CODEWITHSUNDEEP
xamarin.android
Scott Nimrod
Scott Nimrod

Reputation: 11595

Why isn't my ListView ItemClick event being triggered?

Why doesn't my ItemClick event trigger?

_specialtyListView.ItemClick += (s, e) => _viewModel.Specialty = (string)_specialtyListView.Adapter.GetItem((int)e.Id);

NOTE:

  1. The listview is populated.
  2. Items receive focus.

However, I just cannot get the itemclick event to trigger.

I have the following initialization code for my ListView:

_specialtyListView = FindViewById<ListView>(Resource.Id.SpecialtyListView);
_specialtyListView.ChoiceMode = ChoiceMode.Single;
_viewModel.LoadSpecialties();
_specialtyListView.Adapter = new SpecialtiesAdapter(this, new List<string>(_viewModel.Specialties));
_specialtyListView.ItemClick += (s, e) => _viewModel.Specialty = (string)_specialtyListView.Adapter.GetItem((int)e.Id);

I then have the following ListViewItem layout:

 <ListView
        android:id="@+id/SpecialtyListView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:layout_marginTop="5dp"
        android:background="@android:color/transparent"
        android:cacheColorHint="@android:color/transparent"
        android:divider="#CCCCCC"
        android:dividerHeight="1dp"
        android:paddingLeft="2dp" />

Here's the Layout for my ListItem:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <TextView
        android:id="@+id/ProviderSpecialty"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="14sp" />
</LinearLayout>

Upvotes: 0

Views: 56

Answers (2)

Scott Nimrod
Scott Nimrod

Reputation: 11595

There's a bug where the breakpoint will NOT be triggered when the code is NOT wrapped in between braces:

listview.ItemClick += (s, e) => selectedItem = listview.GetItemAtPosition(e.Position).ToString();

To observe the breakpoint, I had to format the code as the following:

listview.ItemClick += (s, e) =>
    {
        selectedItem = listview.GetItemAtPosition(e.Position).ToString();
    };

Upvotes: 0

Cheesebaron
Cheesebaron

Reputation: 24460

I suggest you switch to RecyclerView as it is has better memory handling; you can make updates to single items instead of being forced to update them all.

Anyways, I can't reproduce your issue locally. I did the following:

var listView = FindViewById<ListView>(Resource.Id.listview);
listView.ChoiceMode = ChoiceMode.Single;
listView.ItemClick += (s, e) =>
{
    System.Diagnostics.Debug.WriteLine($"Clicked {e.Position}");
};

var items = new string[] { "Havarti", "Brie", "Cheddar", "Muenster", "Swiss" };
var adapter = new ArrayAdapter<string>(this, Android.Resource.Layout.SimpleListItem1, items);
listView.Adapter = adapter;

I used the exact same layout as you posted. The ItemClick handler is hit consistently.

Upvotes: 1

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