android - how to prevent navigation to previous screen and show exit confirm message on back button tap -

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i creating quiz app in witch: when use choose answer user navigate next screen.

what want begins here:

i want prevent user go previous screen,

if user try go previous screen taping button, exit confirm message should appear.

if user choose "ok" app should close , if user choose "cancel / (continue quiz)" app should continue current screen.

you need override in activity onbackpressed in way

    @override public void onbackpressed() {     alertdialog dlg = new alertdialog.builder(youractivity.this).create();     dlg.setcancelable(false);     dlg.settitle("close");     dlg.setmessage("are sure?");     dlg.setbutton(dialoginterface.button_negative, "cancel", new dialoginterface.onclicklistener() {         public void onclick(dialoginterface dialog, int which) {             dialog.cancel();         }     });      dlg.setbutton(dialoginterface.button_positive, "close app", new dialoginterface.onclicklistener() {         public void onclick(dialoginterface dialog, int which) {             youractivity.super.onbackpressed();         }     });      dlg.show(); }

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