Recyclerview项目点击不起作用。下面是我的适配器和ViewHolder的代码。我遵循可用的xamarin文档教程中的模式here
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()函数是我在Activity OnCreateView方法上调用的函数。我的项目点击方法基本上如下所示：
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ListMenuItem对象的一个属性，它基本上包含其他属性，如description，header等。在初始化recyclerview之前，lstMnu变量被初始化并加载（通过另一种方法） 。
我无法弄清楚代码有什么问题，但不知何故，recyclelerview没有响应click事件。如果我将recyclerview更改为使用列表视图，菜单工作正常。帮帮我们。
答案 0 :(得分：1)
Recyclerview项目点击不工作。
实际上确实如此，但它发生在您ImageView方法中定义的SetRecyclerAdaptor()中。
OnResume注释掉上述代码将解决您的问题。