Android SharedPreferences String Set - some items are removed after app restart

Question

I save a string set in the shared preferences, if I read it out it\'s ok. I start other activities, go back and read it again, it\'s ok. If I close the application, and start it

Answer 1

Try to create Copy of your set, and than you can save it in same prefs:

private Set _setFromPrefs;


public void GetSetFromPrefs()
{
    SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(getContext());
    Set someSets = sharedPref.getStringSet("some_sets", new HashSet() );
    _setFromPrefs = new HashSet<>(someSets); // THIS LINE CREATE A COPY
}


public void SaveSetsInPrefs()
{
    SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(getContext());
    SharedPreferences.Editor editor = sharedPref.edit();
    editor.putStringSet("some_sets", _setFromPrefs);
    editor.commit();
}