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    copied!<p>This is about it (I placed it into Deepsqautter's code). After I tidied up the code, I will place it somewhere handy, or maybe it's a usefull addition to mvvmcross itself...</p> <p>The view:</p> <pre><code>public class BindableExpandableListView : ExpandableListView { public BindableExpandableListView(Context context, IAttributeSet attrs) : this(context, attrs, new BindableExpandableListAdapter(context)) { } public BindableExpandableListView(Context context, IAttributeSet attrs, BindableExpandableListAdapter adapter) : base(context, attrs) { var groupTemplateId = MvxAttributeHelpers.ReadAttributeValue(context, attrs, MvxAndroidBindingResource.Instance .ListViewStylableGroupId, AndroidBindingResource.Instance .BindableListGroupItemTemplateId); var itemTemplateId = MvxAttributeHelpers.ReadListItemTemplateId(context, attrs); SetAdapter(adapter); adapter.GroupTemplateId = groupTemplateId; adapter.ItemTemplateId = itemTemplateId; } // An expandableListView has ExpandableListAdapter as propertyname, but Adapter still exists but is always null. protected BindableExpandableListAdapter ThisAdapter { get { return ExpandableListAdapter as BindableExpandableListAdapter; } } private IEnumerable _itemsSource; [MvxSetToNullAfterBinding] public virtual IEnumerable ItemsSource { get { return ThisAdapter.ItemsSource; } set { ThisAdapter.ItemsSource = value; } } public int ItemTemplateId { get { return ThisAdapter.ItemTemplateId; } set { ThisAdapter.ItemTemplateId = value; } } private ICommand _itemClick; public new ICommand ItemClick { get { return _itemClick; } set { _itemClick = value; if (_itemClick != null) EnsureItemClickOverloaded(); } } public ICommand GroupClick { get; set; } private bool _itemClickOverloaded = false; private void EnsureItemClickOverloaded() { if (_itemClickOverloaded) return; _itemClickOverloaded = true; base.ChildClick += (sender, args) =&gt; ExecuteCommandOnItem(this.ItemClick, args.GroupPosition, args.ChildPosition); } protected virtual void ExecuteCommandOnItem(ICommand command, int groupPosition, int position) { if (command == null) return; var item = ThisAdapter.GetRawItem(groupPosition, position); if (item == null) return; if (!command.CanExecute(item)) return; command.Execute(item); } </code></pre> <p>}</p> <p>and the adapter</p> <pre><code>public class BindableExpandableListAdapter : MvxAdapter, IExpandableListAdapter { private IList _itemsSource; public BindableExpandableListAdapter(Context context) : base(context) { } int groupTemplateId; public int GroupTemplateId { get { return groupTemplateId; } set { if (groupTemplateId == value) return; groupTemplateId = value; // since the template has changed then let's force the list to redisplay by firing NotifyDataSetChanged() if (ItemsSource != null) NotifyDataSetChanged(); } } protected override void SetItemsSource(System.Collections.IEnumerable value) { Mvx.Trace("Setting itemssource"); if (_itemsSource == value) return; var existingObservable = _itemsSource as INotifyCollectionChanged; if (existingObservable != null) existingObservable.CollectionChanged -= OnItemsSourceCollectionChanged; _itemsSource = value as IList; var newObservable = _itemsSource as INotifyCollectionChanged; if (newObservable != null) newObservable.CollectionChanged += OnItemsSourceCollectionChanged; if (value != null) { // dit weggehaald FlattenAndSetSource(value); } else base.SetItemsSource(null); } public int GroupCount { get { return (_itemsSource != null ? _itemsSource.Count : 0); } } public void OnGroupExpanded(int groupPosition) { // do nothing } public void OnGroupCollapsed(int groupPosition) { // do nothing } public bool IsChildSelectable(int groupPosition, int childPosition) { return true; } public View GetGroupView(int groupPosition, bool isExpanded, View convertView, ViewGroup parent) { var item = _itemsSource[groupPosition]; return base.GetBindableView(convertView, item, GroupTemplateId); } public long GetGroupId(int groupPosition) { return groupPosition; } public Java.Lang.Object GetGroup(int groupPosition) { return null; } public long GetCombinedGroupId(long groupId) { return groupId; } public long GetCombinedChildId(long groupId, long childId) { return childId; } public object GetRawItem(int groupPosition, int position) { return ((_itemsSource[groupPosition]) as IEnumerable).Cast&lt;object&gt;().ToList()[position]; } public View GetChildView(int groupPosition, int childPosition, bool isLastChild, View convertView, ViewGroup parent) { var sublist = ((_itemsSource[groupPosition]) as IEnumerable).Cast&lt;object&gt;().ToList(); var item = sublist[childPosition]; return base.GetBindableView(convertView, item, ItemTemplateId); } public int GetChildrenCount(int groupPosition) { return ((_itemsSource[groupPosition]) as IEnumerable).Cast&lt;object&gt;().ToList().Count(); } public long GetChildId(int groupPosition, int childPosition) { return childPosition; } public Java.Lang.Object GetChild(int groupPosition, int childPosition) { return null; } //public object GetRawItem </code></pre> <p>}</p> <p>And example XAML code:</p> <pre><code>&lt;DeapExtensions.Binding.Droid.Views.BindableExpandableListView android:minWidth="25px" android:minHeight="25px" android:id="@+id/toclist" android:layout_width="fill_parent" android:layout_height="fill_parent" local:MvxBind="ItemsSource Chapters; ItemClick ShowCommand" local:MvxItemTemplate="@layout/indextocsectionlistitem" local:GroupItemTemplate="@layout/indextocitem" android:background="@android:color/white" /&gt; </code></pre> <p>And then even some data example (pseudo code):</p> <pre><code>public class SubItem { public String Name {get; set;} } // this is the special part: a chapter does not CONTAIN a sublist, but IS a list of subitems. public class Chapter : List&lt;Subitem&gt; { public String Name {get; set;} } // en some usage code var chapters = new List&lt;Chapter&gt;(); var chapter = new Chapter(){Name = "chap 1"}; chapter.Add(new SubItem(){Name = " 1"}); chapter.Add(new SubItem(){Name = "item 2"}); chapters.Add(chap); </code></pre> <p>This is my MvxBindingAttributes.xml</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;resources&gt; &lt;declare-styleable name="MvxBinding"&gt; &lt;attr name="MvxBind" format="string"/&gt; &lt;attr name="MvxLang" format="string"/&gt; &lt;/declare-styleable&gt; &lt;declare-styleable name="MvxControl"&gt; &lt;attr name="MvxTemplate" format="string"/&gt; &lt;/declare-styleable&gt; &lt;declare-styleable name="MvxListView"&gt; &lt;attr name="MvxItemTemplate" format="string"/&gt; &lt;attr name="MvxDropDownItemTemplate" format="string"/&gt; &lt;attr name="GroupItemTemplate" format="string"/&gt; &lt;/declare-styleable&gt; &lt;item type="id" name="MvxBindingTagUnique"/&gt; &lt;declare-styleable name="MvxImageView"&gt; &lt;attr name="MvxSource" format="string"/&gt; &lt;/declare-styleable&gt; &lt;/resources&gt; </code></pre> <p>BTW: I have only one project left in MvvmCross, the rest has been converted to Xamarin.Forms or even away from Xamarin. So code is not updated anymore.</p>
 

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