android - activity.finish() is not stopped current activity -

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i have created android apps using async task call web service, when authentication fail, user stop current activity , redirect login page.

my problem when user redirect login page, toast text still showing, toast text under async thread onpostexceute() event.

any solution problem?

in webservice.cs

catch (unauthorizedexception ua) {         log.d(tag, ua.getmessage());         intent intent = new intent(activity, loginactivity.class);         if(condition a){             intent.putextra("toast_text", r.string.a);         }else{             intent.putextra("toast_text", r.string.b);         }         activity.finish();         activity.startactivity(intent); } return null;

then in asynctask.cs

protected jsonarray doinbackground(string... parameters) {              connectivitymanager cm =                 (connectivitymanager) singleformactivity.this.getsystemservice(context.connectivity_service);          networkinfo activenetwork = cm.getactivenetworkinfo();         boolean isconnected = activenetwork != null &&                 activenetwork.isconnectedorconnecting();          if (isconnected) {         }       return null; }  public void onpostexecute(jsonarray result){      if(result != null){      }else{           toast.maketext(something.this, r.string.b, toast.length_long).show();      } }

you can use

create toast 

 toast toast = toast.maketext(getapplicationcontext(), "", toast.length_long);

and before calling finish() cancel toast using below code

 if (toast != null )       toast.cancel();

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