java - Why i dont show positiveButton -

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i made alertdialog "positive button" in emulator doesn't show up. what's problem?

    protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         button btndersekle = (button) findviewbyid(r.id.btndersekle);         etders = new edittext(mainactivity.this);         layoutders = (linearlayout) findviewbyid(r.id.layoutders);         alertdialog.builder alertders = new alertdialog.builder(mainactivity.this);         alertders.settitle("ders adi giriniz");         alertders.setview(etders);         final alertdialog alert = alertders.create();          alertders.setpositivebutton("tamam", new dialoginterface.onclicklistener() {              @override             public void onclick(dialoginterface dialog, int which) {                 tvders = new textview(mainactivity.this);                 tvders.settext(etders.gettext().tostring());                 layoutders.addview(tvders);              }         });           btndersekle.setonclicklistener(new onclicklistener() {             @override             public void onclick(view v) {                 alert.show();             }         });       } }

you need setpositivebutton before create alertdialog. try this:

protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         button btndersekle = (button) findviewbyid(r.id.btndersekle);         etders = new edittext(mainactivity.this);         layoutders = (linearlayout) findviewbyid(r.id.layoutders);         alertdialog.builder alertders = new alertdialog.builder(mainactivity.this);         alertders.settitle("ders adi giriniz");         alertders.setview(etders);         alertders.setpositivebutton("tamam", new dialoginterface.onclicklistener() {              @override             public void onclick(dialoginterface dialog, int which) {                 tvders = new textview(mainactivity.this);                 tvders.settext(etders.gettext().tostring());                 layoutders.addview(tvders);              }         });         final alertdialog alert = alertders.create();          btndersekle.setonclicklistener(new onclicklistener() {             @override             public void onclick(view v) {                 alert.show();             }         });     } }

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