Question

我从服务器获取数据，然后解析它并将其存储在List中。我正在将此列表用于RecyclerView的适配器。我正在使用碎片。

我延长了

RecyclerView.Adapter<RecyclerView.ViewHolder>

这是我的完整适配器类

public class GridAdapter extends RecyclerView.Adapter<GridAdapter.ViewHolder> {
    private List<ProductModel> list;
    ItemClickListener itemClickListener;

    public GridAdapter(List<ProductModel> list, ItemClickListener itemClickListener) {
        this.list              = list;
        this.itemClickListener = itemClickListener;
    }

    public void update(int position,ProductModel pm){
        Log.v("update adapter",position+"");
        list.set(position,pm); 
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.grid_item, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {
        final ProductModel cp = list.get(position);

        holder.tvName.setText(cp.name);
        holder.tvPrice.setText(cp.price);
        holder.ratingBar.setRating(cp.rate);

        Log.v("grid",cp.id + "=="+ cp.checked);
        if(cp.checked==1){
            holder.imgCheck.setVisibility(View.VISIBLE);
        }else{
            holder.imgCheck.setVisibility(View.GONE);
        }

        LayerDrawable stars = (LayerDrawable) holder.ratingBar.getProgressDrawable();
        stars.getDrawable(2).setColorFilter(Color.YELLOW, PorterDuff.Mode.SRC_ATOP);

        holder.lnrItem.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                itemClickListener.onItemClick(cp,position);
            }
        });
    }

    @Override
    public int getItemCount() {
        return list.size();
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        TextView tvName, tvPrice;
        ImageView imgMenu, imgCheck;
        LinearLayout lnrItem;
        RatingBar ratingBar;

        public ViewHolder(View itemView) {
            super(itemView);
            lnrItem = itemView.findViewById(R.id.lnrItem);
            imgMenu = itemView.findViewById(R.id.imgMenu);
            imgCheck = itemView.findViewById(R.id.imgCheck);
            tvName = itemView.findViewById(R.id.tvName);
            ratingBar = itemView.findViewById(R.id.ratingBar);
            tvPrice = itemView.findViewById(R.id.tvPrice);
        }
    }
}

在片段活动中，我使用此代码将适配器加载到recyclerview

public void fillListProduct(List<ProductModel> mItems) { //method for load adapter for the first time
        mAdapterGrid = new GridAdapter(mItems,this);
        recGrid.setAdapter(mAdapterGrid);
    }

void update(){ //method to change checked value
mAdapterGrid.update(cp.row,cp);
                        mAdapterGrid.notifyDataSetChanged();
}

在我的自定义适配器中我有3个变量可以调用 id，name，checked ，一切正常，在第一次加载时我将 0 设置为{{1的默认值在我的场景中，用户可以通过点击recycleview行来更改checked值。

我的问题是，当用户点击欲望行时，然后选中将从0更改为1并将其显示到recycelview，我已经使用checked但不能正常工作。

请帮忙。谢谢

Answer 1

尝试删除mAdapterGrid.notifyDataSetChanged(); 并在您的adpater中修改此功能：

 public void update(int position,ProductModel pm){
        Log.v("update adapter",position+"");
        list.set(position,pm);
        notifyItemChanged(position);
    }

适配器更改时，notifyDataSetChanged无法正常工作

1 个答案: