我无法从导航视图中删除项目

Question

我在Navigationview中有一个项目列表，这些项目是通过程序添加的-我使用sharedpreferences保存和还原它们，一切正常。我可以删除第一个项目-选择删除哪个项目都没关系-但是当我尝试删除第二个项目时，它将引发此异常：

java.lang.IndexOutOfBoundsException：索引：0，大小：0

如何解决此问题？

这是我的代码：

private void saveData() {
    SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREF_LIST_KEY, MODE_PRIVATE);
    SharedPreferences.Editor editor = sharedPreferences.edit();
    Gson gson = new Gson();
    String json = gson.toJson(navItems);
    editor.putString(SHARED_PREF_LIST_KEY_ITEM, json);
    editor.apply();
}

private void loadData() {
    SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREF_LIST_KEY, MODE_PRIVATE);
    Gson gson = new Gson();
    String json = sharedPreferences.getString(SHARED_PREF_LIST_KEY_ITEM, null);
    Type type = new TypeToken<ArrayList<NavItem>>() {
    }.getType();
    navItems = gson.fromJson(json, type);
    if (navItems == null) {
        navItems = new ArrayList<>();
    }
}

private void deleteData(NavItem navItem) {
    SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREF_LIST_KEY, MODE_PRIVATE);
    Gson gson = new Gson();
    String json = sharedPreferences.getString(SHARED_PREF_LIST_KEY_ITEM, null);
    Type type = new TypeToken<ArrayList<NavItem>>() {
    }.getType();
    navItems = gson.fromJson(json, type);
    if (navItems != null) {
        navItems.remove(navItem);
        navViewArray.removeItem(navItem);

                    Toast.makeText(this, "List " + navItem.getName() + " 
                                      deleted ", Toast.LENGTH_SHORT).show();

        saveData(); // save updated data to shared preferences
    }
}




       int position = navViewArray.findItemString(checkItemTitle);
                            Toast.makeText(this, "position " + position, 
                                             Toast.LENGTH_SHORT).show();

           NavItem navItem = navItems.get(position);
            deleteData(navItem);



 public class NavItem {
       private String name;

       public NavItem(String name) {
        this.name = name;
    }

       public String getName() {
        return name;
    }
}

 public class NavViewArray {
   private List<NavItem> navItems;


       public void addItem(NavItem navItem) {
        navItems.add(navItem);
        navViewArray.addItem(new NavItem(listName));

    }

       public int findItemString(String itemName) {
        for (int i = 0; i < navItems.size(); i++) {
            NavItem navItem = navItems.get(i);
            if (itemName.equals(navItem.getName())) {
                return i;
            }
        }
        return -1;
    }

   public void removeItem(NavItem navItem){
    navItems.remove(navItem);
   }

}