Question

Because if I start an activity, and I launch the threads in the method onResume, the UI of Activity is displayed only when the thread ends?

@Override

protected void onResume() {

    super.onResume();

    processDocuments();

}


private void processDocuments(){
  parser = new Parser(rssDocument.getDocument(),rssDocument.getFeedRSS(), listener);
  Thread processThread = new Thread(parser);
  processThread.start();
}

Answer 1

You need to run the thread in the background using AsyncTask

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

@Override
    protected String doInBackground(void... args) {
    parser = new Parser(rssDocument.getDocument(),rssDocument.getFeedRSS(), listener);
    Thread processThread = new Thread(parser);
    processThread.start();

}
@Override
    protected void onPostExecute(String result) {
        //Set a toast to say finished. You are allowed to update the UI here.
    }

}