我想创建一个带有部分标题的可扩展列表视图。我尝试了以下示例的两个示例方法，
- CommonsWare 的合并可扩展示例 ( http://bit.ly/gm6roZ )
- Jeff Sharkey ( http://bit.ly/1ayuTq )用标题分隔列表
我设法使用 listView 让这些工作，但是，当我切换到使用 expandableListView 时，我遇到了一些问题：
- 当我尝试实现 Jeff 的方法时，似乎标题恰好有一个指示器并且可点击。当我想到它时，这似乎不对。标题不应该是可扩展列表视图，或者至少不应该表现得像一个。
- 我还注意到，在实现自定义可扩展列表适配器时，我不再具有 IsEnabled() 函数。这可能是我的标题被启用为可扩展列表视图的原因。我认为我可能已被 IsChildSelectable() 取代，但这不是我需要的（启用/禁用组列表）。
我确实在 IRC 频道中问过某人，他们告诉我，我可能会在包装部分遗漏几个步骤，但我不能确定，所以我暂时抛出代码。
（顺便说一句，我使用的是 Xamarin 的 monodroid。但样式和流程或多或少与 android 相同，所以我也了解 android 的代码，所以在这里）
分离的ExpandableAdapter 类
using System;
using System.Collections.Generic;
using Android.Content;
using Android.Views;
using Android.Widget;
using Object = Java.Lang.Object;
namespace AndroidApplication10
{
class SeparatedExpandableListAdapter :BaseExpandableListAdapter
{
public readonly Context context;
public readonly Dictionary<string, IExpandableListAdapter> sections = new Dictionary<string, IExpandableListAdapter>();
public readonly ArrayAdapter<string> headers;
public static readonly int TYPE_SECTION_HEADER = 0;
public SeparatedExpandableListAdapter(Context context)
{
this.context = context;
headers = new ArrayAdapter<string>(context, Resource.Layout.list_header, Resource.Id.list_header_title);
}
//register our adapter with a section.
public void AddSection(string section, IExpandableListAdapter adapter)
{
headers.Add(section);
sections.Add(section, adapter);
}
/*
* Algorithm for separatedList
* ::correctly find the selected item among child adapters::
* - subtract from the original position
* - do logic once the position find the header (position == 0)
* - do logic once the position find the adapter (position < size)
*/
public override Object GetGroup(int groupPosition)
{
foreach (var section in sections)
{
var size = section.Value.GroupCount + 1;
if (groupPosition == 0) return section.Key;
if (groupPosition < size) return section.Value.GetGroup(groupPosition - 1);
groupPosition -= size;
}
return null;
}
public override Object GetChild(int groupPosition, int childPosition)
{
foreach (var section in sections)
{
var size = section.Value.GroupCount + 1;
if (groupPosition == 0) return null;
if (groupPosition < size) return section.Value.GetChild(groupPosition - 1, childPosition);
groupPosition -= size;
}
return null;
}
public override int GroupCount
{
get
{
var total = 0;
foreach (var adapter in sections.Values)
{
total += adapter.GroupCount + 1;
}
return total;
}
}
public override int GetChildrenCount(int groupPosition)
{
foreach (var section in sections)
{
var size = section.Value.GroupCount + 1;
if (groupPosition == 0) return 0;
if (groupPosition < size) return section.Value.GetChildrenCount(groupPosition - 1);
groupPosition -= size;
}
return 0;
}
public override bool IsEmpty
{
get { return true; }
}
public override int GroupTypeCount
{
get
{
var total = 1;
foreach (var adapter in sections.Values)
{
Console.WriteLine("[ROXEZ]: GroupTypeCount? " + ((BaseExpandableListAdapter)adapter).GroupTypeCount);
total += ((BaseExpandableListAdapter) adapter).GroupTypeCount; //?
Console.WriteLine("[ROXEZ]: total? " + total);
}
return total;
}
}
public override int ChildTypeCount
{
get
{
return base.ChildTypeCount;
}
}
public override int GetGroupType(int groupPosition)
{
var type = 1;
foreach (var section in sections)
{
var size = section.Value.GroupCount + 1;
if (groupPosition == 0) return TYPE_SECTION_HEADER;
if (groupPosition < size)
return ((BaseExpandableListAdapter) (section.Value)).GetGroupType(groupPosition);
groupPosition -= size;
type += ((BaseExpandableListAdapter) (section.Value)).GroupTypeCount;
}
return -1;
}
public override int GetChildType(int groupPosition, int childPosition)
{
return base.GetChildType(groupPosition, childPosition);
}
public override bool AreAllItemsEnabled()
{
return false;
}
public override bool IsChildSelectable(int groupPosition, int childPosition)
{
Console.WriteLine("Position: " + groupPosition + " | Output: " + (GetGroupType(groupPosition) != TYPE_SECTION_HEADER));
return (GetGroupType (groupPosition) != TYPE_SECTION_HEADER);
}
public override View GetGroupView(int groupPosition, bool isExpanded, View convertView, ViewGroup parent)
{
var sectionNum = 0;
foreach (var section in sections)
{
var size = section.Value.GroupCount + 1;
if (groupPosition == 0)
{
return headers.GetView(groupPosition, convertView, parent);
}
if (groupPosition < size) return section.Value.GetGroupView(groupPosition - 1, isExpanded, convertView, parent);
groupPosition -= size;
sectionNum++;
}
return null;
}
public override View GetChildView(int groupPosition, int childPosition, bool isLastChild, View convertView, ViewGroup parent)
{
var sectionNum = 0;
foreach (var section in sections)
{
var size = section.Value.GroupCount + 1;
if (groupPosition == 0) return null;
if (groupPosition < size) return section.Value.GetChildView(groupPosition - 1, childPosition, isLastChild, convertView, parent);
groupPosition -= size;
sectionNum++;
}
return null;
}
public override long GetGroupId(int groupPosition)
{
return groupPosition;
}
public override long GetChildId(int groupPosition, int childPosition)
{
return childPosition;
}
public override bool HasStableIds
{
get { return true; }
}
}
}