CODEWITHSUNDEEP
androidarrayssharedpreferencespersistent
tobias
tobias

Reputation: 2362

store Array in sharedpreferences

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?

Upvotes: 1

Views: 5914

Answers (3)

user3469294
user3469294

Reputation: 101

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.

Upvotes: 1

Josh
Josh

Reputation: 10738

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.

Upvotes: 4

kosa
kosa

Reputation: 66657

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

Upvotes: 1

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