public override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
RetainInstance = true;
downloaders = new List<Downloader>();
mCallbacks = (TaskCallbacks)Activity;
}
public async Task<bool> StartTaskByTag(string tag, TaskCallbacks callbacks)
{
var selectedDownloader = downloaders.SingleOrDefault(s => s.TAG.Equals(tag));
if (selectedDownloader == null)
{
return false;
}
if(selectedDownloader.IsRunning == false)
{
selectedDownloader.IsRunning = true;
selectedDownloader.CancellationTokenSource = new CancellationTokenSource();
SetUpTask(selectedDownloader);
try
{
selectedDownloader.Result = new List<string>();
await selectedDownloader.Task;
callbacks.OnPostExecute(selectedDownloader.TAG, selectedDownloader.Result);
}
catch (System.OperationCanceledException)
{
callbacks.OnCancelled(selectedDownloader.TAG);
}
catch (Exception e)
{
callbacks.OnFailed(selectedDownloader.TAG);
}
finally
{
selectedDownloader.CancellationTokenSource = null;
selectedDownloader.IsRunning = false;
downloaders.Remove(downloaders.SingleOrDefault(s => s.TAG.Equals(tag)));
}
return true;
}
return false;
}
public override void OnResume()
{
base.OnResume();
mCallbacks = (TaskCallbacks)Activity;
}
