Android（二十五）：GridView 网格视图

using System.Collections.Generic;
using Android.Content;
using Android.Views;
using Android.Widget;
using Java.Lang;

namespace android_by_csharp.scripts
{
    public class GridInfo
    {
        public readonly int Icon;
        public readonly string Text;

        public GridInfo(int icon, string text)
        {
            Icon = icon;
            Text = text;
        }
    }
    
    public class GridViewAdapter : baseAdapter
    {
        private readonly List _gridInfos;
        private readonly LayoutInflater _context;

        public GridViewAdapter(Context context, List gridInfos)
        {
            _context = LayoutInflater.FromContext(context);
            _gridInfos = gridInfos;
        }

        public override Object GetItem(int position)
        {
            return null;
        }

        public override long GetItemId(int position)
        {
            return position;
        }

        public override View GetView(int position, View convertView, ViewGroup parent)
        {
            convertView ??= _context.Inflate(Resource.Layout.grid_item, parent, false);
            var icon = (ImageView)convertView?.FindViewById(Resource.Id.icon);
            var text = (TextView)convertView?.FindViewById(Resource.Id.text);
            icon?.SetImageResource(_gridInfos[position].Icon);
            if (text != null) text.Text = _gridInfos[position].Text;
            return convertView;
        }

        public override int Count => _gridInfos.Count;
    }
}

var gridView = (GridView)FindViewById(Resource.Id.grid_view);
var list = new List
{
    new GridInfo((int)Resource.Drawable.avatar, "ProsperLee"),
    new GridInfo((int)Resource.Drawable.avatar, "ProsperLee"),
    new GridInfo((int)Resource.Drawable.avatar, "ProsperLee"),
    new GridInfo((int)Resource.Drawable.avatar, "ProsperLee"),
    new GridInfo((int)Resource.Drawable.avatar, "ProsperLee"),
    new GridInfo((int)Resource.Drawable.avatar, "ProsperLee"),
    new GridInfo((int)Resource.Drawable.avatar, "ProsperLee"),
    new GridInfo((int)Resource.Drawable.avatar, "ProsperLee"),
    new GridInfo((int)Resource.Drawable.avatar, "ProsperLee"),
    new GridInfo((int)Resource.Drawable.avatar, "Lee")
};
var gridViewAdapter = new GridViewAdapter(this, list);
if (gridView != null) gridView.Adapter = gridViewAdapter;