java - WindowLeaked exception right when thread finishes and calls dialog.dissmiss(); -


i have tab layout app needs download few files right when starts, in main.java file in oncreate method call:

  myprogressdialog = progressdialog.show(controller.this,                 "please wait...", "doing extreme calculations...", true);     downloadfile(name_local, name_server, true);

downloadfile separate thread looks likes this:

 protected void downloadfile(final string localfilepath, final string remotefilename, final boolean ascii) {              // fire off thread work shouldn't directly in ui thread              thread = new thread() {                 public void run() {                       logger.setlevel(level.debug);                            try{                             //create client                             log.info("creating client");                             ftp = new filetransferclient();                             log.info("setting remote host");                             ftp.setremotehost(host);                             ftp.setusername(username);                             ftp.setpassword(password);                             //connect. . .we hope                             log.info("connecting server " + host);                             ftp.connect();                             ftp.getadvancedftpsettings().setconnectmode(ftpconnectmode.pasv);                             if(ascii){                             ftp.setcontenttype(ftptransfertype.ascii);                             log.d("ascii", "using ascii");                             }else if(!ascii){                                 log.d("binary", "using binary");                                 ftp.setcontenttype(ftptransfertype.binary);                              }                              ftp.downloadfile(cache + localfilepath , remotefilename);                          }catch (exception e){                             e.printstacktrace();                          }                          mhandler.post(mupdateresults);                     handler handler=new handler();                     handler.post(new runnable(){public void run(){myprogressdialog.dismiss();}});                  }             };             a.start();          }

in log cat starts download, , finishes sudden gives me this:

02-17 17:27:51.175: error/windowmanager(2523): activity org.ire.toolbox.controller has leaked window com.android.internal.policy.impl.phonewindow$decorview@46eba2f0 added here  02-17 17:27:51.175: error/windowmanager(2523): android.view.windowleaked: activity org.ire.toolbox.controller has leaked window com.android.internal.policy.impl.phonewindow$decorview@46eba2f0 added here

whats going on?! in advance!

the code posted going raise exception in thread.run() at:

handler handler=new handler();

the reason thread has not called looper.prepare. saw "force close" prompt , if dig through logs, you'll find like:

error/androidruntime(1161): uncaught handler: thread thread-9 exiting due uncaught exception error/androidruntime(1161): java.lang.runtimeexception: can't create handler inside thread has not called looper.prepare() error/androidruntime(1161):     @ android.os.handler.<init>(handler.java:121)

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