set and get

Learn setString, getInt and getString methods.

set and get methods

To write data with shared_preferences, you use setString, setInt, setBool, setDouble methods. To read, you call getString, getInt, getBool methods. Set methods return Future<bool>, get methods return the value (or null).

await prefs.setString('name', 'Ada');  // write
await prefs.setInt('age', 25);          // write

prefs.getString('name');  // 'Ada'
prefs.getInt('age');      // 25

Get methods and null

If the key hasn't been written before, get methods return null. You can provide a default value with the ?? operator: prefs.getString('theme') ?? 'light'. This way the default theme is used on first launch.

final theme = prefs.getString('theme') ?? 'light';
final count = prefs.getInt('count') ?? 0;

Exercise Write with setInt, read with getInt

Get prefs with getInstance, write a value with setInt('count', 7), read it with getInt('count'), and print it.

Show example solution

import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  final prefs = await SharedPreferences.getInstance();
  await prefs.setInt('count', 7);
  print(prefs.getInt('count'));
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(home: Scaffold(body: Center(child: Text('set ve get')));
  }
}

Test yourself

Which method is used to read a stored int value?
- getString
- setInt
- setString
- getInt
Show answer

getInt — To read an int value, use getInt; setInt is for writing, and getString reads a String.

Write a value with setInt

await prefs.____;

Show answer

await prefs.setInt('count', 7);

Method - type matching

setString

Writes a String
getString

Reads a String
setInt

Writes an int
getInt

Reads an int

Next lesson: Save theme

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