ExpandableListView Mono for Android
本文关键字:Android for Mono ExpandableListView | 更新日期: 2023-09-27 18:19:07
我试图做这个例子http://techdroid.kbeanie.com/2010/09/expandablelistview-on-android.html,但使用monodroid,我的问题是,我习惯在java中编程,但我有问题调用BaseExpandableListAdapter Abstracs方法上的子列表,因为我需要例如把groupPosition和childPosition从列表中,所以我怎么能解决这个问题?
创建ExpandableListAdapter
的问题是,这些方法要求您返回Java.Lnag.Object.
的类型,我无法让您的java示例工作。
但是这里有一个使用ExpandableListView
而不定义自己的ExpandableListAdapter
而只是使用SimpleExpandableListAdapter
类的例子。
这个例子将使您能够使用ExpandableListView
,但是它不会给您BaseExpandableListAdapter
带来的额外灵活性。
using System;
using System.Collections.Generic;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
namespace Scratch.ExpandableListActivity
{
[Activity (Label = "Scratch.ExpandableListActivity", MainLauncher = true)]
public class Activity1 : Android.App.ExpandableListActivity
{
IExpandableListAdapter mAdapter;
const string Name = "NAME";
const string IsEven = "IS_EVEN";
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
using (var groupData = new JavaList<IDictionary<string, object>> ())
using (var childData = new JavaList<IList<IDictionary<string, object>>> ()) {
for (int i = 0; i < 20; i++) {
using (var curGroupMap = new JavaDictionary<string, object>()) {
groupData.Add(curGroupMap);
curGroupMap.Add(Name, "Group " + i);
curGroupMap.Add(IsEven, (i % 2 == 0) ? "This group is even" : "This group is odd");
using (var children = new JavaList<IDictionary<string, object>> ()) {
for ( int j = 0; j < 15; j++) {
using (var curChildMap = new JavaDictionary<string, object> ()) {
children.Add(curChildMap);
curChildMap.Add(Name, "Child " + j);
curChildMap.Add(IsEven, (j % 2 == 0) ? "This child is even" : "This child is odd");
}
}
childData.Add(children);
}
}
}
// Set up our adapter
mAdapter = new SimpleExpandableListAdapter (
this,
groupData,
Android.Resource.Layout.SimpleExpandableListItem1,
new string[] { Name, IsEven},
new int[] { Android.Resource.Id.Text1, Android.Resource.Id.Text2 },
childData,
Android.Resource.Layout.SimpleExpandableListItem2,
new string[] { Name, IsEven },
new int[] { Android.Resource.Id.Text1, Android.Resource.Id.Text2 }
);
SetListAdapter(mAdapter);
}
}
}
}
当在Android 4.2(如4.0.6)版本之前使用Mono时,它应该是这样的:
using System;
using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using System.Collections.Generic;
namespace MonoAndroidApplication2
{
[Activity(Label = "Expandable List Activity", MainLauncher = true )]
public class Activity1 : ExpandableListActivity
{
IExpandableListAdapter mAdapter;
String NAME = "NAME";
String IS_EVEN = "IS_EVEN";
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
List< IDictionary <String , object >> groupData = new List< IDictionary < string , object >>();
List< IList<IDictionary< String, object>>> childData = new List < IList < IDictionary < string, object>>>();
for ( int i = 0; i < 20; i++)
{
Dictionary< String, object > curGroupMap = new Dictionary < string , object >();
groupData.Add(curGroupMap);
curGroupMap.Add(NAME, "Group " + i);
curGroupMap.Add(IS_EVEN, (i % 2 == 0) ? "This group is even" : "This group is odd");
List< IDictionary <String , object >> children = new List< IDictionary < string , object >>();
for ( int j = 0; j < 15; j++)
{
Dictionary< String, object > curChildMap = new Dictionary < string , object >();
children.Add(curChildMap);
curChildMap.Add(NAME, "Child " + j);
curChildMap.Add(IS_EVEN, (j % 2 == 0) ? "This child is even" : "This child is odd");
}
childData.Add(children);
}
// Set up our adapter
mAdapter = new SimpleExpandableListAdapter (
this,
groupData,
Android.Resource.Layout.SimpleExpandableListItem1,
new String[] { NAME, IS_EVEN },
new int[] { Android.Resource.Id.Text1, Android.Resource.Id.Text2 },
childData,
Android. Resource. Layout.SimpleExpandableListItem2,
new String[] { NAME, IS_EVEN },
new int[] { Android.Resource .Id.Text1, Android.Resource.Id.Text2 }
);
SetListAdapter(mAdapter);
}
}
}
感谢作者,lanks.