RecyclerView onBindViewHolder单击侦听器更改错误单元格的内容

时间:2017-07-16 18:04:12

标签: android android-recyclerview android-viewholder

我从食物项目列表中获得了Recyclerview。当您单击该项目时,我希望该项目显示为灰色。现在这确实有效,而我按下的第一个项目确实变灰了。然而,当我再次按下它时,其他一些细胞变成灰色。然后它变成了一个大混乱,随机的灰色变成灰色?

我已经设置了当你单击该项时,FoodItem实例有一个布尔值集。然后我刷新了recyclerview的数据,因此具有布尔值集的项目具有灰色覆盖。

这是我的适配器:

[

public class FoodAdapter extends RecyclerView.Adapter<FoodAdapter.MyViewHolder> {

    ClickListener clickListener;

    private List<FoodItem> foodList;

    public void setClickListener(ClickListener clickListener) {
        this.clickListener = clickListener;
    }

    public interface ClickListener {
        void ItemClicked(View v, int position);
    }



    public class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView name;
        public TextView quantity;
        public RelativeLayout background;
        public LinearLayout eatenOverlay;

        public MyViewHolder(View view) {
            super(view);
            name = (TextView) view.findViewById(R.id.textView_item_name);
            quantity = (TextView) view.findViewById(R.id.textView_item_quantity);
            background = (RelativeLayout) view.findViewById(R.id.food_item_background_relative_layout);
            eatenOverlay = (LinearLayout) view.findViewById(R.id.eaten_overlay);
        }
    }

    public FoodAdapter(List<FoodItem> foodList) {
        this.foodList = foodList;
    }


    @Override
    public FoodAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.food_item_list, parent, false);



        return new MyViewHolder(itemView);

    }

    @Override
    public void onBindViewHolder(FoodAdapter.MyViewHolder holder, final int position) {

        FoodItem currentFoodItem = foodList.get(position);

        if(currentFoodItem.isHasBeenEaten()){
            holder.eatenOverlay.setVisibility(View.VISIBLE);
        }

        Resources res = holder.itemView.getContext().getResources();

        holder.name.setText(currentFoodItem.getName());
        holder.quantity.setText(currentFoodItem.getQuantity());

        holder.background.setBackgroundResource(currentFoodItem.getImage());

        holder.background.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (clickListener != null) {
                    clickListener.ItemClicked(v, position);
                }
            }
        });




    }

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

主要活动实现了界面,所以当点击项目时,在主要活动中我有这个代码;

 @Override
    public void ItemClicked(View v, int position) {

        foodList.get(position).setHasBeenEaten(true);
        Log.d(TAG,foodList.get(position).getName() + " clicked");
        Log.d(TAG,"position: " + position);
        mAdapter.notifyDataSetChanged();

    }

为什么会这样?感谢

1 个答案:

答案 0 :(得分:3)

你只是错过了另一种选择。

場所  バショ バショ 場所  名詞-普通名詞-一般      

需要一个else分支,否则由于回收,您可以重复使用之前的“配置”前一个视图。