Saving Data in Flutter

Jan 31 2024 · Dart 3, Flutter 3.10, Visual Studio Code

Part 2: Use SharedPreferences & Secure Storage

09. Using flutter_secure_storage

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Previous episode: 08. Challenge: Add a Field Next episode: 10. Use path & path_provider

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Storing locally user credentials or other sensitive data is a rather common task for apps. While SharedPreferences is ideal to store simple data, it’s certainly not the right tool to store sensitive data, as data is not encrypted.

final storage = FlutterSecureStorage(); 

await storage.write(key: 'your_key', value: 'your_value'); 

String value = await storage.read(key: 'your_key'); 

await storage.delete(key: 'your_key'); 

Flutter pub add flutter_secure_storage 

final FlutterSecureStorage _secureStorage = const FlutterSecureStorage(); 

final calories = await _secureStorage.read(key: _caloriesKey) ?? ‘2000’; 

return int.parse(calories); 

final showFileSize = await _secureStorage.read(key: _showFileSizeKey)  
  ?? 'true'; 

return bool.parse(showFileSize); 

final showDate =await _secureStorage.read(key: _showDateKey) ?? 'true'; 
    return bool.parse(showDate); 

Future deleteSettings() async { 
  await _secureStorage.delete(key: _listNameKey); 
  await _secureStorage.delete(key: _caloriesKey); 
  await _secureStorage.delete(key: _showFileSizeKey); 
}