title: Constraint Layout textview width set to 0dp is not showing
body: <p>I'm using an android intro book to set up a Constraint Layout which i think I've done correctly. The preview looks perfect, but when I run it the textviews don't show up, only the image view.</p>
  
  <p>If I change the textviews' widths to "wrap_content" they show up but the format is wrong. This leads me to believe the problem is that the width is to "0dp". I don't understand why this is happening, my xml is identical to the books'. Any feedback for a beginner would be appreciated.</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:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:orientation="vertical"
  tools:layout_editor_absoluteX="0dp"
  tools:layout_editor_absoluteY="81dp"&gt;
  
  &lt;TextView
      android:id="@+id/crime_title"
      android:layout_width="0dp"
      android:layout_height="wrap_content"
      android:layout_marginLeft="16dp"
      android:layout_marginRight="8dp"
      android:layout_marginTop="8dp"
      android:text="Crime Title"
      app:layout_constraintHorizontal_bias="0.0"
      app:layout_constraintLeft_toLeftOf="parent"
      app:layout_constraintRight_toLeftOf="@+id/imageView"
      app:layout_constraintTop_toTopOf="parent"/&gt;
  
  &lt;TextView
      android:id="@+id/crime_date"
      android:layout_width="0dp"
      android:layout_height="wrap_content"
      android:layout_marginBottom="8dp"
      android:layout_marginLeft="16dp"
      android:layout_marginRight="8dp"
      android:layout_marginTop="8dp"
      android:text="Crime Date"
      app:layout_constraintBottom_toBottomOf="parent"
      app:layout_constraintHorizontal_bias="0.0"
      app:layout_constraintLeft_toLeftOf="parent"
      app:layout_constraintRight_toLeftOf="@+id/imageView"
      app:layout_constraintTop_toBottomOf="@+id/crime_title"/&gt;
  
  &lt;ImageView
      android:id="@+id/imageView"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      app:srcCompat="@drawable/ic_solved"
      app:layout_constraintTop_toTopOf="parent"
      android:layout_marginTop="16dp"
      android:layout_marginRight="16dp"
      app:layout_constraintRight_toRightOf="parent"
      app:layout_constraintBottom_toBottomOf="parent"
      android:layout_marginBottom="16dp"/&gt;
  
  &lt;/android.support.constraint.ConstraintLayout&gt;
  </code></pre>