Android Save object as blob in sqlite

Question

is this right. I have this gridview. I want to save its item as blob in sqlite. so when i open the list of save data in sqlite ill just load the save item

Answer 1

The way I store data as BLOB in my DB, is by converting them to JSON and then storing the bytes. e.g.

ArrayList<Person> persons  = new ArrayList<>();
Gson gson = new Gson();
ContentValues values = new ContentValues();
values.put(MyProvider.KEY_DATA, gson.toJson(persons).getBytes());
// insert or update the DB

And to get the list back

byte[] blob = cursor.getBlob(cursor.getColumnIndex(MyProvider.KEY_DATA));
String json = new String(blob);
Gson gson = new Gson();
ArrayList<Person> persons = gson.fromJson(json, new TypeToken<ArrayList<Person>>()
                                 {}.getType());

Edit: to answer your last question, you should store your data (list of items).

Answer 2

instead of (Object o), pass (Serializable o). Then, in the stuff you pass, add implements Serializable to class definition.