Can't stop/restart AsyncTask

Question

Please help. I can restart the AsyncTask. App crashes every time, when second call to updatePoi().

Here is my code:

1. I\'m checking status of task and set

Answer 1

try

return null;

final code

@Override
protected Void doInBackground(Void... voids) {
    Application app = (Application)getApplication();
    Log.d(TAG, "exits count = " + app.getExits().size());

    GeoPoint pointToNavigate = null;

    for (Exit exit : app.getExits()) {

        for (Poi poi : exit.getPoi()) {
            if (isCancelled()){
                return null;
            }
            //some code here
        }
    }

    //small code here
    return null;
}