android - Change a preference through a Dialog -

i want change preference in class if user selects 'ok' in output dialog. have implemented method in class:

if (basalcor != basal) {                      fragmentmanager fragmentmanager = getfragmentmanager();                     changebasaldialog dialogo = new changebasaldialog(basal);                     dialogo.show(fragmentmanager, "tagbasal");                     if (dialogo.check == true) {                         string ok= "basal factor changed succesfully";                         sharedpreferences.editor prefseditor = myprefs.edit();                         if (basalmorframe == true) {                             prefseditor.putstring("basalmor", string.valueof(basal));                             prefseditor.commit();                             toast toast=toast.maketext(mymeasures.this, ok, toast.length_short);                             toast.show();                         }                            if (basalniframe == true) {                             prefseditor.putstring("basalni",                                     string.valueof(basal));                             prefseditor.commit();                             toast toast=toast.maketext(mymeasures.this, ok, toast.length_short);                             toast.show();                         }                     }                     } 

and class changebasaldialog:

    public class changebasaldialog extends dialogfragment{      double basal=0;      boolean check=false;      @override         public dialog oncreatedialog(bundle savedinstancestate) {              alertdialog.builder builder =                     new alertdialog.builder(getactivity());              builder.setmessage("the system recommends new basal factor ("+string.valueof(basal)+"). want set new 1 default?")             .settitle("new basal recommendation avaliable")             .setpositivebutton("yes, want", new dialoginterface.onclicklistener()  {                    public void onclick(dialoginterface dialog, int id) {                             check=true;                             dialog.cancel();                        }                    })             .setnegativebutton("no, i'll keep old value", new dialoginterface.onclicklistener() {                    public void onclick(dialoginterface dialog, int id) {                             dialog.cancel();                        }                    });              return builder.create();         }         public changebasaldialog (double a){      basal=a;      } } 

the problem dialogo.check false if press ok, , cannot change preference ever. want make return dialogo.check=true when press ok button i've tried , don't see it. in advance

when this: dialog.cancel(); reset variables.

i recommend use boolean check outside of changebasaldialog (if have changebasaldialog inside activity).

or implement listener dialogfragment, this documented example.