Android Dialog Showing in 2 activities instead of one -

i relatively new android studio , have problem dialog box. want display dialog box once after application installed in profile_activity. shows in main activity afterwards , believe has context in mainactivity passing context of static class. here's code i`d appreciate if explain why , if there's way fix this. mainactivity extends profile_activity:

public class mainactivity extends profile_activity { private static context mcontext; @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     mcontext = this.getapplicationcontext();     //---setting property greeting message , styling bit---//     textview textout;     textout = (textview) findviewbyid(r.id.textview2);     textout.settextcolor(color.parsecolor("#ffffff"));     textout.setgravity(gravity.center);     textout.settextsize(getresources().getdimension(r.dimen.textsize));     textout.settypeface(null, typeface.bold_italic);     textout.settext("hello " + edittext.gettext() + ", pick 1 of zodiac symbols below " +             "to find out stars holding today!");     //---initiallize properties of buttons used in main activity page ---/     imagebutton aquabutton;     aquabutton = (imagebutton) findviewbyid(r.id.baquarius);     imagebutton piscesbutton;     piscesbutton = (imagebutton) findviewbyid(r.id.bpisces);     imagebutton ariesbutton;     ariesbutton = (imagebutton) findviewbyid(r.id.baries);     imagebutton taurusbutton;     taurusbutton = (imagebutton) findviewbyid(r.id.btaurs);     imagebutton geminibutton;     geminibutton = (imagebutton) findviewbyid(r.id.bgemini);     imagebutton cancerbutton;     cancerbutton = (imagebutton) findviewbyid(r.id.bcancer);     imagebutton leobutton;     leobutton = (imagebutton) findviewbyid(r.id.bleo);     imagebutton virgobutton;     virgobutton = (imagebutton) findviewbyid(r.id.bvirgo);     imagebutton librabutton;     librabutton = (imagebutton) findviewbyid(r.id.blibra);     imagebutton scorpiobutton;     scorpiobutton = (imagebutton) findviewbyid(r.id.bscorpio);     imagebutton sagittariusbutton;     sagittariusbutton = (imagebutton) findviewbyid(r.id.bsagittarius);     imagebutton capributton;     capributton = (imagebutton) findviewbyid(r.id.bcapricorn);      //---setting actions each button when pressed---/      aquabutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             intent aquaactivity = new intent(mainactivity.this,                     aqua_activity.class);             startactivity(aquaactivity);         }     });     piscesbutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             intent piscesactivity = new intent(mainactivity.this,                     pisces_activity.class);             startactivity(piscesactivity);         }     });     ariesbutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             intent ariesactivity = new intent(mainactivity.this,                     aries_activity.class);             startactivity(ariesactivity);         }     });     taurusbutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             intent taurusactivity = new intent(mainactivity.this,                     taurus_activity.class);             startactivity(taurusactivity);         }     });     geminibutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             intent geminiactivity = new intent(mainactivity.this,                     gemini_activity.class);             startactivity(geminiactivity);         }     });     cancerbutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             intent canceractivity = new intent(mainactivity.this,                     cancer_activity.class);             startactivity(canceractivity);         }     });     leobutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             intent leoactivity = new intent(mainactivity.this,                     leo_activity.class);             startactivity(leoactivity);         }     });     virgobutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             intent virgoactivity = new intent(mainactivity.this,                     virgo_activity.class);             startactivity(virgoactivity);         }     });     librabutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             intent libraactivity = new intent(mainactivity.this,                     libra_activity.class);             startactivity(libraactivity);         }     });     scorpiobutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             intent scorpioactivity = new intent(mainactivity.this,                     scorpio_activity.class);             startactivity(scorpioactivity);         }     });     sagittariusbutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             intent sagittactivity = new intent(mainactivity.this,                     sagittarius_activity.class);             startactivity(sagittactivity);         }     });     capributton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             intent capriactivity = new intent(mainactivity.this,                     capricorn_activity.class);             startactivity(capriactivity);         }     });   } //--initializing static methods navigation--// private static void gotocapriact() {     intent capriacti = new intent(mcontext, capricorn_activity.class);     mcontext.startactivity(capriacti); } private static void gotoaquaact() {     intent aquaacti = new intent(mcontext, aqua_activity.class);     mcontext.startactivity(aquaacti); } private static void gotopiscact() {     intent piscacti = new intent(mcontext, pisces_activity.class);     mcontext.startactivity(piscacti); } private static void gotoariesact() {     intent ariesacti = new intent(mcontext, aries_activity.class);     mcontext.startactivity(ariesacti); } private static void gototauract() {     intent taursacti = new intent(mcontext, taurus_activity.class);     mcontext.startactivity(taursacti); } private static void gotogeminiact() {     intent geminiacti = new intent(mcontext, gemini_activity.class);     mcontext.startactivity(geminiacti); } private static void gotocancact() {     intent cancacti = new intent(mcontext, cancer_activity.class);     mcontext.startactivity(cancacti); } private static void gotoleoact() {     intent leoacti = new intent(mcontext, leo_activity.class);     mcontext.startactivity(leoacti); } private static void gotovirgoact() {     intent virgoacti = new intent(mcontext, virgo_activity.class);     mcontext.startactivity(virgoacti); } private static void gotolibraact() {     intent libraacti = new intent(mcontext, libra_activity.class);     mcontext.startactivity(libraacti); } private static void gotoscorpact() {     intent scorpacti = new intent(mcontext, scorpio_activity.class);     mcontext.startactivity(scorpacti); } private static void gotosaggact() {     intent saggacti = new intent(mcontext, sagittarius_activity.class);     mcontext.startactivity(saggacti); }  //--setting datepickerfragment--// public static class datepickerfragment extends dialogfragment         implements datepickerdialog.ondatesetlistener {     calendar mycalendar = calendar.getinstance();      @override     public dialog oncreatedialog(bundle savedinstancestate) {         // use current date default date in picker          int year = mycalendar.get(calendar.year);         int month = mycalendar.get(calendar.month);         int day = mycalendar.get(calendar.day_of_month);          // create new instance o f datepickerdialog , return         int theme;         if (build.version.sdk_int < 23) theme = alertdialog.theme_holo_dark;         else theme = android.r.style.theme_holo_dialog;         return new datepickerdialog(getactivity(), theme, this, year, month, day);      }      //--checks every single sign , navigation--//     string message;     public void ondateset(datepicker view, int year, int month, int day) {         // date chosen user         month = month + 1;         if ((month == 12 && day >= 22 && day <= 31) || (month == 1 && day >= 1 && day <= 19)){             gotocapriact();             }         else if ((month == 1 && day >= 20 && day <= 31) || (month == 2 && day >= 1 && day <= 17)){             gotoaquaact();         }         else if ((month == 2 && day >= 18 && day <= 29) || (month == 3 && day >= 1 && day <= 19)) {             gotopiscact();         }         else if ((month == 3 && day >= 20 && day <= 31) || (month == 4 && day >= 1 && day <= 19)) {             gotoariesact();         }         else if ((month == 4 && day >= 20 && day <= 30) || (month == 5 && day >= 1 && day <= 20)) {             gototauract();         }         else if ((month == 5 && day >= 21 && day <= 31) || (month == 6 && day >= 1 && day <= 20)) {             gotogeminiact();         }         else if ((month == 6 && day >= 21 && day <= 30) || (month == 7 && day >= 1 && day <= 22)) {             gotocancact();         }         else if ((month == 7 && day >= 23 && day <= 31) || (month == 8 && day >= 1 && day <= 22)) {             gotoleoact();         }         else if ((month == 8 && day >= 23 && day <= 31) || (month == 9 && day >= 1 && day <= 22)) {             gotovirgoact();         }         else if ((month == 9 && day >= 23 && day <= 30) || (month == 10 && day >= 1 && day <= 22)) {             gotolibraact();         }         else if ((month == 10 && day >= 23 && day <= 31) || (month == 11 && day >= 1 && day <= 21)) {             gotoscorpact();}         else if ((month == 11 && day >= 22 && day <= 30) || (month == 12 && day >= 1 && day <= 21)) {             gotosaggact();}         else         {   system.out.println("illegal date");}         toast toast = toast.maketext(getcontext(), message, toast.length_short);         toast.show();     } }  public void showdatepickerdialog(view v) {     dialogfragment newfragment = new mainactivity.datepickerfragment();     newfragment.show(getsupportfragmentmanager(), "datepicker"); }  public view.onclicklistener exitbuttonlitener = new view.onclicklistener() {     public void onclick(view v) {         notificationcall();         finish();         system.exit(0);     } }; public view.onclicklistener aboutbuttonlistener = new view.onclicklistener() {     public void onclick(view v) {         intent about_activity = new intent(mainactivity.this,                 aboutactivity.class);         startactivity(about_activity);     } };  public void maketag(string tag) {     string or = savedname.getstring(tag, null);     sharedpreferences.editor preferenceseditor = savedname.edit();     preferenceseditor.putstring("tag", tag);     preferenceseditor.apply(); }  public view.onclicklistener savebuttonlistener = new view.onclicklistener() {     public void onclick(view v) {         //---setting requirements edittext property---//         if (edittext.gettext().length() > 0) {             maketag(edittext.gettext().tostring());             ((inputmethodmanager) getsystemservice(context.input_method_service))                     .hidesoftinputfromwindow(edittext.getwindowtoken(), 0);             intent main_activity = new intent(mainactivity.this,                     mainactivity.class);             startactivity(main_activity);         }       } };} 

and here profile_activity:

public class profile_activity extends appcompatactivity { //---setting public proerty variables inherited in main activity---// private context cnt; private string m_text = ""; public edittext edittext; sharedpreferences savedname;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_profile_activity);     cnt = this;      if(isfirsttime()){     alertdialog.builder builder = new alertdialog.builder(profile_activity.this);     builder.settitle("title");      // set input    final edittext input = new edittext(cnt);     // specify type of input expected; this, example, sets input password, , mask text     input.setinputtype(inputtype.type_text_variation_person_name);    builder.setview(input);      // set buttons     builder.setpositivebutton("ok", new dialoginterface.onclicklistener() {         @override         public void onclick(dialoginterface dialog, int which) {             m_text = input.gettext().tostring();         }     });     builder.setnegativebutton("cancel", new dialoginterface.onclicklistener() {         @override         public void onclick(dialoginterface dialog, int which) {            dialog.cancel();         }     });      builder.show();}      //---initiallizing properties used in profile activity---//     edittext = (edittext) findviewbyid(r.id.name);     savedname = getsharedpreferences("notes", mode_private);     imagebutton btn1 = (imagebutton) findviewbyid(r.id.btn1);     imagebutton btn2 = (imagebutton) findviewbyid(r.id.btn2);     imagebutton btn3 = (imagebutton) findviewbyid(r.id.btn3);      edittext.settext(savedname.getstring("tag",null));     //---initiallizing functions each button--//     btn1.setonclicklistener(savebuttonlistener);     btn2.setonclicklistener(aboutbuttonlistener);     btn3.setonclicklistener(exitbuttonlitener);   } //---creating public function notifications---//  public void notificationcall(){     //---setting parameters notification---//     notificationcompat.builder notifbuilder = (notificationcompat.builder) new notificationcompat.builder(this)             .setdefaults(notificationcompat.default_all)             .setsmallicon(r.drawable.notificaion_icon)             .setticker("alert new message")             .setcontenttitle("goodbye!")             .setcontenttext("it nice having today! come tomorrow new horoscope!")             .setautocancel(true);     //---giving funcionality notification---//     intent resultintent = new intent(this, mainactivity.class);     //---back stack supporting navigation of notification---//     taskstackbuilder stackbuilder = taskstackbuilder.create(this);     stackbuilder.addparentstack(mainactivity.class);     stackbuilder.addnextintent(resultintent);     pendingintent resultpendingintent =             stackbuilder.getpendingintent(                     0,                     pendingintent.flag_update_current             );     notifbuilder.setcontentintent(resultpendingintent);     //---building application---//     notificationmanager notificationmanager = (notificationmanager) getsystemservice(context.notification_service);     notificationmanager.notify(1, notifbuilder.build());   }  private boolean isfirsttime() {     sharedpreferences preferences = getpreferences(mode_private);     boolean ranbefore = preferences.getboolean("ranbefore", false);     if (!ranbefore) {         // first time         sharedpreferences.editor editor = preferences.edit();         editor.putboolean("ranbefore", true);         editor.apply();     }     return !ranbefore; }         public view.onclicklistener exitbuttonlitener = new view.onclicklistener(){                 public void onclick(view v){                     notificationcall();                     finish();                     system.exit(0);                 }         };         public view.onclicklistener aboutbuttonlistener = new view.onclicklistener(){                 public void onclick(view v){                     intent about_activity = new intent (profile_activity.this,                             aboutactivity.class);                     startactivity(about_activity);                 }         };         public void maketag(string tag){             string or = savedname.getstring(tag, null);             sharedpreferences.editor preferenceseditor = savedname.edit();             preferenceseditor.putstring("tag",tag);             preferenceseditor.apply();         }          public view.onclicklistener savebuttonlistener = new view.onclicklistener(){             public void onclick(view v) {                 //---setting requirements edittext property---//                 if (edittext.gettext().length()>0){                     maketag(edittext.gettext().tostring());                     ((inputmethodmanager) getsystemservice(context.input_method_service))                             .hidesoftinputfromwindow(edittext.getwindowtoken(),0);                 intent main_activity = new intent(profile_activity.this,                     mainactivity.class);                 startactivity(main_activity);         }        } }; 

in mainactivity class inside oncreate() method have super.oncreate() call. when profile_activity called it's oncreate() gets executed once, comes call mainactivity call. that's why getting 2 dialog boxes instead of once. because of alertdialog.builder object.show() inside profile_activity oncreate().

so if remove super call mainactivity's oncrreate(), should resolve problem.