Storing Array List Object in SharedPreferences

Question

This method add new object into ArrayList

//get text from textview
time = date.getText().toString();
entry_d = entry.getText().toString();
dayName = day.getText().toString();

arrayList.add( new ArrayObject( dayName, entry_d ,time));

I am trying to add these 3 strings in SharedPrefrences. Here is my code:

private void savePreferences(String key, String value) {

    SharedPreferences sharedPreferences = PreferenceManager             
                                     .getDefaultSharedPreferences(this);
    Editor editor = sharedPreferences.edit();
    editor.putBoolean(key, value);
    editor.commit();
}

This method only add one string at a time where as I want to add 3 strings in one go. Is there any method I can implement.

I hope this is you question and resolve by this answer, https://stackoverflow.com/a/75003482/12748481 — Surajkaran Meghwanshi
– Surajkaran Meghwanshi, Commented Jan 4, 2023 at 9:35

Sinan Kozak · Accepted Answer · 2018-06-08 12:28:59Z

87

Convert your array or object to Json with Gson library and store your data as String in json format.

Save;

SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
Editor editor = sharedPrefs.edit();
Gson gson = new Gson();

String json = gson.toJson(arrayList);

editor.putString(TAG, json);
editor.commit();

Read;

SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
Gson gson = new Gson();
String json = sharedPrefs.getString(TAG, "");
Type type = new TypeToken<List<ArrayObject>>() {}.getType();
List<ArrayObject> arrayList = gson.fromJson(json, type);

edited Jun 8, 2018 at 12:28

answered Apr 10, 2014 at 10:39

Sinan Kozak

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5 Comments

Vintesh Over a year ago

For which Type Classes to import - stackoverflow.com/questions/20847997/…

Nitin_Narale Over a year ago

use import java.lang.reflect.Type;

ajay dhadhal Over a year ago

what to do if arrayList is List<View> ?

Sinan Kozak Over a year ago

Do not persist framework object or any complex object like view.

Michał Schmude Over a year ago

Two days I tried to add json content to array list. Thank you. I used get type and everything works

Hari krishna Andhra Pradesh · Accepted Answer · 2015-05-15 08:01:32Z

22

Store Arraylist Using Shared Preferences

SharedPreferences prefs=this.getSharedPreferences("yourPrefsKey",Context.MODE_PRIVATE);
Editor edit=prefs.edit();

Set<String> set = new HashSet<String>();
set.addAll(your Arraylist Name);
edit.putStringSet("yourKey", set);
edit.commit();

Retrieve Arraylist from Shared Preferences

Set<String> set = prefs.getStringSet("yourKey", null);
List<String> sample=new ArrayList<String>(set);

answered May 15, 2015 at 8:01

Hari krishna Andhra Pradesh

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6 Comments

Prabs Over a year ago

can we use a single set do add more than 1 array list...I have 3 string array list.May I use single set or 3 sets for 3 lists

Anshul Tyagi Over a year ago

@Prabs did you create separate sets/?

Prabs Over a year ago

@AnshulTyagi this sets concepts didn't worked for my requirement..So I didn't implemented this concept..For testing,Yes I've created separate sets.

Hari krishna Andhra Pradesh Over a year ago

Sorry for that. it will support only Set<String> not others.

Ahmad Alkhatib Over a year ago

it's only for Set<String> :\ !

|

CopsOnRoad · Accepted Answer · 2018-03-29 10:25:42Z

3

Don't use Hashset for this. It will change the ordering of Arraylist. Use Gson instead. If you wish to use Hashset, you will have to serialize and deserialize which will take up resources.

edited Mar 29, 2018 at 10:25

CopsOnRoad

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answered Sep 1, 2017 at 23:25

user8406645

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