我正在目睹RecyclerView的奇怪行为。所以我在ViewHolder上的Button设置了一个OnClickListener，当用户点击时，它会做3件事：
将当前项目的数据添加到ArrayList [显示在其他Fragment]上
向用户显示Toast。
View.INVISIBLE等的setVisibility ..] 现在，虽然OnClickListener的前两个任务已成功完成，并且仅将 应用于所选项目，但第三个任务是修改的用户界面仅选择项，而是也应用于RecyclerView上的每个第9项。
即以前的答案。我看到的特定主题，我认为最好在OnClickListener中插入ViewHolder，而不是将其放入onBindViewHolder，但这并没有解决问题。我已经关注了stackOverflow上的其他建议，但都失败了。
这是我的代码：
static class ItemsRecyclerAdapter extends RecyclerView.Adapter<ItemsRecyclerAdapter.ItemsViewHolder>{
FragmentActivity fragmentActivity;
List<ProductItem> data;
LayoutInflater inflater;
private int id;
private int shopCode;
public ItemsRecyclerAdapter(List<ProductItem> data, FragmentActivity fragmentActivity, int id, int shopCode) {
this.fragmentActivity = fragmentActivity;
this.data = data;
this.inflater = LayoutInflater.from(fragmentActivity);
this.id = id;
this.shopCode = shopCode;
}
@Override
public ItemsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = inflater.inflate(R.layout.pricing_item, parent, false);
return new ItemsViewHolder(v);
}
@Override
public void onBindViewHolder(final ItemsViewHolder holder, int position) {
ProductItem itemPrice = data.get(position);
holder.productName.setText(itemPrice.getProductName());
holder.quantity.setText(itemPrice.getProductQuantity());
holder.tvPrice.setText(itemPrice.getproductPrice());
Picasso.with(fragmentActivity).load(itemPrice.getThumbUrl()).into(holder.imgProduct);
}
@Override
public int getItemCount() {
return data.size();
}
class ItemsViewHolder extends RecyclerView.ViewHolder{
TextView productName, quantity, tvPrice;
ImageView imgProduct;
Button btnAddToBasket, btnAdd, btnRemove;
Typeface myCustomFont = Typeface.createFromAsset(fragmentActivity.getAssets(), "fonts/Assistant-SemiBold.ttf");
public ItemsViewHolder(View itemView) {
super(itemView);
productName = (TextView) itemView.findViewById(R.id.productName);
quantity = (TextView) itemView.findViewById(R.id.manufacturer);
tvPrice = (TextView) itemView.findViewById(R.id.tvPrice);
imgProduct = (ImageView) itemView.findViewById(R.id.imgProduct);
btnAddToBasket = (Button) itemView.findViewById(R.id.btnAddToBasket);
btnAdd = itemView.findViewById(R.id.btnAdd);
btnRemove = itemView.findViewById(R.id.btnRemove);
btnAdd.setVisibility(View.INVISIBLE);
btnRemove.setVisibility(View.INVISIBLE);
quantity.setTypeface(myCustomFont);
productName.setTypeface(myCustomFont);
tvPrice.setTypeface(myCustomFont);
Typeface fontAwesomeBasketIcon = Typeface.createFromAsset(fragmentActivity.getAssets(), "fontawesome-webfont.ttf");
btnAddToBasket.setTypeface(fontAwesomeBasketIcon);
btnAdd.setTypeface(fontAwesomeBasketIcon);
btnRemove.setTypeface(fontAwesomeBasketIcon);
btnAddToBasket.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int pos = getAdapterPosition();
MyBasketFragment.myBasketList
.add(new ProductItem(data.get(pos).getProductName(), data.get(pos).getProductQuantity(),
data.get(pos).getproductPrice(), data.get(pos).getThumbUrl(), id, shopCode));
btnAddToBasket.setOnClickListener(null);
Toast.makeText(fragmentActivity, "New product..", Toast.LENGTH_SHORT).show();
btnAdd.setVisibility(View.VISIBLE);
btnRemove.setVisibility(View.VISIBLE);
}
});
btnAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ItemsFragment.atomic.incrementAndGet();
btnAddToBasket.setText(String.valueOf(atomic.get()));
}
});
}
}
}
答案 0 :(得分：2)
在项目的每次单击时，我将实例化对象中的布尔值指定为true，然后运行notifyDataSetChanged()。使用boolean为真的数据对象更新所有项目。这样我就可以确保仅所选对象将被更新。
它看起来像这样：
ViewHolder
class ItemsViewHolder extends RecyclerView.ViewHolder {
TextView productName, quantity, tvPrice;
ImageView imgProduct;
Button btnAddToBasket, btnAdd, btnRemove;
Typeface myCustomFont = Typeface.createFromAsset(fragmentActivity.getAssets(), "fonts/Assistant-SemiBold.ttf");
public ItemsViewHolder(View itemView) {
super(itemView);
productName = (TextView) itemView.findViewById(R.id.productName);
quantity = (TextView) itemView.findViewById(R.id.manufacturer);
tvPrice = (TextView) itemView.findViewById(R.id.tvPrice);
imgProduct = (ImageView) itemView.findViewById(R.id.imgProduct);
btnAddToBasket = (Button) itemView.findViewById(R.id.btnAddToBasket);
btnAdd = itemView.findViewById(R.id.btnAdd);
btnRemove = itemView.findViewById(R.id.btnRemove);
btnAdd.setVisibility(View.INVISIBLE);
btnRemove.setVisibility(View.INVISIBLE);
quantity.setTypeface(myCustomFont);
productName.setTypeface(myCustomFont);
tvPrice.setTypeface(myCustomFont);
Typeface fontAwesomeBasketIcon = Typeface.createFromAsset(fragmentActivity.getAssets(), "fontawesome-webfont.ttf");
btnAddToBasket.setTypeface(fontAwesomeBasketIcon);
btnAdd.setTypeface(fontAwesomeBasketIcon);
btnRemove.setTypeface(fontAwesomeBasketIcon);
}
public void bind(final ProductItem item) {
btnAddToBasket.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
item.clicked = true;
item.atomic.incrementAndGet();
Toast.makeText(fragmentActivity, "New product..", Toast.LENGTH_SHORT).show();
notifyDataSetChanged();
MyBasketFragment.myBasketList
.add(new ProductItem(item.getProductName(), item.getProductQuantity(),
item.getproductPrice(), item.getThumbUrl(), id, shopCode));
}
});
btnAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ItemsFragment.atomic.incrementAndGet();
btnAddToBasket.setText(String.valueOf(atomic.get()));
}
});
}
}
<强> onBindViewHolder
@Override
public void onBindViewHolder(final ItemsViewHolder holder, final int position) {
ProductItem itemPrice = data.get(position);
holder.productName.setText(itemPrice.getProductName());
holder.quantity.setText(itemPrice.getProductQuantity());
holder.tvPrice.setText(itemPrice.getproductPrice());
Picasso.with(fragmentActivity).load(itemPrice.getThumbUrl()).into(holder.imgProduct);
holder.bind(itemPrice);
if(itemPrice.clicked){
holder.btnAddToBasket.setOnClickListener(null);
holder.btnAddToBasket.setText(String.valueOf(atomic.get()));
holder.btnAdd.setVisibility(View.VISIBLE);
holder.btnRemove.setVisibility(View.VISIBLE);
} else {
holder.btnAddToBasket.setText("\uf291");
holder.btnAdd.setVisibility(View.INVISIBLE);
holder.btnRemove.setVisibility(View.INVISIBLE);
}
}
答案 1 :(得分：0)
我认为getAdapterPosition()导致问题。请尝试在视图中创建新的int属性position，onBindViewHolder将位置传递给视图所有者holder.position = position，并在视图中使用该位置，因此将{{1}而不是int pos = position