init method
Implementation
Future init() async {
_sharedPreferences = await SharedPreferences.getInstance();
_accessToken = _sharedPreferences!.getString(_accessTokenName);
_refreshToken = _sharedPreferences!.getString(_refreshTokenName);
var deathDate = _sharedPreferences!.getInt(_deathDateName);
if (deathDate != null) {
_deathDate = DateTime.fromMillisecondsSinceEpoch(deathDate);
}
}