Save custom object array to Shared Preferences

Question

Can I save my own object array to the SharedPreferences, like in the post below?

Android ArrayList of custom objects - Save to SharedPreferences - Serializable?

But there he doesn't save an array, so is there a possibility to save a custom object array to SharedPreferences like in the post of the link?

Sobhan Moradi · Accepted Answer · 2016-11-12 18:13:33Z

32

You can use gson to serialize class objects and store them into SharedPreferences. You can downlaod this jar from here https://code.google.com/p/google-gson/downloads/list

SharedPreferences  mPrefs = getPreferences(Context.MODE_PRIVATE);

To Save:

Editor prefsEditor = mPrefs.edit();
Gson gson = new Gson();
String json = gson.toJson(MyObject);
prefsEditor.putString("MyObject", json);
prefsEditor.commit();

To Retreive:

Gson gson = new Gson();
String json = mPrefs.getString("MyObject", "");
MyObject obj = gson.fromJson(json, MyObject.class);

edited Nov 12, 2016 at 18:13

Sobhan Moradi

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answered Dec 28, 2013 at 21:24

Or Bar

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6 Comments

MEX Over a year ago

Thanks very helpfull but how can I do this with an array of my own object?

Or Bar Over a year ago

take a look at this answer: stackoverflow.com/a/9198626/2333395 It uses ArrayList, but shouldn't be to hard to modify for use with regular array

Prazzy Kumar Over a year ago

Put that array inside another object that implements serializable and use the above code in onPause and OnResume

user3233280 Over a year ago

how can i save model class object in arraylist and then save araylist in sharedpreferences and similarly get araylist from sharedpreferences @OrBar

vedi0boy Over a year ago

I have a question if anyone is still watching this thread: What happens if you modify the class for the object (like adding variables, etc), will it still be able to deserialize the old object and put its data into the new one?

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