Stop AsyncTask in Fragments when Back Button is pressed

Question

i have an activities that host fragments. pressing a button goes from fragment A to fragment B through a FragmentTransaction and the added to the back stack. Now fragment B

Answer 1

Override the onStop() of your fragment and do:

protected void onStop() {
    super.onStop();

    //check the state of the task
    if(task != null && task.getStatus() == Status.RUNNING)
        task.cancel(true);
}