Xamarin.Android Recyclerview项目单击听不工作

Recyclerview项目单击不工作。下面是我的适配器的代码和ViewHolder.I随后从教程xamarin文档上提供的图案here Xamarin.Android Recyclerview项目单击听不工作

public class MainMenuRecyclerAdapter : RecyclerView.Adapter 
{ 
    private readonly IList<ListMenuItem> items; 



    public MainMenuRecyclerAdapter(IList<ListMenuItem> data) 
    { 
     items = data; 
    } 

    public override int ItemCount => items.Count; 
    public event EventHandler<ClickEventArgs> ItemClick; 
    public event EventHandler<ClickEventArgs> ItemLongClick; 

    /// <summary> 
    ///  Create new views (invoked by the layout manager) 
    /// </summary> 
    /// <param name="parent"></param> 
    /// <param name="viewType"></param> 
    /// <returns></returns> 
    public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType) 
    { 
     //Setup your layout here 
     const int id = Resource.Layout.MenuList; 

     MainMenuRecyclerAdapterViewHolder vh; 

     View itemView; 
     using (itemView = LayoutInflater.From(parent.Context).Inflate(id, parent, false)) 
     { 
      vh = new MainMenuRecyclerAdapterViewHolder(itemView, OnClick, OnLongClick); 
     } 
     return vh; 
    } 


    /// <summary> 
    ///  Replace the contents of a view (invoked by the layout manager) 
    /// </summary> 
    /// <param name="viewHolder"></param> 
    /// <param name="position"></param> 
    public override void OnBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) 
    { 
     var item = items[position]; 
     // Replace the contents of the view with that element 
     var holder = viewHolder as MainMenuRecyclerAdapterViewHolder; 
     if (holder == null) return; 
     holder.mnuHeader.Text = item.MenuHeader; 

     holder.mnuDescription.Text = item.MenuDetails; 

     switch (item.MenuKey) 
     { 
      case "CreateNew": 
       holder.mnuIcon.SetImageResource(Resource.Drawable.createrecord); 
       break; 
      case "ViewRecords": 
       holder.mnuIcon.SetImageResource(Resource.Drawable.vieweditrecord); 
       break; 
      case "SNR": 
       holder.mnuIcon.SetImageResource(Resource.Drawable.keyinformantsubmissions); 
       break; 
      case "SNRLog": 
       holder.mnuIcon.SetImageResource(Resource.Drawable.taskchecklist); 
       break; 
      case "AnalysisView": 
       holder.mnuIcon.SetImageResource(Resource.Drawable.viewprogressreport); 
       break; 
      case "SendUpdates": 
       holder.mnuIcon.SetImageResource(Resource.Drawable.syncwithserver); 
       break; 
      case "DeviceStatus": 
       holder.mnuIcon.SetImageResource(Resource.Drawable.devicestatus); 
       break; 
      case "SystemSettings": 
       holder.mnuIcon.SetImageResource(Resource.Drawable.settings); 
       if (item.MenuDetails.Contains("Harare") && item.MenuKey == "SystemSettings") 
       { 
        holder.mnuDescription.SetTextColor(Color.Green); 
        holder.mnuDescription.Text += " - TRAINING MODE"; 
       } 
       if (!item.MenuDetails.Contains("Harare")) 
       { 
        holder.mnuDescription.SetTextColor(Color.Red); 
        holder.mnuDescription.Text += " - VBCI MODE"; 
       } 
       break; 
      case "DBSettings": 
       holder.mnuIcon.SetImageResource(Resource.Drawable.database); 
       break; 
      default: 
       holder.mnuIcon.SetImageResource(Resource.Drawable.addbutton); 
       break; 
     } 

    } 

    private void OnClick(ClickEventArgs args) 
    { 
     ItemClick?.Invoke(this, args); 
    } 


    private void OnLongClick(ClickEventArgs args) 
    { 
     ItemLongClick?.Invoke(this, args); 
    } 
} 

public class MainMenuRecyclerAdapterViewHolder : RecyclerView.ViewHolder 
{ 
    public TextView mnuDescription; 
    public TextView mnuHeader; 
    public ImageView mnuIcon; 


    public MainMenuRecyclerAdapterViewHolder(View itemView, Action<ClickEventArgs> clickListener,Action<ClickEventArgs> longClickListener) : base(itemView) 
    { 
     mnuHeader = itemView.FindViewById<TextView>(Resource.Id.txtMenuHeader); 
     mnuDescription = itemView.FindViewById<TextView>(Resource.Id.txtMenuDetail); 
     mnuIcon = itemView.FindViewById<ImageView>(Resource.Id.imgMenuIcon); 

     itemView.Click += (sender, e) => clickListener(
      new ClickEventArgs { View = itemView, Position = AdapterPosition }); 

     itemView.LongClick +=(sender, e) => longClickListener(
       new ClickEventArgs { View = itemView, Position = AdapterPosition }); 
    } 

} 

public class ClickEventArgs : EventArgs 
{ 
    public View View { get; set; } 
    public int Position { get; set; } 
}

我的活动代码

private void InitRecyclerView() { 
     try 
     { 
      SetContentView(Resource.Layout.MainLayout); 

      LoadMenuItems(); 

      dbPath = CheckDB(); 

      var toolbar = FindViewById<Android.Support.V7.Widget.Toolbar>(Resource.Id.toolbar); 

      toolbar.SetPadding(0, GetStatusBarHeight(), 0, 0); 

      //Using the new recycler view 
      recyclerView = FindViewById<RecyclerView>(Resource.Id.recycleView); 

      recyclerView.SetLayoutManager(new LinearLayoutManager(this)); 

      mainMenuRecyclerAdapter = new MainMenuRecyclerAdapter(lstMnu); 

      mainMenuRecyclerAdapter.ItemClick += RecyclerOnItemClick; 

      recyclerView.SetAdapter(mainMenuRecyclerAdapter); 
     } 
     catch (Exception ex) 
     { 
      new AlertDialog.Builder(this) 
          .SetTitle("Homescreen - InitRecyclerView()") 
          .SetMessage("Error Occurred: " + ex.Message) 
          .SetPositiveButton("Ok", delegate { }) 
          .Show(); 
     }}

我的XAML代码

<android.support.design.widget.CoordinatorLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:fitsSystemWindows="true"><android.support.design.widget.AppBarLayout 
    android:id="@+id/appBar" 
    android:layout_width="match_parent" 
    android:layout_height="180dp" 
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" 
    android:fitsSystemWindows="true"> 

    <android.support.design.widget.CollapsingToolbarLayout 
     android:id="@+id/collapsingToolbar" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     app:layout_scrollFlags="scroll|exitUntilCollapsed" 
     android:fitsSystemWindows="true" 
     app:contentScrim="@android:color/white" 
     app:expandedTitleMarginStart="48dp" 
     app:expandedTitleMarginEnd="64dp"> 
     <ImageView 
     android:src="@drawable/RwimsHomeScreen" 
     android:id="@+id/imageView1" 
     android:layout_width="match_parent" 
     android:layout_height="180dp" 
     android:scaleType="fitCenter" 
     android:fitsSystemWindows="true" 
     app:layout_collapseMode="parallax" 
     android:background="@android:color/white"/> 
     <android.support.v7.widget.Toolbar 
     android:id="@+id/toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="?attr/actionBarSize" 
     app:popupTheme="@style/ThemeOverlay.AppCompat.Light" 
     app:layout_collapseMode="pin" /> 
    </android.support.design.widget.CollapsingToolbarLayout> 
    </android.support.design.widget.AppBarLayout> 

    <android.support.v7.widget.RecyclerView 
    android:layout_height="match_parent" 
    android:layout_width="match_parent" 
    android:id="@+id/recycleView" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior"> 
    </android.support.v7.widget.RecyclerView> 

    <android.support.design.widget.FloatingActionButton 
    android:layout_height="wrap_content" 
    android:layout_width="wrap_content" 
    android:layout_margin="@dimen/fab_margin" 
    android:src="@drawable/ic_date_range_white_48dp" 
    app:layout_anchor="@id/appBar" 
    app:layout_anchorGravity="bottom|end" /> 
</android.support.design.widget.CoordinatorLayout>

InitRecyclerView()函数就是我在Activity OnCreateView方法中调用的函数。我的档案按此方法基本上是这样的：

private void RecyclerOnItemClick(object sender, ClickEventArgs e) 
     { 

       var vibrator = (Vibrator)GetSystemService(VibratorService); 
       vibrator.Vibrate(60); 

       switch (lstMnu[e.Position].MenuKey) 
       { 
        case "CreateNew": 
         var intentCW = new Intent(this, typeof(ActFormSelectionMenu)); 
         intentCW.PutExtra("CreateNew", "true"); 
         StartActivity(intentCW); 
         break; 
        case "ViewRecords": 
         var intentVw = new Intent(this, typeof(ActFormSelectionMenu)); 
         intentVw.PutExtra("CreateNew", "false"); 
         StartActivity(intentVw); 
         break; 
default: 
         Log.Debug("EmptyMenu", "---"); 
         break; 
       } 
      }

MenuKey是基本上包含这样描述的其他属性的ListMenuItem对象的属性，标题etcThe lstMnu变量被初始化和加载（通过另一种方法）之前recyclerview是初始化。我不知道代码有什么问题，但不知何故recyclerview没有响应click事件。如果我更改recyclerview以使用列表视图，菜单运行完美。帮帮我吧。

来源

2017-08-10 Takudzwa Mawarire

您是否尝试调试您的项目？你可以检查'RecyclerOnItemClick'方法是否被触发。 –

不，没有。调试后会更新。谢谢@ YorkShen-MSFT。曾尝试在方法中加入烤面包，但未显示出来。 –

我测试了你的代码，我用'string'来代替你的'ListMenuItem'类，发现它工作正常。 –

Recyclerview项目点击不起作用。

其实它确实发生了，但它发生在SetRecyclerAdaptor()您已在OnResume方法中定义。

protected override void OnResume() 
{ 
    base.OnResume(); 
    SetRecyclerAdaptor(); 
} 

private void SetRecyclerAdaptor() 
{ 
    mainMenuRecyclerAdapter = new MainMenuRecyclerAdapter(lstMenu); 
    mainMenuRecyclerAdapter.ItemClick += (sender, e) => 
    { 
      Toast.MakeText(this,"Click happened here!",ToastLength.Short).Show(); 
    }; 

    recyclerView.SetAdapter(mainMenuRecyclerAdapter); 
}

注释掉上面的代码将解决你的问题。

来源

2017-08-16 02:33:18

Xamarin.Android Recyclerview项目单击听不工作

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