How to store array in an sharedpreferences in android

Question

I am building an android application where the user selects his event from spinner tool.

The Spinner tool displays the array list that user had selected first time the application is launched.

Now I had parsed the array list from app launch page to spinner activity class an using it in spinner tool success full now.

Here is code:

public static ArrayList<String> array;

Here, the name array has the arraylist. I need to store this in sharedprefrences. How can I do this ?

I am new to android.

@Sonam Check this link http://stackoverflow.com/questions/7057845/save-arraylist-to-sharedpreferences — Piyush, Nov 18 '14 at 09:39
[have a look here](http://stackoverflow.com/a/10241602/2591002) — SweetWisher ツ, Nov 18 '14 at 10:01

score 1 · Answer 1 · 2014-11-21T09:00:05.747

I don't suggest using putStringSet() since it will screw up your arrayorder.

I suggest running a for loop over your array and giving them different key names. + in the end adding another String, that tells you how long the array is once you wanna read out the strings of the SharedPreferences.

General settings:

SharedPreferences sharedPreferences = getSharedPreferences("YOURKEYFILE", Activity.MODE_PRIVATE);
SharedPreferences.Editor sharedPreferencesEditor = sharedPreferences.edit();

Save String Array:

for (int i = 0; i < array.size(); i++) {
    sharedPreferencesEditor.putString("StringArrayElement" +i, array.get(i));
}
sharedPreferencesEditor.putInt("StringArrayLength", array.size());
sharedPreferencesEditor.commit();

Read String Array:

array.clear();
for (int i = 0; i < sharedPreferencesEditor.getInt("StringArrayLength", 0) {
    array.add(sharedPreferencesEditor.getString("StringArrayElement" +i, "");
}

NOTE: The above code is untested! Community correct me there if you find mistakes.

@Sonam Did you try out my solution yet? Do you understand my solution? — , Nov 26 '14 at 13:12

score 0 · Answer 2 · answered Nov 18 '14 at 09:36

0

You can save your array as Serializable object.

//save the task list to preference
SharedPreferences prefs = getSharedPreferences(SHARED_PREFS_FILE, Context.MODE_PRIVATE);
Editor editor = prefs.edit();
try {
    editor.putString(ARRAY, ObjectSerializer.serialize(array));
} catch (IOException e) {
    e.printStackTrace();
}
editor.commit();

And to retrieve it from SharedPreferences:

SharedPreferences prefs = getSharedPreferences(SHARED_PREFS_FILE, Context.MODE_PRIVATE);

try {
    array = (ArrayList<String>) ObjectSerializer.deserialize(prefs.getString(ARRAY,
         ObjectSerializer.serialize(new ArrayList<String>())));
} catch (IOException e) {
    e.printStackTrace();
} catch (ClassNotFoundException e) {
    e.printStackTrace();
}

You can get ObjectSerializer.java from here

answered Nov 18 '14 at 09:36

Forin

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In ObjectSerializer. java class error in WrappedIOException -WrappedIOException cannot be resolved.. please help me – Test123 Nov 18 '14 at 09:40
Have you imported it ?? – Piyush Nov 18 '14 at 09:44
@Sonam For other solution you can convert arraylist to String array and save that array to SP and retrieve it easily too.!! – Piyush Nov 18 '14 at 09:49
@PiyushGupta I used it but when I am Toasting the value save in SharedPreferences there is null toasting in it. – Test123 Nov 18 '14 at 10:36
i m getting same error @PiyushGupta mentioned over here working with custom objects how can i overcome in this situation ? – Erum Dec 08 '14 at 05:40
@Test123 how u resolved this issue WrappedIOException cannot be resolved – Erum Mar 04 '15 at 10:16
Use `Log.e("Serialization error: ", e.toString());` and import `import android.util.Log;` – Iman Marashi May 02 '15 at 22:29

devcelebi · Answer 3 · 2014-11-18T09:46:48.860

0

This code help to you maybe.You save list item by counter i.

for(int i=0;i<list.size();i++)
    {
editor.putString(list.get(i)+i, list.get(i));
editor.commit();}
for(int i=0;i<list.size();i++)
    {
preferences.getString(list.get(i)+i, "");
    }

edited Nov 18 '14 at 09:46

answered Nov 18 '14 at 09:36

devcelebi

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score 0 · Answer 4 · answered Nov 18 '14 at 10:07

0

It's better to go with Set<String> as API version 11 introduced methods putStringSet and getStringSet which allows the developer to store a list of string values and retrieve a list of string values, respectively.

Save list

// Save the list.
editor.putStringSet("array", myStrings);
editor.commit();

Fetch list

// Get the current list.
SharedPreferences settings = this.getSharedPreferences("YourActivityPreferences", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
Set<String> myStrings = settings.getStringSet("array", new HashSet<String>());

answered Nov 18 '14 at 10:07

SweetWisher ツ

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Here is showing an error on putString - The method putStringSet(String, Set) in the type SharedPreferences.Editor is not applicable for the arguments (String, ArrayList). please help to resolving it – Test123 Nov 18 '14 at 10:30
You need to use `Set` instead of `ArrayList` – SweetWisher ツ Nov 18 '14 at 10:38
But I am parsing the value from firstactivity to other so i am using ArrayList so please tell me alter way to do this – Test123 Nov 18 '14 at 10:39
Can i store the value of ArrayList to Set in same activity – Test123 Nov 18 '14 at 10:40
Yes you can. ..please check the android developer site to work with set or refer java tutorial – SweetWisher ツ Nov 18 '14 at 16:13

How to store array in an sharedpreferences in android

4 Answers4

Save list

Fetch list