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Xamarin 实现android gridview 多选
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参考文章：http://blog.csdn.net/zhouyuanjing/article/details/8372686
GridView初始化代码：
gridViewStudent = FindViewById<GridView> (Resource.Id.gridViewStudent);
//GridViewAdapter 自定义的Adapter
GridViewAdapter gridAdapter = new GridViewAdapter (this,stu);
//更新图片 使用默认SimpleAdapter，需重写ViewBinder
//adapter.ViewBinder = new ViewBinder ();
gridViewStudent.Adapter = gridAdapter;
//gridView.ChoiceMode = ChoiceMode.MultipleModal;//长按多选多选模式
gridViewStudent.ChoiceMode = ChoiceMode.Multiple;//设置多选模式
//GridMultiChoiceListener自定义监听
gridViewStudent.SetMultiChoiceModeListener (new GridMultiChoiceListener(this));// 设置多选模式监听器
GridViewAdapter 实现：
public class GridViewAdapter:BaseAdapter
{
Context context;
List<Student> data;
//List<int> selected = new List<int>();
public GridViewAdapter(Context c,List<Student> data){
context = c;
this.data = data;
} /*public void SelectedItem(int selected)
{
this.selected.Add (selected);
}*/ public override int Count {
get {
return data.Count;
}
} public override Java.Lang.Object GetItem (int position)
{
return position;
} public override long GetItemId (int position)
{
return position;
} //主要方法
public override View GetView (int position, View convertView, ViewGroup parent)
{
GridItem item; if (convertView == null) {
item = new GridItem (context); item.LayoutParameters = new GridView.LayoutParams (GridView.LayoutParams.WrapContent,
GridView.LayoutParams.WrapContent); } else {
item = convertView as GridItem;
} item.ID.Text = data[position].ID;
item.Name.Text = data [position].Name;
return item; }
}
GetView 为主要操作方法，用来数据显示等。GridItem为自定义类，标识gridview的一个子视图
GridItem 实现;
public class GridItem:RelativeLayout,ICheckable
{
bool _checked; public ImageView HeadImg {
get;
set;
} public ImageView SelectedImg {
get;
set;
} public TextView Name {
get;
set;
}
public TextView ID {
get;
set;
} public GridItem (Context context) : base (context)
{ //从布局文件加载元素
LayoutInflater.From(context).Inflate(Resource.Layout.gridItem,this);
HeadImg = FindViewById<ImageView>(Resource.Id.imageHead);
SelectedImg = FindViewById<ImageView>(Resource.Id.imageSelect);
Name = FindViewById<TextView> (Resource.Id.textStuName);
ID = FindViewById<TextView> (Resource.Id.textStuID);
}
//进行状态切换
public bool Checked {
get {return _checked; }
set {
_checked = value;
SelectedImg.Visibility=value?ViewStates.Visible:ViewStates.Gone;
SetBackgroundDrawable (value ? Resources.GetDrawable (Resource.Drawable.gridBackground) : null);
}
} public void Toggle ()
{
Checked = !_checked;
}
}
GridMultiChoiceListener类实现
//这里继承一下Java.Lang.Object对象，不然要实现C#IDisposable接口
class GridMultiChoiceListener:Java.Lang.Object, GridView.IMultiChoiceModeListener
{
private Context context; public GridMultiChoiceListener(Context context)
{
this.context = context;
} public void OnItemCheckedStateChanged (ActionMode mode, int position, long id, bool isChecked)
{
//mode.Invalidate ();
} public bool OnActionItemClicked (ActionMode mode, IMenuItem item)
{
return true;
} public bool OnCreateActionMode (ActionMode mode, IMenu menu)
{
return true;
} public void OnDestroyActionMode (ActionMode mode)
{ } public bool OnPrepareActionMode (ActionMode mode, IMenu menu)
{
return true;
} }
