SharedPreferences reset: Map size is not 0 after reset

Question

I'm trying to delete my SharedPreferences, but it's not working: size is not set to 0 as I would expect.

SharedPreferences sp = context.getSharedPreferences(name, mode);
SharedPreferences.Editor e = sp.edit();
e.clear();
e.commit();
Map<String, ?> map = sp.getAll();
int size = map.size();

Any suggestions?

private static String name = "ABC_PREFS";
private static int mode = Context.MODE_PRIVATE;

`android`>`settings`>`applications`>`manage applications`>`your app`>`clear data` :) — deadfish, Nov 19 '12 at 14:32
I guess I should have said that I want to do this at runtime. — gosr, Nov 19 '12 at 14:38
@CommonsWare Everything that I have saved in the preferences previously. — gosr, Nov 19 '12 at 16:35
Is that the exact code you're using? or are there any other calls in between? Also, check what does the `commit()` calls returns. `true` or `false` — La bla bla, Nov 25 '12 at 23:34
@Lablabla It is. Those 6 lines are just implemented in a `public void clearPreferences()` method. Well, there is 1 more line after `int size = ...` but that's just a Toast to read the `size` value. `commit()` returns `true`. — gosr, Nov 25 '12 at 23:37
I copy and pasted it, and it works for me.. It shows size 0 after clearing.. weird.. — La bla bla, Nov 25 '12 at 23:46
Do you have more than one editor opening and modifying preferences at the same time? It sound like a race condition. — yorkw, Nov 26 '12 at 20:12
Please check(Answer 5) in this link http://stackoverflow.com/questions/3687315/deleting-shared-preferences — Chandrashekhar, Nov 27 '12 at 09:59

score 2 · Accepted Answer · answered Nov 26 '12 at 09:03

2

Your code looks fine from reading through it. Are you sure that context variable is initialized properly? Are other SharedPreferences variables pointing to the same file perhaps?

If these are not the problem, please consider taking a minimal sample app and paste this code in to see if it still fails. It is easier to fix a problem like this with the complete app than with just a code snippet.

answered Nov 26 '12 at 09:03

gabriel

1,163
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I think this is the closest I get to an answer I can use. I fixed it by using `App.getContext()` as context, where `App` is an Application class and the context in that is set at `onCreate()` in this class. So yes, it was a Context issue. Many points your way ;) – gosr Dec 02 '12 at 20:27

score 0 · Answer 2 · answered Dec 01 '12 at 22:00

SharedPreferences.Editor.clear() just removes only values of your preferences is that not enough for you? You can remove all your entries with SharedPreferences.Editor.remove():

    for (String key: sp.getAll().keySet()) {
        e.remove(key);
    }
    e.commit();

score -3 · Answer 3 · answered Nov 26 '12 at 00:14

-3

You can write size of map into shared preferences:

e.clear();
e.putInt("size", map.size());
e.commit();

To get size of map call:

int size = sp.getInt("size", 0);

answered Nov 26 '12 at 00:14

Artyom Kiriliyk

2,513
1
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SharedPreferences reset: Map size is not 0 after reset

3 Answers3