Back button closes progress dialog, doesn't cancel task

[gradha]

I'm using the BetterAsyncTask with a progress dialog, and when the user presses the back button on the device the progress dialog is dismissed but the task continues running. I've managed to override this implementing the onCreateDialog() method on my activity and attaching there an OnCancelListener, but still it doesn't look too god, because I'm using globals to communicate with the task.

It would be better if the cancel listener flagged the task as cancelled and the task itself could check for this with the isCancelled() method.

[mttkay]

just know that cancel() will just set a flag which does the following:

• if the task has not been started, it won't ever start
• if it's running, it will keep running until it's done (i.e. it will NOT be interrupted), but not post back its result to onPostExecute
• if it's completed, it's a no-op

in other words, it's not particularly useful if what you want to do is actually abort a long running operation.

[Aman-Aalam]

For example, If that long running task is a network activity, wouldn't aborting that long running task save the network bandwidth, which is perhaps actually what the user might have wished when he/she pressed back button to cancel the "progress" ?

[gradha]

The problem I have is that the OnCancelListener doesn't have access to the BetterAsyncTask, so I can't call it's cancel method. I would, but other than using a global for it I don't know how to do it.