Get Strings from ArrayList and save in Shared Preferences

Question

I have an ArrayList that can contain 1 to 15 strings. Those strings need to be saved in my shared preferences, now I know how to iterate trough the array to get the strings. What I don't know, is there a clean way to dynamically add the strings to my shared preferences file? I could do this on a sluggish way by creating 15 strings and using an if statement to fill the shared preference, but I would like to know if there is a better way.

Thank you.

You can use a Database instead of Shared Preferences: i think is better for CRUD operation with your data. — JJ86
– JJ86, Commented Mar 28, 2013 at 9:19
see this excellent post for Save ArrayList to SharedPreferences instead of creating 15 keys in sharedpreferences and you can also do same by converting ArrayList to JsonArray — ρяσѕρєя K
– ρяσѕρєя K, Commented Mar 28, 2013 at 9:24

Archie.bpgc · Accepted Answer · 2013-03-28 09:21:23Z

5

If its about naming, you can use something like this:

public static final String mPrefix = "mArray";
SharedPreferences prefs;
prefs  = this.getSharedPreferences("PREF", 0);
prefsEditor = appSharedPrefs.edit();

//mAL is your ArrayList

for(int i=0; i<mAl.size(); i++){

prefsEditor.putString(mPrefix + "-" + i, mAl.get(i));
}
prefsEditor.commit();

answered Mar 28, 2013 at 9:21

Archie.bpgc

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1 Comment

Raymond P Over a year ago

Thank you, I wasn't aware that was possible.

waqaslam · Accepted Answer · 2013-03-28 09:28:18Z

5

You can use the putStringSet method available in SharedPreferences.Editor to store string arrays. For example:

String[] array = new String[]{"this", "is", "a", "string", "array"};
SharedPreferences.Editor edit = sharedPrefs.edit();
edit.putStringSet("myKey", new HashSet<String>(Arrays.asList(array)));
edit.commit();

Or if your API is below 11 then you may convert your string array into a single string and save it just like an ordinary string. For example:

edit.putString("myKey", TextUtils.join(",", array));

and later use the following to rebuild your array from string:

array = TextUtils.split(sharedPrefs.getString("myKey", null), ",");

edited Mar 28, 2013 at 9:28

answered Mar 28, 2013 at 9:17

waqaslam

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2 Comments

baldguy Over a year ago

putStringSet available only after api 11. You can't use it in earlier android versions.

Raymond P Over a year ago

I noticed that one, I'm building for min api level 8. But thanks anyway.

Ido · Accepted Answer · 2013-03-28 09:25:25Z

1

Mainly to edit the shared prefernces data you need to take the Editor Object from it so you could edit it freely so to put data in it:

SharedPrefernces preferences = mContext.getSharedPreferences(MODE_PRIVATE);
Editor prefEditor = preferences.edit();
prefEditor.putString("this is a key object","this is value of the key");

You can also put inside different kinds of object for example : boolean , int , float , double and etc.... Just look up the editor class in android developers website...

In order to read the data from the sharedPrefrences it is even more simplier

SharedPrefrences pref = mContext.getSharedPreferences(MODE_PRIVATE);
pref.getString("the key of the value");

answered Mar 28, 2013 at 9:25

Ido

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