java - Settings Activity onCreate() not called -

on pressing settings, plain whit screen, layout not drawn over, set breakpoints check happening. class gets called, oncreate() doesn't called.

here's code -

public class settingsactivity extends appcompatactivity {      @injectview(r.id.settings_toolbar) toolbar toolbar;      @override     public void oncreate(bundle savedinstancestate, persistablebundle persistentstate) {         super.oncreate(savedinstancestate, persistentstate);         setcontentview(r.layout.settings_toolbar);         butterknife.inject(this);         setsupportactionbar(toolbar);         getfragmentmanager().begintransaction().             replace(r.id.content_frame, new mypreferencefragment()).commit();     }      public static class mypreferencefragment extends preferencefragment {         @override         public void oncreate(final bundle savedinstancestate){             super.oncreate(savedinstancestate);             addpreferencesfromresource(r.xml.preferences);          }     } } 

and here's layout file -

<?xml version="1.0" encoding="utf-8"?> <relativelayout     xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:layout_width="match_parent"     android:layout_height="match_parent">      <android.support.v7.widget.toolbar         xmlns:android="http://schemas.android.com/apk/res/android"         android:layout_width="fill_parent"         android:elevation="20dp"         android:id="@+id/settings_toolbar"         android:theme="@style/apptheme.base"         android:layout_height="wrap_content"         android:background="?attr/colorprimary"         android:minheight="?attr/actionbarsize" />      <framelayout         android:id="@+id/content_frame"         android:layout_below="@+id/settings_toolbar"         android:layout_width="match_parent"         android:layout_height="match_parent" />  </relativelayout> 

try use

protected void oncreate(bundle savedinstancestate) 

instead of

public void oncreate(bundle savedinstancestate, persistablebundle persistentstate)