title: NavigationView with ExpandableListView not scrolling
body: <p>I have a problem within my <code>NavigationView</code>. </p>
  
  <p>I created the view from the standard forms in Android Studio and then changed it so that it looks as i want , but i have 2 problems. </p>
  
  <p>While working on it i saw that i cannot use the standard menu items because i need custom layouts in my menu items. So i implemented that as <code>ExpandableListView</code>. </p>
  
  <ul>
  <li>When i expand the <code>ExpandableListView</code> (quite standard with own
  adapter) the image blow is overlapping my list items.</li>
  <li>The second issue is that if i expand all, but not all child are shown
  and the scrolling doesn't work.</li>
  </ul>
  
  <p>Does someone have a hint how i can accomplish this ? </p>
  
  <p><strong>Here's my code:</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;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"
      android:fitsSystemWindows="true"
      tools:openDrawer="start"&gt;
  
      &lt;include
          layout="@layout/app_bar_dash_board"
          android:layout_width="match_parent"
          android:layout_height="match_parent" /&gt;
  
  
      &lt;android.support.design.widget.NavigationView
          android:id="@+id/nav_view"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_gravity="start"
  
          app:headerLayout="@layout/nav_header_dash_board"&gt;
          &lt;!--app:menu="@menu/activity_dash_board_drawer"&gt;--&gt;
  
  
  
          &lt;LinearLayout
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:orientation="vertical"&gt;
  
  
              &lt;ExpandableListView
                  android:id="@+id/navigationmenu"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_marginTop="192dp"
                  android:background="@android:color/white"
                  android:groupIndicator="@null"
                  android:soundEffectsEnabled="false"&gt;
  
              &lt;/ExpandableListView&gt;
  
          &lt;/LinearLayout&gt;
  
          &lt;ImageView
              android:id="@+id/img_logo"
              android:layout_width="200dp"
              android:layout_height="200dp"
              android:layout_gravity="bottom|center"
              android:contentDescription="@string/its_just_a_logo"
              app:srcCompat="@drawable/logo" /&gt;
  
      &lt;/android.support.design.widget.NavigationView&gt;
  
  
  &lt;/android.support.v4.widget.DrawerLayout&gt;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/pyhT4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pyhT4.png" alt="Picture of The Navigationview with some Sample items and expanded last group"></a></p>