第一个列表消失在回收者视图中消失了

Question

I have a RecyclerView that shows different lists depending on which option I pick in my Spinner . I can add items to a list dynamically, but when I add items to the top option on the Spinner , two items appear everytime I add, when it is only supposed to add just one and when I choose a different option in the Spinner and then back to the top option, all items that are supposed to be in it are gone. However, when I repeat the same actions in another option, one item is added at a time, and they are still there if i switch to another and back, so it is only in the first option where I experience these problems.

Here are pictures that shows what happens. First picture shows the entire Spinner , second is the top option selected with items added, third is the second Spinner option selected and fourth is back to the top option and now the items are gone.

This method is used to add a Item to one of the lists. Each option in the Spinner is used to get an element in listOfLists where each element is an ArrayList<Item>() . mItemList is the list which the RecyclerView prints out.

  public void addItem(){
        mItemList.add(0, new Item(idText.getText().toString(), addAmountField.getText().toString()));
        listOfLists.get(dropdown.getSelectedItemPosition()).add(0, new Item(idText.getText().toString(), addAmountField.getText().toString()));
        System.out.println("ListSize: " + listOfLists.get(dropdown.getSelectedItemPosition()).size());

        addAmountField.setVisibility(View.GONE);
        btnAdd.setVisibility(View.GONE);
        mAdapter.notifyDataSetChanged();
        saveData2();
    }

This is the code for switching the lists when I choose another option from the Spinner . What I do here is that I clear the mItemList and then I fill it with one of the ArrayList<Item> inside listOfLists .

 dropdown.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
                mItemList.clear();

                for (int i = 0; i < listOfLists.get(position).size(); i++) {
                    mItemList.add(listOfLists.get(position).get(i));
                }


                mAdapter.notifyDataSetChanged();

            }

            @Override
            public void onNothingSelected(AdapterView<?> parentView) {
                // your code here
            }

        });

How can I resolve this so that the top option of the Spinner will work just like the other options where it adds one item at a time and still has the items after I switch to another option?

Answer 1

I managed to solve it so for anyone who faces similar problems this was the problem:

Unlike the other lists in listOfLists where I set mItemList to the chosen list like this

 mItemList.clear();

 for (int i = 0; i < listOfLists.get(position).size(); i++) {
      mItemList.add(listOfLists.get(position).get(i));
 }

mItemList is always set to the first list when I run the app like this

mItemList = listOfLists.get(dropDown.getSelectedItemPosition());

So I just changed it so it sets mItemList the same way it is done with the other lists and now it is working.