Adapterview点击事件

即时通讯与xamarin android应用程序的问题是，一旦我调用适配器中的任何项目上的单击事件它将工作，但它调用的不仅仅是我单击的一个，例如我的意思是点击共享和共享意图将显示在列表视图适配器中的多个项目上，但不止一次。这是适配器中的代码。请让我知道如何解决这个问题。我曾试图代表，甚至要禁止上点击其他列表视图项的程度Adapterview点击事件

代码：

namespace NameSpace 
{ 
    public class dashboardAdapter : BaseAdapter<DashboardLINQ> 
    { 
     List<DashboardLINQ> items; 
     Activity context; 
     string mid; 
     public dashboardAdapter(Activity context, List<DashboardLINQ> items) 
      : base() 
     { 
      this.context = context; 
      this.items = items; 
     } 
     public override long GetItemId(int position) 
     { 
      return position; 
     } 
     public override DashboardLINQ this[int position] 
     { 
      get { return items[position]; } 
     } 
     public override int Count 
     { 
      get { return items.Count; } 
     } 
     public override View GetView(int position, View convertView, ViewGroup parent) 
     { 
      View view = convertView; 
      if (view == null) 
      { 
       view = LayoutInflater.From(context).Inflate (Resource.Layout.dashboardItemLayout, null, false); 
      } 

      ImageView prof = view.FindViewById<ImageView>(Resource.Id.imageView1); 
      Koush.UrlImageViewHelper.SetUrlDrawable (prof, "http://www.mymentor.org.za/"+items [position].uPicLocal); 

      mid = items [position].MID; 

      TextView usrname = view.FindViewById<TextView> (Resource.Id.textView1); 
      usrname.Text = items [position].uFullName; 

      TextView date = view.FindViewById<TextView> (Resource.Id.textView2); 
      date.Text = items [position].pDate; 

      ImageView imagen = view.FindViewById<ImageView>(Resource.Id.imageView2); 
      Koush.UrlImageViewHelper.SetUrlDrawable (imagen, "http://www.mymentor.org.za/"+items [position].pImage); 

      TextView desc = view.FindViewById<TextView> (Resource.Id.textView3); 
      desc.Text = Html.FromHtml (items [position].pDesc).ToString(); 

      TextView comlike = view.FindViewById<TextView> (Resource.Id.textView4); 
      comlike.Text = "Likes: "+items [position].likecnumrows+" Comments: "+items [position].commentscnumrows; 

      ImageButton like = view.FindViewById<ImageButton> (Resource.Id.button1); 
      ImageButton comment = view.FindViewById<ImageButton> (Resource.Id.button2); 
      ImageButton share = view.FindViewById<ImageButton> (Resource.Id.button3); 

      like.Click += delegate(object sender, EventArgs e) { 
       WebClient client = new WebClient(); 
       Uri uri = new Uri("url"); 
       NameValueCollection parameters = new NameValueCollection(); 
       parameters.Add("UID", items[position].MID); 
       parameters.Add("PID", items[position].ID); 
       client.UploadValuesAsync(uri, parameters); 
       like.SetImageResource(Resource.Drawable.ButtonComment); 
      }; 


      share.Focusable = false; 
      share.FocusableInTouchMode = false; 
      share.Clickable = true; 

      share.Click += delegate(object sender, EventArgs e) { 
       int MaxLength = 150; 

       var name = Html.FromHtml (items [position].pDesc).ToString(); 
       if (name.Length > MaxLength) { 
        name = name.Substring(0, MaxLength) + "... My Mentor"; 
       } 

       var myIntent = new Intent(Android.Content.Intent.ActionSend); 
       myIntent.PutExtra(Intent.ExtraText, name); 
       myIntent.SetType("text/plain"); 
       this.context.StartActivity(Intent.CreateChooser(myIntent,"Choose an App")); 
      }; 

      return view; 
    } 

}

来源

2015-11-04 Gareth Bredenkamp

发生这种情况，因为Android会重新使用行。您可以尝试使用ViewHolder pattern.ill显示稍后如何执行此操作。 – XTL

@VetaLio请。一整天都在苦苦挣扎。 –

你试过了吗？ – XTL

出现这种情况，是因为Android的重用行和调用GetView方法很多次数（例如，当你滚动你的列表视图，Android自动启动GetView来绘制隐藏的项目，以及为什么你的“点击”重复）。

所以你可以尝试使用ViewHolder模式。检查了这一点（我的小例子）：
MainLayout.axml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"> 
    <ListView 
     android:minWidth="25px" 
     android:minHeight="25px" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/lst" /> 
</LinearLayout>

的代码和ListItem.axml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:minWidth="25px" 
    android:minHeight="25px"> 
    <RelativeLayout 
     android:layout_width="match_parent" 
     android:layout_height="50dp" 
     android:id="@+id/relativeLayout1"> 
     <TextView 
      android:text="Text" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:id="@+id/txt" 
      android:layout_centerInParent="true" /> 
     <Button 
      android:text="PUSH ME" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:id="@+id/Push" 
      android:layout_alignParentRight="true" /> 
    </RelativeLayout> 
</LinearLayout>

的OnCreate（）方法

protected override void OnCreate(Bundle bundle) 
     { 
      base.OnCreate(bundle); 

      SetContentView(Resource.Layout.Main); 

         ListView lst = FindViewById<ListView>(Resource.Id.lst); 

      List<string> Data = new List<string>(); 
      Data.Add("Prosto GG"); 
      Data.Add("Prosto GG"); 
      Data.Add("Prosto GG"); 
      Data.Add("Prosto GG"); 
      Data.Add("Prosto GG"); 
      Data.Add("Prosto GG"); 
      Data.Add("Prosto GG"); 
      Data.Add("Prosto GG"); 
      Data.Add("Prosto GG"); 
      Data.Add("Prosto GG"); 
      Data.Add("Prosto GG"); 
      Data.Add("Prosto GG"); 
      Data.Add("Prosto GG"); 
      Data.Add("Prosto GG"); 
      Data.Add("Prosto GG"); 
      Data.Add("Prosto GG"); 
      CustomAdapter cst = new CustomAdapter(Data, this); 
      lst.Adapter = cst; 

     } 
    }

和这个职位的主要部分，CustomAdapter类：

class CustomAdapter: BaseAdapter<string> 
    { 
     Dialog alertDialog; 
     int count = 0; 
     List<string> _Items; 
     Context _context; 
     public CustomAdapter(List<string> Items,Context context) 
     { 
      this._Items = Items; 
      this._context = context; 
     } 

     #region implemented abstract members of BaseAdapter 
     public override long GetItemId(int position) 
     { 
      return position; 
     } 
     public override View GetView(int position, View convertView, ViewGroup parent) 
     { 
      ServiceViewHolder holder = null; 

      var view = convertView; 

      if (view == null) 
      { 
       ////this is part of ViewHolder pattern,new istance of ViewHolder 
       holder = new ServiceViewHolder(); 
       view = LayoutInflater.From(_context).Inflate(Resource.Layout.ListItem, null); 
       holder.Txt = view.FindViewById<TextView>(Resource.Id.txt); 
       holder.PushME = view.FindViewById<Button>(Resource.Id.Push); 
       //put your handler here,in this block of code,like this 
       holder.PushME.Click += (sender, e) => 
        { 
         count++; 
         var builder = new AlertDialog.Builder(_context); 
         builder.SetTitle("test"); 

         builder.SetMessage(holder.Txt.Text + " " + count); 
         builder.SetCancelable(false); 

         builder.SetPositiveButton("OK", new EventHandler<DialogClickEventArgs>((sender1, e2) => 
          { 
           alertDialog.Dismiss(); 
          })); 
         alertDialog = builder.Create(); 
         alertDialog.SetCanceledOnTouchOutside(false); 
         alertDialog.Show(); 
        }; 
       view.Tag = holder; 
      } 
      else 
      { 
       holder = view.Tag as ServiceViewHolder; 
      } 
      holder.Txt.Text = _Items[position]; 

      return view; 
     } 
     public override int Count 
     { 
      get 
      { 
       return _Items.Count; 
      } 
     } 
     #endregion 
     #region implemented abstract members of BaseAdapter 
     public override string this[int index] 
     { 
      get 
      { 
       return _Items[index]; 
      } 
     } 
     #endregion 

    } 

    public class ServiceViewHolder : Java.Lang.Object 
    { 
     public Button PushME { get; set; } 

     public TextView Txt { get; set; } 

    }

所以，如果你想使用这个模式，你必须做到：

制作类，并定义的属性您控件（列表项）
只要把你的处理程序中的代码，其中的观点是空块（参见下面的代码）

你的情况是这样的：

if(view == null) 
     { 
      //inflate layout and other stuff. 
      holder.like.Click += delegate(object sender, EventArgs e) { 
         WebClient client = new WebClient(); 
         Uri uri = new Uri("url"); 
         NameValueCollection parameters = new NameValueCollection(); 
         parameters.Add("UID", items[position].MID); 
         parameters.Add("PID", items[position].ID); 
         client.UploadValuesAsync(uri, parameters); 
         holder.like.SetImageResource(Resource.Drawable.ButtonComment); 
        }; 

      //etc 
     }

欲了解更多详细信息，请阅读本article！
享受。

来源

2015-11-04 20:39:20 XTL

Adapterview点击事件

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