從配接器xamarinandroid修改父布局的textview-有解無憂

抱歉，我正在使用谷歌翻譯。您好，我正在使用 Visual Studio 2017 在 xamarin android 中開發一個應用程式來接受請求，我將資訊從片段發送到 List<EN_WishDetail> 以存盤專案的選擇，并將其轉儲到配接器以在另一個片段中顯示它。我的問題是父布局加載了一個自定義串列視圖，其中我有 2 個按鈕來增加和減少正常作業的專案的數量，同樣在父布局中它有兩個文本視圖來計算專案的數量和總價值order ，我希望在增加數量時，這也會從按鈕功能所在的配接器更新父布局的文本視圖。如何從配接器訪問父布局并修改其值。

布局

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:background="#FFFFFF">

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="0dp"
    android:orientation="vertical"
    android:layout_weight="5">

<TextView
    android:text="Cesta de Pedido"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@ id/textView1"
    android:gravity="center"
    android:textSize="20dip"
    android:textColor="@color/primaryDark" />
 <ListView
    android:minWidth="25px"
    android:minHeight="25px"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@ id/List" />
</LinearLayout>


<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="0dp"
    android:orientation="vertical"
    android:layout_weight="1"
    android:background="#000000">
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <TextView
            android:id="@ id/itemItems"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dp"
            android:layout_marginTop="6dp"
            android:text="(0) Items"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:gravity="left"
            android:layout_weight="3"
            android:textColor="#FFFFFF"/>
        <Button
            android:id="@ id/btnClear"
            android:layout_width="50dp"
            android:layout_height="40dp"
            android:text="Clear"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:background="@drawable/Blue_button"
            style="@style/button_text"
            android:layout_weight="1"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:id="@ id/itemTotal"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dp"
            android:layout_marginTop="6dp"
            android:text="S/. 0.00"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:gravity="left"
            android:layout_weight="3"
            android:textColor="#FFFFFF"/>
        <Button
            android:id="@ id/btnSave"
            android:layout_width="50dp"
            android:layout_height="40dp"
            android:text="Guardar"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:background="@drawable/Blue_button"
            style="@style/button_text"
            android:layout_weight="1"/>
    </LinearLayout>


    
    
</LinearLayout>

串列視圖個性化

<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="8dp">
<ImageView
    android:id="@ id/Image"
    android:layout_width="72dp"
    android:layout_height="72dp"
    android:layout_alignParentLeft="true"
    android:layout_marginRight="8dp"
    android:src="@drawable/Pedidos"
    android:scaleType="fitXY"/>
<TextView
    android:id="@ id/Articulo"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignTop="@id/Image"
    android:layout_toRightOf="@id/Image"
    android:layout_marginTop="0dip"
    android:text="This is Line1"
    android:lines="2"
    android:maxLines="2"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:textColor="@color/colorTexto"/>
<TextView
    android:id="@ id/MonedaU"
    android:layout_width="25dp"
    android:layout_height="wrap_content"
    android:layout_below="@id/Articulo"
    android:layout_marginTop="0dip"
    android:text="S/."
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:layout_toRightOf="@id/Image"/>
<TextView
    android:id="@ id/PrecioU"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@id/Articulo"
    android:layout_marginTop="0dip"
    android:text="This is line2"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:layout_toRightOf="@id/MonedaU"
    android:singleLine="true"/>
<TextView
    android:id="@ id/MonedaT"
    android:layout_width="25dp"
    android:layout_height="wrap_content"
    android:layout_below="@id/Articulo"
    android:layout_marginTop="20dip"
    android:text="S/."
    android:textAppearance="?android:attr/textAppearanceListItem"
    android:layout_toRightOf="@id/Image"
    android:textStyle="bold"
    android:textColor="@color/colorResaltado"/>
<TextView
    android:id="@ id/Importe"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@id/Articulo"
    android:layout_marginTop="20dip"
    android:text="This is line3"
    android:textAppearance="?android:attr/textAppearanceListItem"
    android:layout_toRightOf="@id/MonedaT"
    android:textStyle="bold"
    android:textColor="@color/colorResaltado"/>
<Button
    android:id="@ id/btnMin"
    android:layout_width="30dp"
    android:layout_height="30dp"
    android:layout_below="@id/Articulo"
    android:layout_toLeftOf="@ id/Cantidad"
    android:text="-"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:background="@drawable/red_button"
    style="@style/button_text" />
<EditText
    android:id="@ id/Cantidad"
    android:layout_width="40dp"
    android:layout_height="wrap_content"
    android:layout_toLeftOf="@ id/btnMax"
    android:layout_marginTop="5dip"
    android:layout_below="@id/Articulo"
    android:textColor="#000000"
    android:background="#FFFFFF"
    android:text="0"
    android:singleLine="true"
    android:maxLines="1"
    android:inputType="number"
    android:gravity="center"
    android:textAlignment="center"/>

<Button
    android:id="@ id/btnMax"
    android:layout_width="30dp"
    android:layout_height="30dp"
    android:layout_below="@id/Articulo"
    android:layout_toLeftOf="@ id/btnDel"
    android:text=" "
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:background="@drawable/red_button"
    android:layout_gravity="right"
    style="@style/button_text" />

<ImageButton
    android:id="@ id/btnDel"
    android:src="@drawable/Trash_"
    android:layout_width="30dp"
    android:layout_height="30dp"
    android:layout_below="@id/Articulo"
    android:layout_alignParentRight="true"
    style="@style/button_text" />
   </RelativeLayout>

分段

 public class WishFragment : Fragment  
{
    public WishFragment MyFragment()
    {
        return this;
    }

    public WishFragment()
    {
        RetainInstance = true;
    }
    private ListView WishlistView;
    WishAdapter adapter;        
    List<EN_WishDetalle> List_Wish = new List<EN_WishDetalle>();
           
    public override View OnCreateView(LayoutInflater inflater, Android.Views.ViewGroup container, Android.OS.Bundle savedInstanceState)
    {
        base.OnCreateView(inflater, container, savedInstanceState);

        //HasOptionsMenu = true;
        var view = inflater.Inflate(Resource.Layout.Main_Wish, null);

        WishlistView = view.FindViewById<ListView>(Resource.Id.List);
        EditText txtCantidad = view.FindViewById<EditText>(Resource.Id.Cantidad);

        List_Wish = Variables.WishDetalle;

        adapter = new WishAdapter(Activity, List_Wish);
        WishlistView.Adapter = adapter;

        WishlistView = view.FindViewById<ListView>(Resource.Id.List);

        Button buttonMax = view.FindViewById<Button>(Resource.Id.btnMax);
        Button buttonMin = view.FindViewById<Button>(Resource.Id.btnMin);
        ImageButton buttonDel = view.FindViewById<ImageButton>(Resource.Id.btnDel);
        TextView txtContador = view.FindViewById<TextView>(Resource.Id.itemItems);
        TextView txtTotal = view.FindViewById<TextView>(Resource.Id.itemTotal);

        WishlistView.ItemClick  = buttonMax_ItemClick;

        txtContador.Text ="( "   List_Wish.Count.ToString()   " ) Items";
        decimal suma = List_Wish.Sum(item => Convert.ToDecimal(item.importetotal));
        txtTotal.Text = "S/. "   suma.ToString("N");
        //WishlistView.ItemClick  = buttonMin_ItemClick;
        //WishlistView.ItemClick  = buttonDel_ItemClick;

        return view;
    }

    void buttonMax_ItemClick(object sender,AdapterView.ItemClickEventArgs e)
    {
        
    }
    void buttonMin_ItemClick(object sender, AdapterView.ItemClickEventArgs x)
    {

    }
    void buttonDel_ItemClick(object sender, AdapterView.ItemClickEventArgs z)
    {

    }

}

配接器

public class WishAdapter : BaseAdapter<EN_WishDetalle>
{
    
    List<EN_WishDetalle> sList;
    Context sContext;
    public WishAdapter(Context context, List<EN_WishDetalle> list)
    {
        sList = list;
        sContext = context;
    }
    public override EN_WishDetalle this[int position]
    {
        get
        {
            return sList[position];
        }
    }
    public override int Count
    {
        get
        {
            return sList.Count;
        }
    }
    public override long GetItemId(int position)
    {
        return position;
    }
    public override View GetView(int position, View convertView, ViewGroup parent)
    {
        var item = sList[position];

        View view = convertView; // re-use an existing view, if one is available
        MyViewHolder holder;


        if (view != null)
        {
            holder = view.Tag as MyViewHolder;

            holder.buttonDel.Tag = position;
            //holder.buttonMax.Tag = position;
            //holder.buttonMin.Tag = position;
        }
        else
        { // otherwise create a new one
            holder = new MyViewHolder();

            LayoutInflater inflater = 
            (LayoutInflater)sContext.GetSystemService(Context.LayoutInflaterService);
            view = inflater.Inflate(Resource.Layout.item_Wish, null);

            holder.txtPrecioU = view.FindViewById<TextView>(Resource.Id.PrecioU);
            holder.txtArticulo = view.FindViewById<TextView>(Resource.Id.Articulo);
            holder.txtCantidad = view.FindViewById<TextView>(Resource.Id.Cantidad);
            holder.txtImporte = view.FindViewById<TextView>(Resource.Id.Importe);
            holder.txtMonedaU = view.FindViewById<TextView>(Resource.Id.MonedaU);
            holder.txtMonedaT = view.FindViewById<TextView>(Resource.Id.MonedaT);
            holder.Art = view.FindViewById<ImageView>(Resource.Id.Image);

            holder.buttonMax = view.FindViewById<Button>(Resource.Id.btnMax);
            holder.buttonMin = view.FindViewById<Button>(Resource.Id.btnMin);
            holder.buttonDel = view.FindViewById<ImageButton>(Resource.Id.btnDel);
                            
            holder.buttonMax.Click  = delegate
            {
                sList[position].cantidad = sList[position].cantidad   1;
                sList[position].importetotal = Convert.ToString( sList[position].cantidad * Convert.ToDecimal(item.punitario));
                holder.txtCantidad.SetText(Convert.ToString(sList[position].cantidad), TextView.BufferType.Normal);
                string format_importe = (sList[position].cantidad * Convert.ToDecimal(item.punitario)).ToString("N");
                holder.txtImporte.SetText(format_importe, TextView.BufferType.Normal);
               
            };

            holder.buttonMin.Click  = delegate
            {
                if (sList[position].cantidad > 1) {
                    sList[position].cantidad = sList[position].cantidad - 1;
                    sList[position].importetotal = Convert.ToString(sList[position].cantidad * Convert.ToDecimal(item.punitario));
                    holder.txtCantidad.SetText(Convert.ToString(sList[position].cantidad), TextView.BufferType.Normal);
                    string format_importe = (sList[position].cantidad * Convert.ToDecimal(item.punitario)).ToString("N");
                    holder.txtImporte.SetText(format_importe, TextView.BufferType.Normal);
                    
                }
            };

            holder.buttonDel.Click  = delegate
            {   // we get the tag here for  buttonDel
                int x = (int)holder.buttonDel.Tag;

                Android.App.AlertDialog.Builder dialog = new AlertDialog.Builder(sContext);
                AlertDialog alert = dialog.Create();
                alert.SetTitle("GumisaAPP");
                alert.SetMessage("Eliminar item : ("   x.ToString()   ") - "   sList[position].codigo   sList[position].articulo);
                alert.SetIcon(Resource.Drawable.Alerta);
                alert.SetButton("OK", (c, ev) =>
                {
                    sList.RemoveAt(position);
                    NotifyDataSetChanged();

                });
                alert.SetButton2("CANCEL", (c, ev) =>
                {

                });
                alert.Show();

            };

            holder.buttonDel.Tag = position;
            view.Tag = holder;
        }

        holder.txtPrecioU.Text = Convert.ToDecimal(item.punitario).ToString("N");
        holder.txtArticulo.Text = item.articulo;
        holder.txtCantidad.Text = item.cantidad.ToString();
        holder.txtImporte.Text =  Convert.ToDecimal(item.importetotal).ToString("N");
        holder.txtMonedaU.Text = item.moneda;
        holder.txtMonedaT.Text = item.moneda;
        holder.Art.SetImageResource(Android.Resource.Color.Transparent);

        if (sList[position].imagenproducto == "")
        {
            holder.Art.SetImageResource(Resource.Drawable.NoDisponible);
        }
        else
        {
            Android.Net.Uri myUri = (Android.Net.Uri.Parse(sList[position].imagenproducto));
            //Art.SetImageURI(myUri);
            holder.Art.SetImageURI(myUri);
        }
                   
        return view;
        
    }


    public class MyViewHolder : Java.Lang.Object
    {
        public TextView txtPrecioU { get; set; }
        public TextView txtArticulo { get; set; }
        public TextView txtCantidad { get; set; }
        public TextView txtImporte { get; set; }
        public TextView txtMonedaU { get; set; }
        public TextView txtMonedaT { get; set; }
        public ImageView Art { get; set; }
        public Button buttonMax { get; set; }

        public Button buttonMin { get; set; }
        public ImageButton buttonDel { get; set; }

    }

}

在此處輸入影像描述

我希望你能指導我遵循的方式，謝謝你的時間。

uj5u.com熱心網友回復：

event是的，正如 ToolmakerSteve 提到的那樣，您可以使用它來實作這一點。

我做了一個簡單的demo給int主頁面傳引數，可以參考以下代碼：

1.在您的配接器中，定義變數MyEvent：

public class WishAdapter : BaseAdapter<EN_WishDetalle>
{    
    // add EventHandler here
    public event EventHandler<int> MyEvent;

    //other code

    public WishAdapter(Context context, List<EN_WishDetalle> list)
   {
      sList = list;
      sContext = context;
   }
   //other code
}

GetView2.在類的方法中WishAdapter ，為按鈕添加代碼buttonMax：

  holder.buttonMax.Click  = delegate
   {
     // other code

      // invoke here
      MyEvent?.Invoke(this, 1);

    };

3.在WishFragment，這樣做：

    adapter = new WishAdapter(Activity, List_Wish);
    WishlistView.Adapter = adapter;
    adapter.MyEvent  = Adapter_MyEvent;

方法Adapter_MyEvent是：

    private void Adapter_MyEvent(object sender, int e)
    {   // here we can get the passed parameter e
        Debug.WriteLine("The passed parameter : "   e);
    }

轉載請註明出處，本文鏈接：https://www.uj5u.com/gongcheng/476131.html

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