在SharedPreferences中保持StringSet的Android不起作用

Question

我想保留＆＃34;收藏夹＆＃34;在SharedPreferences中记录，但出了点问题。在独立于此的SharedPreferences中，我正在做的事情总是有一条记录。第一个我决定添加。我正在检查，但是删除它效果很好，但在完成重新启动或重新安装应用程序后，问题又回来了。我添加3条记录，重新启动应用程序，首先我添加了。我删除它，添加另一个，重新启动应用程序，有午餐前的第一个。我删除它，重新启动应用程序，这个仍然存在。我删除它，添加另一个，重新启动应用程序，前一个在列表中。我试过了：

我的适配器，显示我要保留的一条记录：

public class DayFavouriteAdapter extends ArrayAdapter<String> {
    private Context context;
    private String[] values;

    public DayFavouriteAdapter(Context context, String[] values) {
        super(context, R.layout.day_favourite, values);
        this.context = context;
        this.values = values;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        final View day = inflater.inflate(R.layout.day_favourite, parent, false);

        final SharedPreferences prefs = Data.getPreferences(context, null);
        final Set<String> favs = prefs.getStringSet(Data.favourites, new HashSet<String>());

        day.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                final Activity activity = FavouriteActivity.getInstance();
                AlertDialog.Builder deleting = new AlertDialog.Builder(activity);
                deleting.setTitle("Deleting");
                deleting.setMessage("Are you sure?");
                deleting.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        boolean a = favs.remove(favs.toArray(new String[]{})[position]); //a is always true, misstake is impossible
                        Log.d("AC", favs.toString() + ""); //returns correct result
                        SharedPreferences.Editor editor = prefs.edit();
                        editor.putStringSet(Data.favourites, favs);
                        editor.commit();
                        editor.apply();
                        Log.d("AC", prefs.getStringSet(Data.favourites, new HashSet<String>()) + ""); //returns correct result
                        activity.recreate(); //after this, everything is cool.
                    }
                });
                deleting.setNegativeButton("No", null);
                deleting.show();
                return false;
            }
        });
        return day;
    }
}

我的Data.java（如果需要）：

public abstract class Data {
    public static final String favourites = "favourites";
    public static final SharedPreferences getPreferences(Context context, String s) {
        if (s==null) {
            return PreferenceManager.getDefaultSharedPreferences(context);
        }
        return context.getSharedPreferences(s, Activity.MODE_PRIVATE);
    }
}

我正在使用几种方法来做到这一点，但任何方法都有效。