Execute task several times

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Android

In my Activity I use a class which extends from AsyncTask and a parameter which is an instance of that AsyncTask. When I call readRss.execute() everything is fine. But the app crash when I want to update which calls again the readRss.execute(). Cause then appears an Exception which says :

Cannot execute task: the task has already been executed (a task can be executed only once)

I don't want to create new instances of the Asyntask.

public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    recyclerView = (RecyclerView) findViewById(R.id.recyclerview);

    final ReadRss readRss = new ReadRss(this, recyclerView);
readRss.execute();

final SwipeRefreshLayout pullToRefresh = (SwipeRefreshLayout) 
findViewById(R.id.swipe_container);
pullToRefresh.setOnRefreshListener(new 
SwipeRefreshLayout.OnRefreshListener() {
    @Override
    public void onRefresh() {
        readRss.execute(); 
        pullToRefresh.setRefreshing(false);
    }
});


    }
}

}

this ReadRss class :

public class ReadRss extends AsyncTask<Void, Void, Void> {
Context context;
String address = "http://karar.com/XMLFile1.xml";
ProgressDialog progressDialog;
ArrayList<FeedItem> feedItems;
RecyclerView recyclerView;
URL url;

public ReadRss(Context context, RecyclerView recyclerView) {
    this.recyclerView = recyclerView;
    this.context = context;
    progressDialog = new ProgressDialog(context);
    progressDialog.setMessage("loading....");
}


@Override
protected void onPreExecute() {
    progressDialog.show();
    super.onPreExecute();
}

What I have tried:

this work but Idont think this is the right way :
call new ReadRss(this, recyclerView).execute();