title: Google Play services Task API: can a Task be cancelled
body: <p>When use <a href="https://developers.google.com/android/reference/com/google/android/gms/tasks/Tasks.html#call(java.util.concurrent.Callable&lt;TResult&gt;)" rel="nofollow noreferrer">Tasks.call(Callable)</a>, can I cancel it, and remove all the listeners from the task? </p>