How to update text of ui item from AsyncTask?

private class DownloadFilesTask extends AsyncTask<String, Integer, Long> {
    protected Long doInBackground(String... urls) {
        ConnectViaLoginAndPass();
        long i = 10;
        return i;
    }
}
public void ConnectViaLoginAndPass(){
//here I want to textBox.setText("some text for debug");
}

new DownloadFilesTask().execute("unneededurl");