title: Android views never becoming invisible
body: <p>I'm trying to make some of my views invisibe. Here's the XML code:</p>
  
  <pre><code>
  &lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.constraint.ConstraintLayout
          xmlns:android="http://schemas.android.com/apk/res/android"
          xmlns:tools="http://schemas.android.com/tools"
          xmlns:app="http://schemas.android.com/apk/res-auto"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          tools:context=".MainActivity"&gt;
  
  
      &lt;Button
              android:text="See More Like This"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:id="@+id/recommender"
              tools:visibility="invisible"
              android:layout_marginEnd="24dp" android:layout_marginRight="24dp" android:layout_marginBottom="20dp"
              app:layout_constraintEnd_toEndOf="parent" app:layout_constraintBottom_toTopOf="@+id/imageView"/&gt;
      &lt;TextView
              android:text="https://www.google.com"
              android:layout_width="169dp"
              android:layout_height="50dp"
              android:autoLink="web"
              android:linksClickable="true"
              android:id="@+id/urlDisplay"
              tools:visibility="invisible"
              app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent"
              android:layout_marginLeft="24dp" android:layout_marginTop="101dp" android:layout_marginStart="24dp"/&gt;
  
      &lt;TextView
              android:text="TextView"
              android:layout_width="0dp"
              android:layout_height="59dp"
              android:id="@+id/comicTitle" tools:visibility="invisible"
              android:layout_marginTop="21dp" android:layout_marginBottom="21dp" app:layout_constraintEnd_toEndOf="parent"
              app:layout_constraintBottom_toTopOf="@+id/urlDisplay" app:layout_constraintTop_toTopOf="parent"
              app:layout_constraintStart_toStartOf="parent" android:layout_marginLeft="40dp"
              android:layout_marginStart="40dp" android:layout_marginEnd="40dp" android:layout_marginRight="40dp"/&gt;
  
  &lt;/android.support.constraint.ConstraintLayout&gt;
  
  </code></pre>
  
  <p>There is no kotlin code except for the boilerplate. When I start up the app, all of my views are visible. I don't understand how this is happening, given that I've explicitly set them to be invisible in xml. </p>
  
  <p>How can I make them invisible?</p>