Android - multithreading issues when changing activity -

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i have main menu action bar. on create, run thread hits server current status. when complete, thread calls handler kicks off running thread cycles through items , uses handler call change test in actionbar. problem when change views, either android.view.windowleaked or view not attached window manager

here sample code

public class mainmenuactivity extends protectedwithactionbaractivity{     private int status_counter;     private final int result_status_loaded = 2000;     private final int result_show_status = 2001;     private currentstatusmodel currentstatus;      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);          setcontentview(r.layout.mainmenu);          actionbar footerbar = (actionbar)findviewbyid(r.id.footerbar);          footerbar.settitle("currently connected " + preferenceshelper.getcurrentenvironment().name());           status_counter = 0;          statusloadthread.start();     }      thread statusloadthread = new thread()     {         @override         public void run()         {             //set currentstatus data server         }     };      thread statusdisplaythread = new thread()     {         int sleep = 5000;         boolean threaddone = false;          public void done()         {             threaddone = true;         }          @override         public void run()         {             while(true)             {                 //pick message send handler                 //increment status_counter or reset 0 when out of bounds                  try                  {                     sleep(sleep);                 }                  catch (interruptedexception e)                  {                     // todo auto-generated catch block                     e.printstacktrace();                 }             }         }     };  private handler handler = new handler() {     @override     public void handlemessage(message msg) {         switch(msg.what)         {             case result_status_loaded:                 statusdisplaythread.start();                 break;             case result_show_status:                 actionbar footerbar = (actionbar)findviewbyid(r.id.footerbar);                  string message = ((object[])msg.obj)[0].tostring();                 onclicklistener listener = (onclicklistener)((object[])msg.obj)[1];                  footerbar.settitle(message);                     footerbar.setontitleclicklistener(listener);                  break;             case activitybase.result_error:                  break;         }     }     }; }

i'm not sure if i'm doing wrong or if there blatantly obvious missing. needs happen threads need stop time change screens. should use thread.interrupt(); before starting next activity?

asynctasc allows implement doinbackground(), thread can crank away @ task. similar functionality you'd thread.

the real magic happens when override onpreexecute() , onpostexecute(), which both executed on ui thread. should keep getting messages activity not being attached.

edit - answer contains small code example asynctask started.


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