Android 9 Development Cookbook - Third Edition

Canceling the task

To cancel the task, call the cancel method on the object as follows:

< AsyncTask>.cancel(true); 

You will need to have the object instance to access the cancel() method. (We did not save the object in our previous example.) After setting cancel(true), calling isCancelled() in doInBackground() will return true, allowing you to exit a loop. If cancelled, onCancelled() will be called instead of onPostExecute().