SharedPreferences does not update data

Question

I have Activity and service.

Activity store and update data into shared preferences file. I was update the data from Activity and then Service try to retrive changes, but he read the old values.

Code :

Saving\Updating :

@Override
public void save(VolumeBotSettings settings) {
    SharedPreferences.Editor edit = sharedPreferences.edit();
    edit.putInt(START_HOURS, settings.getStartHours());
    edit.putInt(START_MINUTES, settings.getStartMinutes());
    edit.putInt(END_HOURS, settings.getEndHours());
    edit.putInt(END_MINUTES, settings.getEndMinutes());

    edit.putInt(RING_VOLUME_LEVEL, settings.getRingVolumeLevel());
    edit.putInt(MUSIC_VOLUME_LEVEL, settings.getMusicVolumeLevel());
    edit.putInt(NOTIFICATION_VOLUME_LEVEL, settings.getNotificationVolumeLevel());
    edit.putInt(ALARM_VOLUME_LEVEL, settings.getAlarmVolumeLevel());
    edit.commit();
}

Read :

@Override
public VolumeBotSettings retrieve() {
    VolumeBotSettings settings = new VolumeBotSettings();
    settings.setStartHours(sharedPreferences.getInt(START_HOURS, UNDEFINED));
    settings.setEndHours(sharedPreferences.getInt(END_HOURS, UNDEFINED));
    settings.setStartMinutes(sharedPreferences.getInt(START_MINUTES, UNDEFINED));
    settings.setEndMinutes(sharedPreferences.getInt(END_MINUTES, UNDEFINED));

    settings.setRingVolumeLevel(sharedPreferences.getInt(RING_VOLUME_LEVEL, UNDEFINED));
    settings.setMusicVolumeLevel(sharedPreferences.getInt(MUSIC_VOLUME_LEVEL, UNDEFINED));
    settings.setNotificationVolumeLevel(sharedPreferences.getInt(NOTIFICATION_VOLUME_LEVEL, UNDEFINED));
    settings.setAlarmVolumeLevel(sharedPreferences.getInt(ALARM_VOLUME_LEVEL, UNDEFINED));

    if (settings.isNotNull())
        return settings;
    else
        return null;
}

Also i re-init shared preferences before using them.

private static final String VOLUME_BOT_PREFERENCES = "volume_bot_preferences";

public void init(Context context) {
    sharedPreferences = context.getSharedPreferences(VOLUME_BOT_PREFERENCES, Context.MODE_PRIVATE);
}

so the step-by-step actions :

Activity call init() method.
Activity call save() method.
Close Activity. Service is running.
Service call init() method.
Service call retrive() method.

And no data was updated. Please help me to understand why.

Note. init(),save(),retrieve() - methods of Singletone class that located in the same app.
Retrived settings is not null.

Are you using same `sharedPreferences` to save and retrieve data? — Green goblin, Nov 12 '14 at 23:14
@Aashish i hope yes. `VOLUME_BOT_PREFERENCES` is a constant value. It defines sp filename. — Sergey Shustikov, Nov 12 '14 at 23:15
When you set up the SharedPreference, you need to use `Context.MODE_MULTI_PROCESS`. http://stackoverflow.com/questions/12630926/sharedprefences-not-being-updated — DeeV, Nov 12 '14 at 23:21

score 2 · Accepted Answer · edited May 23 '17 at 11:59

2

I had this problem long ago from this question:

SharedPreferences does not update data

Final answer was that since it was across two separate processes, you have to set the flag Context.MODE_MULTI_PROCESS. SharedPreferences cache mappings in memory local to your app, so by default the memory isn't shared among processes. This was implemented in 2.3. I do not believe you can use this approach if supporting less than that.

edited May 23 '17 at 11:59

Community

1
1

answered Nov 12 '14 at 23:31

DeeV

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MODE_MULTI_PROCESS is deprecated since API 23. – Jyotman Singh Feb 19 '16 at 11:11

score 0 · Answer 2 · answered Nov 12 '14 at 23:25

0

Try that :

public void init(Context context)
{
    sharedPreferences = context.getSharedPreferences(VOLUME_BOT_PREFERENCES, Context.MODE_MULTI_PROCESS);
}

About this flag :

when set, the file on disk will be checked for modification even if the shared preferences instance is already loaded in this process.

answered Nov 12 '14 at 23:25

ToYonos

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Sorry,but the @DeeV answered firstly in comment. I for the honesty) Nothing Personal) – Sergey Shustikov Nov 12 '14 at 23:31
Not a problem, i did not see his comment ;) – ToYonos Nov 12 '14 at 23:33

SharedPreferences does not update data

2 Answers2