sharedpreferences - Android: access SharedPrefernces from non-activity class -

i trying access sharedprefernces non-activity class.

i trying in way:

context applicationcontext = mainactivity.getcontextofapplication(); sharedpreferences prefs =  preferencemanager.getdefaultsharedpreferences(applicationcontext); private int age = prefs.getint("age", 0); private string name = prefs.getstring("name", null); 

but variable age 0, , variable name null.

what doing wrong?

i save sharedpreferences in activity class:

@override public void onclick(view v) {     switch (v.getid())     {         case r.id.savebutton:             savetext();             prefs = getpreferences(mode_private);             int age = prefs.getint("age", 0);             string name = prefs.getstring("name", null);             if(name == null || age <= 0)             {                 toast.maketext(nameage.this, "put name , age",                         toast.length_long).show();             }             else             {                 toast.maketext(nameage.this, age+prefs.getstring("name",                             null), toast.length_long).show();                 intent = new intent(nameage.this, mainactivity.class);                 startactivity(i);                 finish();                 break;             }     } }  private void savetext() {     prefs = getpreferences(mode_private);     sharedpreferences.editor ed = prefs.edit();     ed.putstring(name, nametext.gettext().tostring());     ed.putint(age, integer.parseint(agetext.gettext().tostring()));     ed.commit();  } 

because trying preference default shared preference file while have stored prefernce @ activity context level using getpreferences(mode_private).

if store preference below work

sharedpreferences prefs =  preferencemanager.getdefaultsharedpreferences(applicationcontext); sharedpreferences.editor ed = prefs.edit();     ed.putstring(name, nametext.gettext().tostring());     ed.putint(age, integer.parseint(agetext.gettext().tostring()));     ed.commit();