public BitmapWorkerTask GetBitmapWorkerTask()
{
BitmapWorkerTask task = null;
bitmapWorkerTaskReference.TryGetTarget(out task);
return(task);
}
public static void StartNew(ImageView imageView, string url, Resources resources)
{
if (CancelPotentialWork(url, imageView))
{
BitmapWorkerTask task = new BitmapWorkerTask(imageView, resources);
AsyncDrawable asyncDrawable =
new AsyncDrawable(resources, null, task);
imageView.SetImageDrawable(asyncDrawable);
task.Execute(url);
}
}
static bool CancelPotentialWork(string url, ImageView imageView)
{
BitmapWorkerTask bitmapWorkerTask = getBitmapWorkerTask(imageView);
if (bitmapWorkerTask != null)
{
string bitmapUrl = bitmapWorkerTask.url;
if (bitmapUrl == "" || bitmapUrl != url)
{
bitmapWorkerTask.Cancel(true);
}
else
{
return(false);
}
}
return(true);
}
protected override void OnPostExecute(Bitmap bitmap)
{
if (IsCancelled)
{
bitmap = null;
}
if (imageViewReference != null && bitmap != null)
{
ImageView imageView = null;
imageViewReference.TryGetTarget(out imageView);
BitmapWorkerTask bitmapWorkerTask =
getBitmapWorkerTask(imageView);
if (this == bitmapWorkerTask && imageView != null)
{
imageView.SetImageDrawable(new BitmapDrawable(bitmap));
}
}
}
public AsyncDrawable(Resources res, Bitmap bitmap, BitmapWorkerTask bitmapWorkerTask) : base(res, bitmap)
{
bitmapWorkerTaskReference =
new WeakReference <BitmapWorkerTask>(bitmapWorkerTask);
}