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Flutter - How to get value from shared preferences in a non-async method

Flutter: Access Stored Sharedpreference value from Other PagesHow to properly wait until future is complete in dartHow return Future from Future? Or this is prohibited in async library?Can i use the (facebook) parse library with google DART?Flutter: Best Practices of Calling Async Codes from UIUsing Futures to load config.json in FlutterHow to use Shared Preference in FlutterSharedPreferences.getInstance() before class constructorFlutter: Futures and shared preferencesFlutter: testing shared preferencesFlutter: shared preferenceshow to call dart package method from Flutter app

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0

1

I am trying to get some values saved in the SharedPreferences from a getter method of a class. But SharedPreferences.getInstance() returns a Future. Is there a way to obtain the SharedPreferences object in a non-async getter methods, for example:

import 'package:shared_preferences/shared_preferences.dart';

class MyClass 
 get someValue 
 return _sharedPreferencesObject.getString("someKey");
 

Is there something in Dart that is similar to .Result property in C#, for example getSomethingAsync().Result (https://docs.microsoft.com/en-us/dotnet/api/system.threading.tasks.task-1.result?view=netframework-4.7.2)?

dart flutter

share|improve this question

edited Mar 29 at 10:30

Dean

asked Mar 28 at 15:59

DeanDean

18211 gold badge44 silver badges1818 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Use a FutureBuilder stackoverflow.com/questions/54634418/…
  
  – Mazin Ibrahim
  Mar 28 at 16:05
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of Flutter: Access Stored Sharedpreference value from Other Pages
  
  – Richard Heap
  Mar 28 at 16:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi @CopsOnRoad, I knew those solutions but my question is more about whether there's a way to wait for future object to return in a non-async method. I edited my question to make it a bit clearer (I hope).
  
  – Dean
  Mar 29 at 10:32
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Dean, I am not aware of your use case, but the good thing would be to get the SharedPreferences on app startup and after this use it when you need. You can also instantiate it in Splash screen of your app.
  
  – CopsOnRoad
  Mar 29 at 11:18
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @CopsOnRoad, that's what I am doing at the moment. The answer to my question would be 'it's not possible'.
  
  – Dean
  Mar 29 at 12:14
  

  
  
  
  

add a comment
 | 

0

1

I am trying to get some values saved in the SharedPreferences from a getter method of a class. But SharedPreferences.getInstance() returns a Future. Is there a way to obtain the SharedPreferences object in a non-async getter methods, for example:

import 'package:shared_preferences/shared_preferences.dart';

class MyClass 
 get someValue 
 return _sharedPreferencesObject.getString("someKey");
 

Is there something in Dart that is similar to .Result property in C#, for example getSomethingAsync().Result (https://docs.microsoft.com/en-us/dotnet/api/system.threading.tasks.task-1.result?view=netframework-4.7.2)?

dart flutter

share|improve this question

edited Mar 29 at 10:30

Dean

asked Mar 28 at 15:59

DeanDean

18211 gold badge44 silver badges1818 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Use a FutureBuilder stackoverflow.com/questions/54634418/…
  
  – Mazin Ibrahim
  Mar 28 at 16:05
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of Flutter: Access Stored Sharedpreference value from Other Pages
  
  – Richard Heap
  Mar 28 at 16:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi @CopsOnRoad, I knew those solutions but my question is more about whether there's a way to wait for future object to return in a non-async method. I edited my question to make it a bit clearer (I hope).
  
  – Dean
  Mar 29 at 10:32
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Dean, I am not aware of your use case, but the good thing would be to get the SharedPreferences on app startup and after this use it when you need. You can also instantiate it in Splash screen of your app.
  
  – CopsOnRoad
  Mar 29 at 11:18
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @CopsOnRoad, that's what I am doing at the moment. The answer to my question would be 'it's not possible'.
  
  – Dean
  Mar 29 at 12:14
  

  
  
  
  

add a comment
 | 

I am trying to get some values saved in the SharedPreferences from a getter method of a class. But SharedPreferences.getInstance() returns a Future. Is there a way to obtain the SharedPreferences object in a non-async getter methods, for example:

import 'package:shared_preferences/shared_preferences.dart';

class MyClass 
 get someValue 
 return _sharedPreferencesObject.getString("someKey");
 

Is there something in Dart that is similar to .Result property in C#, for example getSomethingAsync().Result (https://docs.microsoft.com/en-us/dotnet/api/system.threading.tasks.task-1.result?view=netframework-4.7.2)?

dart flutter

share|improve this question

edited Mar 29 at 10:30

Dean

asked Mar 28 at 15:59

DeanDean

18211 gold badge44 silver badges1818 bronze badges

import 'package:shared_preferences/shared_preferences.dart';

class MyClass 
 get someValue 
 return _sharedPreferencesObject.getString("someKey");
 

dart flutter

dart flutter

share|improve this question

edited Mar 29 at 10:30

Dean

asked Mar 28 at 15:59

DeanDean

18211 gold badge44 silver badges1818 bronze badges

share|improve this question

edited Mar 29 at 10:30

Dean

asked Mar 28 at 15:59

DeanDean

18211 gold badge44 silver badges1818 bronze badges

asked Mar 28 at 15:59

DeanDean

18211 gold badge44 silver badges1818 bronze badges

asked Mar 28 at 15:59

DeanDean

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3 Answers
3

active

oldest

votes

2

You can do it in initState() and after this call setState() to update your build() method. Other way is to use FutureBuilder()

SharedPreferences sharedPrefs;

@override
void initState() 
 super.initState();
 SharedPreferences.getInstance().then((prefs) 
 setState(() => sharedPrefs = prefs);
 );

share|improve this answer

answered Mar 28 at 16:06

CopsOnRoadCopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges

add a comment
 | 

2

I believe Dart currently doesn't support such feature that is equivalent to .Result in C#. The workaround would be using FutureBuilder or inject object in the initState() method as mentioned in other answers.

share|improve this answer

edited Mar 29 at 12:19

CopsOnRoad

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answered Mar 29 at 12:17

DeanDean

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add a comment
 | 

1

You can use FutureBuilder()

SharedPreferences sharedPrefs;

@override
Widget build(BuildContext context) 
 return FutureBuilder(
 future: _getPrefs(),
 builder: (context, snapshot) 
 if (snapshot.hasData) 
 return YourFinalWidget();
 
 return CircularProgressIndicator(); // or some other widget
 ,
 );


Future<void> _getPrefs() async
 sharedPrefs = await SharedPreferences.getInstance();

share|improve this answer

answered Mar 28 at 16:12

CopsOnRoadCopsOnRoad

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add a comment
 | 

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2

You can do it in initState() and after this call setState() to update your build() method. Other way is to use FutureBuilder()

SharedPreferences sharedPrefs;

@override
void initState() 
 super.initState();
 SharedPreferences.getInstance().then((prefs) 
 setState(() => sharedPrefs = prefs);
 );

share|improve this answer

answered Mar 28 at 16:06

CopsOnRoadCopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges

add a comment
 | 

2

You can do it in initState() and after this call setState() to update your build() method. Other way is to use FutureBuilder()

SharedPreferences sharedPrefs;

@override
void initState() 
 super.initState();
 SharedPreferences.getInstance().then((prefs) 
 setState(() => sharedPrefs = prefs);
 );

share|improve this answer

answered Mar 28 at 16:06

CopsOnRoadCopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges

add a comment
 | 

You can do it in initState() and after this call setState() to update your build() method. Other way is to use FutureBuilder()

SharedPreferences sharedPrefs;

@override
void initState() 
 super.initState();
 SharedPreferences.getInstance().then((prefs) 
 setState(() => sharedPrefs = prefs);
 );

share|improve this answer

answered Mar 28 at 16:06

CopsOnRoadCopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges

SharedPreferences sharedPrefs;

@override
void initState() 
 super.initState();
 SharedPreferences.getInstance().then((prefs) 
 setState(() => sharedPrefs = prefs);
 );

share|improve this answer

answered Mar 28 at 16:06

CopsOnRoadCopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges

answered Mar 28 at 16:06

CopsOnRoadCopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges

answered Mar 28 at 16:06

CopsOnRoadCopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges

2

I believe Dart currently doesn't support such feature that is equivalent to .Result in C#. The workaround would be using FutureBuilder or inject object in the initState() method as mentioned in other answers.

share|improve this answer

edited Mar 29 at 12:19

CopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges

answered Mar 29 at 12:17

DeanDean

18211 gold badge44 silver badges1818 bronze badges

add a comment
 | 

2

I believe Dart currently doesn't support such feature that is equivalent to .Result in C#. The workaround would be using FutureBuilder or inject object in the initState() method as mentioned in other answers.

share|improve this answer

edited Mar 29 at 12:19

CopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges

answered Mar 29 at 12:17

DeanDean

18211 gold badge44 silver badges1818 bronze badges

add a comment
 | 

I believe Dart currently doesn't support such feature that is equivalent to .Result in C#. The workaround would be using FutureBuilder or inject object in the initState() method as mentioned in other answers.

share|improve this answer

edited Mar 29 at 12:19

CopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges

answered Mar 29 at 12:17

DeanDean

18211 gold badge44 silver badges1818 bronze badges

share|improve this answer

edited Mar 29 at 12:19

CopsOnRoad

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answered Mar 29 at 12:17

DeanDean

18211 gold badge44 silver badges1818 bronze badges

edited Mar 29 at 12:19

CopsOnRoad

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edited Mar 29 at 12:19

CopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges

answered Mar 29 at 12:17

DeanDean

18211 gold badge44 silver badges1818 bronze badges

answered Mar 29 at 12:17

DeanDean

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1

You can use FutureBuilder()

SharedPreferences sharedPrefs;

@override
Widget build(BuildContext context) 
 return FutureBuilder(
 future: _getPrefs(),
 builder: (context, snapshot) 
 if (snapshot.hasData) 
 return YourFinalWidget();
 
 return CircularProgressIndicator(); // or some other widget
 ,
 );


Future<void> _getPrefs() async
 sharedPrefs = await SharedPreferences.getInstance();

share|improve this answer

answered Mar 28 at 16:12

CopsOnRoadCopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges

add a comment
 | 

1

You can use FutureBuilder()

SharedPreferences sharedPrefs;

@override
Widget build(BuildContext context) 
 return FutureBuilder(
 future: _getPrefs(),
 builder: (context, snapshot) 
 if (snapshot.hasData) 
 return YourFinalWidget();
 
 return CircularProgressIndicator(); // or some other widget
 ,
 );


Future<void> _getPrefs() async
 sharedPrefs = await SharedPreferences.getInstance();

share|improve this answer

answered Mar 28 at 16:12

CopsOnRoadCopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges

add a comment
 | 

You can use FutureBuilder()

SharedPreferences sharedPrefs;

@override
Widget build(BuildContext context) 
 return FutureBuilder(
 future: _getPrefs(),
 builder: (context, snapshot) 
 if (snapshot.hasData) 
 return YourFinalWidget();
 
 return CircularProgressIndicator(); // or some other widget
 ,
 );


Future<void> _getPrefs() async
 sharedPrefs = await SharedPreferences.getInstance();

share|improve this answer

answered Mar 28 at 16:12

CopsOnRoadCopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges

SharedPreferences sharedPrefs;

@override
Widget build(BuildContext context) 
 return FutureBuilder(
 future: _getPrefs(),
 builder: (context, snapshot) 
 if (snapshot.hasData) 
 return YourFinalWidget();
 
 return CircularProgressIndicator(); // or some other widget
 ,
 );


Future<void> _getPrefs() async
 sharedPrefs = await SharedPreferences.getInstance();

share|improve this answer

answered Mar 28 at 16:12

CopsOnRoadCopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges

answered Mar 28 at 16:12

CopsOnRoadCopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges

answered Mar 28 at 16:12

CopsOnRoadCopsOnRoad

21.8k55 gold badges6161 silver badges5151 bronze badges