我遇到ListView和RecyclerView
最初，我创建了一个ListView，一切都很好。然后我为它设置了onClick事件，这样每次点击一个项目时，它都会将颜色变为黄色。我在OnClick中写的MainActivity函数。问题是，当我测试时，不仅该项目改变了颜色而且改变了2个项目。我读到这是因为我重用了视图。
所以我改用我的策略，使用RecyclerView代替，但同样的问题发生。当我单击一个项目以更改其颜色时，下面的另一个项目也会更改。我想这是因为ListView和RecyclerView重用这些项目，所以当我点击一个项目时它们就会混淆。
我不知道如何解决这个问题，我发现一个解决方案是添加一个boolean数组，它标记了哪个项被点击但是不起作用。任何想法的人？
所以这是代码 MainActivity
class MainActivity : Activity
{
public RecyclerView recyclerView;
public RecyclerView.LayoutManager manager;
public RecyclerView.Adapter adapter;
List<Row> lst;
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Main);
init();
recyclerView = (RecyclerView)FindViewById(Resource.Id.recyclerView);
manager = new LinearLayoutManager(this);
recyclerView.SetLayoutManager(manager);
CustomAdapter adapter = new CustomAdapter(lst, this);
adapter.ItemClick += onItemClick;
recyclerView.SetAdapter(adapter);
}
public void init()
{
lst = new List<Row>();
for (int i = 0; i < 15; i++)
{
Row row = new Row() { field1="1:43:00", field2="09-Apr-16", field3="KPI/Overflow", field4="Kevin Bacon", field5="Unowned", field6= "People Counting @ IPCAM-ID-C-1-1" };
lst.Add(row);
}
}
public void onItemClick(object sender, int position)
{
int itemPos = position + 1;
//Toast.MakeText(this, "this is " + itemPos, ToastLength.Short).Show();
recyclerView.GetChildAt(position).SetBackgroundColor(Android.Graphics.Color.Green);
}
}
自定义适配器
public class CustomAdapter : RecyclerView.Adapter
{
public Activity _activity;
public List<Row> lst;
public event EventHandler<int> ItemClick;
public CustomAdapter(List<Row> lst, Activity activity)
{
this.lst = lst;
this._activity = activity;
}
public override int ItemCount
{
get
{
return lst.Count;
}
}
public void OnClick(int position)
{
if (ItemClick!=null)
{
ItemClick(this, position);
}
}
public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
MyViewHolder myholder = holder as MyViewHolder;
myholder.textView1.Text = lst[position].field1;
myholder.textView2.Text = lst[position].field2;
myholder.textView3.Text = lst[position].field3;
myholder.textView4.Text = lst[position].field4;
myholder.textView5.Text = lst[position].field5;
myholder.textView6.Text = lst[position].field6;
}
public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType)
{
View v = this._activity.LayoutInflater.Inflate(Resource.Layout.item, parent, false);
TextView tv1 = (TextView)v.FindViewById(Resource.Id.textView1);
TextView tv2 = (TextView)v.FindViewById(Resource.Id.textView2);
TextView tv3 = (TextView)v.FindViewById(Resource.Id.textView3);
TextView tv4 = (TextView)v.FindViewById(Resource.Id.textView4);
TextView tv5 = (TextView)v.FindViewById(Resource.Id.textView5);
TextView tv6 = (TextView)v.FindViewById(Resource.Id.textView6);
MyViewHolder holder = new MyViewHolder(v, OnClick) { textView1 = tv1, textView2 = tv2, textView3 = tv3, textView4 = tv4, textView5 = tv5, textView6 = tv6 };
return holder;
}
}
class MyViewHolder : RecyclerView.ViewHolder
{
public TextView textView1, textView2, textView3, textView4, textView5, textView6;
public View mainView;
public MyViewHolder(View view, Action<int> listener) : base(view)
{
mainView = view;
mainView.Click += (sender, e) => listener(base.Position);
}
}
我按照OnClic Xamarin site k处理程序的示例进行操作
https://developer.xamarin.com/guides/android/user_interface/recyclerview/
答案 0 :(得分：2)
您的问题与您的代码有关。您将正确的位置发送到事件处理程序，然后在Activity中将其递增1。两端应该使用项目位置的从0开始的索引。没有必要增加一个。
要更改所选项目的背景颜色，您可以使用XML格式的选择器，这样您甚至不需要在代码中执行此操作。
这是一个例子。
row_selector.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true" android:color="@android:color/green" />
<item android:state_selected="false" android:color="@android:color/transparent"/>
</selector>
row_content.axml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/row_layout_parent"
android:background="@drawable/row_selector">
<!-- your row content -->
</LinearLayout>
然后您的观看者将更新为此...
class MyViewHolder : RecyclerView.ViewHolder
{
public TextView textView1, textView2, textView3, textView4, textView5, textView6;
public View mainView;
private LinearLayout _layoutParent;
public MyViewHolder(View view, Action<int> listener) : base(view)
{
mainView = view;
_layoutParent = mainView.FindViewById<LinearLayout>(Resource.Id.row_layout_parent);
_layoutParent.Click += (sender, e) => _layoutParent.Selected = true;
}
}
我删除了其他点击事件。如果由于其他原因仍然需要它，那么您可以将其添加回来，但是在选择时仅设置项目背景颜色不是必需的。
答案 1 :(得分：0)
对于Listview，您应该将choiceMode设置如下。
listView.ChoiceMode = ChoiceMode.Single;
希望它可以帮助你:) -
答案 2 :(得分：0)
创建一个可重复使用的 recycleview 适配器 GENERIC
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using Android.App;
using Android.Content;
using Android.Graphics;
using Android.OS;
using Android.Runtime;
using Android.Support.V7.App;
using Android.Support.V7.Widget;
using Android.Text;
using Android.Text.Style;
using Android.Util;
using Android.Views;
using Android.Widget;
using Java.Util.Zip;
using ActionMenuView = Android.Support.V7.Widget.ActionMenuView;
namespace Android.Basic.Core
{
public class GenericRecyclerViewAdapter<T> : RecyclerView.Adapter
{
/// <summary>
/// You can set this for different custom cardview
/// </summary>
private int CardViewResourceLayout { get; set; }
public ObservableCollection<T> Items { get; private set; }
public event EventHandler<RecyclerViewViewHolder> ItemViewTemplated;
public RecyclerView.LayoutManager layoutManager;
public GenericRecyclerViewAdapter(RecyclerView recyclerView, IEnumerable<T> items, int cardViewResourceLayout, bool isList = true, bool isVertical = true) : base()
{
if(isList)
{
var vertical = isVertical ? LinearLayoutManager.Vertical : LinearLayoutManager.Horizontal;
layoutManager = new LinearLayoutManager(recyclerView.Context, vertical, false);
}
else
{
var vertical = isVertical ? GridLayoutManager.Vertical : GridLayoutManager.Horizontal;
layoutManager = new GridLayoutManager(recyclerView.Context, 3, vertical, false);
}
recyclerView.SetLayoutManager(layoutManager);
this.Items = new ObservableCollection<T>(items);
this.CardViewResourceLayout = cardViewResourceLayout;
this.Items.CollectionChanged += delegate
{
this.NotifyDataSetChanged();
};
}
public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType)
{
var itemView = LayoutInflater.From(parent.Context).Inflate(CardViewResourceLayout, parent, false);
#if DEBUG
Log.Info("GenericRecyclerViewAdapter - ", CardViewResourceLayout.ToString());
#endif
RecyclerViewViewHolder vh = new RecyclerViewViewHolder(itemView);
return vh;
}
public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
RecyclerViewViewHolder vh = holder as RecyclerViewViewHolder;
vh.ItemPosition = position;
vh.TemplateView.Tag = position;
vh.TemplateView.Click -= TemplateView_Click;
vh.TemplateView.Click += TemplateView_Click;
ItemViewTemplated?.Invoke(this, vh);
}
public event EventHandler<T> ItemClicked;
private void TemplateView_Click(object sender, EventArgs e)
{
var position = (int)((View)sender).Tag;
this.ItemClicked?.Invoke(sender, this.Items[position]);
}
public override int ItemCount
{
get { return this.Items.Count; }
}
public override long GetItemId(int position)
{
return base.GetItemId(position);
}
}
public class RecyclerViewViewHolder : RecyclerView.ViewHolder, View.IOnCreateContextMenuListener,
IMenuItemOnMenuItemClickListener
{
public View TemplateView { get; private set; }
public int ItemPosition { get; set; }
public event EventHandler<MenuInfo> ContextMenuCreated;
public event EventHandler<object> MenuItemClicked;
public MenuInfo MenuInfo { get; private set; }
public object Data { get; set; }
public RecyclerViewViewHolder(View itemView) : base(itemView)
{
// Locate and cache view references:
this.TemplateView = itemView;
this.TemplateView.SetOnCreateContextMenuListener(this);
}
public void OnCreateContextMenu(IContextMenu menu, View v, IContextMenuContextMenuInfo menuInfo)
{
MenuInfo = new MenuInfo(menu, v, menuInfo);
ContextMenuCreated?.Invoke(this, MenuInfo);
}
private Android.Views.MenuInflater menuInflater = null;
/// <summary>
/// After ContextMenuCreated
/// </summary>
/// <param name="resourcemenu"></param>
public void InflateMenu(int resourcemenu, SpannableString titleColor = null, object dta = null)
{
if (dta != null)
this.Data = dta;
if (this.TemplateView.Context is AppCompatActivity activity)
{
menuInflater = activity.MenuInflater;
}
else if (this.TemplateView.Context is Activity activity2)
{
menuInflater = activity2.MenuInflater;
}
var contextMenu = this.MenuInfo.ContextMenu;
contextMenu.Clear();
menuInflater.Inflate(resourcemenu, contextMenu);
var num = contextMenu.Size() - 1;
for (int i = 0; i <= num; i++)
{
var men = contextMenu.GetItem(i);
if(titleColor != null)
{
if (i == 0)
{
men.SetTitle(titleColor);
men.SetChecked(true);
}
}
if (i != 0)
{
men.SetOnMenuItemClickListener(this);
}
}
}
public bool OnMenuItemClick(IMenuItem item)
{
this.MenuItemClicked?.Invoke(item, this.Data);
return true;
}
public float PosX;
public float PosY;
}
public class MenuInfo
{
public IContextMenu ContextMenu { get; }
public View View { get; }
public IContextMenuContextMenuInfo ContextMenuInfo { get; }
public MenuInfo(IContextMenu contextMenu, View view, IContextMenuContextMenuInfo menuInfo)
{
this.ContextMenu = contextMenu;
this.View = view;
this.ContextMenuInfo = menuInfo;
}
}
}
用法
RecyclerView recyclerView = new RecyclerView(this);
var viewAdapter = new Android.Basic.Core.GenericRecyclerViewAdapter<Java.IO.File>(recyclerView, files, Resource.Layout.directory_item);
var indiColor = ThemeHelper.IsDark ? ColorHelper.GetRandomLightColor() : ColorHelper.GetRandomDarkColor();
viewAdapter.ItemViewTemplated += (dd, holder) =>
{
var file = files[holder.ItemPosition];
var view = holder.ItemView;
var expanded = view.FindViewById<ExpandedView>(Resource.Id.expandedView);
expanded.SetToggleColor(indiColor);
expanded.SetTitle(file.Name);
GenerateRecycler(expanded, file);
};
recyclerView.SetAdapter(viewAdapter);
expandedView.AddExpandedView(recyclerView);