SharedPreferences默认值

Question

我在我的适配器中使用sharedpreferences，而不是获得默认值-1 ，而是获得0作为默认值。 谁能告诉我为什么会这样？

这是我的代码：

//constructor
public PlaylistAdapter(Activity a, ArrayList<Songs> songs) {
        activity = a;
        data = songs;
        prefs = a.getSharedPreferences("com.myapp",
                Context.MODE_PRIVATE);
        db = new DatabaseHelper(a);
        inflater = (LayoutInflater) activity
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    public View getView(final int position, View convertView,
            final ViewGroup parent) {
        View vi = convertView;
        if (convertView == null)
            vi = inflater.inflate(R.layout.song_item, parent, false);
int playpos = prefs.getInt("posPlaying", -1);
//logs 0 as prefsvalue(should be -1) and the position
        Log.v("--", prefs.getInt("posPlaying", -1) + " " + position);

}

Answer 1

如果posplaying不保存任何值，那么只会使用默认值。所以我认为posplaying会将值保存为0.检查是否将此值初始化为0或其他计算使posplaying为0。