Asynctask: pass two or more values from doInBackground to onPostExecute

Question

I have an Asynctask which retrieves two int vaules and i want to pass them to onPostExecute to show them on the view.
Here is my code:

    public class QueryServer extends AsyncTask <String, Void, Integer> {       protected Integer doInBackground(String... serverAddress) {         Log.d("QueryServer", ""+serverAddress[0]);         MCQuery mcQuery = new MCQuery("" + serverAddress[0] ,25565);         QueryResponse response = mcQuery.basicStat();          int Onlineplayers = response.getOnlinePlayers(); //first vaule         int Maxplayers = response.getMaxPlayers();  //second vaule          Log.d("MCQuery", "" + Onlineplayers + " OnlinePlayers");         return Onlineplayers;      }      protected void onPostExecute(Integer Onlineplayers){          TextView onlinePlayersView = (TextView) findViewById(R.id.online_players);          onlinePlayersView.setText(""+Onlineplayers+"/"+ Maxplayers); //i need to pass Maxplayers to use it here       } 

Thank you in advance.

Answer 1

You can define a Wrapper class that holds two integers:

public class Wrapper {     public int onlinePlayers;     public int maxPlayers; } 

and use it in place of Integer:

public class QueryServer extends AsyncTask<String, Void, Wrapper> {       protected Wrapper doInBackground(String... serverAddress) {         Log.d("QueryServer", ""+serverAddress[0]);         MCQuery mcQuery = new MCQuery("" + serverAddress[0] ,25565);         QueryResponse response = mcQuery.basicStat();          int onlinePlayers = response.getOnlinePlayers(); //first vaule         int maxPlayers = response.getMaxPlayers();  //second vaule          Log.d("MCQuery", "" + onlinePlayers + " onlinePlayers");         Wrapper w = new Wrapper();         w.onlinePlayers = onlinePlayers;         w.maxPlayers = maxPlayers;         return w;      }      protected void onPostExecute(Wrapper w){          TextView onlinePlayersView = (TextView) findViewById(R.id.online_players);          onlinePlayersView.setText(""+w.onlinePlayers+"/"+ w.maxPlayers); //i need to pass Maxplayers to use it here       } 

Answer 2

public class QueryServer extends AsyncTask <String, Void, Integer>{...} 

Replace the Integer generic param to ArrayList<Integer> or to Integer[]

This way your doInBackground() will look like this:

protected Integer[] doInBackground(String... serverAddress)  {     ...do what you need to do...     //Then create an array, fill with data, and return.     Integer[] arr = new Integer[10];     for(int i=0; i<10; i++)         arr[i] = i; //just an example     return arr; } 

And the in your onPostExecute()

protected void onPostExecute(Integer [] Onlineplayers) {     //Do whatever you want with your array }