Android shared preferences not saving

Question

I\'ve created an Android live wallpaper and i\'m trying to let a user choose an image from their phone and apply it as a background image, but when I launch the activity tha

Answer 1

Try another way of initializing your SharedPreferences variable:

SharedPreferences sf = PreferenceManager.getDefaultSharedPreferences(this);

You can also chain writing to sf with sf.edit().putString(string, value).commit();

Answer 2

Bear in mind that you need the same activity to save and retrieve data. You can not use a method like

public String readValue(Activity activity, String key) {
    SharedPreferences sp = activity.getPreferences(Context.Mode_PRIVATE);
   //...
}

For receiving the same data from the same activity you need to call this method with the exact same activity which you had saved your data.

Answer 3

From the documentation:

Create a new Editor for these preferences, through which you can make modifications to the data in the preferences and atomically commit those changes back to the SharedPreferences object.

Since that's a new Editor instance, your code should be more like this:

preferences = getApplicationContext().getSharedPreferences(PREFERENCES_NAME, 0);
SharedPreferences.Editor editor = preferences.edit();
editor.putString(SETTINGS_BACKGROUND_IMAGE, "okok");
editor.apply();

Answer 4

well, based on @zrgiu post, for me only worked adding editor.clear(); before use the Editor...so the final code will be something like:

preferences = getApplicationContext().getSharedPreferences(PREFERENCES_NAME, 0);
SharedPreferences.Editor editor = preferences.edit();
editor.clear();
editor.putString(SETTINGS_BACKGROUND_IMAGE, "okok");
editor.commit();

;)

Answer 5

In my case I had to add editor.apply(); before commit in order to work.

This is my code:

preferences = getApplicationContext().getSharedPreferences(PREFERENCES_NAME, 0);
SharedPreferences.Editor editor = preferences.edit();
editor.putString(SETTINGS_BACKGROUND_IMAGE, "okok");
editor.apply();//I added this line and started to work...
editor.commit();