Save ArrayList to SharedPreferences

Question

I have an ArrayList with custom objects. Each custom object contains a variety of strings and numbers. I need the array to stick around even if the user leaves

Answer 1

You can also convert the arraylist into a String and save that in preference

private String convertToString(ArrayList list) {

            StringBuilder sb = new StringBuilder();
            String delim = "";
            for (String s : list)
            {
                sb.append(delim);
                sb.append(s);;
                delim = ",";
            }
            return sb.toString();
        }

private ArrayList convertToArray(String string) {

            ArrayList list = new ArrayList(Arrays.asList(string.split(",")));
            return list;
        }

You can save the Arraylist after converting it to string using convertToString method and retrieve the string and convert it to array using convertToArray

After API 11 you can save set directly to SharedPreferences though !!! :)