Dialog Box Android -

i have dialog box login , there option signup , want when clicking on signup option, layout gets changed in same dialog box. here code:-

mydialog =  new dialog(this);    // mydialog.getwindow().getattributes().windowanimations = r.style.dialogslideanim;     ((viewgroup)mydialog.getwindow().getdecorview())     .getchildat(0).startanimation(animationutils.loadanimation(     mainscreenactivity.this,android.r.anim.slide_in_left));     mydialog.setcontentview(r.layout.activity_main);     mydialog.setcancelable(true);     button login = (button) mydialog.findviewbyid(r.id.login_button);  emailaddr = (edittext) mydialog.findviewbyid(r.id.login_username);  password = (edittext) mydialog.findviewbyid(r.id.login_password);  textview tv = (textview) mydialog.findviewbyid(r.id.login_singup);  mydialog.getwindow().setlayout(1050, 900);  mydialog.show();  login.setonclicklistener(new onclicklistener() {     @override    public void onclick(view v)    {        intent intent = new intent(mainscreenactivity.this,homeactivity.class);        startactivity(intent);        overridependingtransition(r.anim.abc_slide_in_bottom, r.anim.abc_slide_out_top);     }     });     tv.setonclicklistener(new onclicklistener() {          @override         public void onclick(view arg0) {           }     });