我无法将数据保存到Shareprefence字符串

Question

我将字符串保存到SharedPreference时遇到问题。此类保存号码卡并从SharedPreference获取字符串。 这是我的班级MyShrePreference。我不知道为什么该字符串没有保存到SharedPreference。

public class MySharepreference {

    public static final String PREFS_NAME = "POSITION";
    public static final String POSITION = "current";
    public String nameString;

    public MySharepreference() {
        super();
    }


    public void saveNumberCard(Context context, String position) {
        SharedPreferences settings;
        SharedPreferences.Editor editor;
        settings = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
        editor = settings.edit();
        editor.putString(POSITION, position);
        editor.commit();
    }

    public String getNumberCard(Context context) {
        SharedPreferences sharedPreferences;
        sharedPreferences = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
        if (sharedPreferences.contains(POSITION)) {
            nameString = sharedPreferences.getString(POSITION, "");
        }
        return nameString;
    }

}

保存到适配器的SharedPreference

onBindViewHolder

 @Override
    public void onBindViewHolder(CardViewHolder holder, final int position) {

  mySharepreference = new MySharepreference();

        if (position == lastCheckedPos) {
            mySharepreference.saveNumberCard(mContext, card.getNumberCard());
}