Android RecyclerView only contain one item after adding items got from asynchronous retrofit calls-CodePudding

The

However, there is another adapter(id:24962) exists. For that adapter, the add item method only called once thus only one item in that adapter. When the recycler view changes the content, the onBindViewHolder is called on the second adapter. Now my question is, where does the second adapter come from ???

Here is my code to initialize recycler view and adapter

@Override public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { binding = PlaceFragmentBinding.inflate(getLayoutInflater()); RecyclerView recyclerView = binding.imageGallery; recyclerView.setHasFixedSize(true); ImageListAdapter adapter = new ImageListAdapter(new ArrayList<>()); recyclerView.setLayoutManager(new LinearLayoutManager(getContext(), LinearLayoutManager.HORIZONTAL, false)); recyclerView.setAdapter(adapter); return binding.getRoot(); }

CodePudding user response：

Hej AhSoHard,

did you check if it is a timing issue, because you are loading your data asynchronously and it could lead to missing updates.

also could it be that setItemsList(ArrayList<Bitmap> bmps) is called and overwrites the current list?

is there a reason why you do not use the viewGroup as a base for inflating the layout resource in onCreateViewHolder()?

LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.image_card, viewGroup, false)

in my opinion the Adapter should not be the holder of the current state, maybe have a list outside and use a ListAdapter to display it. When you have a new list of bitmaps, you just call adapter.submit(bitmaps) and the new list will be displayed. Together with a DiffCallback, the old items will not update and the new ones added at the end of the list.

CodePudding user response：

It's interesting that you initialize the adapter in onCreateView method and it has local visibility(only visible inside of the onCreateView method). But in the googleMapService.getImageByPhotoReference() method's callback you are referencing it adapter.addItem(bmp);. So my guess is that you are referencing the wrong adapter object in the googleMapService.getImageByPhotoReference() method's callback. The callback may reference an old instance of ImageListAdapter.

Try to initialize ImageListAdapter adapter as a property of your Fragment class and see if it works.