我有一个很大的问题（对我来说，我希望你在Xamarin中更好;）
我有一个Recyclerview和一个适配器就像Xamarin的例子一样，所以现在我需要在CardView的新Projekt 2.按钮一个用于+和另一个 - ，我得到两个按钮工作，但不是真的很好，因为很多时候+没有在错误的CardView上做正确的操作。
问我是否需要更多输入，我现在很困惑：/
这是我的代码：
BelPOSAdapter.cs：
public ArtikelDaten(string BELidxRAW, string Mandant)
{
BELIdx = BELidxRAW;
List<.....> WWSVCconnections = Utils.Init(Mandant);
foreach (..... in WWSVCconnections)
{
..../hier is something that gives me the Json.
string WWbelPosResp = getRes.Content;
//JSON in Foreach
mBuiltInPOS.Clear();
dynamic dynPOSJson = JsonConvert.DeserializeObject(WWbelPosResp);
foreach (var POSitem in dynPOSJson["POSITIONSLISTE"]["POSITION"])
{
mBuiltInPOS.Add(new Artikel
{
//Info, KEINE anzeige
mARTBELart = POSitem["POS_2_1"].ToString(),
mARTBELnr = POSitem["POS_3_8"].ToString(),
//Anzeige
mARTBELlfdnr = POSitem["POS_11_6"].ToString(),
mARTnr = POSitem["POS_18_25"].ToString(),
mARTbezeichnung = POSitem["POS_45_60"].ToString(),
mARTretourMenge = "0",
mARTmenge = POSitem["POS_164_8"].ToString(),
mARTeinheit = " " + POSitem["POS_689_5"].ToString()
});
}
}
mArtikel = mBuiltInPOS.ToArray();
ScanPositionenActivity.cs：
public class POSViewHolder : RecyclerView.ViewHolder
{
//1public ImageView Image { get; private set; }
public TextView ARTnr { get; private set; }
public TextView ARTbezeichnung { get; private set; }
public TextView ARTmenge { get; private set; }
public TextView ARTretourMenge { get; private set; }
public TextView ARTBELnr { get; private set; }
public TextView ARTBELart { get; private set; }
public ImageButton ARTminus { get; set; }
public ImageButton ARTplus { get; set; }
public TextView ARTBELlfdnr { get; private set; }
// Get references to the views defined in the CardView layout.
//public POSViewHolder(View itemView, Action<int> listener) : base(itemView)
public POSViewHolder(View itemView, Action<int> listener) : base(itemView)
{
// Locate and cache view references:
//1Image = itemView.FindViewById<ImageView>(Resource.Id.imageView);
ARTnr = itemView.FindViewById<TextView>(Resource.Id.LBLartNr);
ARTbezeichnung = itemView.FindViewById<TextView>(Resource.Id.LBLartBezeichnung);
ARTmenge = itemView.FindViewById<TextView>(Resource.Id.LBLartMenge);
ARTretourMenge = itemView.FindViewById<TextView>(Resource.Id.LBLretourMenge);
ARTBELnr = itemView.FindViewById<TextView>(Resource.Id.LBL_kommission_belnr);
ARTBELart = itemView.FindViewById<TextView>(Resource.Id.LBL_kommission_belart);
ARTBELlfdnr = itemView.FindViewById<TextView>(Resource.Id.LBL_kommission_POSlfdnr);
// Detect user clicks on the item view and report which item
// was clicked (by layout position) to the listener:
itemView.Click += (sender, e) => listener(base.LayoutPosition);
}
}
//----------------------------------------------------------------------
// ADAPTER
// Adapter to connect the data set (photo album) to the RecyclerView:
public class PhotoAlbumAdapter : RecyclerView.Adapter
{
// Event handler for item clicks:
public event EventHandler<int> ItemClick;
// Underlying data set (a photo album):
public ArtikelDaten mPOSdaten;
// Load the adapter with the data set (photo album) at construction time:
public PhotoAlbumAdapter(ArtikelDaten photoAlbum)
{
mPOSdaten = photoAlbum;
}
// Create a new photo CardView (invoked by the layout manager):
public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType)
{
// Inflate the CardView for the photo:
View itemView = LayoutInflater.From(parent.Context).Inflate(Resource.Layout.BelPOSview, parent, false);
ImageButton BTNminus = itemView.FindViewById<ImageButton>(Resource.Id.BTNminus);
ImageButton BTNplus = itemView.FindViewById<ImageButton>(Resource.Id.BTNplus);
// Create a ViewHolder to find and hold these view references, and
// register OnClick with the view holder:
//POSViewHolder vh = new POSViewHolder(itemView, OnClick);
POSViewHolder vh = new POSViewHolder(itemView, OnClick) { ARTminus = BTNminus, ARTplus = BTNplus};
return vh;
}
// Fill in the contents of the photo card (invoked by the layout manager):
public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
POSViewHolder vh = holder as POSViewHolder;
// Set the ImageView and TextView in this ViewHolder's CardView
// from this position in the photo album:
//1vh.Image.SetImageResource(mPOSdaten[position].PhotoID);
vh.ARTnr.Text = mPOSdaten[position].mARTnr;
vh.ARTbezeichnung.Text = mPOSdaten[position].mARTbezeichnung;
vh.ARTmenge.Text = mPOSdaten[position].mARTmenge;
vh.ARTretourMenge.Text = mPOSdaten[position].mARTretourMenge;
vh.ARTBELnr.Text = mPOSdaten[position].mARTBELnr;
vh.ARTBELart.Text = mPOSdaten[position].mARTBELart;
vh.ARTBELlfdnr.Text = mPOSdaten[position].mARTBELlfdnr;
//RECYCLEVIEW Buttons
vh.ARTplus.Click -= BTNplus_Click;
vh.ARTplus.Click += BTNplus_Click;
vh.ARTminus.Click -= BTNminus_Click;
vh.ARTminus.Click += BTNminus_Click;
}
private void BTNplus_Click(object sender, EventArgs e)
{
//int position = this.RecyclerView.GetChildAdapterPosition((View)sender);
//Toast.MakeText(mContext, vh.ARTretourMenge.Text, ToastLength.Short).Show();
mPOSdaten[position].mARTretourMenge = (Convert.ToInt32(mPOSdaten[position].mARTretourMenge) + 1).ToString();
NotifyItemChanged(position);
}
private void BTNminus_Click(object sender, EventArgs e)
{
if (mPOSdaten[position].mARTretourMenge != "0")
{
//Toast.MakeText(mContext, vh.ARTretourMenge.Text, ToastLength.Short).Show();
mPOSdaten[position].mARTretourMenge = (Convert.ToInt32(mPOSdaten[position].mARTretourMenge) - 1).ToString();
NotifyItemChanged(position);
}
}
所以在OnBindViewHolder中我有我的按钮按下Funktion按下它们工作不错，但我需要CardView / Data的位置，我正在阅读我可以用int position = this.RecyclerView.GetChildAdapterPosition((View)sender);找到它但是，这不起作用，我不知道它是如何运作的。
答案 0 :(得分：0)
RecyclerView.ViewHolder有两个有趣的属性：
LayoutPosition：为您提供布局中的位置。如果您正在执行拖放等操作或者在屏幕上重新排序行，则非常有用。AdapterPosition：为您提供适配器中的位置。这通常会反映您在适配器中使用的数据源中的位置。由于sender对象可能只是为您提供了包含click事件的按钮，因此您需要获得ViewHolder。
一种方法是在RecyclerView.ViewHolder的{{1}}属性上添加Tag实例。另一种方法是View本身具有减号和加号按钮的事件。我个人更喜欢后者。
RecyclerView.ViewHolder然后在绑定public class POSViewHolder : RecyclerView.ViewHolder
{
public event EventHandler MinusClick;
public event EventHandler PlusClick;
public TextView ARTnr { get; private set; }
public TextView ARTbezeichnung { get; private set; }
public TextView ARTmenge { get; private set; }
public TextView ARTretourMenge { get; private set; }
public TextView ARTBELnr { get; private set; }
public TextView ARTBELart { get; private set; }
public ImageButton ARTminus { get; set; }
public ImageButton ARTplus { get; set; }
public TextView ARTBELlfdnr { get; private set; }
public POSViewHolder(View itemView) : base(itemView)
{
...
ARTminus.Click += OnMinusClick;
Artplus.Click += OnPlusClick;
}
private void OnMinusClick(object s, EventArgs e)
{
MinusClick?.Invoke(this, EventArgs.Empty);
}
private void OnPlusClick(object s, EventArgs e)
{
PlusClick?.Invoke(this, EventArgs.Empty);
}
}
：
ViewHolder