如何使用寻呼机适配器中的if else更改字符串数组

Question

我正在尝试使用寻呼机适配器中的else来更改字符串数组项，但是每当我启动我的应用程序时，它都会给出异常。它给出了此错误The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged! Expected adapter item count.

这是我的代码

   @Override
    public Object instantiateItem(ViewGroup container, int position)
    {
        if (getIntent().getStringExtra("love")!=null)
        {
                    icons=getResources().getStringArray(R.array.love);
        }

  else if (getIntent().getStringExtra("sad")!=null)
        {
                    icons=getResources().getStringArray(R.array.sad);
        }

        Context context=Love.this;
        mLayoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View itemView = mLayoutInflater.inflate(R.layout.imagew, container, false);
        ImageView imageView = itemView.findViewById(R.id.imageview);
         random = new Random();
prevInts = new ArrayList<>();
        Picasso.get().load(icons[randomUniqueInteger()]).placeholder(R.drawable.loading).error(R.drawable.loading).into(imageView);

        container.addView(itemView);
        return itemView;
    }