Storing a String array in the SharedPreferences

Question

I was wondering if it could be possible to save in the shared preferences an array of Strings, in a way that, every time we save a certain String, we store it in that array.

Answer 1

You could make the array a JSON array and then store it like this:

SharedPreferences settings = getSharedPreferences("SETTINGS KEY", 0);
SharedPreferences.Editor editor = settings.edit();

JSONArray jArray = new JSONArray();
try {
    jArray.put(id);
} catch (JSONException e) {
    e.printStackTrace();
}

editor.putString("jArray", jArray.toString());
editor.commit();

You can then get the array like this:

SharedPreferences settings = getSharedPreferences("SETTINGS KEY", 0);
try {
    JSONArray jArray = new JSONArray(settings.getString("jArray", ""));
} catch (JSONException e) {
    e.printStackTrace();
}

Just an alternative solution that I have used in the past

Answer 2

This is doable: I was just blogging about it:

SAVE YOUR ARRAY

//String array[]
//SharedPreferences prefs
Editor edit = prefs.edit();
edit.putInt("array_size", array.length);
for(int i=0;i<array.length; i++)
    edit.putString("array_" + i, array[i]);
edit.commit();

RETRIEVE YOUR ARRAY

int size = prefs.getInt("array_size", 0);
array = new String[size];
for(int i=0; i<size; i++)
    prefs.getString("array_" + i, null);

---

Just wrote that so there might be typos.

Answer 3

Write methods to read and write a serialized array. This shouldn't be too difficult. Just flatten the array of strings into a single string that you store in the preferences. Another option would be to convert the array into an XML structure that you then store in the preferences, but that is probably overkill.