Remove item from SharedPreference list [android]

Question

I want remove checked elements from my list, but not only from main app but from SharedPreferences also. Now, in my app i can remove chcecked elements but not from SharedPreferences, so if i come back to my activity all of removed elements are still visible. Please, help me.

This is my activity:

    SharedPreferences preferences;
    ArrayList<Object> list = new ArrayList<Object>();
    ArrayAdapter<Object> adapter;
    List<String> localization;
    Button btnDelete;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_moje_miejsca);

        btnDelete = (Button) findViewById(R.id.btnDelete);
        adapter = new ArrayAdapter<>(this,  android.R.layout.simple_list_item_multiple_choice, list);
        preferences = getSharedPreferences("coordinates", Activity.MODE_PRIVATE);

        Set<String> localizationSet = preferences.getStringSet("localization_set", new HashSet<String>());
        localization = new ArrayList<>(localizationSet);

        for (String listPosition : localizationSet) {
            list.add(listPosition);
            adapter.notifyDataSetChanged();
        }

        setListAdapter(adapter);


public void onClickBtnDelete(View view){

    SharedPreferences.Editor editor = preferences.edit();
    SparseBooleanArray checkedItemPositions = getListView().getCheckedItemPositions();
    int itemCount = getListView().getCount();

    for(int i = itemCount-1; i >= 0; i--){

        if(checkedItemPositions.get(i)){
            int position = i + 1;
            adapter.remove(list.get(i));    

        }
    }

    editor.remove("localization_set").commit();
    itemCount = getListView().getCount();

    checkedItemPositions.clear();
    adapter.notifyDataSetChanged();

    for (int i = itemCount-1; i >= 0; i--){

        localization.add((String) list.get(i));
        setLocalization = new HashSet<String>(localization);
        editor.putStringSet("localization_set", setLocalization).commit();

    }

}

}

Answer 1

To remove a specific saved pref then use

SharedPreferences.Editor editor = settings.edit();
editor.remove("tag_to_delete");
editor.commit();

To remove all of your saved preferences then use this

SharedPreferences.Editor editor = settings.edit();
editor.clear();
editor.commit();

Answer 2

I found a problem. It's my mistake. I forgot clear a list and thats why the list duplicate itself. It's enough to add a localization.clear() method to solve this problem