performance - IntentService is hanging UI in android -

in intentservice using threadpoolexecutor poolsize 8 , maxpoolsize 10. when ever service started effect on ui. in runtask() method add tasks thread pool.

private threadpoolexecutor threadpool = null; private final linkedblockingqueue<runnable> threadsqueue =   new linkedblockingqueue<runnable>(); private collection<future<?>> futures = new linkedlist<future<?>>();  public myservice(string name) {  super(name);  threadpool = new threadpoolexecutor(poolsize, maxpoolsize, keepalivetime,      timeunit.seconds, threadsqueue); }  public void runtask(runnable task) {   futures.add(threadpool.submit(task)); }  /** * when ever call method hold main thread untill tasks * in thread pool completed. */  public void waitforthreadpool() {  (future<?> future : futures) {    try {      future.get();    } catch (interruptedexception e) {      e.printstacktrace();    } catch (executionexception e) {      e.printstacktrace();    } catch (exception e) {      e.printstacktrace();    }  } } 

i suggest creating separate thread in service (service runs in ui thread) wait executors finish. how done it

@override public int onstartcommand(intent intent, int flags, int startid) {      // check have here     // ...      if (state == state.idle) {         state = state.in_progress;          new thread()         {             @override             public void run()             {                 performandwait();                 stopself();             }         }.start();     }  }  private void performandwait() {      //add tasks executorservice      (string key : this.data.keyset()) {         final job pending = new job(this.context, key, this.data.get(key));         try {             this.service.submit(pending);         } catch (rejectedexecutionexception e) {             // rejected stuff go here next attempt when finishes             this.rejected.add(pending);         }     }      // wait      service.shutdown();     try {         service.awaittermination(3600, timeunit.seconds);     } catch (interruptedexception e) {         e.printstacktrace();     } }