MainActivity.java

    private class MyCustomLongRunningTask extends AsyncTask<Void, Void, Void> {

        private Context mContext;
        private String mUrl;

        public MyCustomLongRunningTask(Context mContext, String mUrl) {
            this.mContext = mContext;
            this.mUrl = mUrl;
        }

        @Override
        protected Void doInBackground(Void... voids) {
            return null;
        }
    }