Question

动态添加项目，但没有给出我想要的输出，静态数据工作正常，但没有动态数据。视图有时会重复，有时会创建空视图。

片段服务电话：

public void getDataFromServer() {
        try {
            RequestParams params = new RequestParams();
            String url = ApplicationConstants.GET_ITEMS;

            if (networkClient!= null)
                networkClient.getData(url, params, new ItemsDataListener());

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    class ItemsDataListener extends ResponseHandler{

        @Override
        public void onSuccess(int statusCode, Header[] headers, byte[] byteResponse) {
            try {
                String response = new String(byteResponse);
                if (response != null && !response.isEmpty()) {                   
                    Model model=new Gson().fromJson(response,Model.class);
                    mAdapter.addItem(model, 2);

                } 
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onFailure(int statusCode, byte[] byteResponse) {

        }
    }

这是我的适配器中的方法：

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

    private Context context = null;
    private ArrayList<Model> itemList;


    public ItemCardAdapter(Context context) {
        super();
        this.context = context;
        this.activity = (Activity) context;
        itemList= new ArrayList<>();

    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, final int viewType) {

            View v = LayoutInflater.from(viewGroup.getContext())
                    .inflate(R.layout.single_item_view, viewGroup, false);
            ItemCardHolder itemCardHolder = new ItemCardHolder(v);

            return itemCardHolder ;
        }
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int i) {

         (holder instanceof ItemCardHolder) {
            Model model=itemList.get(i)
            ((ItemCardHolder) holder).populateData(model);
        }
    }

    @Override
    public int getItemCount() {

            return itemList.size();
    }

    @Override
    public void onViewDetachedFromWindow(RecyclerView.ViewHolder holder) {
        super.onViewDetachedFromWindow(holder);
            ((ItemCardHolder) holder).cardview.clearAnimation();
    }



     public void addItem(Model newItem, int position) {
            itemlist.add(position, newItem);
            this.notifyItemInserted(position);
            this.notifyItemChanged(position);

        }

    public void clearData() {
        itemList.clear();
        this.notifyDataSetChanged();
    }

}

Answer 1

你这里做错了

mAdapter.addItem(model, 2);

即使没有数据，也会尝试在2位置添加项目。尝试从适配器获取项目数，然后尝试添加项目。

Recycler视图在创建空视图的位置添加项目，而不是更新添加位置的数据

1 个答案: