How to start working on async task in one activity and inform another activity on completion of work in OnBackground

Question

I would like to achieve the following behaviour, but I\'m not sure how:

   1. User start an activity
   2. Activity starts an AsyncTask
   3. After initiating th         


        

Answer 1

You can create interface, pass it to the AsyncTask (in constructor), and then call interface method in onPostExecute..and make your second activity implements this interface..

For example:

Your interface:

public interface OnTaskCompleted {
    void onTaskCompleted();
}

Your second Activity:

public MyActivity implements OnTaskCompleted {
    //your Activity
}

And your AsyncTask:

public YourTask extends AsyncTask { //change Object to required type
    private OnTaskCompleted listener;

    public YourTask(OnTaskCompleted listener) {
        this.listener=listener;
    }

    //required methods

    protected void onPostExecute(Object o) {
        //your stuff
        listener.onTaskCompleted();
    }
}