public static void Download(string url, ImageView imageView, Resources resources, Bitmap placeholder)
{
if(CancelPotentialDownload(url, imageView))
{
var task = new DownloadImageTask(imageView);
var drawable = new AsyncDrawable(resources, placeholder, task);
imageView.SetImageDrawable(drawable);
task.Execute(url);
}
}
public static void Download(string url, ImageView imageView, Resources resources, Bitmap placeholder)
{
if (CancelPotentialDownload(url, imageView))
{
var task = new DownloadImageTask(imageView);
var drawable = new AsyncDrawable(resources, placeholder, task);
imageView.SetImageDrawable(drawable);
task.Execute(url);
}
}
private static bool CancelPotentialDownload(string url, ImageView imageView)
{
DownloadImageTask task = GetTask(imageView);
if (task != null)
{
string bitmapData = task.Url;
if (bitmapData != url)
{
task.Cancel(true);
}
else
{
return(false);
}
}
return(true);
}
protected override void OnPostExecute(Java.Lang.Object result)
{
Bitmap bitmap = result as Bitmap;
if (IsCancelled)
{
bitmap = null;
}
if (imgRef != null && bitmap != null)
{
ImageView img = (ImageView)imgRef.Target;
DownloadImageTask task = BitmapUtils.GetTask(img);
if (this == task && img != null)
{
img.SetImageBitmap(bitmap);
}
}
}
public AsyncDrawable(Resources resources, Bitmap bitmap, DownloadImageTask task)
: base(resources, bitmap)
{
taskRef = new WeakReference(task);
}
public AsyncDrawable(Resources resources, Bitmap bitmap, DownloadImageTask task)
: base(resources, bitmap)
{
taskRef = new WeakReference(task);
}
