Local storage in Flutter

1. Shared Preference
2. Local database
3. Local files

Flutter version: 1.22.5

Shared Preference

key-value pair stored in XML files. DataTypes - float, int, long, boolean and string Flutter package: shared_preferences

sharedPreferences = await SharedPreferences.getInstance();
sharedPreferences.setString(key, value);
sharedPreferences.get(key);
sharedPreferences.remove(key);

Local Files

Save strings, images, and objects to files - after serialized to strings. DataTypes - string Flutter package: path_provider

final directory = await getApplicationDocumentsDirectory();
await file.readAsString();
await file.writeAsString(data);

Local SQL database

Save Complex objects in Table DataTypes - Table Flutter package: sqflite

database = await openDatabase( join(await getDatabasesPath(), '$tableName.db') );
await database.insert( tableName, json );
await database.query(tableName);