android - onActivityResult not being called when launching another app -

i trying call app through intent, app called onactivityresult not being called. please me on this? below code:

public class encryptcommandactivity extends activity{  encryptionfactory encryptionfactory = new encryptionfactory();  protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.encrpyt_command_activity);     activitycontexts.setencryptcommandactivitycontext(this);      intent intent = new intent("asd.com.qweapi.main_activity");      bundle bundle = new bundle();      bundle.putint("function", 1006);     bundle.putstring("msg", mqttfactory.getbyid());     intent.putextras(bundle);      startactivityforresult(intent, 0);      finish();  }  @override protected void onactivityresult(int requestcode, int resultcode, intent pdata) {     super.onactivityresult(requestcode,resultcode,pdata);     log.d("encrypt","inside");  //not called     toast.maketext(activitycontexts.getmainactivitycontext(),"encrypt", toast.length_long).show(); //not called  }  } 

you should remove finish() in oncreate() because finish activity , it's no longer exist, since can not fire onactivityresult()