store Array in sharedpreferences

Question

I have an Array with integer values. It will grow over time. It will have approximately up to 50 values. I want to store the array persistent and thus I thought about storing it in SharedPreferences. I know that no complex types can be stored in it, but I also heard about to serialise the Array and then store it in SharedPreferences. Can someone give me a hint or even better sample code how to do that?

You can also refer to this [ANSWER](http://stackoverflow.com/questions/7175880/how-can-i-store-an-integer-array-in-sharedpreferences) — srujan maddula, Feb 19 '14 at 06:19

score 4 · Accepted Answer · answered Jan 03 '12 at 17:59

4

Not very efficient way, but will get the job done:

SharedPreferences prefs = ...;
final int count = 50;
final String KEY_COUNT = "COUNT";
final String KEY_VAL_PREFIX = "VAL_";
int values[] = new int[count];

/*
 * ... put some stuff in values[] ...
 */

final Editor sped = prefs.edit();
sped.putInt(KEY_COUNT, count);
for (int i = 0; i < count; i++)
{
    sped.putInt(KEY_VAL_PREFIX + i, values[i]);
}
sped.commit();

Then later you can retrieve these values by grabbing the KEY_COUNT value from the prefs, then filling your empty array with values2[i] = getInt(KEY_VAL_PREFIX + i, 0) calls.

answered Jan 03 '12 at 17:59

Josh

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:Do you think you can help me with this?http://stackoverflow.com/questions/9209673/using-preferences-my-listview-is-empty-cant-store-data – George Feb 16 '12 at 12:52
@Josh can you include the whole code for the getter and setter? – HeartlessArchangel Jun 28 '13 at 23:54

score 1 · Answer 2 · answered Jul 22 '14 at 20:07

I would convert your array to a string of values separated by commas. And then store the string as a single key-value pair.

Then, when you want to extract the array, simple use the split function to split the string up into array elements based on a comma separator.

score 1 · Answer 3 · edited May 23 '17 at 10:28

1

You may use ObjectSerializer to do it. Here is SO discussion on how to do.Store Shared preferences

edited May 23 '17 at 10:28

Community

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answered Jan 03 '12 at 15:39

kosa

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store Array in sharedpreferences

3 Answers3

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