Question

When I log in into my app, an async task starts executing and while that task is being executed and I logout of app, that task is still running and give me the results after sometime(though I have logged out). I want to ask, is there any way to cancel that task so that it doesn’t give me results?

  class AsyncClass extends AsyncTask<>{

    @Override
     protected String doInBackground(Void... params)
      {
             if(isCancelled())
               {
                Log.d("isCancelled", iscancelled());
               }
          //call the webservice

      }
    }

Now there is some other class from where I’m calling

if(asyncTaskObject!=null){
    asyncTaskObject.cancel(true);
        asyncTaskObject=null;
}

But Log statement inside iscancelled() is never called.

Answer 1

I had the same problem just a day ago 🙂

A mixture of the 3 other answers that works for me.

First declare your asyncTask on a field:

private MyTaskClass miTask;

On the onCreate/onResume if an activity:

miTask = new MyTaskClass();

Then you can execute it in any method.

miTask.execute();

And in the onPause/onStop:

miTask.cancel(true);

This will only work if in your doInBackground you check isCancelled(), an example that i made for a cursor access that was already close if the fragment was dismissed:

@Override
    protected Void doInBackground(Void... params) {
        cached = true;
        int idIndex = currentCursor.getColumnIndex(Contacts._ID);
        int displayNameIndex = currentCursor
                .getColumnIndex(Contacts.DISPLAY_NAME);

        while (currentCursor.moveToNext()) {
            if (isCancelled()) {
                break;
            }

Hope that helps, regards.
Alex