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我正在使用 PagerSlidingTabStrip 来创建选项卡，并且在每个选项卡中我必须Recyclerview填充相关的选项卡项目。例如，我们有 3 个名称为 Toyota 、 Benz 和 Ford 的选项卡和一个显示所有项目的选项卡，因此在 Toyota 选项卡中我们有它的车辆等等。Recyclerview项目有一个添加到购物车和从购物车中删除的按钮，以及一个Textview显示订单数量的按钮。Textview删除按钮默认隐藏，当用户将项目添加到购物车时，删除按钮和Textview可见性将为 true。问题是，如果用户将商品添加到购物车，则删除按钮和Textview相关商品在所有选项卡中不可见？！但是在所有选项卡中，当用户将项目添加到购物车时，它会反映到相关选项卡中的项目。我认为问题是适配器Recylerview，它保持视图而不刷新所有项目的选项卡，也许。我使用NotifyDataSetChanged适配器Recyclerview但不起作用。

button添加到购物车和删除：单击可见Textview和减量按钮时的mDecremtBtn 和 mIncrementBtn。

mDcrementBtn.Click += delegate
                    {

                        if (orderList.Count == 0)
                        {
                            quntitySum = 0;
                        }

                        //Find order and decrement
                        var orderItem = orderList.Find(p => p.FoodId == foodId);
                        orderItem.Quantity--;
                        _quantitiyTxt.Text = orderItem.Quantity.ToString();

                        if (orderItem.Quantity == 0)
                        {
                            mDcrementBtn.Visibility = ViewStates.Invisible;
                            _quantitiyTxt.Visibility = ViewStates.Invisible;
                            _quantitiyTxt.Text = "";
                            orderList.Remove(orderItem);
                        }
                        if (orderList.Count == 0)
                        {
                            _fabCart.Visibility = ViewStates.Gone;

                            //Update bageNotification On bottomNavigation Cart when no items in orderlist
                            _badgeNotification.Text = "";
                            _badgeNotification.Visibility = ViewStates.Gone;
                        }
                        _fabCart.SetImageBitmap(ConvertTextToBitmap.TextAsBitmap((--quntitySum).ToString(), 36,
                           Color.White));

                        //Update bageNotification On bottomNavigation Cart
                        _badgeNotification.Text = quntitySum.ToString();
                        _adpter.NotifyDataSetChanged();

                    };

                    mIncrementBtn.Click += delegate
                    {
                        if (orderList.Count == 0)
                        {
                            quntitySum = 0;
                        }
                        _fabCart.Show();
                        mDcrementBtn.Visibility = ViewStates.Visible;
                        _quantitiyTxt.Visibility = ViewStates.Visible;
                        if (orderList.Any(p => p.FoodId == foodId))
                        {
                            //Find order and increment
                            var orderItem = orderList.Find(p => p.FoodId == foodId);

                            orderItem.Quantity++;
                            _quantitiyTxt.Text = orderItem.Quantity.ToString();
                        }
                        else
                        {
                            orDetail = new Order
                            {
                                FoodId = foodId,
                                FoodName = mFoodNameTxt.Text,
                                Price = Convert.ToInt32(mPriceTxt.Text),
                                ClickFlag = true
                            };

                            orDetail.Quantity++;
                            orderList.Add(orDetail);
                            _quantitiyTxt.Text = orDetail.Quantity.ToString();
                        }

                        _fabCart.SetImageBitmap(ConvertTextToBitmap.TextAsBitmap((++quntitySum).ToString(), 36,
                            Color.White));

                        //Update bageNotification On bottomNavigation Cart
                        _badgeNotification.Visibility = ViewStates.Visible;
                        _badgeNotification.Text = quntitySum.ToString();

                        _adpter.NotifyDataSetChanged();

                    };

在 SimpleStringRecyclerViewAdapter 类的 OnbindeViewHolder 中： RecyclerView.Adapter 项目已更新。

public override  void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
                {
                    var simpleHolder = holder as SimpleViewHolder;    

                    simpleHolder.mFoodNameTxt.Text = _foodItems[position].FoodName;
                    simpleHolder.mPriceTxt.Text = _foodItems[position].Price.ToString();
                    simpleHolder.foodId = _foodItems[position].Id;   

                    var item = orderList.Find(p => p.FoodId == _foodItems[position].Id);
                    if (item != null && item.ClickFlag)
                    {
                        simpleHolder.mDcrementBtn.Visibility = ViewStates.Visible;
                        simpleHolder._quantitiyTxt.Visibility = ViewStates.Visible;
                        simpleHolder._quantitiyTxt.Text = item.Quantity.ToString();

                    }
                    else
                    {
                        simpleHolder.mDcrementBtn.Visibility = ViewStates.Invisible;
                        simpleHolder._quantitiyTxt.Visibility = ViewStates.Invisible;
                        simpleHolder._quantitiyTxt.Text = "";
                    }

                }

它在 Imagenary 中的情景： 在此处输入图像描述

完成https://forums.xamarin.com/discussion/120389/recycleviewer-adapter-notifydatasetchanged-not-work/p1?new=1中的代码

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