title: Ripple effect using itemBackground on NavigationView
body: <p>I wonder if anyone is having problems when redefining the background of the items on a NavigationView with <code>app:itemBackground"</code>? I get the behavior shown on the screenshot, no matter what item I press the last item shows the ripple instead.</p>
  
  <p>Here is my <code>drawer_menu.xml</code>:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;menu xmlns:android="http://schemas.android.com/apk/res/android"&gt;
  
      &lt;group android:checkableBehavior="single" android:id="@+id/first_group"&gt;
          &lt;item
              android:id="@+id/nav_home"
              android:icon="@drawable/ic_home"
              android:title="@string/nav_home" /&gt;
      &lt;/group&gt;
  
      &lt;group android:id="@+id/second_group"&gt;
          &lt;item
              android:id="@+id/nav_settings"
              android:title="@string/nav_settings" /&gt;
          &lt;item
              android:id="@+id/nav_about"
              android:title="@string/nav_about" /&gt;
          &lt;item
              android:id="@+id/nav_logout"
              android:title="@string/nav_logout" /&gt;
      &lt;/group&gt;
  
  &lt;/menu&gt;
  </code></pre>
  
  <p>My <code>my_ripple.xml</code>:</p>
  
  <pre><code>&lt;ripple xmlns:android="http://schemas.android.com/apk/res/android"
          android:color="#ffff0000"&gt;
      &lt;item
          android:id="@android:id/mask"
          android:drawable="@android:color/white" /&gt;
  &lt;/ripple&gt;
  </code></pre>
  
  <p>My NavigationView:</p>
  
  <pre><code>&lt;android.support.design.widget.NavigationView
      android:id="@+id/navigation_view"
      android:layout_width="wrap_content"
      android:layout_height="match_parent"
      android:layout_gravity="start"
      android:background="@android:color/white"
      app:headerLayout="@layout/drawer_header"
      app:itemBackground="@drawable/my_ripple"
      app:itemIconTint="@color/drawer_item"
      app:itemTextColor="@color/drawer_item"
      app:menu="@menu/drawer_menu" /&gt;
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/5ZkRh.png" alt="ripple fail"></p>