title: Layout Preview showing blank screen with Coordinator layout in Android Studio 3.0
body: <p>This is layout design code when I open the layout preview page grey android screen shows only (android...CoordinatorLayout) and nothing is showing on the screen. How can I solve this problem, I want to show the layout design on Layout Preview Screen.</p>
  <pre><code>&lt;android.support.design.widget.CoordinatorLayout
  xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
  xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;
  xmlns:tools=&quot;http://schemas.android.com/tools&quot;
  android:layout_width=&quot;match_parent&quot;
  android:layout_height=&quot;match_parent&quot;
  android:fitsSystemWindows=&quot;true&quot;
  tools:context=&quot;.activity.AddDietActivity&quot;&gt;
  
  &lt;android.support.design.widget.AppBarLayout
      android:layout_width=&quot;match_parent&quot;
      android:layout_height=&quot;wrap_content&quot;
      android:theme=&quot;@style/AppTheme.AppBarOverlay&quot;&gt;
  
      &lt;android.support.v7.widget.Toolbar
          android:id=&quot;@+id/toolbar&quot;
          android:layout_width=&quot;match_parent&quot;
          android:layout_height=&quot;?attr/actionBarSize&quot;
          android:gravity=&quot;center&quot;
          app:popupTheme=&quot;@style/AppTheme.PopupOverlay&quot;
          android:background=&quot;@drawable/menubar&quot;&gt;
  
          &lt;TextView
              android:id=&quot;@+id/tv_title&quot;
              android:layout_width=&quot;wrap_content&quot;
              android:layout_height=&quot;wrap_content&quot;
              android:layout_gravity=&quot;center&quot;
              android:textStyle=&quot;bold&quot;
              android:textSize=&quot;18dp&quot;/&gt;
  
          &lt;TextView
              android:id=&quot;@+id/submitBtn&quot;
              android:layout_width=&quot;wrap_content&quot;
              android:layout_height=&quot;wrap_content&quot;
              android:layout_centerHorizontal=&quot;true&quot;
              android:layout_gravity=&quot;end&quot;
              android:layout_margin=&quot;10dp&quot;
              android:onClick=&quot;clickToAddDiet&quot;
              android:text=&quot;Save&quot;
              android:textSize=&quot;18sp&quot;
              android:textColor=&quot;#fff&quot;/&gt;
      &lt;/android.support.v7.widget.Toolbar&gt;
  
  &lt;/android.support.design.widget.AppBarLayout&gt;
  
  &lt;include layout=&quot;@layout/content_add_diet&quot; /&gt;
  
  &lt;/android.support.design.widget.CoordinatorLayout&gt;
  </code></pre>