java - getSupportActionBar().setDisplayHomeAsUpEnabled(true); throws NullPointerException -


first of all, know question has been asked before, i've spent hour looking through other solutions, - getactionbar() returns null , , none have worked pair of eyes might able something.

navigationdrawer class other classes inherit from:

public class navigationdrawer extends appcompatactivity {  string[] mdrawertitles; drawerlayout mdrawerlayout; listview mdrawerlist; actionbardrawertoggle mdrawertoggle; string activitytitle;  @override protected void oncreate(bundle savedinstancestate) {     this.requestwindowfeature(window.feature_no_title);     super.oncreate(savedinstancestate);     setcontentview(r.layout.navigation_drawer_layout);     toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);     setsupportactionbar(toolbar);      mdrawertitles = getresources().getstringarray(r.array.drawer_array);     mdrawerlayout = (drawerlayout) findviewbyid(r.id.drawer_layout);     mdrawerlist = (listview) findviewbyid(r.id.left_drawer);     activitytitle = gettitle().tostring();      getsupportactionbar().setdisplayhomeasupenabled(true); //here error thrown     getsupportactionbar().sethomebuttonenabled(true);      adddraweritems();     navdrawersetup();  }

mainactiviy extends above:

public class mainactivity extends navigationdrawer {  int[]images={r.drawable.user_manual,r.drawable.tips_tricks, r.drawable.troubleshooting}; integer printer; listview mylistview;  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);     setsupportactionbar(toolbar);     layoutinflater inflater = (layoutinflater) this.getsystemservice(context.layout_inflater_service);     view contentview = inflater.inflate(r.layout.activity_main, null, false);     mdrawerlayout.addview(contentview, 0); }

navigation drawer .xml

<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.drawerlayout     xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/drawer_layout" android:layout_width="match_parent" android:layout_height="match_parent" app:layout_behavior="@string/appbar_scrolling_view_behavior">  <framelayout     android:id="@+id/content_frame"     android:layout_width="match_parent"     android:layout_height="match_parent" />  <listview     android:id="@+id/left_drawer"     android:layout_width="240dp"     android:layout_height="match_parent"     android:layout_gravity="start"     android:background="#999"     android:choicemode="singlechoice"     android:divider="@android:color/transparent"     android:dividerheight="0dp" />   </android.support.v4.widget.drawerlayout>

styles.xml

<resources>  <!-- base application theme. --> <style name="apptheme" parent="theme.appcompat.light.darkactionbar">     <!-- customize theme here. -->     <item name="colorprimary">@color/colorprimary</item>     <item name="colorprimarydark">@color/colorprimarydark</item>     <item name="coloraccent">@color/coloraccent</item> </style>  <style name="apptheme.noactionbar">     <item name="windowactionbar">false</item>     <item name="windownotitle">true</item> </style>  <style name="apptheme.appbaroverlay"  parent="themeoverlay.appcompat.dark.actionbar" />  <style name="apptheme.popupoverlay" parent="themeoverlay.appcompat.light" />  </resources>

activity_main

<?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.coordinatorlayout     xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:fitssystemwindows="true" tools:context="com.example.shelleyd.myapplication.mainactivity">  <android.support.design.widget.appbarlayout     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:theme="@style/apptheme.appbaroverlay">      <android.support.v7.widget.toolbar         android:id="@+id/toolbar"         android:layout_width="match_parent"         android:layout_height="?attr/actionbarsize"         android:background="?attr/colorprimary"         app:popuptheme="@style/apptheme.popupoverlay" />  </android.support.design.widget.appbarlayout>

content_main

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/content_main" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" app:layout_behavior="@string/appbar_scrolling_view_behavior" tools:context="com.example.shelleyd.myapplication.mainactivity" tools:showin="@layout/activity_main">  <listview     android:id="@+id/mylist"     android:layout_width="match_parent"     android:layout_height="0dp"     android:layout_gravity="center_vertical"     android:layout_weight="1" />  </linearlayout>

in navigationdrawer activity performing setcontentview(r.layout.navigation_drawer_layout), , in navigation_drawer_layout there no toolbar, leads exception.


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