title: replace LinearLayout with CoordinatorLayout
body: <p>Hi I'm trying to build a material app and my app xml file is something like this :</p>
  
  <pre><code>&lt;android.support.v4.widget.DrawerLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:id="@+id/my_drawer_layout"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:fitsSystemWindows="true"&gt;
  &lt;LinearLayout
      android:id="@+id/coordinatorLayout"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical"&gt;
  
      &lt;include layout="@layout/toolbar" /&gt;
      &lt;android.support.v4.view.ViewPager
          android:id="@+id/viewpager"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:layout_below="@+id/tabs" /&gt;
  
  
  
  
  &lt;/LinearLayout&gt;
  
  &lt;include layout="@layout/fab_layout"&gt;&lt;/include&gt;
      &lt;android.support.design.widget.NavigationView
          android:id="@+id/navigation"
          android:layout_width="wrap_content"
          android:layout_height="match_parent"
          android:layout_gravity="start"
          app:headerLayout="@layout/nav_header"
          app:itemIconTint="@color/nav_item_icon_tint_color"
          app:itemTextColor="@color/nav_item_text_color"
          app:menu="@menu/navigation_drawer_items" /&gt;
  
  
  &lt;/android.support.v4.widget.DrawerLayout&gt;
  </code></pre>
  
  <p>when i change my linear layout to </p>
  
  <pre><code>android.support.design.widget.CoordinatorLayout
  </code></pre>
  
  <p>my fragments that were shown in tabs are not shown
  i cant figureout why?</p>