title: Preview not Showing in Android 3.0 Canary
body: <p>I have started using Latest Android Studio 3.0 but I am having a problem with Preview. It's not showing Preview in Preview Tab.
  Here is what I have done</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;layout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"&gt;
  
      &lt;ScrollView
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:background="@color/white"&gt;
  
          &lt;RelativeLayout
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:background="@color/white"&gt;
  
              &lt;include
                  android:id="@+id/activePlanCard"
                  layout="@layout/layout_item_activated_plan" /&gt;
  
              &lt;TextView
                  android:id="@+id/DashView"
                  android:layout_width="match_parent"
                  android:layout_height="10dp"
                  android:layout_below="@id/activePlanCard"
                  android:background="@drawable/drw_dash_line" /&gt;
  
              &lt;TextView
                  android:id="@+id/provideAddress"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_below="@id/DashView"
                  android:layout_margin="10dp"
                  android:text="Provide Address Detail :" /&gt;
        &lt;/RelativeLayout&gt;
      &lt;/ScrollView&gt;
  &lt;/layout&gt;
  </code></pre>
  
  <p>Your assistance in this matter will be greatly appreciated</p>
  
  <p>Thanks..</p>
  
  <p><img src="https://i.stack.imgur.com/rNiFt.png" alt="Here I&#39;ve attached preview ScreenShort "></p>