java - Showing and hiding SettingsFragment in an activity -

so followed this guide on android developers. suggest use fragments showing settings user.

i created xml , strings , fragment:

public class settingsfragmentapp extends preferencefragment{     @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);          addpreferencesfromresource(r.xml.preferences_app);     } } 

i want show on mainactivity page without creating activity hosts fragment (i think later optioon recommended google kills point...why should create activity fragment?). added option menu , handle in mainactivity:

        //inside onoptionsitemselected(menuitem item)         case (r.id.action_settings_user):             getfragmentmanager().begintransaction().replace(android.r.id.content,                     new settingsfragmentuser()).commit();             return true; 

this way setting fragments shows expected, user hits button application exits because still on mainactivity.

so question how can handle button in such way saves settings changes , brings user mainactivity?

if want button functionality have add fragment stack in transaction.

fragmentmanager manger = getsupportfragmentmanager(); fragmenttransaction transaction = manager.begintransaction(); transaction.replace(r.id.flfragmentcontainer, fragment); transaction.addtobackstack(null); // add fragment stack. transaction.commit(); 

but not recommended. reason suggest use activity can build navigation stack activities instead of fragments. building navigation stack fragments can become problematic quickly. activities supposed container fragments. such in app going have many activities not contain aside fragment , these activities used build navigation stack. in big apps tend write 1 abstract base activity implements base features need , reuse on activity as possible.