I have FutureBuilder to fetch User profil from API and code to fetch user like this :
Future<List<UserModel>> getUserByUsername({@required String username}) async {
try {
final response =
await _client.get("$_baseUrl/getUserByUsername?username=$username");
final Map<String, dynamic> responseJson = json.decode(response.body);
if (responseJson["status"] == "ok") {
List userList = responseJson['data'];
final result = userList
.map<UserModel>((json) => UserModel.fromJson(json))
.toList();
return result;
} else {
throw CustomError(responseJson['message']);
}
} catch (e) {
return Future.error(e.toString());
}
}
If you can see in above GIF, My FutureBuilder are inside BottomNavigationBar. Every i change the screen/page from BottomNavigationBar and come back to my FutureBuilder is always refresh !
How can i fixed it to only once to refresh ?
class _HomeScreenState extends State<HomeScreen> {
@override
Widget build(BuildContext context) {
final username = Provider.of<SharedPreferencesFunction>(context).username;
return SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
CardTime(),
FutureBuilder(
future: userApi.getUserByUsername(username: username),
builder: (BuildContext context,
AsyncSnapshot<List<UserModel>> snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
if (snapshot.hasError) {
return Center(
child: Text(
snapshot.error.toString(),
),
);
} else {
final user = snapshot.data[0];
return CardProfil(
imageUrl: "${userApi.baseImageUrl}/${user.fotoUser}",
detailProfil: [
Text(
user.namaUser,
style: TextStyle(fontWeight: FontWeight.bold),
),
Text(user.idDevice),
],
);
}
} else {
return Center(
child: CircularProgressIndicator(),
);
}
},
),
],
),
);
}
}
import 'package:flutter/cupertino.dart';
import 'package:shared_preferences/shared_preferences.dart';
class SharedPreferencesFunction extends ChangeNotifier {
SharedPreferencesFunction() {
initialSharedPreferences();
getUsername();
}
String _username;
String get username => _username;
void initialSharedPreferences() {
getUsername();
}
Future updateUsername(String username) async {
SharedPreferences pref = await SharedPreferences.getInstance();
await pref.setString("username", username);
//! It's Important !!! After update / remove sharedpreferences , must called getUsername() to updated the value.
getUsername();
notifyListeners();
}
Future removeUsername() async {
SharedPreferences pref = await SharedPreferences.getInstance();
final result = await pref.remove("username");
//! It's Important !!! After update / remove sharedpreferences , must called getUsername() to updated the value.
getUsername();
print(result);
notifyListeners();
}
Future getUsername() async {
SharedPreferences pref = await SharedPreferences.getInstance();
final result = pref.getString("username");
_username = result;
notifyListeners();
}
}
final sharedpref = SharedPreferencesFunction();
Update Question
I already try Initialize FutureBuilder and use initState and didChangeDependencies . But new problem is , if i initialize inside initState my profil not rebuild because Provider listen=false. If i using didChangeDependencies my FutureBuilder still refresh every i change screen. Something wrong ?
Initialize the Future
during initState
or didChangeDependencies
instead.
class _HomeScreenState extends State<HomeScreen> {
Future<List<UserModel>> user;
@override
void initState() {
super.initState();
// must use listen false here
final username = Provider.of<SharedPreferencesFunction>(context, listen: false).username;
user = userApi.getUserByUsername(username: username);
}
@override
void didChangeDependencies() {
super.didChangeDependencies();
final username = Provider.of<SharedPreferencesFunction>(context).username;
user = userApi.getUserByUsername(username: username);
}
@override
Widget build(BuildContext context) {
return SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
FutureBuilder(
future: user,
builder: (context, snapshot) {
// ...
},
),
],
),
);
}
}
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