title: how to remove double Tool/Actionbar?
body: <p>i don´t know why this second Toolbar appears... </p>
  
  <p>I have attached my xml files for the Activit "ListActivity".</p>
  
  <p>After deleting one line in the XML the doublebar were gone in the Deign Preview in Android Studio, but when i run the App the second bar appears still...</p>
  
  <p>how to remove it?</p>
  
  <p><a href="https://i.stack.imgur.com/UieI3.png" rel="noreferrer"><img src="https://i.stack.imgur.com/UieI3.png" alt="enter image description here"></a>
  <strong>activity_list.xml</strong></p>
  
  <pre><code>&lt;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="ibas.locatixteamviewer.ListActivity"&gt;
  
  &lt;android.support.design.widget.AppBarLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:theme="@style/AppTheme.AppBarOverlay"&gt;
  
      &lt;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" /&gt;
  
  &lt;/android.support.design.widget.AppBarLayout&gt;
  
  &lt;include layout="@layout/content_list" /&gt;
  </code></pre>
  
  <p></p>
  
  <p><strong>content_list.xml</strong></p>
  
  <pre><code>&lt;RelativeLayout 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_list"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:paddingBottom="@dimen/activity_vertical_margin"
  android:paddingLeft="@dimen/activity_horizontal_margin"
  android:paddingRight="@dimen/activity_horizontal_margin"
  android:paddingTop="@dimen/activity_vertical_margin"
  app:layout_behavior="@string/appbar_scrolling_view_behavior"&gt;
  
  &lt;android.support.v4.widget.SwipeRefreshLayout
      android:id="@+id/swipeRefreshLayout"
      android:layout_width="match_parent"
      android:layout_height="match_parent"&gt;
  
      &lt;android.support.v7.widget.RecyclerView
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:layout_centerVertical="true"
          android:layout_centerHorizontal="true"
          android:id="@+id/itemRecyclerView" /&gt;
  
  &lt;/android.support.v4.widget.SwipeRefreshLayout&gt;
  </code></pre>
  
  <p></p>
  
  <p>Thanks for Help!</p>