title: Prevent layouts from overlapping
body: <p>I am including 2 layouts on my activity xml, now I want the second layout to not to overlap the first one but I do not really manage to do it....</p>
  
  <p>Attached is my xml. How can I achieve this?</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
      android:id="@+id/header"
      layout="@layout/app_bar_yout"
      android:layout_width="match_parent"
      android:layout_height="match_parent" /&gt;
  
  &lt;include layout="@layout/content_youtube"
      android:layout_above="@id/header"
      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="match_parent"
      android:layout_gravity="start"
      android:fitsSystemWindows="true"
      app:headerLayout="@layout/nav_header_main"
      app:menu="@menu/activity_main_drawer" /&gt;
  </code></pre>
  
  <p></p>
  
  <p>Also my 2 included layouts xml's</p>
  
  <p>app_bar_yout</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;&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="com.mlopezitsolutions.blabla.MainActivity"&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;android.support.design.widget.FloatingActionButton
      android:id="@+id/fab"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="bottom|end"
      android:layout_margin="@dimen/fab_margin"
      android:src="@android:drawable/ic_dialog_email" /&gt;
  </code></pre>
  
  <p></p>
  
  <p>content_youtube</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;&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: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"
  tools:context="com.mlopezitsolutions.blabla.MainActivity"&gt;
  
  
  &lt;WebView
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:id="@+id/webView"
      android:layout_alignParentLeft="true"
      android:layout_alignParentStart="true"
      android:layout_alignParentBottom="true"
      android:layout_alignParentRight="true"
      android:layout_alignParentEnd="true" /&gt;
  </code></pre>
  
  <p></p>