在recyclerview

Question

我在cardview中有一个带有linearlayout和textviews的回收站视图。我想为我的项目实现onclick方法，我想在其中更改线性布局的背景颜色并反转textviews的textcolor。我有它的工作，但我面临的主要问题是，如果我选择第一项，那么第一项和第七项的颜色都会改变。

试着让这个工作从两天开始。任何帮助将不胜感激。

这是我的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Models.ViewModels;
using Android.App;
using Android.Content;
using Android.Graphics;
using Android.OS;
using Android.Runtime;
using Android.Support.V7.Widget;
using Android.Views;
using Android.Widget;

namespace A.Droid.Adapters
{
    public class DeliveryAdapter : RecyclerView.Adapter//, View.IOnClickListener
    {
        List<RequestViewModel> list;
        public Context v;
        public event EventHandler<int> phoneClick;

        List<RequestViewModel> selectedList = new List<RequestViewModel>();

        public DeliveryAdapter(List<RequestViewModel> records, Context v1)
        {
            list = records;
            v = v1;
        }
        public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType)
        {
            // Inflate the CardView for the photo:
            View itemView = LayoutInflater.From(parent.Context).Inflate(Resource.Layout.activity_cardview_slinkyRecordList, parent, false);

            DeliveryListViewHolder vh = new DeliveryListViewHolder(itemView, OnPhoneClick);
            return vh;
        }

        // Fill in the contents of the photo card (invoked by the layout manager):
        public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
        {
            DeliveryListViewHolder viewHolder = holder as DeliveryListViewHolder;
            viewHolder.PICNumber.Text = string.IsNullOrEmpty(list[position].PICNumber) ? "-" : list[position].PICNumber;
            viewHolder.PropertyName.Text = string.IsNullOrEmpty(list[position].PropertyName) ? "-" : list[position].PropertyName;
            viewHolder.ContactAddress.Text = string.IsNullOrEmpty(list[position].ContactAddress) ? "-" : list[position].ContactAddress;
            viewHolder.ContactPerson.Text = string.IsNullOrEmpty(list[position].ContactPerson) ? "-" : list[position].ContactPerson;
            viewHolder.ContactNumber.Text = string.IsNullOrEmpty(list[position].ContactNumber) ? "-" : list[position].ContactNumber;

            viewHolder.NumberOfAliveSpecies.Text = list[position].NumberOfAliveStock + " Alive " + list[position].NameOfSpecies;
            viewHolder.NumberOfDeadSpecies.Text = list[position].NumberOfDeadStock + " Dead " + list[position].NameOfSpecies;

            viewHolder.DistanceOfTransporterToPIC.Text = list[position].DistanceOfTransporterFromPIC.ToString() + " KM"; //DeliveryList[position].DistanceOfTransporterFromPIC.ToString();
                                                                                                                         //viewHolder.MainLinearLayout.SetOnClickListener((new OnClickListener(viewHolder.MainLinearLayout,position));                                                                         // cardViewList.Add(viewHolder.cardView); //add all the cards to this list
                                                                                                                         //viewHolder.MainLinearLayout.SetOnClickListener(this);                                                                        // cardViewList.Add(viewHolder.cardView); //add all the cards to this list

            viewHolder.cardView.Click += delegate (object sender, EventArgs e)
            {
                if (selectedList.All(i => i.slinkyStockRequestId != list[position].slinkyStockRequestId))
                {
                    selectedList.Add(list[position]);

                    viewHolder.MainLinearLayout.SetBackgroundColor(v.Resources.GetColor(Resource.Color.white));

                    viewHolder.PICNumber.SetTextColor(v.Resources.GetColor(Resource.Color.dark_blue));
                    viewHolder.PropertyName.SetTextColor(v.Resources.GetColor(Resource.Color.dark_blue));
                    viewHolder.ContactAddress.SetTextColor(v.Resources.GetColor(Resource.Color.dark_blue));
                    viewHolder.ContactPerson.SetTextColor(v.Resources.GetColor(Resource.Color.dark_blue));
                    viewHolder.ContactNumber.SetTextColor(v.Resources.GetColor(Resource.Color.dark_blue));

                    viewHolder.NumberOfAliveSpecies.SetTextColor(v.Resources.GetColor(Resource.Color.dark_blue));
                    viewHolder.NumberOfDeadSpecies.SetTextColor(v.Resources.GetColor(Resource.Color.dark_blue));

                    viewHolder.DistanceOfTransporterToPIC.SetTextColor(v.Resources.GetColor(Resource.Color.dark_blue));
                    viewHolder.mapIcon.SetColorFilter(v.Resources.GetColor(Resource.Color.dark_blue), PorterDuff.Mode.SrcAtop);
                    viewHolder.contactIcon.SetColorFilter(v.Resources.GetColor(Resource.Color.dark_blue), PorterDuff.Mode.SrcAtop);
                    viewHolder.phoneIcon.SetColorFilter(v.Resources.GetColor(Resource.Color.dark_blue), PorterDuff.Mode.SrcAtop);

                }
                else
                {
                    selectedList.Remove(list[position]);

                    viewHolder.MainLinearLayout.SetBackgroundColor(v.Resources.GetColor(Resource.Color.dark_blue));

                    viewHolder.PICNumber.SetTextColor(v.Resources.GetColor(Resource.Color.white));
                    viewHolder.PropertyName.SetTextColor(v.Resources.GetColor(Resource.Color.white));
                    viewHolder.ContactAddress.SetTextColor(v.Resources.GetColor(Resource.Color.white));
                    viewHolder.ContactPerson.SetTextColor(v.Resources.GetColor(Resource.Color.white));
                    viewHolder.ContactNumber.SetTextColor(v.Resources.GetColor(Resource.Color.white));

                    viewHolder.NumberOfAliveSpecies.SetTextColor(v.Resources.GetColor(Resource.Color.white));
                    viewHolder.NumberOfDeadSpecies.SetTextColor(v.Resources.GetColor(Resource.Color.white));

                    viewHolder.DistanceOfTransporterToPIC.SetTextColor(v.Resources.GetColor(Resource.Color.white));
                    viewHolder.mapIcon.SetColorFilter(v.Resources.GetColor(Resource.Color.white), PorterDuff.Mode.SrcAtop);
                    viewHolder.contactIcon.SetColorFilter(v.Resources.GetColor(Resource.Color.white), PorterDuff.Mode.SrcAtop);
                    viewHolder.phoneIcon.SetColorFilter(v.Resources.GetColor(Resource.Color.white), PorterDuff.Mode.SrcAtop);

                }
            };



            animate(holder);
        }


        public List<RequestViewModel> GetSelectedItems()
        {
            return selectedList;
        }


        // Return the number of photos available in the photo album:
        public override int ItemCount
        {
            get { return list.Count; }
        }


        // Raise an event when the phone-click takes place:
        void OnPhoneClick(int position)
        {
            if (phoneClick != null)
            {
                phoneClick(this, position);
            }
        }


        public class DeliveryListViewHolder : RecyclerView.ViewHolder
        {
            public ImageView MapTag { get; private set; }
            public TextView PICNumber { get; private set; }
            public TextView PropertyName { get; private set; }
            public TextView ContactAddress { get; private set; }
            public TextView ContactPerson { get; private set; }
            public TextView ContactNumber { get; private set; }
            public TextView NameOfSpecies { get; private set; }
            public TextView NumberOfAliveSpecies { get; private set; }
            public TextView NumberOfDeadSpecies { get; private set; }
            public TextView DistanceOfTransporterToPIC { get; private set; }
            public CardView cardView { get; private set; }
            public LinearLayout MainLinearLayout { get; private set; }
            public ImageView mapIcon { get; private set; }
            public ImageView contactIcon { get; private set; }
            public ImageView phoneIcon { get; private set; }
            // Get references to the views defined in the CardView layout.
            public DeliveryListViewHolder(View itemView, Action<int> phoneClickListener) : base(itemView)
            {
                MapTag = itemView.FindViewById<ImageView>(Resource.Id.mapIcon);
                PICNumber = itemView.FindViewById<TextView>(Resource.Id.PICNumber);
                PropertyName = itemView.FindViewById<TextView>(Resource.Id.nameOfProperty);
                ContactPerson = itemView.FindViewById<TextView>(Resource.Id.contactPerson);
                NumberOfAliveSpecies = itemView.FindViewById<TextView>(Resource.Id.noOfAliveSpecies);
                NumberOfDeadSpecies = itemView.FindViewById<TextView>(Resource.Id.noOfDeadSpecies);
                DistanceOfTransporterToPIC = itemView.FindViewById<TextView>(Resource.Id.areaInKM);
                ContactAddress = itemView.FindViewById<TextView>(Resource.Id.address);
                ContactNumber = itemView.FindViewById<TextView>(Resource.Id.mobileNo);
                mapIcon = itemView.FindViewById<ImageView>(Resource.Id.mapIcon);
                contactIcon = itemView.FindViewById<ImageView>(Resource.Id.contactIcon);
                phoneIcon = itemView.FindViewById<ImageView>(Resource.Id.phoneIcon);

                cardView = itemView.FindViewById<CardView>(Resource.Id.mainCardviewLayout);
                MainLinearLayout = itemView.FindViewById<LinearLayout>(Resource.Id.MainLinearLayout);
                ContactNumber.Click += (sender, e) => phoneClickListener(base.Position);
            }
        }
    }


}

修改 从Deep Patel输入，这是我的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Models.ViewModels;
using Android.App;
using Android.Content;
using Android.Graphics;
using Android.OS;
using Android.Runtime;
using Android.Support.V7.Widget;
using Android.Views;
using Android.Widget;

namespace A.Droid.Adapters
{
    public class DeliveryAdapter : RecyclerView.Adapter//, View.IOnClickListener
    {
        List<RequestViewModel> list;
        public Context v;
        public event EventHandler<int> phoneClick;

        List<RequestViewModel> selectedList = new List<RequestViewModel>();

        public DeliveryAdapter(List<RequestViewModel> records, Context v1)
        {
            list = records;
            v = v1;
        }
        public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType)
        {
            // Inflate the CardView for the photo:
            View itemView = LayoutInflater.From(parent.Context).Inflate(Resource.Layout.activity_cardview_slinkyRecordList, parent, false);

            DeliveryListViewHolder vh = new DeliveryListViewHolder(itemView, OnPhoneClick);
            return vh;
        }

        public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
    {
        DeliveryListViewHolder viewHolder = holder as DeliveryListViewHolder;
        viewHolder.PICNumber.Text = string.IsNullOrEmpty(list[position].PICNumber) ? "-" : list[position].PICNumber;
        viewHolder.PropertyName.Text = string.IsNullOrEmpty(list[position].PropertyName) ? "-" : list[position].PropertyName;
        viewHolder.ContactAddress.Text = string.IsNullOrEmpty(list[position].ContactAddress) ? "-" : list[position].ContactAddress;
        viewHolder.ContactPerson.Text = string.IsNullOrEmpty(list[position].ContactPerson) ? "-" : list[position].ContactPerson;
        viewHolder.ContactNumber.Text = string.IsNullOrEmpty(list[position].ContactNumber) ? "-" : list[position].ContactNumber;

        viewHolder.NumberOfAliveSpecies.Text = list[position].NumberOfAliveStock + " Alive " + list[position].NameOfSpecies;
        viewHolder.NumberOfDeadSpecies.Text = list[position].NumberOfDeadStock + " Dead " + list[position].NameOfSpecies;

        viewHolder.DistanceOfTransporterToPIC.Text = list[position].DistanceOfTransporterFromPIC.ToString() + " KM"; //DeliveryList[position].DistanceOfTransporterFromPIC.ToString();
                                                                                                                     //viewHolder.MainLinearLayout.SetOnClickListener((new OnClickListener(viewHolder.MainLinearLayout,position));                                                                         // cardViewList.Add(viewHolder.cardView); //add all the cards to this list
                                                                                                                     //viewHolder.MainLinearLayout.SetOnClickListener(this);                                                                        // cardViewList.Add(viewHolder.cardView); //add all the cards to this list

        viewHolder.cardView.Click += delegate (object sender, EventArgs e)
        {

            setSelectedPosition(position);
        };

        viewHolder.MainLinearLayout.SetBackgroundColor(list[position].isSelected() ? v.Resources.GetColor(Resource.Color.white) : v.Resources.GetColor(Resource.Color.dark_blue));


        animate(holder);
    }

    private void setSelectedPosition(int position)
    {
        for (int i = 0; i < list.Count(); i++)
        {
            list[position].setSelected(i == position);
        }
        NotifyDataSetChanged();
    }

        public List<RequestViewModel> GetSelectedItems()
        {
            return selectedList;
        }


        // Return the number of photos available in the photo album:
        public override int ItemCount
        {
            get { return list.Count; }
        }


        // Raise an event when the phone-click takes place:
        void OnPhoneClick(int position)
        {
            if (phoneClick != null)
            {
                phoneClick(this, position);
            }
        }


        public class DeliveryListViewHolder : RecyclerView.ViewHolder
        {
            public ImageView MapTag { get; private set; }
            public TextView PICNumber { get; private set; }
            public TextView PropertyName { get; private set; }
            public TextView ContactAddress { get; private set; }
            public TextView ContactPerson { get; private set; }
            public TextView ContactNumber { get; private set; }
            public TextView NameOfSpecies { get; private set; }
            public TextView NumberOfAliveSpecies { get; private set; }
            public TextView NumberOfDeadSpecies { get; private set; }
            public TextView DistanceOfTransporterToPIC { get; private set; }
            public CardView cardView { get; private set; }
            public LinearLayout MainLinearLayout { get; private set; }
            public ImageView mapIcon { get; private set; }
            public ImageView contactIcon { get; private set; }
            public ImageView phoneIcon { get; private set; }
            // Get references to the views defined in the CardView layout.
            public DeliveryListViewHolder(View itemView, Action<int> phoneClickListener) : base(itemView)
            {
                MapTag = itemView.FindViewById<ImageView>(Resource.Id.mapIcon);
                PICNumber = itemView.FindViewById<TextView>(Resource.Id.PICNumber);
                PropertyName = itemView.FindViewById<TextView>(Resource.Id.nameOfProperty);
                ContactPerson = itemView.FindViewById<TextView>(Resource.Id.contactPerson);
                NumberOfAliveSpecies = itemView.FindViewById<TextView>(Resource.Id.noOfAliveSpecies);
                NumberOfDeadSpecies = itemView.FindViewById<TextView>(Resource.Id.noOfDeadSpecies);
                DistanceOfTransporterToPIC = itemView.FindViewById<TextView>(Resource.Id.areaInKM);
                ContactAddress = itemView.FindViewById<TextView>(Resource.Id.address);
                ContactNumber = itemView.FindViewById<TextView>(Resource.Id.mobileNo);
                mapIcon = itemView.FindViewById<ImageView>(Resource.Id.mapIcon);
                contactIcon = itemView.FindViewById<ImageView>(Resource.Id.contactIcon);
                phoneIcon = itemView.FindViewById<ImageView>(Resource.Id.phoneIcon);

                cardView = itemView.FindViewById<CardView>(Resource.Id.mainCardviewLayout);
                MainLinearLayout = itemView.FindViewById<LinearLayout>(Resource.Id.MainLinearLayout);
                ContactNumber.Click += (sender, e) => phoneClickListener(base.Position);
            }
        }
    }


}

Answer 1

  

在您的模型中，   获取布尔变量，并创建getter setter方法

private boolean isSelected = false

    public boolean isSelected() {
        return isSelected;
    }

    public void setSelected(boolean selected) {
        isSelected = selected;
    }

  您OnBindViewHolder

中的

viewHolder.MainLinearLayout.SetBackgroundColor(list[position].isSelected()?v.Resources.GetColor(Resource.Color.white):v.Resources.GetColor(Resource.Color.black));

  在onClick事件中

， //编辑以下代码

注意：对于最佳做法setTag(position)，您的视图位置会被点击并将该标记值用作位置。

int pos = (int) view.getTag(); 
list[pos].setSelected(!list[pos].isSelected());
                        notifyItemChanged(position);

Answer 2

您需要在OnBindViewHolder()重置视图的背景颜色，因为这里会重复使用视图

在OnBindViewHolder(RecyclerView.ViewHolder holder, int position)

上添加这些行

if (selectedList.All(i => i.slinkyStockRequestId != list[position].slinkyStockRequestId)) 
viewHolder.MainLinearLayout.SetBackgroundColor(v.Resources.GetColor(Resource.C olor.white));
else 
viewHolder.MainLinearLayout.SetBackgroundColor(v.Resources.GetColor(Resource.Color.dark_blue));