RecycleView中的位置变化，为什么？

Question

我有5列从零到无穷大的GridLayout。 如果数字是质数，我只想在GridLayoutManager / RecycleView中绘制一个正方形，如果此加载工作正常，但是如果我又绘制非质数，那为什么呢？我该如何解决？

下面的代码段很长，因此我事先表示歉意。

public class MainActivity extends AppCompatActivity {


 int numberOfColumns = 5;
 AdapterMyRecyclerView adapterMyRecyclerView;


 int currentItems, totalItems, scrollOutItems;
 Boolean isScrolling = false;
 GridLayoutManager manager;
 ProgressBar progressBar;



 ArrayList list;


 final String data[] = {
  "0",
  "1",
  "2",
  "3",
  "4",
  "5",
  "6",
  "7",
  "8",
  "9",
  "10",
  "11",
  "12",
  "13",
  "14",
  "15",
  "16",
  "17",
  "18",
  "19",
  "20",
  "21",
  "22",
  "23",
  "24",
  "25",
  "26",
  "27",
  "28",
  "29",
  "30",
  "31",
  "32",
  "33",
  "34",
  "35",
  "36",
  "37",
  "38",
  "39",
  "40",
  "41",
  "42",
  "43",
  "44",
  "45",
  "46",
  "47",
  "48",
  "49"
 };


 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  list = new ArrayList(Arrays.asList(data));

  manager = new GridLayoutManager(this, numberOfColumns);

  RecyclerView recyclerView = findViewById(R.id.rvNumbers);
  progressBar = (ProgressBar) findViewById(R.id.progress);

  recyclerView.setLayoutManager(new GridLayoutManager(this, numberOfColumns));
  adapterMyRecyclerView = new AdapterMyRecyclerView(this, list);

  recyclerView.setAdapter(adapterMyRecyclerView);
  recyclerView.setLayoutManager(manager);






  recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
   @Override
   public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
    super.onScrollStateChanged(recyclerView, newState);
    if (newState == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {
     isScrolling = true;
    }
   }


   @Override
   public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    super.onScrolled(recyclerView, dx, dy);

    currentItems = manager.getChildCount();
    totalItems = manager.getItemCount();
    scrollOutItems = manager.findFirstCompletelyVisibleItemPosition();



    if ((isScrolling) && (currentItems + scrollOutItems == totalItems)) {

     isScrolling = false;

     fitchData(list.size());

    }
   }
  });

  //Toast.makeText(MainActivity.this, "size =  " + list.size(), Toast.LENGTH_SHORT).show();

 }


 private void fitchData(final int size) {
  progressBar.setVisibility(View.VISIBLE);
  new Handler().postDelayed(new Runnable() {

   @Override
   public void run() {
    for (int i = size; i < size + 25; i++) {
     list.add(i + "");
     adapterMyRecyclerView.notifyDataSetChanged();
     progressBar.setVisibility(View.GONE);
    }


   }
  }, 5000);
 }



}



public class AdapterMyRecyclerView extends RecyclerView.Adapter < AdapterMyRecyclerView.ViewHolder > {

 public static Integer longNumber;
 public static Boolean isLongNum = false;


 //private String[] mData;
 private LayoutInflater mInflater;


 //progress
 ArrayList < String > dataProgressBar;
 Context context;




 AdapterMyRecyclerView(Context context, ArrayList < String > dataProgressBar) {
  this.mInflater = LayoutInflater.from(context);
  this.dataProgressBar = dataProgressBar;
 }


 @NonNull
 @Override
 public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) 
{

  View view = mInflater.inflate(R.layout.recyclerview_item, parent, false);

  return new ViewHolder(view);

 }

 @Override
 public void onBindViewHolder(@NonNull final ViewHolder holder, final int position) {
  holder.myTextView.setText(dataProgressBar.get(holder.getAdapterPosition()));

  holder.itemView.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    context = v.getContext();
    //Toast.makeText(context, "clicked at " + dataProgressBar.get(position), Toast.LENGTH_SHORT).show();
    //Toast.makeText(context, "sizeData = " + dataProgressBar.size(), Toast.LENGTH_SHORT).show();
    //Toast.makeText(context, "position = " + position, Toast.LENGTH_SHORT).show();
    //Toast.makeText(context, "holder.getAdapterPosition() = " + dataProgressBar.get(holder.getLayoutPosition()), Toast.LENGTH_SHORT).show();
    //Toast.makeText(context, "LongNumber = " + longNumber, Toast.LENGTH_SHORT).show();
   }

  });

  holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
   @Override
   public boolean onLongClick(View v) {
    context = v.getContext();
    longNumber = Integer.parseInt(dataProgressBar.get(position));
    isLongNum = true;
    getLongNumber(longNumber);
    Toast.makeText(context, "Long clicked at " + dataProgressBar.get(position), Toast.LENGTH_SHORT).show();
    //Toast.makeText(context, "LongNumber = " + longNumber, Toast.LENGTH_SHORT).show();
    holder.myTextView.setBackgroundColor(Color.BLUE);


    /*for (int i=0 ; i<dataProgressBar.size(); i++){
        Toast.makeText(context, "i = " + i, Toast.LENGTH_SHORT).show();
        if(i % longNumber == 0){
            //longNumber = Integer.parseInt(dataProgressBar.get(position));
            //isLongNum=true;
            holder.myTextView.setBackgroundColor(Color.YELLOW);
        }
    }*/
    return false;
   }
  });






  if (isPrime(position)) {
   holder.myTextView.setBackgroundColor(Color.RED);
   if (position == 0 || position == 1) {
    holder.myTextView.setBackgroundColor(Color.WHITE);
   }
  }


  //End onBindViewHolder()
 }


 //checks whether an int is prime or not.
 boolean isPrime(int n) {
  for (int i = 2; i < n; i++) {
   if (n % i == 0)
    return false;
  }
  return true;
 }

 @Override
 public int getItemCount() {

  return dataProgressBar.size();
 }

 public void getLongNumber(int x) {
  longNumber = x;
 }



 public class ViewHolder extends RecyclerView.ViewHolder {

  TextView myTextView;

  public ViewHolder(View itemView) {
   super(itemView);
   myTextView = itemView.findViewById(R.id.info_text);

  }
 }

}