I'm tryin to use Sharedpreferences to save an arraylist of objects, but toJson and fromJson are causing fatal exceptions

Question

My object contains a String, long, and int. Object is called Tracker and I have an arrayList of Trackers. When I try to use toJson i get an error. The same with fromJson.

Answer 1

You can take a look at my SharedPreferences helper

// Save list object to another SharedPreference
SharedPreferencesManager.getInstance(AnotherPreferenceName).putValue("guns", guns);
List datas = SharedPreferencesManager.getInstance(AnotherPreferenceName).getValues("guns", Gun[].class); // get list object