java - menu layout for the navigation menu is not showing up in the navigation drawer -

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it's hard figure out problem because there no syntax errors. i'm able slide navigation menu, menu layout not working.

here's code.

activity_main.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:layout_width="match_parent"     android:layout_height="match_parent"     tools:context="com.example.isaacdixon.pro3.mainactivity">       <linearlayout         android:layout_height="match_parent"         android:layout_width="match_parent"         android:orientation="vertical"         >         <include             android:layout_height="wrap_content"             android:layout_width="match_parent"             layout="@layout/toolbar_layout"                 />     </linearlayout>      <android.support.design.widget.navigationview         android:layout_width="match_parent"         android:layout_height="match_parent"         android:id="@+id/navigation_view"         android:layout_gravity="start"         app:menu="@menu/drawer_menu"         />  </android.support.v4.widget.drawerlayout>

mainactivity.java

package com.example.isaacdixon.pro3;  import android.support.v7.app.appcompatactivity; import android.os.bundle; import android.support.v7.widget.toolbar;  public class mainactivity extends appcompatactivity {     toolbar toolbar;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         toolbar = (toolbar)findviewbyid(r.id.toolbar);         setsupportactionbar(toolbar);     } }

drawer_menu.xml

<?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android">      <group android:checkablebehavior="single">          <items             android:id="@+id/home_id"             android:title="home"             android:icon="@drawable/glass"                 ></items>         <items             android:id="@+id/messege_id"             android:title="messege"             android:icon="@drawable/draw"             ></items>         <items             android:id="@+id/setting_id"             android:title="setting"             android:icon="@drawable/settings"             ></items>     </group>         <item android:title="social">             <menu>                 <items                     android:id="@+id/facebook_id"                     android:title="facebook"                     android:icon="@drawable/facebook"                     >                 </items>                 <items                     android:id="@+id/twiter_id"                     android:title="twiter"                     android:icon="@drawable/twitter"                     >                 </items>             </menu>         </item> </menu>

problem items.

just edit menu below. 

<?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android">      <group android:checkablebehavior="single">         <item             android:id="@+id/..."             android:icon="@android:drawable/..."             android:title=.../>         <item             android:id="@+id/...             android:icon="@android:drawable/..."             android:title="..."/>         <item             android:id="@+id/..."             android:icon="@android:drawable/..."             android:title="..."/>         <item             android:id="@+id/..."             android:icon="@android:drawable/..."             android:title="..."/>     </group>      <item android:title="social">         <menu>             <item                 android:id="@+id/..."                 android:icon="@android:drawable/..."                 android:title="..."/>             <item                 android:id="@+id/..."                 android:icon="@android:drawable/..."                 android:title="..."/>         </menu>     </item>  </menu>

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