create limited instances of AsyncTask

Question

I am fetching user's location in a service, that implements LocationListener. And in OnlocationChanged() method, I am creating an instance of asynctask class that will upload the values to an online database. The problem is that, as soon as the OnlocationChanged() method is called by Listener, a new instance of asynctask is created and it slows down the device. I want a method/mechanism to limit the instances of asynctask to at most 5.

Answer 1

It's quite similar to Thread Pools in java (here).

public class MaxAsyncHandler {

 private static MaxAsyncHandler instance = new MaxAsyncHandler();
 ArrayList<Data> list;
 int count;
 int MAX = 5;


 private MaxAsyncHandler() {
  this.count = 0;
  list = new ArrayList<Data>();
 }

 public int getCount() { return count; }

 public int incCount() { count++; }

 public static MaxAsyncHandler getInstance()
 {  
   return instance;
 }

 public void createTask(Data data) {
  if(count < MAX) 
     new AsyncTask(data); // 
  else
     list.add(data);
 }

 // Call this method when an AsyncTask finishes
 public void checkPool() {
  if(list.size() > 0)
    new AsyncTask(list.get(0)); //
 }
}

PS : I used a singleton pattern.