void StartImageDownload(ListView listView, int position, IIconAndTitleItem audio)
{
if (_imageDownloadsInProgress.Contains(audio.Id))
{
return;
}
var url = new Uri(audio.IconUrl);
if (_imageDownloader.HasLocallyCachedCopy(url))
{
var image = _imageDownloader.GetImage(url);
FinishImageDownload(listView, position, audio, (Bitmap)image);
}
else
{
_imageDownloadsInProgress.Add(audio.Id);
_imageDownloader.GetImageAsync(url).ContinueWith(t =>
{
if (!t.IsFaulted)
{
FinishImageDownload(listView, position, audio, (Bitmap)t.Result);
}
},
TaskScheduler.FromCurrentSynchronizationContext()
);
}
}
void FinishImageDownload(ListView listView, int position, IIconAndTitleItem audio, Bitmap image)
{
_images [audio.Id] = image;
_imageDownloadsInProgress.Remove(audio.Id);
// Locate the the child view and update.
var firstPostion = listView.FirstVisiblePosition - listView.HeaderViewsCount;
var childIndex = position - firstPostion;
if (0 <= childIndex && childIndex < listView.ChildCount)
{
var view = listView.GetChildAt(childIndex);
var imageView = view.FindViewById <ImageView> (Resource.Id.Icon);
imageView.SetImageBitmap(image);
}
}
void StartImageDownload (ListView listView, int position, IIconAndTitleItem audio)
{
if (_imageDownloadsInProgress.Contains (audio.Id))
{
return;
}
var url = new Uri (audio.IconUrl);
if (_imageDownloader.HasLocallyCachedCopy (url))
{
var image = _imageDownloader.GetImage (url);
FinishImageDownload (listView, position, audio, (Bitmap) image);
}
else
{
_imageDownloadsInProgress.Add (audio.Id);
_imageDownloader.GetImageAsync (url).ContinueWith (t =>
{
if (!t.IsFaulted)
{
FinishImageDownload (listView, position, audio, (Bitmap) t.Result);
}
},
TaskScheduler.FromCurrentSynchronizationContext ()
);
}
}
void FinishImageDownload (ListView listView, int position, IIconAndTitleItem audio, Bitmap image)
{
_images [audio.Id] = image;
_imageDownloadsInProgress.Remove (audio.Id);
// Locate the the child view and update.
var firstPostion = listView.FirstVisiblePosition - listView.HeaderViewsCount;
var childIndex = position - firstPostion;
if (0 <= childIndex && childIndex < listView.ChildCount)
{
var view = listView.GetChildAt (childIndex);
var imageView = view.FindViewById<ImageView> (Resource.Id.Icon);
imageView.SetImageBitmap (image);
}
}