members,
'groupCreate': Timestamp.now(),
});
retVal = "success";
} catch (e) {
// ignore: avoid_print
print(e);
}
return retVal;
}
I am stuck in getting the snapshot from my FBbackend. I want to get the info and display is on my group screen. How can I achieve that?
I have try to get the snapshot but it says Text("..."). I think the problem is that the value of DocumentReference? docRef; is empty, but I don’t know how to fixed it.
code:
DocumentReference? docRef;
docRef == null
? const Text('Error No Group Name Found!!')
: // 👈 handle null here
StreamBuilder<DocumentSnapshot<Map<String, dynamic>>>(
stream: FirebaseFirestore.instance
.collection('groups')
.doc(docRef!.id)
.snapshots(),
builder: (context, snapshot) {
if (snapshot.data == null) {
return const ErrorScreen();
}
return Center(
child: Text((snapshot.data
as DocumentSnapshot<
Map<String, dynamic>>)['name']),
);
}),
I am trying to read the data from a list that has the data of Instance of '_JsonQuerySnapshot'.
In the below code I am trying to get the data from DB
getData() async {
var db = FirebaseFirestore.instance;
var categoryList = [];
db.collection('categories')
.doc(value)
.get()
.then((DocumentSnapshot doc) {
var listSubCol = doc["categoryCollection"];
listSubCol.forEach((id) {
db.collection('categories')
.doc(value)
.collection(id)
.get()
.then((snapshot) {
categoryList.add(snapshot);
return categoryList;
});
});
});
}
Below is the code where I am printing the values.
FutureBuilder(
future: getData(),
builder: (BuildContext context, snapshot){
if (snapshot.hasError) {
return Text("Something went wrong");
}
if (snapshot.connectionState == ConnectionState.done) {
print('Data: ${snapshot.data}');
return Text("Text");
}
return Text("Text Outside");
}
)
I got a null value.
Can anyone please help me with how to get the data?
The getData is a Future<void>, so when the FutureBuilder is completed the snapshot.data is always null.
Change getData to return a List of whatever you are getting.
Future<List<Categories>> getData() async {
var db = FirebaseFirestore.instance;
final List<Categories> categoryList = [];
await db.collection('categories')
.doc(value)
.get()
.then((DocumentSnapshot doc) {
var listSubCol = doc["categoryCollection"];
listSubCol.forEach((id) {
db.collection('categories')
.doc(value)
.collection(id)
.get()
.then((snapshot) {
categoryList.add(snapshot);
return categoryList;
});
});
});
return categoryList;
}
getData() async {
var db = FirebaseFirestore.instance;
await db.collection('categories').doc(value).get().then((DocumentSnapshot doc) {
var listSubCol = doc["categoryCollection"];
listSubCol.forEach((id) {
db.collection('categories').doc(value).collection(id).get().then((snapshot) {
snapshot.docs.forEach((element) {
categoryList.add(element.data());
});
});
return categoryList;
});
});
return categoryList;
}
using the above method i got the data from Firestore.
I have this future builder which loads a list of movies in my provider class. Whenever I reload my screen, the movies do not get returned. Below is the future builder
FutureBuilder(
future: movieData.getTrendingMovies(),
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.waiting) {
return const Center(
child: CircularProgressIndicator(),
);
} else if (snapshot.hasData) {
return Swiper(
itemBuilder: (BuildContext context, i) {
return ChangeNotifierProvider(
create: (context) => Movie(),
child: MovieContainer(
imageUrl: movieData.movies[i].imageUrl,
id: movieData.movies[i].id,
rate: movieData.movies[i].rate,
title: movieData.movies[i].title,
),
);
},
itemCount: movieData.movies.length,
viewportFraction: 0.25,
scale: 0.4,
);
} else {
return Text(snapshot.error.toString()); // it returns null on the screen
}
}),
Also in my homescreen where I display my movies, after the build method, I create a listener(moviesData) to listen to all changes in the movies provider.
final movieData = Provider.of<Movies>(context, listen: false);
Below is also the methos which fetches the movies from a restfulAPI using http get request
Future<void> getTrendingMovies() async {
List<String> movieTitles = [];
List<String> movieImageUrls = [];
List<String> movieDescriptions = [];
List<String> movieReleaseDates = [];
List<String> movieRates = [];
List<String> movieIds = [];
const _apiKey = '******************************';
const url =
'https://api.themoviedb.org/3/trending/all/week?api_key=$_apiKey';
try {
final response = await http.get(Uri.parse(url));
if (response.statusCode >= 400) {
print(response.statusCode);
return;
}
final extractedData = json.decode(response.body);
List moviesList = extractedData['results'] as List;
List<Movie> loadedMovies = [];
for (int i = 0; i < moviesList.length; i++) {
String movieTitle = moviesList[i]['original_title'] ?? '';
String? movieImage =
'https://image.tmdb.org/t/p/w400${moviesList[i]['poster_path']}'; //results[0].poster_path
String movieDescription =
moviesList[i]['overview'] ?? ''; //results[0].overview
String movieReleaseDate = moviesList[i]['release_date'] ?? '';
String? movieRate = moviesList[i]['vote_average'].toString();
String? movieId = moviesList[i]['id'].toString();
movieTitles.add(movieTitle);
movieImageUrls.add(movieImage);
movieDescriptions.add(movieDescription);
movieReleaseDates.add(movieReleaseDate);
movieRates.add(movieRate);
movieIds.add(movieId);
loadedMovies.add(
Movie(
id: movieIds[i],
title: movieTitles[i],
imageUrl: movieImageUrls[i],
description: movieDescriptions[i],
rate: double.parse(movieRates[i]),
releaseDate: movieReleaseDates[i],
),
);
}
_movies = loadedMovies;
notifyListeners();
//print(_movies.last.title); //This prints the name of the last movie perfectly....This gets called unlimited times whenever I set the listen of the **moviesData** to true
} catch (error) {
print(error);
}
}
There's a couple of things to unpack here.
Instead of a ChangeNotifierProvider, I believe you should use a Consumer widget that listens to your Movies provided service when you call the notifyListeners call, so make it Consumer<Movie>.
You can still call it using the Provider.of above for the sake of making the async call via the FutureBuilder, but I believe because you're not returning anything out of the getTrendingMovies and is just a Future<void> and you're querying the snapshot.hasData, well there is no data coming through the snapshot. Maybe instead you should call snapshot.connectionState == ConnectionState.done as opposed to querying for whether it has data.
Make sure that the response.body is truly returning a JSON value, but I believe your issue is in one of the points above.
What I need to do is I have a list of ids and I need to fetch data from firestore and ignore those id which are available on that data (Those data doc id is same which are in ids)
I am doing like this
getProfiles(BuildContext context) async {
var profileProvider = Provider.of<profilesProvider>(context, listen: false);
final userProviderState = Provider.of<userProvider>(context, listen: false);
final globalProviderState =
Provider.of<globalProvider>(context, listen: false);
showDialog(
context: context,
barrierDismissible: false,
builder: (BuildContext context) {
return spinkit;
});
CollectionReference _collectionRef =
FirebaseFirestore.instance.collection(USER_COLLECTION);
QuerySnapshot querySnapshot = await _collectionRef.get();
List allData = querySnapshot.docs.map((doc) => doc.data()).toList();
final likestate = Provider.of<LikeDislikeProvider>(context, listen: false);
for (var i = 0; i < likestate.likedislikePRofiles.length; i++) {
allData.removeWhere(
(item) => item['id'] == likestate.likedislikePRofiles[i].oppositeId);
}
allData.forEach((element) {
GeoPoint point = element['Location'];
if (calculateDistance(
userProviderState.user[0].Latitude,
userProviderState.user[0].Longitude,
point.latitude,
point.longitude)) {
profileProvider.addProfile(element);
} else {}
});
Navigator.pop(context);
}
But in this issue is I am getting all data then by for loop i am removing it which I don't think is good when data is too much. So what I want is from query I can ignore those data which doc id is same as in arrays.
Here is screenshot docid and id in data is same. I have list of doc id which needs to ignore.
I want to get List values as ints one by one.
where movieId requires an int value.
help me please
thank you
Future<MovieDetailModel> getMovieDetail(int? movieId) async {
try {
http.Response res = await http
.get(Uri.parse('$mainUrl/movie/$**movieId**?$apiKey&language=ko-KR'))
.timeout(Duration(seconds: 8),
onTimeout: () async => new http.Response('{}', 404));
if (res.statusCode == 404) {
return MovieDetailModel.fromJson({});
}
Map<String, dynamic> result = jsonDecode(res.body);
MovieDetailModel movies = MovieDetailModel.fromJson(result);
return movies;
} catch (e) {
print('MovieDetail $e');
}
return MovieDetailModel.fromJson({});
}
where user.userMovieId value is List .
Widget userMovie(UserModel user) {
return FutureBuilder(
future: this._movieDetailProvider.movies(**user.userMovieId!**),
builder:
(BuildContext context, AsyncSnapshot<MovieDetailModel> snapshot) {
if (snapshot.hasData) {}
Provider.
Future<MovieDetailModel> movies(int movieId) async {
MovieDetailModel movieList = await _movieRepo.getMovieDetail(movieId);
notifyListeners();
return movieList;
}