internal static async Task <StorageItemThumbnail> CreatePhotoThumbnailAsync(StorageFile file)
{
var bmp = await ThumbnailUtils.ExtractThumbnailAsync(await BitmapFactory.DecodeFileAsync(file.Path), 240, 240, ThumnailExtractOptions.None);
MemoryStream stream = new MemoryStream();
await bmp.CompressAsync(Bitmap.CompressFormat.Jpeg, 90, stream);
stream.Seek(0, SeekOrigin.Begin);
return(new StorageItemThumbnail(stream));
}
private async void LoadThumbnail(ViewHolder viewHolder, int position)
{
var content = GetItemAt(position);
var bitmap = await BitmapFactory.DecodeFileAsync(content.Path);
var thumbnail = await ThumbnailUtils.ExtractThumbnailAsync(bitmap, viewHolder.PreviewImage.Width, viewHolder.PreviewImage.Height);
if (position == (int)viewHolder.ItemView.Tag)
{
viewHolder.PreviewImage.SetImageBitmap(thumbnail);
}
}