markSessionEnd function

Implementation

Future<void> markSessionEnd() async {
  SharedPreferences prefs = await SharedPreferences.getInstance();
  if (prefs.getString("app_state") == 'resumed') {
    var sessionEnd = DateTime.now().millisecondsSinceEpoch;
    await prefs.setInt("session-end", sessionEnd);
    await prefs.setString("app_state", "inactive");
  }
}