PhotoThumbnail/ApkPreviewHandler/ApkPreviewHandler.cs

using ShellExtensions;
using ShellExtensions.PreviewHandlers;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace ApkPreviewHandler
{
    [ComVisible(true)]
    [ClassInterface(ClassInterfaceType.None)]
    [ProgId("Tsanie.ApkPreviewHandler")]
    [Guid("2b09062a-b853-4e5c-b349-b1f3aa8e063b")]
    [PreviewHandler("ApkPreviewHandler", ".xapk", "{74428040-0d3b-4789-a70f-91582d9a643e}")]
    public class ApkPreviewHandler : WpfPreviewHandler, IPreviewFromFile, IPreviewFromStream
    {
        public ApkPreviewHandler()
        {
            Control = new ApkPreviewPanel();
        }

        private void Populate(Stream stream)
        {
            if (Control is ApkPreviewPanel panel)
            {
                panel.SetLabel($"length: {stream.Length}");
            }
        }

        #region IPreviewFromFile Members

        public void Load(FileInfo info)
        {
            using (var stream = File.OpenRead(info.FullName))
            {
                Populate(stream);
            }
        }

        #endregion

        #region IPreviewFromStream Members

        public void Load(Stream stream)
        {
            using (stream)
            {
                Populate(stream);
            }
        }

        #endregion
    }
}