xml - Android action bar drop-down menu button doesn't show up -


i'm trying menu button show @ 11:41 in tutorial below. https://www.youtube.com/watch?v=bsb2jugxegs?t=11m41s

here's code:

first_layout.xml

    <relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"     android:layout_height="match_parent" android:paddingleft="@dimen/activity_horizontal_margin"     android:paddingright="@dimen/activity_horizontal_margin"     android:paddingtop="@dimen/activity_vertical_margin"     android:paddingbottom="@dimen/activity_vertical_margin" tools:context=".firstactivity"     android:clickable="false">       <textview android:text="@string/hello_world" android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:id="@+id/textview" />  </relativelayout>

styles.xml

<resources>      <!-- base application theme. -->     <style name="apptheme" parent="theme.appcompat.light">         <!-- customize theme here. -->     </style>     </resources>

strings.xml

<resources>     <string name="app_name">firstapp</string>      <string name="hello_world">hello world!</string>     <string name="action_settings">settings</string> </resources>

firstactivity.java 

 package lj.com.firstapp;       import android.os.bundle;     import android.support.v7.app.*;     import android.view.menu;     import android.view.menuitem;       public class firstactivity extends appcompatactivity {          @override         protected void oncreate(bundle savedinstancestate) {             super.oncreate(savedinstancestate);             setcontentview(r.layout.first_layout);          }           @override         public boolean oncreateoptionsmenu(menu menu) {             // inflate menu; adds items action bar if present.             getmenuinflater().inflate(r.menu.menu_first, menu);             return true;         }          @override         public boolean onoptionsitemselected(menuitem item) {             // handle action bar item clicks here. action bar             // automatically handle clicks on home/up button, long             // specify parent activity in androidmanifest.xml.             int id = item.getitemid();              //noinspection simplifiableifstatement             if (id == r.id.action_settings) {                 return true;             }              return super.onoptionsitemselected(item);         }     }

i'm using api 22, not sure if i'm missing or if it's suppose this? http://i.stack.imgur.com/gpysw.png

there no problem apparently. when ran app in emulator toolbar showed suppose to. it's isn't active in android studio preview window.

http://i.stack.imgur.com/aky27.png


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